电池2023，Vol.53Issue(6)：596-599,4.DOI:10.19535/j.1001-1579.2023.06.002
磷酸铁锂锂离子电池容量衰减机理分析
Analysis of capacity fading mechanism of LiFePO4 Li-ion battery
厉运杰 1赵宣 1王利 1陶常法2
作者信息
- 1. 合肥国轩高科动力能源有限公司,安徽 合肥 230011
- 2. 合肥工业大学汽车与交通工程学院,安徽 合肥 230011
- 折叠
摘要
Abstract
It was very important to analyze the mechanism of capacity fading for optimizing the battery system.The capacity fading mechanism of 23 Ah square aluminum shell lithium iron phosphate(LiFePO4)Li-ion battery cycled at elevated temperature(55℃)was studied.The surface morphology,crystal structure and interface composition of materials was analyzed by SEM,energy dispersive X-ray spectroscopy(EDS),XRD,inductive coupled plasma emission spectrometer(ICP)and Fourier transform infrared spectroscopy(FTIR).The quantitative analysis capacity fading mechanism of cycled battery at elevated temperature based on differential voltage analysis(DVA)and half button cell analysis was carried out.The overall structure of the electrode active material of the failed battery was not destroyed,cracks appeared on the surface of the cathode active material particles,the solid electrolyte interface(SEI)film of the anode thickened,the proportion of organic lithium compounds increased.DVA results showed that loss lithium inventory(LLI)and loss active material(LAM)accounted for 74.82%and 25.18%of the capacity fade of full battery,respectively.The coin-type half cell tests showed that anode SEI and dead lithium,cathode electrolyte interface(CEI)and cathode structure loss accounted for 77.13%,1.83%and 21.04%of the capacity fade of full battery,respectively.关键词
磷酸铁锂(LiFePO4)锂离子电池/高温循环/定量分析/失效机理/容量衰减Key words
lithium iron phosphate(LiFePO4)Li-ion battery/elevated temperature cycle/quantitative analysis/failure mechanism/capacity fading分类
信息技术与安全科学引用本文复制引用
厉运杰,赵宣,王利,陶常法..磷酸铁锂锂离子电池容量衰减机理分析[J].电池,2023,53(6):596-599,4.
