Cation-Deficient Spinel ZnMn2O4 Cathode in Zn (CF3SO3)2 Electrolyte for Rechargeable Aqueous Zn-Ion Battery

DOI number:10.1021/jacs.6b05958

Journal:J. Am. Chem. Soc.

Key Words:IN-SALT ELECTROLYTE;LITHIUM BATTERIES;CYCLING STABILITY;ZINC BATTERIES;MANGANESE;OXIDE;OXYGEN;PERFORMANCE;MAGNESIUM;INSERTION

Abstract:Rechargeable aqueous Zn-ion batteries are attractive cheap, safe and green energy storage technologies but are bottlenecked by limitation in high-capacity cathode and compatible electrolyte to achieve satisfactory cyclability. Here we report the application of nonstoichiometric ZnMn2O4/carbon composite as a new Zn-insertion cathode material in aqueous Zn(CF3SO3)2 electrolyte. In 3 M Zn(CF3SO3)2 solution that enables ∼100% Zn plating/stripping efficiency with long-term stability and suppresses Mn dissolution, the spinel/carbon hybrid exhibits a reversible capacity of 150 mAh g–1 and a capacity retention of 94% over 500 cycles at a high rate of 500 mA g–1. The remarkable electrode performance results from the facile charge transfer and Zn insertion in the structurally robust spinel featuring small particle size and abundant cation vacancies, as evidenced by combined electrochemical measurements, XRD, Raman, synchrotron X-ray absorption spectroscopy, FTIR, and NMR analysis. The results would enlighten and promote the use of cation-defective spinel compounds and trifluoromethanesulfonic electrolyte to develop high-performance rechargeable zinc batteries.

Co-author:Yongchang Liu, Qing Zhao, Kaixiang Lei, Chengcheng Chen, Xiaosong Liu, Jun Chen

First Author:Ning Zhang

Correspondence Author:Fangyi Cheng

Volume:138

Issue:39

Page Number:12894-12901

ISSN No.:0002-7863

Translation or Not:no

Date of Publication:2016-09-14

Links to published journals:https://pubs.acs.org/doi/10.1021/jacs.6b05958