Title

Inhibition of electrolyte oxidation in lithium ion batteries with electrolyte additives

Document Type

Article

Date of Original Version

10-22-2009

Abstract

The incorporation of additives designed to sacrificially react on the surface of cathode materials in lithium ion batteries has been investigated. Addition of low concentrations of either 2,5-dihydrofuran or γ -butyrolactone to 1 M LiPF6 in 1:1:1 ethylene carbonate/diethyl carbonate/dimethyl carbonate improves the capacity retention of Li/Li 1.17Mn0.58Ni0.25O2 cells cycled at 4.9 V vs Li. A surface analysis of the cathode materials (X-ray photoelectron spectroscopy and IR) suggests that the 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. © 2009 The Electrochemical Society.

Publication Title

Electrochemical and Solid-State Letters

Volume

12

Issue

12

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