SECM Dissolution Studies of Pasted Battery Cathodes in Ionic Liquid Electrolytes

This work aims to detect the instability of cathode materials in alternate battery electrolytes known as room temperature ionic liquids. For this purpose, the scanning electrochemical microscope (SECM) has been used to detect solubilisation of species leaving LiCoO 2 battery material while cycling i...

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Bibliographic Details
Published in:ECS transactions 2014-01, Vol.58 (36), p.1-8
Main Authors: Snook, Graeme Andrew, Huynh, Thuy Diem, Best, Adam Samuel
Format: Article
Language:English
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Summary:This work aims to detect the instability of cathode materials in alternate battery electrolytes known as room temperature ionic liquids. For this purpose, the scanning electrochemical microscope (SECM) has been used to detect solubilisation of species leaving LiCoO 2 battery material while cycling in the ionic liquid electrolyte. In this work, LiCoO 2 / binder / conducting carbon mixes were pasted onto aluminium foil current collectors to simulate the behaviour in a real battery system. Here, dissolution of cobalt in overcharge conditions is observed. The added complication is that at higher voltages the aluminium current collector becomes unstable and begins to corrode. Evidence for the combined dissolution of aluminium ions and cobalt ions is presented in this work.
ISSN:1938-5862
1938-6737
DOI:10.1149/05836.0001ecst