储能科学与技术2024，Vol.13Issue(10)：3504-3514,11.DOI:10.19799/j.cnki.2095-4239.2024.0272
高镍/碳硅三元锂离子电池循环老化机理研究
Study on the cyclic aging mechanism of nickel-rich silicon-graphite lithium-ion cells
摘要
Abstract
High nickel lithium-ion batteries offer high energy density and power density,making them widely used today.However,capacity loss due to aging remains a challenge for their efficient utilization.This study investigates the aging mechanism of high-nickel lithium-ion batteries,conducting cyclic aging experiments on high-nickel/silicon carbon-based lithium batteries.The aging modes at different life stages of high-nickel ternary lithium-ion batteries are comprehensively analyzed and verified using both nondestructive and destructive tests.The results indicate that the capacity of Li-ion batteries decreases in two distinct stages.In the first stage,the capacity loss is linear,primarily due to the loss of lithium ions,with the main aging mechanisms being the growth of the SEI and the degradation of anode materials.In the second stage,the capacity decreases abruptly,driven by both the loss of lithium ions and a decline in electrical conductivity.The primary aging mechanisms during this stage include the dissolution of cathode materials,irreversible changes in cathode crystal structures,and the degradation of the battery separator.The main aging mechanisms include the dissolution of anode material,irreversible changes in anode crystal structure,and blockage of the battery separator.Computed tomography analysis of the overall morphology of lithium-ion batteries at different life stages reveals that the initial battery production process significantly impacts the areas where aging occurs.XPS test results indicate that the passivation layer on the surfaces of both the anode and cathode continues to thicken throughout the battery's cycling experiments.Additionally,the deposition of transition metal Ni on the surface of the cathode material is observed,which significantly affects the battery's energy storage capacity.This paper reveals the aging characteristics and mechanism of high-nickel lithium battery,offering valuable theoretical insights for the graded utilization of these batteries.关键词
高镍/碳硅三元锂电池/电池容量损失/电化学特性/形貌特征/老化机理Key words
high-nickel ternary lithium battery/aging characteristics battery capacity loss/electrochemical characteristics/morphological characteristics/aging mechanism分类
信息技术与安全科学引用本文复制引用
胡文豪,赵晨曦,孙卓尔,张沛,王学辉,汪箭..高镍/碳硅三元锂离子电池循环老化机理研究[J].储能科学与技术,2024,13(10):3504-3514,11.基金项目
应急管理部消防救援局重点研发计划项目(2022XFZD12),广东省应用基础研究基金(2021B1515130008),国家重点研发计划项目(No.2022YFC3006300). （2022XFZD12）
