多孔碳包覆硅微球于锂离子电池负极中的应用  

Application of porous carbon coated silicon microspheres in cathode of lithium ion battery

作　　者：王迪[1] 邵亚川 张迪[2] 孙会兰[2] 王波[2] WANG Di;SHAO Ya-chuan;ZHANG Di;SUN Hui-lan;WANG Bo(Superalloys Division, Institute of Metal Research of Chinese Academy of Sciences, Shenyang 110016, China;School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China)

机构地区：[1]中国科学院金属研究所高温合金部,沈阳110016 [2]河北科技大学材料科学与工程学院,石家庄050018

出　　处：《沈阳工业大学学报》2020年第3期287-291,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51974103);河北省自然科学基金项目(E2019208308,E2019208179);河北省高等学校科学技术研究项目(BJ2019036,ZD2019062,QN2018122);石家庄市重点研发计划项目(181790411A).

摘　　要：为了缓解纯硅负极材料在充放电过程中带来的巨大体积效应并降低电解质与电极之间的副反应程度,提出了一种简单高效的硅碳复合材料合成方法.以P123为分散剂、葡萄糖为碳源,利用水热法制备P-Si/C复合材料.结果表明,制备得到的复合材料可以极大地缓解充放电过程中产生的体积效应.当复合材料作为锂电池负极时,其首次放电比容量为1800 mA·h/g,在500 mA/g电流密度下经100次循环后,其放电比容量能够稳定维持为521 mA·h/g,呈现出良好的循环性能.In order to alleviate the huge volume effect inflicted by pure silicon anode materials during charging and discharging process and reduce the side reaction tendency between electrolyte and electrodes,a simple and efficient method for synthesizing silicon carbon composite was proposed.Through taking P123 as dispersant and glucose as carbon source,P-Si/C composite was prepared by a hydrothermal method.The results show that the as-prepared composite can greatly alleviate the volume effect generated during the charging and discharging process.When the composite is used as a lithium cathode material,the specific discharge capacity for the first time is 1800 mA·h/g,and is stably maintained at 521 mA·h/g after 100 cycles at a current density of 500 mA/g,showing remarkable cycle performance.

关 键 词：分散剂 体积效应 硅碳复合材料 锂离子电池 负极材料 比容量 固体电解质膜 

分 类 号：TM911[电气工程—电力电子与电力传动]