Zinc-ion capacitors (ZICs) combine the high power capability of supercapacitors with the high capacity of zinc-ion batteries, making them highly attractive for practical energy-storage applications. However, the pore architecture of conventional porous carbon cathodes is often poorly matched to hydrated zinc-ion storage, where excessively large pores lower spatial utilization, while insufficiently accessible small pores hinder ion transport and interfacial charge accumulation. Herein, inspired by the directional ion-filtering function of cell membranes, we develop a ternary-blending hybrid-derived one-step carbonization/activation strategy to fabricate nitrogen-doped flexible carbon nanofibers (NCNFs) with tunable hierarchical porosity for zinc-ion storage. This strategy constructs abundant micropores together with well-developed mesoporous ion-transport channels, forming a function-matched hierarchical pore architecture. Benefiting from this synergistic pore configuration, the optimized NCNF20-700 electrode delivers a high specific capacity of 231.2 mAh g−1 at 0.1 A g−1, a cathode-based energy density of 158.7 Wh kg−1, with 84.3% capacity retention after 150000 cycles at 10 A g−1. In situ electrochemical impedance spectroscopy, together with ex situ X-ray diffraction and X-ray photoelectron spectroscopy, reveals that the zinc-ion storage behavior is governed by the dynamic evolution of zinc-ion interactions with pyridinic-N and surface carbonyl groups. This work establishes a simple yet effective strategy for engineering function-oriented pore structures, clarifies the synergistic role of hierarchical pores in coupling ion transport and desolvation chemistry, and provides a general route toward flexible ZIC cathodes with high energy density, high power density, and ultralong lifespan.

Aqueous zinc-iodine batteries are promising candidates for grid-scale energy storage, but their practical application is hindered by low areal-capacity and shuttling of polar polyiodides on positive-electrode side. Herein, a high-areal-capacity iodine electrode (up to 14 mAh cm−2) with mechanical flexibility is developed through an integrated thick electrode processing technology, which synergistically combines enhanced ion transport with a polyiodide-immobilization hydrogelation interphase. A viscoelastic polyamide thermoplastic elastomer network is in situ formed throughout electrode bulk via a rapid phase inversion method, acting as structural skeleton to preserve transient slurry-level uniformity, concurrently ensuring interconnected ion transport network and mechanical robustness even under high thickness (>2 mm). Moreover, the polyamide interphase, rich in functional amide groups, demonstrates strong binding affinity for polyiodides, effectively immobilizing them within the hydrogelation layer and facilitating their reutilization during redox cycling. Consequently, the high-loading flexible electrode (70 mg cm−2) delivers an average areal-capacity of 11.5 mAh cm−2 at 0.62 A g−1 with over 1600 cycles. Notably, the integrated electrode can be directly used to assemble Ah-level single-layer pouch cells (~1.6 Ah), demonstrating stable operation over 1200 cycles and validating practical applications in powering wearable electronics and high-power devices, thereby paving the way toward high-energy-density zinc-iodine batteries. Aqueous zinc-iodine batteries face low areal capacity and polyiodide shuttling. Here, authors develop an integrated thick iodine electrode with a polyamide binder that enables flexible, robust electrodes with polyiodide immobilization.

Aqueous zinc-ion batteries present several advantages, including high safety and low cost. However, severe dendrite growth and side reactions at the zinc anode significantly impede their cycle life and efficiency. This study proposes a zinc deposition regulation strategy based on a synergistic "chelation-relay" mechanism achieved by constructing a phthalocyanine functional layer on the surface of a cellulose separator. The phthalocyanine layer, which is rich in nitrogen coordination centers, effectively chelates Zn2+, reshaping the electrode/electrolyte interface structure and inhibiting side reactions. Its macrocyclic conjugated architecture functions as an "ion relay", facilitating reversible storage and providing ordered migration channels for Zn2+, thereby alleviating concentration polarization and promoting uniform deposition. COMSOL simulation results demonstrate that this functional layer can homogenize the interfacial electric field and Zn2+ flux, thereby suppressing the "tip effect" associated with dendrite formation. Consequently, stable zinc deposition and stripping over 1000 cycles under conditions of 1 mA cm-2 and 1 mAh cm-2 yield an average coulombic efficiency of 99.1%. Furthermore, the Zn/I2 full cell exhibits a capacity retention rate of 98.83% after 10 000 cycles at a discharge rate of 1 A g-1. These findings underscore the potential of phthalocyanine to regulate zinc deposition, contributing to the development of high-performance aqueous zinc-ion batteries.

