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 juil. 2019
First published
15 juil. 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements