Issue 4, 2023

Improved electrode reversibility of anionic redox with highly concentrated electrolyte solution and aramid-coated polyolefin separator

Abstract

High-capacity electrode materials made of abundant elements are necessary to develop cost-effective energy storage applications. An emerging new chemistry has involved a series of electrode materials with a cation-disordered rock salt structure, and Li-excess and Mn-based oxides with disordered structures are attractive candidates for this purpose. Large reversible capacities for these electrode materials are obtained through both cationic/anionic redox. However, cyclability associated with insufficient reversibility of anionic redox in carbonate-based electrolyte solutions is not acceptable for practical applications. Herein, a significant improvement of electrode reversibility was achieved with highly concentrated electrolyte consisting of LiN(SO2F)2 and dimethyl carbonate. A practical problem when using high-viscosity concentrated electrolyte, i.e., non-wettability of concentrated electrolyte to polyolefin separators with small pores, was also effectively solved by using an aramid-coated polyolefin membrane. The improvement of reversibility for anionic redox associated with the suppression of oxygen loss, was clearly demonstrated by the results of X-ray absorption spectroscopy of nanosized Li1.14Ti0.29Mn0.57O2 with the concentrated electrolyte solution and aramid-coated separator. These findings have shown the future possibility of developing applications of high-energy batteries without ions of non-abundant nickel/cobalt.

Graphical abstract: Improved electrode reversibility of anionic redox with highly concentrated electrolyte solution and aramid-coated polyolefin separator

Supplementary files

Article information

Article type
Communication
Submitted
08 2 2023
Accepted
02 3 2023
First published
03 3 2023
This article is Open Access
Creative Commons BY license

Energy Adv., 2023,2, 508-512

Improved electrode reversibility of anionic redox with highly concentrated electrolyte solution and aramid-coated polyolefin separator

N. Shimada, Y. Ugata, S. Nishikawa, D. Shibata, T. Ohta and N. Yabuuchi, Energy Adv., 2023, 2, 508 DOI: 10.1039/D3YA00066D

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