Title

Effect of added LiBOB on high voltage (LiNi 0.5Mn 1.5O 4) spinel cathodes

Document Type

Article

Date of Original Version

1-1-2012

Abstract

Lithium bis(oxalato)borate (LiBOB) was investigated as an additive to improve the performance of LiNi 0.5Mn 1.5O 4 cathodes cycled to high voltage (4.9 V vs Li). Incorporation of low concentrations of LiBOB (0.25-1.0%, wt) results in a significant improvement in the capacity retention and cycling efficiency of LiNi 0.5Mn 1.5O 4/Li cells. Electrochemical impedance spectroscopy indicates that the addition of LiBOB decreases cell impedance. Ex-situ surface analysis of cycled cells suggests that the cathode surface films are thinner in cells cycled with added LiBOB. The addition of LiBOB inhibits detrimental reactions of the electrolyte with the surface of LiNi 0.5Mn 1.5O 4 cathodes at high voltage. © 2011 The Electrochemical Society.

Publication Title

Electrochemical and Solid-State Letters

Volume

15

Issue

2

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