首页|LiFSI电解液高温下的铝箔腐蚀机理

LiFSI电解液高温下的铝箔腐蚀机理

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双氟磺酰亚胺锂(LiFSI)因其优异的性能有望取代六氟磷酸锂.利用LiFSI解决铝(Al)集流体在高温下的腐蚀问题至关重要.结合密度泛函理论计算和光谱学研究45℃下LiFSI电解液中铝的腐蚀机理.研究发现,随着温度的升高,由Al(FSI)3溶解形成的不规则的、疏松的、对铝箔不具保护作用的AlF3加剧高温下铝的腐蚀.双草酸硼酸锂(LiBOB)对铝的腐蚀有较好的抑制作用.LiBOB的加入改变铝箔和电解液之间的界面反应,使铝箔表面形成一层坚固、具有保护作用的固体界面膜,含硼化合物促进AlF3向LiF的变化,从而进一步加强固体界面膜的牢固性.本研究为LiFSI在锂离子电池中的应用提供合理设计铝箔界面的途径.
Mechanism of aluminum corrosion in LiFSI-based electrolyte at elevated temperatures
Lithium bis(fluorosulfonyl)imide (LiFSI) is a promising replacement for lithium hexafluorosphate due to its excellent properties. A solution to the corrosion of aluminum (Al) current collectors by LiFSI at elevated temperatures is essential. The mechanisms of Al corrosion in LiFSI-based electrolyte at 45 ℃ were studied with density functional theory calculations and spectroscopic investigations. It is found that the irregular, loose and unprotected AlF3 materials caused by the dissolution of co-generated Al(FSI)3 can exacerbate Al corrosion with the increase of temperature. Lithium bis(oxalate)borate (LiBOB) can effectively inhibit the Al corrosion with a robust and protective interphase;this can be attributed to the interfacial interactions between the Al foil and electrolyte. Boron-containing compounds promote the change from AlF3 to LiF, which further reinforces interfacial stability. This work allows the design of an interface to Al foil using LiFSI salt in lithium-ion batteries.

lithium-ion batteriesLiFSI-based electrolytelithium bis(oxalate)borate (LiBOB)corrosion inhibitionelevated temperaturesinterfacial film

李春雷、曾双威、王鹏、李昭娟、杨莉、赵东妮、王洁、刘海宁、李世友

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兰州理工大学 石油化工学院,兰州 730050

中国科学院 青海盐湖所 盐湖资源综合高效利用重点实验室,西宁 810008

锂离子电池 LiFSI基电解液 双草酸硼酸锂(LiBOB) 腐蚀抑制 高温 界面膜

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaMajor Science and Technology Projects of Gansu Province,ChinaChinese Academy of Sciences"Western Light"Young Scholars Project,and Lanzhou University of Technology Hongliu First-class Di

217660175196201918ZD2FA012

2021

10.1016/S1003-6326(21)65588-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(5)
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