Heterojunction engineering provides an effective means to enhance the gas sensing performance of metal oxide semiconductors through band structure optimization and interface effects. However, current research on heterojunction engineering primarily centers on binary heterojunctions (including p-n, n-n, and p-p junctions), while studies concerning ternary or multicomponent metal oxide heterojunctions for gas sensing remain exceedingly limited and challenging. Herein, a ternary NiO@In2O3/ZnO porous heterojunction array is fabricated in-situ on commercial alumina sensing substrate via a facile liquid-phase chemical reaction combined with topotactic transformation. The heterojunction array enables highly efficient room temperature ammonia detection under visible light illumination, exhibiting a high response of 263% towards 100 ppm ammonia, a fast recovery of 21 s, and a low detection limit of 0.483 ppm. Moreover, it displays excellent selectivity, strong resistance to humidity interference, and stable long-term performance. First-principles calculations integrated with spectroscopic characterization suggest that the construction of ternary NiO@In2O3/ZnO heterojunction with multi-phase interfaces greatly enhances the ammonia surface adsorption and promotes the interfacial charge transfer efficiency. Interestingly, there exists a notable positive correlation between the d-band center position of sensing materials and their adsorption behavior as well as sensing performance. This work not only achieves a multi-dimensional enhancement in the room temperature ammonia sensing performance of metal oxide semiconductors through ternary heterojunction construction, porous array design and external light field activation, but also significantly enhances the gas sensing mechanism of ternary heterojunctions at atomic and electronic scale, offering new insights for the rational designing of high-performance resistive gas sensors via multi-phase interfaces.

Polymer film capacitors are widely used in electronic power systems due to their high power density, good self-healing ability, and ease of large-scale production. With the rapid progress of new energy vehicles, aerospace and other fields, there is an urgent need for polymer film capacitors that can work stably under extreme conditions such as high temperature and high electric field. Under the synergistic effect of multiple physical fields such as thermal and electric fields, the electrical conductivity loss of traditional polymer films significantly increases, resulting in a sharp decline in their insulation performance and energy storage characteristics. To overcome this limitation, this study introduces different types and contents of cycloaliphatic structures into polyimide to regulate the π-π conjugation effect within its chain. Then, by controlling the reaction kinetics to retain the polar groups in polyimide, the synergistic effect of cycloaliphatic structure and polar groups is achieved to enhance the energy storage performance of the polymer at high temperatures. Compared with traditional aromatic materials, these materials exhibit significantly improved discharge energy density (Ud) and efficiency (η) under high temperature conditions. It is worth noting that the semi cyclic PI copolymer achieves an excellent energy density of 6.57 J/cm3 and an efficiency of 88.68 % at 150 ℃; it achieves an excellent energy density of 4.79 J/cm3 and an efficiency of 82 % at 200 ℃. This enhanced performance is attributed to the polar groups providing controllable polarization ability, increasing dielectric constant, and the cycloaliphatic structure widening the bandgap, suppressing charge transport, and ensuring high breakdown strength. Thus, by finely controlling the molecular chain configuration and aggregation state, the traditional trade-off relationship between dielectric constant and breakdown strength can be broken through, achieving directional design of high-performance insulation materials.

Hard carbon is the most commercially viable anode for sodium-ion batteries, with low operating potential, high reversible capacity, abundant raw materials and low manufacturing cost. However, its intrinsic structural disorder, characterized by randomly stacked turbostratic graphene layers, nanopores and amorphous regions, has sparked long-standing debates on fundamental sodium storage mechanisms, significantly impeding rational electrode design and industrial translation. This review overviews sodium storage processes in hard carbon, analyzes synergistic contributions of intercalation, pore filling and surface adsorption, and establishes microstructural-electrochemical performance correlations. It focuses on four mainstream modification strategies: Precursor engineering, pore structure regulation, heteroatom doping and interface engineering, elucidating their enhancement mechanisms and discussing inherent limitations and trade-offs. Finally, it outlines key challenges and future directions, providing critical theoretical and technical guidance for next-generation hard carbon anodes and practical sodium-ion battery deployment.

