Synthesis of carbon nanotubes-supported porous silicon microparticles in low-temperature molten salt for highperformance Li-ion battery anodes  

作　　者：Qianliang Zhang Baojuan Xi Weihua Chen Jinkui Feng Yitai Qian Shenglin Xiong 

机构地区：[1]Key Laboratory of Colloid and Interface Chemistry,Ministry of Education,School of Chemistry and Chemical Engineering,State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [2]Key Laboratory of Material Processing and Mold of Ministry of Education,Zhengzhou University,Zhengzhou 450001,China [3]Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials,Ministry of Education,School of Materials Science and Engineering,Shandong University,Jinan 250061,China

出　　处：《Nano Research》2022年第7期6184-6191,共8页纳米研究（英文版）

基　　金：The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China(Nos.U21A2077,21971145,and 21871164);the Taishan Scholar Project Foundation of Shandong Province(No.ts20190908);the Natural Science Foundation of Shandong Province(Nos.ZR2021ZD05 and ZR2019MB024);Young Scholars Program of Shandong University(No.2017WLJH15).

摘　　要：Silicon-based materials has attracted attention as a promising candidate for lithium-ion batteries(LIBs)with high energy density.However,severe volume variation,pulverization,and poor conductivity hindered the development of Si based materials.In this study,porous Si microparticles supported by carbon nanotubes(p-Si/CNT)are fabricated through simple molten salt assisted dealloying process at low temperature followed by acid treatment.The ZnCl2 molten salt not only provides the liquid environment to enhance the reaction,but also participates the dealloying process and works as template for porous structure when removes by acid treatment.Additionally,distribution of defect sites in CNTs also increases after molten salt process.Density function theory(DFT)calculations further prove the defects could improve the adsorption of Li+.The participation of CNTs can also contribute to the reaction kinetics and retain the integrity of the electrode.As expected,the p-Si/CNT anode manifests enhanced lithium-storage performance in terms of superior cycling stability and good rate capability.The p-Si/CNT//LiCoO_(2) full cell assembly further demonstrates its potential as a prospective anode for high-performance LIBs.

关 键 词：porous Si microparticles carbon nanotubes molten salt lithium-ion batteries 

分 类 号：TB3[一般工业技术—材料科学与工程]