期刊
ENERGY STORAGE MATERIALS
卷 21, 期 -, 页码 154-161出版社
ELSEVIER
DOI: 10.1016/j.ensm.2018.12.019
关键词
ZnMn2O4; Oxygen anions; Defect; Zn2+ storage; Flexible Zn-ion batteries
资金
- National Natural Science Foundation of China [21822509, U1810110, 31530009]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2014A030306048]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2015TQ01C205]
- Pearl River S & T Nova Program of Guangzhou [201610010080]
- Fundamental Research Funds for the Central Universities [17lgzd16]
- Alexander von Humboldt Foundation
- Training Program of Scientific and Technological Innovation for Undergraduates [pdjh2017a0003]
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 0.5mA 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 273.4Wh 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.
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