Cu2SnS3@C纳米复合材料的制备及其电化学储锂性能

IF 3.2 3区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR
Fan Wang , Pengfei Lou , Suqin Chen, Zihao Cha, Xiaoyan Zhang
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引用次数: 0

摘要

Cu2SnS3具有784 mAh g−1的理论比容量和独特的锂存储机制,是锂离子电池的转换型和合金型负极材料。然而,其固有的低导电性和循环过程中明显的体积膨胀对其实际电池性能构成了重大挑战。为了解决这些限制,利用乙二醇作为溶剂,葡萄糖作为碳前驱体,通过一步微波辅助方法合成了Cu2SnS3@C (CTS@C)纳米材料。碳涂层的掺入已被证明可以显著提高材料的导电性,并减轻与锂插入和提取相关的体积膨胀。电化学测试表明CTS@C电极具有优异的电化学性能。具体来说,CTS@C电极的初始放电容量为612.8 mAh g - 1,在500 mA g - 1电流密度下循环500次后保持295.8 mAh g - 1。碳涂层不仅有效增强了电极材料的导电性,而且加快了电化学反应速率,增强了锂离子的扩散速率,从而显著提高了电池的电化学性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Preparation and electrochemical lithium storage properties of Cu2SnS3@C nanocomposites

Preparation and electrochemical lithium storage properties of Cu2SnS3@C nanocomposites
Cu2SnS3, recognized as a conversion and alloy type anode material for lithium-ion batteries, possesses a high theoretical specific capacity of 784 mAh g−1 and exhibits a distinct lithium storage mechanism. However, its intrinsically low electrical conductivity and pronounced volume expansion during cycling pose significant challenges to its practical battery performance. To address these limitations, Cu2SnS3@C (CTS@C) nanomaterials were synthesized by a one-step microwave-assisted method, utilizing ethylene glycol as a solvent and glucose as a carbon precursor. The incorporation of a carbon coating has been demonstrated to markedly improve the conductivity of the material and mitigate the volume expansion associated with lithium insertion and extraction. Electrochemical tests revealed that the CTS@C electrode exhibits superior electrochemical performance. Specifically, the CTS@C electrodes exhibited an initial discharge capacity of 612.8 mAh g−1, with a retention of 295.8 mAh g−1 after 500 cycles at a current density of 500 mA g−1. The carbon coating not only effectively enhances the conductivity of the electrode material, but also accelerates the electrochemical reaction rate, and enhances the diffusion rate of lithium ions, thereby significantly improving the electrochemical performance of the battery.
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来源期刊
Journal of Solid State Chemistry
Journal of Solid State Chemistry 化学-无机化学与核化学
CiteScore
6.00
自引率
9.10%
发文量
848
审稿时长
25 days
期刊介绍: Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.
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