Title

Inhibition of the detrimental effects of water impurities in lithium-ion batteries

Document Type

Article

Date of Original Version

2-19-2007

Abstract

The effect of dimethyl acetamide (DMAc) on the stability of LiP F6 based electrolytes contaminated with water impurities has been investigated. Addition of 1% DMAc to 1 M LiP F6 in 1:1:1 ethylene carbonate/diethyl carbonate/dimethyl carbonate (EC/DEC/DMC) with 0.5% water impurity was found to inhibit the generation of HF and other decomposition products. The presence of water results in a decrease in the first cycle efficiency and an increase in the capacity fade in following cycles. The addition of DMAc to water containing electrolytes has little effect on the first cycle efficiency, but it reduces the capacity fade of the batteries containing water impurities by 72%. © 2007 The Electrochemical Society.

Publication Title

Electrochemical and Solid-State Letters

Volume

10

Issue

4

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