新型炭材料2022，Vol.37Issue(1)：245-258,14.DOI:10.1016/S1872-5805(22)60580-8
优化碳质涂层以消除高性能硅阳极的电化学界面极化优化碳质涂层以消除高性能硅阳极的电化学界面极化
Optimizing the carbon coating to eliminate electrochemical interface polarization in a high performance silicon anode for use in a lithium-ion battery
摘要
Abstract
Ordered and disordered carbons have been commonly used as coating materials for silicon (Si) anodes, however the effect of carbons with different crystallinities and pore structures on their electrochemical performance remains controversial. We used pitch and phenolic resin (PR) as the precursors of ordered and disordered carbon, respectively, to prepare carbon-coated silicon (Si@C) with strictly controlled carbon contents and surface functional groups. Their electrochemical behavior was investigated. An ordered crystalline structure is favorable for electron transport, and mesopores and macropores are conducive to the diffusion of lithium ions. Such a coating with a small pore volume is an excellent buffer for the expansion of Si, and the electrode maintains structural integrity for 50 cycles. A disordered porous structure is less robust and produces a large polarization, which produces continuous volume expansion with cycling and leads to inferior electrochemical performance. As a result, the capacity and capacity retention after 100 cycles at 0.5 A g?1 of Si@C-Pitch are respectively 8 times and 1.9 times those of Si@C-PR. This study provides theoretical guidance for the selection of carbon materials used in Si@C anodes.关键词
硅碳复合物/晶体结构/孔结构/失效机制/极化Key words
Silicon-carbon composites/Crystalline structure/Pore structure/Failure mechanism/Polarization分类
通用工业技术引用本文复制引用
齐志燕,陈成猛,戴丽琴,王哲帆,谢莉婧,陈景鹏,成家瑶,宋歌,李晓明,孙国华..优化碳质涂层以消除高性能硅阳极的电化学界面极化优化碳质涂层以消除高性能硅阳极的电化学界面极化[J].新型炭材料,2022,37(1):245-258,14.基金项目
All authors appreciate the financial support of Research and Development Project of Key Core and Common Technology of Shanxi Province(2020XXX014),National Key Research and Develop-ment(R&D)Program of China(2020YFB1505800).2020年山西省关键核心技术和共性技术研发攻关专项(2020XXX014) （2020XXX014）
国家重点研发计划(2020YFB1505800). （2020YFB1505800）
