Issue 41, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
17 mai 2019
Accepted
09 jul 2019
First published
15 jul 2019

J. Mater. Chem. A, 2019,7, 23922-23930

Author version available

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, 7, 23922 DOI: 10.1039/C9TA05243G

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