电池2026，Vol.56Issue(2)：361-368,8.DOI:10.19535/j.1001-1579.2026.02.010
磷酸铁锂锂离子电池电极过充衰减特性
Overcharge degradation characteristics of LiFePO4 Li-ion battery electrode
摘要
Abstract
Overcharging accelerates the degradation of lithium iron phosphate(LiFePO4)Li-ion battery and increases the risk of thermal runaway.Based on the three-electrode system,the single electrode of LiFePO4 Li-ion battery under overcharge condition is monitored in situ,the electrode decay behavior is identified from voltage and impedance.Firstly,qualitative and quantitative analysis of lithium deposition/stripping process is performed based on full battery voltage and differential voltage curve.Secondly,the electrode impedance is analyzed by electrochemical impedance spectroscopy(EIS)and Pearson correlation coefficient,the characteristic frequencies reflecting the electrode impedance are screened.Finally,the aging electrode materials are analyzed by SEM and energy dispersive X-ray spectroscopy(EDS).Overcharge cycling accelerates battery degradation and promotes irreversible lithium deposition.As the impedance of the battery increases,the cathode charge transfer resistance dominates the impedance response in the low-frequency region,whereas the anode solid electrolyte interphase(SEI)film resistance governs the mid-frequency region.SEI film formation on the anode leads to active lithium loss,while particle cracking in cathode results in active material loss.关键词
磷酸铁锂(LiFePO4)/锂离子电池/过充电/三电极体系/锂沉积/电化学阻抗谱(EIS)Key words
lithium iron phosphate(LiFePO4)/Li-ion battery/overcharge/three-electrode system/lithium plating/electrochemical impedance spectroscopy(EIS)分类
信息技术与安全科学引用本文复制引用
吴祎,章秦毅,江兵,陶锴..磷酸铁锂锂离子电池电极过充衰减特性[J].电池,2026,56(2):361-368,8.基金项目
国家自然科学基金(62103198),江苏省自然科学基金(BK20210600),江苏省科技智库青年人才计划(JSKX0125061),南京邮电大学校级自然科学基金(NY223098) （62103198）
