Issue 29, 2023

The effect of electrochemically active element species on the stability of the layered cathode–sulfide electrolyte interface

Abstract

Layered cathode materials are widely used in conventional lithium-ion batteries with liquid electrolytes. From LiCoO2 (LCO) to Ni-rich (LiNixCoyMnzAl1−xyzO2, x ≥ 0.8) materials, different electrochemically active elements bring various properties to the cathodes and therefore they are employed in different fields. Although these layered material systems, composed of different transition metals (TMs), have been intensively studied, their electrochemical properties and interfacial stabilities when paired with promising sulfide solid electrolytes have not been systematically explored. Here, excluding the interference of redundant TMs, we prepared LiNixCo1−xO2 in an attempt to reveal the laws of reactivity at the interface between the layered cathode and the sulfide electrolyte. As a result of systematic analysis, overall, both chemical and electrochemical adverse reactions are proven to be aggravated with the increasing Ni/Co proportion. Compared to that when paired with liquid electrolytes, materials with a high Ni content exhibit much inferior electrochemical stability when paired with sulfide solid electrolytes. The introduction of Co enhances the interfacial stability, whereas the effect becomes less pronounced when the Co content in the system is half or more. This fundamental work deepens the insight into cathode/electrolyte interface deterioration and serves as a guide for designing an appropriate cathode for the up-and-coming all-solid-state lithium batteries (ASSLBs).

Graphical abstract: The effect of electrochemically active element species on the stability of the layered cathode–sulfide electrolyte interface

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2023
Accepted
15 Jun 2023
First published
15 Jun 2023

New J. Chem., 2023,47, 13646-13654

The effect of electrochemically active element species on the stability of the layered cathode–sulfide electrolyte interface

Y. Sun, S. Li, K. Yang, Y. Ma, H. Zhang, D. Song, Y. Wang, C. Li, D. Wang and L. Zhang, New J. Chem., 2023, 47, 13646 DOI: 10.1039/D3NJ01505J

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