Impact of formation charge state on the performance of LiFePO4 battery systems
YU Kaiming
LUO Yuanhao
Abstract：Different forming processes will affect the formation of negative solid electrolyte interface membrane(SEI film),which also will affect the cell performance.In this paper,the effects of three different charge states(SOC)formation processes on the electrode morphology,first efficiency,resistance,high temperature storage and cycle performance of LiFePO4 cell were studied.The results show that 62%state of charge(SOC)during formation which makes the SEI on the anode electrode surface is uniform and compact,the first efficiency(90.26%)is the highest,the DC resistance(DCR)and resistance of film formation are the lowest,the high temperature storage retention rate(96.41%)is the highest,and after 1 731 cycles at high temperature is 81.52%,the comprehensive performance is the best.
Keywords：formation processSEI filmSOCLiFePO4
Publication Date：2026-02-25
Online Publishing Date：2026-03-13(First online date of this platform, not the publication date of the document)
Pages：5( 44-48 )