期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 11, 期 9, 页码 2521-2530出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ee01415a
关键词
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资金
- NSFC/RGC [N_CityU123/15]
- City University of Hong Kong [PJ7004645, 9610372]
- Science & Technology Department of Sichuan Province [2017JY0088]
- Chengdu Research Institute [2017JY0088]
The Zn/Co3O4 battery is one of the few aqueous electrolyte batteries with a potential > 2 V voltage. Unfortunately, so far, all reported Zn/Co3O4 batteries are using an alkaline electrolyte, resulting in poor cycling stability and environmental problems. Here, we report a Co(III) rich-Co3O4 nanorod material with vastly improved electrochemical kinetics. Zn/Co(III) rich-Co3O4 batteries can work well in ZnSO4 with a CoSO4 additive aqueous solution as a mild electrolyte, delivering a high voltage of 2.2 V, a capacity of 205 mA h g(-1) (Co3O4) and an extreme cycling stability of 92% capacity retention even after 5000 cycles. Further mechanistic study reveals a conversion reaction between in situ formed CoO and Co3O4, which has never been observed in an alkaline Zn/Co3O4 battery. Subsequently, a flexible solid-state battery is constructed and reveals high flexibility and a high energy density of 360.8 W h kg(-1) at a current density of 0.5 A g(-1). Our research initiates the first Zn/Co3O4 battery working in a mild electrolyte, resulting in excellent electrochemical performance. It also indicates that the electrochemical kinetics can be effectively enhanced by fine tuning the atomic structure of electrode materials, opening a new door to improve the performance of aqueous electrolyte batteries.
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