The accumulation of LiCO in a Li-O battery with dual mediators

One of the most important challenges facing long cycle life Li-O 2 batteries is solvent degradation. Even the most stable ethers, such as CH 3 O(CH 2 CH 2 O)CH 3 , degrade to form products including Li 2 CO 3 , which accumulates in the pores of the gas diffusion electrode on cycling leading to polar...

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Bibliographic Details
Published in:Faraday discussions 2024-01, Vol.248, p.318-326
Main Authors: Jenkins, Max, Dewar, Daniel, Nimmo, Tammy, Chau, Chloe, Gao, Xiangwen, Bruce, Peter G
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Summary:One of the most important challenges facing long cycle life Li-O 2 batteries is solvent degradation. Even the most stable ethers, such as CH 3 O(CH 2 CH 2 O)CH 3 , degrade to form products including Li 2 CO 3 , which accumulates in the pores of the gas diffusion electrode on cycling leading to polarisation and capacity fading. In this work, we examine the build-up and distribution of Li 2 CO 3 within the porous gas diffusion electrode during cycling and its link to the cell failure. We also demonstrate that the removal of Li 2 CO 3 by a redox mediator can partially recover the cell performance and extend the cycle life of a Li-O 2 battery. We examine the build-up and distribution of Li 2 CO 3 within the porous gas diffusion electrode during cycling and its link to cell failure.
ISSN:1359-6640
1364-5498
DOI:10.1039/d3fd00105a