In the context of carbon neutrality, collaborative "power generation-energy storage" system is an inevitable requirement for promoting the green transformation of energy structure. However, the design of related key materials still faces severe challenges. Here, a strategy for the combined use of energy materials is proposed, in which carbon materials derived from discarded bamboo are simultaneously applied to direct carbon solid oxide fuel cell (DC-SOFC) and sodium-ion battery (SIB), forming a resource complementary energy loop. By comparing rapid Joule heating with traditional tube furnace heating processes, the system elucidates the regulating mechanisms of the carbon material microstructure and their strengthening effect on the electrochemical performance. When the optimized carbon material is used as DC-SOFC fuel, a maximum power density of 515.3 mW cm(-2) and 1570 mAh of electricity can be achieved; As an SIB anode, it exhibits a reversible capacity of 327.6 mAh g(-1) with an initial Coulombic efficiency of 90.4%. This work not only realizes the high-value utilization of waste biomass, but also provides feasible material basis and technical ideas for building future integrated and clean energy systems.

Bituminous coal, characterized by an optimal degree of metamorphism, volatile content, high aromaticity, and crosslinking potential, serves as an excellent precursor for the synthesis of hard carbon (HC). However, the ordered microcrystalline structure of derived HC increases the energy barrier for sodium-ion insertion, impairs diffusion kinetics, and restricts the localized storage of quasi-metallic sodium clusters, thereby significantly diminishing performance. Simple pyrolysis of resource-abundant while high aromatic bituminous coal induces highly graphitized carbon, exhibiting unsuitable microstructure for sodium storage. Herein, for the first time, the condensation reaction kinetics during the thermal treatment of bituminous coal were regulated, and the strong crosslinking network was optimized in-situ during the curing stage, establishing a "disordered-ordered" equilibrium state within the microcrystalline structure of the derived HC. The randomly arranged graphitic-like microcrystals facilitate sodium-ion adsorption, while the ordered graphitic domains provide efficient ion insertion sites and electronic conduction pathways. The coexistence of disordered and ordered domains generates structural mismatches at their interfaces, inducing carbon layer distortion that forms closed pores, which subsequently accommodate quasi-metallic sodium clusters. This balanced microstructural design enhances the sodium storage capacity of the bituminous coal-based HC anode from 225.6 mAh g-1 to 271.2 mAh g-1, achieving an initial Coulombic efficiency (ICE) of 85.7%.

ABSTRACT Silicon (Si) is a promising anode material for next‐generation lithium‐ion batteries owing to its ultrahigh theoretical capacity. However, severe stress accumulation induced by large volume changes during lithiation and delithiation leads to mechanical fracture, interfacial instability, and electrode structural degradation, which critically limits its practical application. Although extensive strategies have been proposed to improve the electrochemical performance of Si‐based anodes, stress‐related degradation is often discussed in a fragmented manner, and a systematic understanding remains insufficient. In this review, stress regulation is treated as a unifying framework to analyze the failure mechanisms and mitigation strategies of Si‐based anodes across multiple length scales. The origins and evolution of mechanical stress, interfacial stress, and electrode‐level structural stress are systematically summarized. Recent progress in dimensionally engineered Si architectures, ranging from zero‐dimensional nanoparticles to three‐dimensional porous frameworks, is critically reviewed to elucidate the roles of size‐dependent behavior, geometric confinement, and hierarchical structural design in stress accommodation. In addition, electrode‐level strategies, including engineered architectures, functional binders, and electrolyte regulation, are discussed with emphasis on their synergistic effects on structural stability and electrochemical durability. This work provides a multidimensional framework to guide the rational design of durable, high‐energy‐density Si‐based anodes.

ABSTRACT In the fields of automotive electronics, power electronics, and aerospace, environmental conditions are often extremely harsh, particularly for materials that must endure high temperatures, high power and require high stability. The degradation of capacitance performance in polymer dielectrics under high electric fields and elevated temperatures is primarily attributed to the decrease in breakdown strength. To address this, a synergistic strategy combining molecular traps with adjustments to the conjugated structure has been developed to enhance the high‐temperature breakdown strength of polymer dielectrics. To address this, we developed a synergistic strategy combining molecular traps with conjugated structure modulation. Experimental and theoretical analyses reveal that polar groups induce deep electron traps via electrostatic interactions, whereas long‐chain flexible groups disrupt the conjugation, which alters charge transport mechanisms. Between aromatic rings in the molecular chain, altering the conductivity mechanism. Furthermore, dihedral angle adjustment regulates trap‐hopping distances, enhancing high‐temperature breakdown strength. As a result, the combined effects of electronic traps and conjugated structure optimisation lead to a discharge energy density of 7.87 J/cm 3 at room temperature and 5.99 J/cm 3 at 200°C, which is 60% higher than that of OD–PM. This performance surpasses most current polymer dielectrics. Our work establishes a molecular design framework to advance high‐temperature capacitive energy storage in polyimides, with direct relevance to harsh‐environment applications.

