The accumulation of Li2CO3 in a Li–O2 battery with dual mediators

One of the most important challenges facing long cycle life Li–O2 batteries is solvent degradation. Even the most stable ethers, such as CH3O(CH2CH2O)CH3, degrade to form products including Li2CO3, which accumulates in the pores of the gas diffusion electrode on cycling leading to polarisation and c...

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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
Format: Article
Language:English
Subjects:
Cycles
Electrode polarization
Electrodes
Ethers
Gaseous diffusion
Lithium carbonate
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Summary:One of the most important challenges facing long cycle life Li–O2 batteries is solvent degradation. Even the most stable ethers, such as CH3O(CH2CH2O)CH3, degrade to form products including Li2CO3, 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 Li2CO3 within the porous gas diffusion electrode during cycling and its link to the cell failure. We also demonstrate that the removal of Li2CO3 by a redox mediator can partially recover the cell performance and extend the cycle life of a Li–O2 battery.
ISSN:1359-6640
1364-5498
DOI:10.1039/d3fd00105a