储能科学与技术2026，Vol.15Issue(1)：31-37,7.DOI:10.19799/j.cnki.2095-4239.2025.0841
4C快充锂离子电池的石墨负极和电解液设计
Graphite anode and electrolyte design for 4C fast-charging lithium-ion batteries
李圆圆 1刘欣 1刘超辉 1陈宇 1杨小龙 1钱振扬 1杨卓群 1郭万颖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
Fast-charging capability in lithium-ion batteries(LIBs)is essential for the large-scale commercial success of electric vehicles,and the development of 4 C fast-charging technology is therefore critical.To address the sluggish kinetics of lithium-ion intercalation into graphite—the primary bottleneck for fast charging—this study evaluates soft carbon coating on graphite and the use of ethyl acetate(EA)as an electrolyte solvent.A three-factor,two-level full factorial experiment was conducted to investigate the coating method(solid-phase,liquid-phase),coating amount(1.0%,1.5%),and EA content in the electrolyte(10%,70%).Their effects on internal resistance,storage performance,and cycling performance in LIBs were systematically examined.Increasing graphite disorder through coating and adding EA to enhance electrolyte conductivity reduced internal resistance but deteriorated storage and cycling performance.For internal-resistance optimization,70%EA exhibited the strongest effect,while liquid-phase coating outperformed the 1.5%coating amount,achieving direct-current internal-resistance reductions of 21.12%,4.83%,and 2.53%.For storage performance deterioration,70%EA caused the largest decrease,slightly exceeding that of liquid-phase coating,with capacity-retention drops of 1.26%and 1.17%.The 1.5%coating amount impaired 7-day storage performance but showed no measurable deterioration at 28 days.Under 4 C fast-charging cycling,70%EA caused the most severe degradation,while liquid-phase coating and the 1.5%coating amount produced comparable decreases in 600-cycle capacity retention of 1.58%,0.35%,and 0.33%.For high-temperature cycling,70%EA again had the most detrimental effect,followed by 1.5%coating,inducing capacity-retention losses of 0.97%and 0.24%;liquid-phase coating showed no observable deterioration,demonstrating its advantage.These findings provide valuable guidance for material and system design in 4 C fast-charging LIBs.关键词
锂离子电池/石墨/软碳包覆/电解液/乙酸乙酯Key words
lithium-ion battery/graphite/soft carbon coating/electrolyte/ethyl acetate分类
信息技术与安全科学引用本文复制引用
李圆圆,刘欣,刘超辉,陈宇,杨小龙,钱振扬,杨卓群,郭万颖..4C快充锂离子电池的石墨负极和电解液设计[J].储能科学与技术,2026,15(1):31-37,7.
