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Chemo-mechanical degradation in V2O5 thin film cathodes of Li-ion batteries during electrochemical cycling

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Abstract

We have devised an approach to fabricate dense textured V2O5 thin films, which allows us to scrutinize the root cause of capacity fade in V2O5 cathodes of Li-ion batteries. Specifically, we performed in situ measurements of stress of V2O5 thin films during 50 electrochemical cycles. Surprisingly, electrochemical cycling appears to induce elastic and rate-independent deformation over a voltage range relevant to battery operation (4–2.8 V). However, the compressive stresses gradually increase with cycle number during the first few cycles, likely due to side reactions and/or residual Li left in the V2O5, even after delithiation (to 4 V). Further cycling leads to accumulated mechanical damage (e.g., fracture, delamination) and structural damage (e.g., amorphization), which ultimately result in severe capacity fade.

Graphical abstract: Chemo-mechanical degradation in V2O5 thin film cathodes of Li-ion batteries during electrochemical cycling

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Publication details

The article was received on 17 May 2019, accepted on 09 Jul 2019 and first published on 15 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA05243G
J. Mater. Chem. A, 2019, Advance Article

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    Chemo-mechanical degradation in V2O5 thin film cathodes of Li-ion batteries during electrochemical cycling

    Y. Zhang, Y. Luo, C. Fincher, S. Banerjee and M. Pharr, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA05243G

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