Co-contamination bynitrate-nitrogen (NO3--N)and heavy metals (HMs) can impair biological nitrogen removal. This study investigated whether powdered activated carbon (PAC) derived from coconut shell, applied at a trace dose, could enhance denitrification, manganese oxidation, and metal immobilization by Zoogloea sp. MFQ7 under HM stress. Under the selected conditions of pH 7.0, a carbon-to-nitrogen ratio of 1.5, and an initial Mn(II) concentration of 10.0 mg L-1, strain MFQ7 removed 92.89 % of NO3--N and 89.12 % of Mn(II). Addition of 0.8 mg L-1 PAC increased these removal efficiencies to 97.02 % and 97.11 %, respectively, while nitrite remained below 0.01 mg L-1. Under combined zinc (Zn(II)), copper (Cu(II)), and nickel (Ni(II)) stress, PAC maintained NO3--N and Mn(II) removal efficiencies at 75.93 % and 69.00 %, respectively, and achieved Zn(II), Cu(II), and Ni(II) immobilization efficiencies of 79.22 %, 78.65 %, and 71.34 %, respectively. PAC also increased electron transport system activity to a level 9.66 % above that of the unstressed control and helped preserve a matrix of extracellular polymeric substances (EPS) rich in proteins. Analyses of the solid phase showed that PAC introduced additional carbonaceous interfaces containing oxygen functional groups, while EPS, biogenic Mn precipitates, and metal carbonate phases contributed to metal immobilization. Overall, trace PAC derived from coconut shell alleviated inhibition caused by HMs through a combination of physiological protection and immobilization in the solid phase, supporting its exploratory application as an amendment derived from waste for complex wastewater treatment at the batch scale.

Lithium metal has become an ideal anode for high-energy-density lithium-ion batteries due to its unique theoretical capacity and potential advantages. However, the volume effect, uneven deposition, and dendrite growth of lithium metal can seriously shorten the service life of the battery. A 3D structural design and a lithium-friendly interface are considered effective ways to improve lithium metal negative electrodes. Hence, this article successfully prepared a sponge carbon (SC) scaffold rich in N-sites using melamine as the raw material. Pyridine N and pyrrole N, which can enhance surface activity, are distributed in the SC structure and can serve as lithium nucleation sites to promote the uniform deposition of lithium metal. Compared with hard carbon (HC), SC exhibits significant improvements in polarization potential and cycle life. The deposition overpotential of the SC battery is only 36 mV, and its cycle life is as long as 1800 h, while it maintains a high Coulombic efficiency of over 98%. Even at a high deposition capacity of 10 mAh cm-2, SC can still stably deposit for over 1000 h. In addition, the 3D flexible carbon skeleton of SC provides a large space for buffering the volume expansion of lithium metal, which effectively suppresses the growth of lithium dendrites. The full-cell performance results demonstrate that the SC still retains a capacity retention rate of 98.4% after 200 cycles at 1 C, whereas the capacity retention rate of HC drops to 73.5%. Moreover, the long cycle performance and rate capability of SC full cells are both superior to those of HC full cells. This article improves the reversibility of lithium metal deposition/stripping by constructing a 3D self-doped N-sponge carbon skeleton and provides a reference for the development of long-life lithium metal batteries.

