摘要
硅基材料作为锂离子电池负极的理论容量达到4200 mAh·g^(-1),被认为是最有发展前景的负极材料。但其体积膨胀过大,导致循环稳定性较差。通过球磨+碳包覆的方法,对线切割的纳米片层状多晶硅硅泥进行改性,使其作为锂离子电池负极材料的电化学性能得到了改善。结果表明,球磨使原料硅泥粒径明显减小。在电流密度为200 mA·g^(-1)时,原料硅泥球磨20 h后碳包覆的C-Si_(20)的首次充电比容量为1784.2 mAh·g^(-1)。循环75次后充电比容量为640 mAh·g^(-1),充放电库伦效率保持在98%以上。材料具有比较好的循环性能,可以为光伏产业硅泥废料的回收再利用提供一定的借鉴意义。
Silicon-based materials have a theoretical capacity of 4200 mAh/g as anodes for lithium-ion batteries,which is considered the most promising anode materials.However,its volume expansion is too large,resulting in poor cycle stability.Using ball milling and carbon-coated way to modify the nano layered polycrystalline silicon sludge of wire-cutting improves its electrochemical performance as a lithium-ion battery anode material.The results show that ball milling significantly reduces the particle size of raw silicon mud.When the current density is 200 mA/g,the first charging specific capacity of C-Si_(20)(the raw silicon mud which is ball milled for 20 h after carbon-coated)is 1784.2 mAh/g.After 75 cycles,the specific charge capacity is 640 mAh/g,and the charge-discharge coulomb efficiency remains above 98%.The material has pretty good cycle performance and can provide a certain reference for the recycling and reuse of silicon mud waste in the photovoltaic industry.
作者
富世伯
杨绍斌
董伟
李希萌
夏英凯
FU Shibo;YANG Shaobin;DONG Wei;LI Ximeng;XIA Yingkai(College of Material Science and Engineering,Liaoning Technical University,Fuxin 123000,China;College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第8期8156-8161,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51774175)。
关键词
锂离子电池
多晶硅硅泥
酚醛树脂
复合
负极材料
lithium-ion battery
polysilicon silicon mud
phenolic resin
composite
anode material
