Positive electrode protective layer composition, rechargeable lithium battery including protective layer for positive electrode and method of manufacturing same

摘要

A positive electrode protective layer composition of a rechargeable lithium battery includes a polymer compound and an ionic liquid including a borate-based anion. A rechargeable lithium battery includes the positive electrode protective layer. A method of manufacturing the same is also provided.

主权项

1. A positive electrode protective layer composition of a rechargeable lithium battery, comprising:
a polymer compound selected from the group consisting of ester-containing polymer compounds; and an ionic liquid including a borate-based anion, wherein the polymer compound and the borate-based anion are configured to be linked to each other and reduce elution of transition elements from a positive electrode, wherein the ester-containing polymer compound is selected from the group consisting of substituted and unsubstituted carboxylate-containing polymer compounds, substituted and unsubstituted (meth) acrylate-containing polymer compounds, and combinations thereof, wherein the composition further comprises a solvent, wherein the polymer compound, the ionic liquid, and the solvent of the positive electrode protective layer composition are included at about 1 wt% to 20 wt%, about 1wt% to 10 wt%, and about 70 wt% to 98 wt%, respectively, based on the total weight of the positive electrode protective layer composition.