Rationally engineered anode materials with high specific capacities and rate capability are essential for lithium-ion batteries (LIBs). In this paper, a free-standing anode composed of Co3S4 nanosheets arrays and carbon cloth (abbreviated Co3S4@CC) was fabricated for high performance LIBs. The three-dimensional (3D) porous carbon cloth could not only improve the conductivity but also boost Li[Formula: see text] transfer and increase contact area for reactions. Besides, the porous thin Co3S4 nanosheets possessing strong interaction with carbon cloth by formation of C–S bond and high surface area could facilitate the mitigation of volume expansion and reduction of Li[Formula: see text] diffusion distance, coupling with efficient contact with electrolytes during cycling process. As expected, the freestanding Co3S4@CC anode presents pseudocapacitance-dominated storage behavior with a very high specific capacity of 847[Formula: see text]mAh g[Formula: see text] at 250[Formula: see text]mA g[Formula: see text] after 100 cycles and good rate capability for LIBs. This work provides an approach for designing metal sulfides with high capacities and rate capability for LIBs, especially flexible LIBs.

中文翻译：

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碳布上的 Co3S4 纳米片作为独立阳极，具有改进的赝电容存储，适用于高性能锂离子电池

具有高比容量和倍率能力的合理设计的负极材料对于锂离子电池 (LIB) 至关重要。在本文中，由 Co 组成的独立式阳极3小号4纳米片阵列和碳布（简称 Co3小号4@CC) 是为高性能 LIB 制造的。三维（3D）多孔碳布不仅可以提高导电性，还可以促进锂[公式：见正文]的转移并增加反应的接触面积。此外，多孔薄Co3小号4通过形成C-S键和高表面积与碳布具有强相互作用的纳米片可以促进Li[公式：见文本]扩散距离的减轻和减少，以及在循环过程中与电解质的有效接触。正如预期的那样，独立的 Co3小号4@CC 阳极表现出以赝电容为主的存储行为，在 250[公式：见文本]mA g[公式：见文本] 100 次循环后具有非常高的比容量 847[公式：见文本]mAh g[公式：见文本]和 LIB 的良好速率能力。这项工作为设计具有高容量和倍率能力的金属硫化物提供了一种方法，用于锂离子电池，尤其是柔性锂离子电池。