Preparation of hard carbon–coated and metal-modified silicon anode materials for lithium-ion batteries

IF 2.4 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2024-10-05 DOI:10.1007/s11581-024-05870-1
Feiyang Chen, Jun Chen, Guojun Xu, Chenxin Jin, Haoqiang Ma, Lijun Wen, Chuanbin Tu, Fugen Sun, Yong Li, Hui Li, Lang Zhou, Zhihao Yue
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引用次数: 0

Abstract

High-capacity silicon anode is one of the ideal anode materials for the next generation, but the volume expansion effect and low conductivity hinder its development. In this study, a simple and low-cost method was employed to prepare micron-sized silicon raw materials. Subsequently, a hard carbon-coated structure was combined with the metal modification method to successfully prepare hard carbon–coated silver-modified silicon particle material. Due to the hard carbon coating structure, Si/Ag@HC materials can effectively alleviate the volume expansion of silicon, and the modification of metallic silver can not only improve the conductivity of silicon, but also further enhance the ability to limit the volume expansion effect. The Si/Ag@HC maintains a specific capacity of 997.05 mAh g−1 after 200 cycles at a current density of 0.5C, and it also shows an excellent rate performance of over 600 mAh g−1 at a current density of 2C.

锂离子电池用硬碳包覆及金属改性硅负极材料的制备
大容量硅阳极是下一代理想的阳极材料之一,但体积膨胀效应和低电导率阻碍了其发展。本研究采用一种简单、低成本的方法制备微米级硅原料。随后,将硬碳包覆结构与金属改性方法相结合,成功制备了硬碳包覆银改性硅颗粒材料。由于硬碳涂层结构,Si/Ag@HC材料可以有效缓解硅的体积膨胀,而金属银的改性不仅可以提高硅的导电性,还可以进一步增强限制体积膨胀效果的能力。在0.5C的电流密度下,Si/Ag@HC在200次循环后保持997.05 mAh g−1的比容量,在2C的电流密度下也表现出超过600 mAh g−1的优异倍率性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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