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Lithiophilic Mo2C Clusters‐Embedded Carbon Nanofibers for High Energy Density Lithium Metal Batteries

Advanced Functional Materials(2023)SCI 1区

Nanjing Univ Aeronaut & Astronaut | Suzhou Univ Sci & Technol

Cited 11|Views46
Abstract
Lithium metal anodes are widely regarded as the ideal candidate for the next generation of high-energy-density lithium batteries. Here, a 3D host made of lithiophilic Mo2C clusters-embedded carbon nanofibers (Mo2C@CNF) is developed. The uniformly dispersed clusters and large specific surface areas of Mo2C@CNF provide numerous nucleation sites for lithium deposition. Mo2C clusters exhibit ultralow nucleation overpotential compared to MoO2, which is also supported by density functional theory calculations. Furthermore, the transition metal element serves as a catalyst for the formation of a stable and robust solid electrolyte interphase layer containing LiF on Mo2C@CNF, effectively mitigating the occurrence of dead lithium and enhancing the Coulombic efficiency during prolonged operation. As a result, the Mo2C@CNF composite delivers superior electrochemical performance (>1600 h) at 1 mA cm(-2) and lower nucleation overpotential (13 mV) for lithium plating. The Li/Mo2C@CNF anode coupled with the commercial LiFePO4 cathode exhibits excellent cycling stability (300 cycles at 1 C) and high rate capability at low N/P ratios.
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dendrite-free anodes,electrospinning,lithium metal batteries,Mo2C clusters
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要点】:该研究开发了一种由亲锂的Mo2C簇嵌入的石墨纳米纤维三维载体,用于高能量密度锂金属电池,其创新点在于Mo2C簇具有超低成核过电位,并且通过过渡金属元素催化形成稳定的固态电解质界面层,显著降低了锂成核过电位并提高了库仑效率。

方法】:通过将Mo2C簇均匀分散于碳纳米纤维中制备了Mo2C@CNF复合材料。

实验】:使用该复合材料作为负极与商用LiFePO4作为正极组装电池,结果显示在1 mA cm(-2)下具有超过1600小时的优异电化学性能,且成核过电位仅为13 mV,在300个循环中保持了良好的循环稳定性和高率性能。