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Reduction of bis(Oxalato)Borate on a High Surface Area Carbon Electrode

Published online by Cambridge University Press:  15 March 2011

John Flynn  and
Carl Schlaikjer
John Flynn
Affiliation:
Tracer Technologies Inc., 20 Assembly Square Drive, Somerville, Massachusetts 02145
Carl Schlaikjer
Affiliation:
Tracer Technologies Inc., 20 Assembly Square Drive, Somerville, Massachusetts 02145
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Abstract

Lithium bis(oxalato)borate (LiBOB) has gained widespread interest as an electrolyte salt for lithium ion batteries because of its high conductivity, low cost, thermal stability, and adequate solubility in many organic solvents [1]. Cyclic voltammetric data taken on platinum [2] and carbon [3] indicate electrochemical stability over a wide potential range.

We show that bis(oxalato)borate (BOB) can be reduced at about 1.75 volts anodic to lithium, by discharging electrolytes at low current density (0.1 mA/cm2) on high surface area carbon electrodes containing a mixture of acetylene and Ketjen carbon blacks. The evidence includes discharge profiles and 11B NMR data. The behavior of discharge plateaus indicates that BOB is reduced to a soluble species with electrolytic properties, and the appearance of a broad 11B NMR peak in the electrolyte indicates that the reduced species undergoes extensive exchange.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1127: Symposium T – Mobile Energy , 2008 , 1127-T03-11
Copyright
Copyright © Materials Research Society 2009

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References

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