In-Situ Coating of Cathode by Electrolyte Additive

It has been demonstrated that N,N -4,4 -diphenylmethane-bismale-imide as an electrolyte additive enhances the high-voltage performance of lithium-ion batteries by electrochemicaUy forming an interface film on cathode surface (36). 

2 -Bis[4-(4-maleimidophenoxy) phenyljpropane, which is more compatible with the electrolyte than N,N -4,4 -diphenylmethane-bismaleimide, has been studied as an alternative electrolyte additive. LiCoOa has been chosen as a t ical cathode material. 

The structure of the interface films on a LiCo02 surface has been studied using different concentrations of the 2,2 -bis[4-(4-maleim-idophenoxy) phenyljpropane additive. Scanning electron microscope (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used. The oxidation potential of 2,2 -bis[4-(4-maleimidophenoxy) phenyl]propane has been measured by linear sweep voltammetry (LSV) (36). 

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