电源技术2026，Vol.50Issue(8)：1435-1440,6.DOI:10.3969/j.issn.1002-087X.2026.08.005
8C快充锂离子电池的石墨负极设计
Graphite anode design for 8 C fast-charging lithium-ion batteries
李圆圆 1吴继鹏 1刘超辉 1钱振扬 1谢强胜1
作者信息
- 1. 合肥国轩高科动力能源有限公司,安徽 合肥 230000
- 折叠
摘要
Abstract
To address the bottleneck of insufficient insertion kinetics of graphite anodes for fast charg-ing,this study achieves the 8 C fast-charging target through collaborative design of coke material se-lection,grinding,granulation,and soft carbon coating.Isotropic petroleum coke and anisotropic needle coke were selected and ground to 7.5 and 6.5 μm,respectively,to balance the kinetics of lithium-ion intercalation and diffusion between graphite layers.Subsequently,granulation and soft carbon coating were employed to further improve insertion kinetics.For the graphite design using pe-troleum coke with granulation and coating after graphitization(2.5％coating amount),soft carbon connections between primary particles resulted in low charge transfer impedance and small diffusion impedance,indicating excellent kinetic performance.However,its high-temperature storage and high-temperature cycling performance were poor.The design using petroleum coke with granulation be-fore graphitization and coating after graphitization(1.8％coating amount)demonstrated superior high-temperature storage performance,but its charge transfer impedance and diffusion impedance were high,leading to suboptimal kinetic performance.The design using needle coke with granulation before graphitization and coating after graphitization(1.8％coating amount)achieved the best over-all performance in terms of kinetics,storage,and cycling.When the capacity retention rate decayed to 80％,the fast-charging cycling and high-temperature cycling trends reached 4 000 and 1 500 cycles,respectively.This study provides design insights for the development of graphite materials for 8 C and higher-rate fast charging.关键词
锂离子电池/石墨/焦原料/颗粒设计/软碳包覆Key words
lithium-ion battery/graphite/coke material/particle design/soft carbon coating分类
信息技术与安全科学引用本文复制引用
李圆圆,吴继鹏,刘超辉,钱振扬,谢强胜..8C快充锂离子电池的石墨负极设计[J].电源技术,2026,50(8):1435-1440,6.
