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Multi-functional Bilayer Carbon Structures with Micrometer-Level Physical Encapsulation As a Flexible Cathode Host for High-Performance Lithium-Sulfur Batteries

Chemical Engineering Journal(2023)SCI 1区

Fuzhou Univ | Nanyang Technol Univ

Cited 48|Views31
Abstract
With the exceptional merits of high energy density, low cost, and environmental friendliness, lithium-sulfur batteries are considered to be one of the most promising next-generation flexible rechargeable batteries. How-ever, the notorious "shuttle effect " has seriously hindered their practical applications. Herein, a strategy for designing multi-functional bilayer carbon structures is proposed, specifically, by employing a micrometer-thick graphene nanoflowers (GF) layer to encapsulate a micrometer-scale hybrid network skeleton composed of metallic Co and carbon nanotubes (CNT) as a flexible sulfur cathode host (Co/CNT@GF). Beneficial from the merits of chemical adsorption, electrocatalysis and volume expansion mitigation from the internal skeleton as well as the micrometer-level physical domain confinement by the external GF layer, the developed host could chemically trap, electrochemically catalyze, physically block and storage the lithium polysulfides. Due to the synergistic effect of these functions, the Co/CNT@GF-S delivers a superior discharge capacity of 799 mAh g(-1) with a decay rate as low as 0.08 % per cycle after 400 cycles at 1 C. Even at a high sulfur loading of 8.16 mg cm(-2), the average discharge capacity is as high as 5.05 mAh cm(-2) in 100 cycles. This work does not only contribute to the rational design of multi-functional bilayer structures but also offers a novel design method for the commercialization of flexible lithium-sulfur batteries with high-energy-density.
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Key words
Metal-organic frameworks,Graphene nanoflower,Plasma -enhanced chemical vapor deposition,Synergistic effects,Lithium polysulfides,Li -S batteries
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要点】:本研究开发了一种具有微米级物理封装的双层碳结构,作为高性能锂硫电池的柔性阴极宿主,通过内部钴和碳纳米管骨架的化学吸附以及外部石墨烯纳米花层的微米级物理限制,实现了多硫化物的有效物理阻挡、存储和化学锚定。

方法】:通过化学吸附和物理限制相结合的方法制备了双层碳结构。

实验】:使用钴和碳纳米管作为内部吸附剂,石墨烯纳米花作为外部物理封装层,有效地提升了锂硫电池性能。