It is greatly challenging to monitor real-time dynamic evolution of pre-catalysts in complicated redox reactions, and there is, therefore, still a lack of profound understanding into their behavior mechanisms. Herein, we reveal a dynamic dual-evolution mechanism of Co-CoO heterostructure catalyst in Li-S batteries through combining a series of in situ characterization techniques. In situ phase transformation of partial CoO into CoS2 couples with synchronous crystal-plane slip, and the crystal-plane slip induced by lattice distortion continuously exposes new active sites. The dynamic dual-evolution of heterostructure catalysts broadens the catalytic selectivity toward sulfur redox reactions, establishes a unique bidirectional catalytic reaction pathway for sulfur conversion, and realizes controllable full-range reaction kinetics manipulation in Li-S batteries. Eventually, Li-S batteries exhibit a low capacity decay of 0.035% per cycle for 1000 cycles at 1.0 C, and multilayered Li-S pouch cells harvest an ultrahigh energy density of 362.7 W h kg-1 even under a high areal loading of 8.33 mg cm-2. This work provides direct atomic-level evidence to real-time dynamic evolution of catalysts, deepens insights into the catalyst evolution mechanism, and inspires new design routes for developing low-cost and high-energy-density Li-S batteries.

The oxygen content in SiOx anodes plays a critical role in the electrochemical performance, yet practical control of oxygen content remains challenging. Here, we report a simple air-assisted mechanochemical route for adjusting the oxygen content in SiOx by controlling the ball milling time. Extended milling simultaneously decreases the crystallinity of SiOx and increases surface Si valence and oxygen enrichment. This structural evolution produces a tunable electrochemical trade-off: the initial capacity and initial Coulombic efficiency (ICE) decrease with milling time, whereas cycling stability improves markedly. In particular, the product after milling 32 h exhibits excellent cycling stability with the discharge capacity of 618.4 mAh g−1 after 100 cycles, exceeding the second-cycle (605.5 mAh g−1).

The principal challenge in optimizing biomass-derived hard carbon (HC) is the concurrent enhancement of specific capacity, cycling durability, and rate performance, as these properties are closely related to the disordered carbon network and abundant pore structure. However, inadequate controllability of morphology, insufficiently regulated pore structures, and the complexity of post-processing modifications hinders the practical application of HC. In this work, a high-temperature and high-pressure expansion pretreatment technique is proposed to regulate the structure of starch precursors, enabling the precise design of ordered graphitic-like microcrystals and closed pores within HC. The optimized starch-based HC displayed remarkable electrochemical efficiency, with a reversible capacity of 332.0 mAh g ^−1 , an initial Coulombic efficiency of 90.4%, and stable cycling over 3000 cycles. Meanwhile, advanced full-cell utilizing Na _4 Fe _3 (PO _4 ) _2 P _2 O _7 cathode achieve stable cycling performance exceeding 1000 cycles, demonstrating outstanding performance. This research innovatively employs a green expansion process to achieve structural regulation of HC, thereby providing an environmentally friendly and economically viable technical pathway for its large-scale production.

The utilization of solid electrolytes as substitutes for flammable liquid electrolytes represents a crucial strategy for enhancing both the safety and energy density of lithium metal batteries. However, the poor solid-solid contact between electrodes/electrolytes and the inherent difficulties of Li dendrite growth have seriously hindered their practical applications. Among the various types of solid electrolytes, polymer electrolytes are highly regarded for their potential high ionic conductivity, good deformability, and wide electrochemical window. In-situ curing technology has been demonstrated to be an effective solution to these problems and shows great application prospects in polymer electrolyte all-solid-state lithium-metal batteries. This paper will provide a comprehensive review of the three primary types of polymerization methods: free radical polymerization, ring-opening metathesis polymerization, and ionic polymerization. The technical principles, research progress, and performance optimization of in-situ polymerized solid state electrolytes will be reviewed, and the review will look forward to the future development of in-situ curing. The emerging challenges faced by the field and the potential opportunities in practical applications will be pointed out. As research progresses and technology advances, in-situ curing technology is poised to reinvigorate the development of all-solid-state batteries, propelling them towards enhanced safety, efficiency, and reliability.

Quasi-solid/solid-state sulfur redox reactions critically determines the electrochemical stability of room-temperature sodium‑sulfur (Na-S) batteries, yet the field still lacks comprehensive and profound understanding of underlying mechanisms. This directly contributes to ambiguous interpretation of fundamental electrochemical principles as well as substantial obstacles to performance breakthroughs and practical applications of Na-S batteries. In this critical review, we comprehensively present deep understanding of quasi-solid/solid-state sulfur redox reactions in Na-S batteries. First of all, the differences of various sulfur redox reaction mechanisms are analyzed with a focus on their formation origins a and behavior characteristics. Following by it, the fundamental principles and methodologies of designing quasi-solid/solid-state sulfur redox reactions are elaborated, especially emphasizing their correlation to materials, electrolytes, and interfaces. Then, we systematically discuss how to kinetically manipulate quasi-solid/solid-state sulfur conversion in Na-S batteries. Finally, reasonable perspectives are offered to guide future development of Na-S batteries.

