Title

Inorganic additives for passivation of high voltage cathode materials

Document Type

Article

Date of Original Version

2-15-2011

Abstract

The incorporation of additives designed to sacrificially react on the surface of cathode materials of lithium ion batteries has been investigated. Addition of low concentrations of inorganic additives including lithium bisoxalatoborate (LiBOB), lithium difluorooxalatoborate (LiBF2(C 2O4)), and tetramethoxy titanium (TMTi) to 1 M LiPF 6 in 1:1:1 EC/DEC/DMC improves the capacity retention of Li/Li 1.17Mn0.58Ni0.25O2 cells cycled to 4.9 V vs. Li. Surface analysis of the cathode materials (XPS and IR) suggests that structure of the cathode surface film is modified by the presence of the additives resulting in a decrease in detrimental electrolyte oxidation reactions on the cathode surface. © 2010 Elsevier B.V. All rights reserved.

Publication Title

Journal of Power Sources

Volume

196

Issue

4

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