新型炭材料（中英文）2023，Vol.38Issue(5)：964-975,12.DOI:10.1016/S1872-5805(23)60707-3
锂离子电池硅炭负极材料的制备与电化学性能研究
Synthesis and electrochemical properties of nano-Si/C composite anodes for lithium-ion batteries
摘要
Abstract
Phenolic resin was coated on the surface of nano-Si by a microencapsulation technique,and then carbonized under Ar protection to prepare a nano-Si/C composite.The composites were first prepared using 4 different mass ratios(1∶2,1∶4,1∶6,1∶8)of phenolic resin to nano-Si.The obtained average thicknesses of amorphous carbon coating were 7,4.5,3.7,2.8 nm,respect-ively.By comparing the cycling and rate capability,the best electrochemical performance was obtained when this ratio was 1∶4,with a 4.5 nm amorphous carbon coating.The electrochemical properties of this material were then comprehensively evaluated,showing excellent electrochemical performance as an anode material for Li-ion batteries.At a current density of 100 mAg-1,the ma-terial had a first specific discharge capacity of 2382 mAhg-1,a first charge specific capacity of 1667 mAhg-1,and an initial cou-lombic efficiency of 70%.A discharge specific capacity of 835.6 mAhg-1 was retained after 200 cycles with a high coulombic effi-ciency of 99.2%.In addition,the nano-Si/C composite demonstrated superior rate performance.Under current densities of 100,200,500,1000 and 2000 mAg-1,the average specific discharge capacities were 1716.4,1231.6,911.7,676.1 and 339.8 mAh g-1,re-spectively.When the current density returned to 100 mA g-1,the specific capacity returned to 1326.4 mAh g-1.关键词
微胶囊技术/锂离子电池/硅负极/高容量/低成本Key words
Microencapsulation technology/Lithium-ion batteries/Silicon anode/High capacity/Low-cost引用本文复制引用
袁立业,吕春祥,吕晓轩,袁淑霞,张甍,曹莉娟,杨禹..锂离子电池硅炭负极材料的制备与电化学性能研究[J].新型炭材料（中英文）,2023,38(5):964-975,12.基金项目
This work is funded by"Supported by Funda-mental Research Program of Shanxi Province(20210302124312)".We would also like to thank Shiyanjia Lab(www.shiyanjia.com)for the XRD ana-lysis. （20210302124312）
