Abstract Seeking an advanced cathode is a key to develop lithium ion battery. Here, a self-supporting and high-capacity FeS@C cathode is prepared by the chemical etching, the electrodeposition of carbon precursor and the high temperature sulfidation. Owing to the confinement of carbon layer for particle growth and its excellent conductivity, the FeS@C nanocomposite is generated and shows an elevated electrochemical kinetic behavior compared to the bulk FeS. Besides, the carbon layer improves the volume effect during lithiation and delithiation process. Thus, the optimized electrode exhibits a high reversible discharge capacity of 2.58 mAh cm−2 at 0.2 mA cm−2 and a long cyclic stability (2.03 mAh cm−2 after 200 cycles at 0.8 mA cm−2).

中文翻译：

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用于锂离子电池自支撑和高容量阴极的多功能碳约束 FeS 纳米粒子

摘要 寻求先进的正极是发展锂离子电池的关键。在这里，通过化学蚀刻、碳前驱体的电沉积和高温硫化制备了自支撑和高容量的 FeS@C 正极。由于碳层对颗粒生长的限制及其优异的导电性，生成了 FeS@C 纳米复合材料，与块状 FeS 相比，显示出更高的电化学动力学行为。此外，碳层改善了锂化和脱锂过程中的体积效应。因此，优化后的电极在 0.2 mA cm-2 下具有 2.58 mAh cm-2 的高可逆放电容量和长循环稳定性（在 0.8 mA cm-2 下循环 200 次后为 2.03 mAh cm-2）。