期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 37, 页码 44379-44388出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c12653
关键词
zinc cathode; hydrated vanadium dioxide; oxygen vacancy defects; aqueous batteries; hydrogel electrolytes
资金
- Joint Fund Project of Guangdong and Guangxi [2020A1515410008]
- Science and Technology Program of Guangzhou [2019050001]
- Scientific and Technological Plan of Guangdong Province [2018B050502010, 2019B090905005]
- Guangxi Innovation-Driven Science and Technology Major Special Project [AA17204022]
This study focuses on a new type of 3D spongy hydrated vanadium dioxide composite with superior electrochemical performance in aqueous electrolyte, which is further applied in flexible zinc ion batteries, demonstrating excellent flexibility and cycling stability.
Zinc ion batteries have become a new type of energy storage device because of the low cost and high safety. Among the various cathode materials, vanadium-oxygen compounds stand out due to their high theoretical capacity and variable chemistry valence state. Here, we construct a 3D spongy hydrated vanadium dioxide composite (O-d-HVO/rG) with abundant oxygen vacancy defects and graphene modifications. Thanks to the stable structure and abundant active sites, O-d-HVO/rG exhibits superior electrochemical properties. In aqueous electrolyte, the O-d-HVO/rG cathode provides high initial charging capacity (428.6 mAh/g at 0.1 A/g), impressive rate performance (186 mAh/g even at 20 A/g), and cycling stability, which can still maintain 197.5 mAh/g after 2000 cycles at 10 A/g. Also, the superior specific energy of 245.3 Wh/kg and specific power of 14142.7 W/kg are achieved. In addition, MXene/O-d-HVO/rG cathode materials are prepared and PAM/ZnSO4 hydrogel electrolytes are applied to assemble flexible soft pack quasi-solid-state zinc ion batteries, which also exhibit excellent flexibility and cycling stability (206.6 mAh/g after 2000 cycles). This work lays the foundation for advances in rechargeable aqueous zinc ion batteries, while revealing the potential for practical applications of flexible energy storage devices.
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