摘要
以白炭黑为基料,通过镁热还原法制备出多孔硅,再将多孔硅与石墨颗粒复合制备出多孔硅碳复合材料。通过XRD、BET和SEM对制备出的材料进行结构形貌表征,结果表明多孔硅材料表面疏松多孔且分布均匀,此结构可以有效缓解硅颗粒的体积膨胀效应;并对硅碳复合材料进行电化学性能测试分析,结果显示镁热还原制备的硅碳复合负极材料具有较好的电化学性能,首次放电比容量为529 mAh/g, 30次循环后,可逆效率为99.47%,以上结果表明多孔硅与石墨复合改善了材料导电性而提高其电化学性能。
The composite of silicon and carbon was prepared by blending graphite particles and porous silicon producted by magnesium thermal reduction of the white carbon black.The structure and morphology of the as-prepared materials were characterized by XRD,BET and SEM,and the results demonstrated that the silicon material was loose,porous,and evenly distributed.These structures can effectively alleviate the volume expansion effect of silicon particles.The results of electrochemical property show that the cycling stability and reversible charge and discharge capacity of the composite has been improved,with a first discharge specific capacity of 529 mAh/g.After 30 cycles,the reversible efficiency is 99.47%,indicating that the composite of porous silicon and graphite improves the conductivity of the materials and enhances electrochemical performance.
作者
孙超群
安玉良
谢驰
孔汉文
SUN Chaoqun;An Yuliang;XIE Chi;KONG Hanwen(School of Material Science and Engineering,Shenyang Ligong University,Shenyang 110159,China)
出处
《功能材料》
北大核心
2025年第7期7170-7174,共5页
Journal of Functional Materials
基金
国家自然基金项目(52374271)
准格尔旗科技重大专项(2407002)。
关键词
锂离子电池
负极材料
镁热还原
硅碳复合
多孔硅
lithium-ion batteries
anode material
magnesium thermal reduction
silicon-carbon composite
porous silicon
