Sulphur-template method for facile manufacturing porous silicon electrodes with enhanced electrochemical performance  

作　　者：Peng Zhou Ziang Jiang Yang Li Peng Xiao Feixiang Wu 

机构地区：[1]Powder Metallurgy Research Institute,School of Metallurgy and Environment,Central South University,Changsha 410083,China

出　　处：《Chinese Chemical Letters》2024年第8期433-436,共4页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51904344,52172264);the Natural Science Foundation of Hunan Province of China(Nos.2021JJ10060,2022GK2033).

摘　　要：Sulphur(S)-template method based on conventional slurry-casting method has been developed to pro-duce porous silicon(Si)electrodes.The facile fabrication technology is suitable for current production line and expected to be widely applied to various electrode materials under large volume change during operation.Specifically,S particles as template agent are mixed with active material Si,carbon conductor and binder forming uniform slurry.After casting and drying,the electrodes are immersed in carbon disul-fide solution to remove S particles rapidly,generating pores in-situ at the original position of S particles.Electrochemical analysis shows that the pores inside electrodes are able to shorten lithium ion diffusion paths,reduce normal expansion rate and decrease formation of cracks in the Si electrode(2 mg_(Si)/cm^(2)),demonstrating a reversible capacity of 951 mAh/g at 0.5 A/g after 100 cycles(with a capacity retention of 99.5%)and a capacity of-826 mAh/g at 2 A/g.

关 键 词：Sulphur-template Porous electrodes Silicon anodes Low volume expansion Lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.54[理学—物理化学] TQ127.2[理学—化学]