Extracting oxygen anions from ZnMn2O4: Robust cathode for flexible all-solid-state Zn-ion batteries

By Haozhe Zhang, Jing Wang, Qiyu Liu, Wanyi He, Zhengzhe Lai, Xinyue Zhang, Minghao Yu, Y. Tong, Xihong Lu. Energy Storage Materials, 2019

253 citations recorded by the source corpus.

Abstract The pursuit of superb aqueous Zn-ion batteries (ZIBs) has driven the focus on solving their cathode limit. This study provides a readily accessible approach toward designing high-capacity ZnMn2O4 cathode by extracting oxygen anions. Experimental and computational results revealed the electronic conductivity, the Zn2+ diffusion kinetics, and the energy barrier of Zn mobility were well tailored by oxygen defects. The fabricated oxygen-deficient ZnMn2O4 cathode with the structural protection of conductive poly (3, 4-ethylenedioxythiophene) exhibited an outstanding capacity of 221 mA h g−1 at 0.5 mA cm−2, representing a state-of-the-art of current ZIBs cathodes. Moreover, a flexible and all-solid-state ZIBs was demonstrated, which delivered a superior energy density of 273.4 W h kg−1. Considering the new understanding about oxygen defects and the innovative concept of flexible ZIBs, this study is hoped to provide insightful guide for eco-friendly and portable energy storage systems.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/519bf73e080984e334e2462f8e94d8d4b6acd3e7