摘要
以Cu||NCM712软包电池为研究模型,通过SEM、XRD、cryo-TEM以及充放电测试等,揭示无负极锂金属电池(AF-LMBs)在存储过程中不可逆容量损失和可逆容量损失的原因和占比。研究结果表明:初始荷电态对Cu||NCM712电池在25℃下的存储性能(容量保持率和容量恢复率)无显著影响,而提高存储温度会加剧满电态电池的自放电,导致电池的可逆容量损失增加;相较于锂金属与电解液之间的化学腐蚀,锂金属与Cu集流体之间的电偶腐蚀是造成Cu||NCM712电池不可逆容量损失的主要因素。
Cu||NCM712 pouch batteries were fabricated as the research model.Combined with SEM,XRD,cryo-TEM and charge-discharge tests,the irreversible capacity loss and the reversible capacity loss during the storage process of anode-free lithium metal batteries(AF-LMBs)were evaluated qualitatively and quantitatively.The results show that the initial charging state has no significant effect on the storage performance(capacity retention rate and capacity recovery rate)of the Cu||NCM712 battery at 25℃,and the increase of storage temperature will aggravate the self discharge of the fully charged battery,resulting in an increase of the reversible capacity loss of the battery.Meanwhile,compared with the chemical corrosion between lithium metal and electrolyte,the galvanic corrosion between lithium metal and Cu collector is the main factor causing irreversible capacity loss of Cu||NCM712 battery.
作者
郭姿珠
张睿
孙旦
王海燕
黄小兵
唐有根
GUO Zizhu;ZHANG Rui;SUN Dan;WANG Haiyan;HUANG Xiaobing;TANG Yougen(College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;College of Chemical and Materials Engineering,Hunan University of Arts and Science,Changde 415000,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第2期435-442,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(22272205)
国家资助博士后研究人员项目(GZC20233152)
湖南省普通高等学校科技创新团队支持项目(2023)。
关键词
无负极锂金属电池
可逆容量损失
不可逆容量损失
存储性能
anode-free lithium metal batteries
reversible capacity loss
irreversible capacity loss
storage performance
