Issue 43, 2024

Overcoming the interfacial challenges of Ni-rich layered oxide cathodes for all-solid-state batteries through an ultrathin and amorphous Al2O3 coating

Abstract

The utilization of Ni-rich layered LiNixCoyMn1−xyO2 (NCM, x > 0.6) cathodes in all-solid-state batteries (ASSBs) holds great promise due to their high practical capacities. However, these cathodes suffer from a rapid capacity degradation due to unwanted interface side reactions with solid electrolyte. To mitigate this issue, an ultrathin (∼0.9 nm) and amorphous Al2O3 coating layer is applied to the Ni-rich NCM cathodes using atomic layer deposition (ALD). Remarkably, this nanoscale coating leads to minimal changes in the initial capacity while significantly improving the cycle retention. Through a variety of analytical techniques, we demonstrate that the Al2O3-coated NCM cathode exhibits high cycle stability by reducing the formation of insulating by-products on the surface and suppressing the irreversible phase transition during cycling. This work demonstrates the potential of employing a thin oxide coating to address the key degradation factors in Ni-rich NCM cathodes, advancing the prospects for future ASSBs.

Graphical abstract: Overcoming the interfacial challenges of Ni-rich layered oxide cathodes for all-solid-state batteries through an ultrathin and amorphous Al2O3 coating

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Article information

Article type
Paper
Submitted
27 Jul 2024
Accepted
01 Oct 2024
First published
02 Oct 2024

J. Mater. Chem. A, 2024,12, 29826-29832

Overcoming the interfacial challenges of Ni-rich layered oxide cathodes for all-solid-state batteries through an ultrathin and amorphous Al2O3 coating

H. Shim, H. Kim, J. Y. Jung, K. Kim, H. Kim, E. Lee, D. Lee, W. Cho and S. Hong, J. Mater. Chem. A, 2024, 12, 29826 DOI: 10.1039/D4TA05226A

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