ABSTRACT The solvent‐separated ion pairs in local high‐concentration electrolytes (LHCE) have a profound influence on rechargeable sulfur‐based batteries yet are always ignored. Herein, tailored solvent‐separated ion pairs are engineered by tuning the diluent ratio in LHCE to boost sulfur redox kinetics in room‐temperature sodium‐sulfur (Na‐S) batteries. The tailored solvent‐separated ion pairs allow the sparingly dissolved polysulfides to enhance localized solid‐liquid‐solid transformation on reactive interfaces, so the LHCE decorated with the solvent‐separated ion pairs preserves the global quasi‐solid‐state mechanism of sulfur while modulating its intrinsic sulfur redox kinetics. Consequently, Na‐S batteries achieve excellent cyclability (fading rate of 0.017% per cycle over 2400 cycles at 1.0C) and outstanding rate performance (564 mA h g−1 at 2.0C), and the pouch cells can deliver an ultrahigh capacity of 912 mA h g−1 at 0.1C. This work highlights the critical role of SSIPs in enabling fast and stable sulfur chemistry for durable and fast‐charging Na‐S batteries.

ABSTRACT Biomass‐derived hard carbon (HC) stands as the leading candidate for the anode in commercial sodium‐ion batteries (SIBs). However, the effect of precursor components on the formation of HC at the molecular level breezing, and the evolution mechanism of microcrystalline carbon remains controversial. In this work, the introduction of the concept of “steric hindrance”, through reducing the steric hindrance to the growth of linear cellulose chains, which can enable the deliberate design of an ordered microcrystalline structure, resulting in significantly enhanced ion diffusion kinetics. Experimental results and molecular dynamics indicate that reduced steric hindrance can decrease the chain rigidity and internal free volume of the precursor, preventing excessive disorder, and promoting the growth of microcrystalline graphite. Additionally, highly crystalline cellulose encourages the creation of closed pores, whereas lignin and hemicellulose impede the graphitization of the carbon layer. The optimized HC anode reveals a high sodium storage capacity of 309.7 mAh/g with a high initial Coulombic efficiency (ICE) of 93.5% at 20 mA/g, excellent cycling stability over 7000 cycles at 400 mA/g. Even at ‐20°C, it still has remarkable electrochemical performance. This study offers fresh insights into the regulation of microcrystalline structures via steric hindrance engineering.

Conversion-type anode materials are of great interest in sodium-ion batteries (SIBs) research, as they offer excellent Na+ accommodation capabilities along with inherent safety features. However, progress in achieving efficient sodium-ion storage has been limited by the intrinsically low electronic conductivity of transition metal sulfides. The incorporation of defect structures effectively increases surface reactivity and facilitates structural transformations during electrochemical processes. Metal-organic frameworks (MOFs), with their exceptionally high specific surface area, offer abundant active sites for sodium-ion storage. In this work, we synthesized carbon-coated Cu1.8Se@C nanospheres via a one-step solid-state method based on MOFs for use as anodes in SIBs. The resulting material features lattice defects that effectively modulate the electronic structure of the metal selenide, facilitating rapid Na+ charge transfer and enhancing electrochemical reaction kinetics. At 1 A g(-1), the Cu1.8Se@C delivers 296.5 mAh g(-1) after 1000 cycles, maintaining 99.26 % of its initial capacity. Under ultra-fast charging at 18 A g(-1) (within 50 s), the material exhibits long-term durability, showing only a slight capacity loss of 0.03 parts per thousand after 2500 cycles. Even at -40 degrees C, the system still retains 122.1 mAh g(-1) after 100 cycles at 0.1 A g(-1), indicating outstanding low-temperature performance. When assembled with Na3V3(PO4)(3) (NVP) as the cathode, the device maintains outstanding long-term performance, showing a minimal capacity loss rate of just 0.0071 % per cycle over 2000 cycles at 2 A g(-1). A series of ex-situ and in-situ characterization techniques confirm the superior electrochemical performance of the material.