Lithium hexafluorophosphate(LiPF6)electrolyte is widely used in commercial lithium batter-ies,but it has poor thermal stability and is easy to hydrolyze.In contrast,Lithium bis(trifluoromethylsul-phonyl)imide(LiTFSI)has good thermal stability and is stable to hydrolysis,which is expected to replace LiPF6.However,the corrosion of current collector aluminum foil by LiTFSI electrolyte hinders its large-scale practical application.In this paper,the above problems were effectively solved by adding an appropri-ate amount of isophorone diisocyanate(IPDI).The results show that IPDI can form a protective layer of aluminum nitride(AIN)on the surface of aluminum current collector,which effectively inhibits the corro-sion of aluminum foil by LiTFSI electrolyte.At the same time,the introduction of IPDI effectively im-proves the oxidation stability of the electrolyte and expands the electrochemical window.In addition,the ap-propriate amount of IPDI improves the compatibility of LiTFSI electrolyte with lithium metal,inhibits lithium dendrites,and improves the stripping coulombic efficiency(CE)of Li/Cu deposition.More impor-tantly,the introduction of IPDI significantly improves the cycle performance and rate performance of lithium batteries.The capacity retention rate of Li/LiFePO4 battery is as high as 98％after 400 cycles.This work provides a new design idea and research direction for inhibiting the corrosion of aluminum foil.
维普
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