充电截止电压对SEI膜组分及结构的影响

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中图分类号：U463 DOI：10.20042/j.cnki.1009-4903.2025.02.013

Abstract：TheSEIfilmisapassivationfilmformedonthesurfaceofthenegativeelectrodeofalithiumbatterybyanirreversible reatinwithteelectrolytandthispassiationfimsacoerelatioshiithtecompositionofthepositiveandnegativeeletrode materials，theelectrolytecomponents，andthechargingproces.Thechangeinthechargingcut-offvoltageduringthecharging processcancausecangesintecompotiofteSEfim.Inthisstudyateryamplewitefereneelectrodewasusedhich wasathree-componentsystem（8650type）.Diferentchargingcutoffvotageswereappliedduringthechargingprocess.Thevotage dataunderthereferenceelectrodewerecolected.BycomparingtheSElfimcomponentanalysisofthenegativeelectrodeofthe battery with different charging cut-off voltages，it was found that when the charging cut-off voltage was 3.5V a SEI film rich in Li2CO3 was formed.The inorganic compound rich in Li2CO3 formsa thin and dense SEl film，which results in good high-temperature storage and cycling performance of the battery.

Keywords：Liionbatery;Formationvoltage;Solidelectrolyteinterphase（SEl）fim;Theeelectrode;Hightemperaturestorage

0 引言

锂离子电池具有高比能、长寿命、高倍率特性，因而广泛应用于电化学储能装置。（剩余5181字）