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Highly reversible lithium storage in conversion-type ZnCo2O4 anode promoted by NiCl2-xFx hydrate

Abstract

Transition metal oxides are important conversion-type anodes in lithium ion batteries because of their low cost and high specific capacity. However, the poor conversion-reaction reversibility leads to low Coulombic efficiency, sluggish reaction kinetics and unsatisfying long-term cycling stability, thus severely hinders their practical applications. In this research, we proposed a facile strategy to achieve highly reversible lithium storage in ZnCo2O4 anode by coating ultrafine NiCl2-xFx hydrate on porous ZnCo2O4 microspheres. The intimate and well-distributed contact between two components significantly enhances the activity of the reversible conversion reaction. The NiCl2-xFx hydrate also promotes the reversible decomposition of organic components in as-formed solid electrolyte interface, evidenced from several microstructural analyses. Moreover, the ultrafine hydrated NiCl2-xFx effectively pins ZnCo2O4 to inhibit the detrimental grain coarsening process during cycling. As a result, the hybrid anode shows significantly increased initial Coulombic efficiency from 69.1% to 83%, and the round-trip energy efficiency from 50% to 58.7%. It also demonstrates excellent rate capability and superior cycling stability.

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Supplementary files

Article information


Submitted
02 Dec 2019
Accepted
12 Jan 2020
First published
15 Jan 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Communication

Highly reversible lithium storage in conversion-type ZnCo2O4 anode promoted by NiCl2-xFx hydrate

J. Deng, X. Yu, J. Tang, L. Zhang, K. Zhang, S. Lin and B. Li, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA13183C

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