Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 9, Pages 11654-11662Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c00001
Keywords
aqueous zinc ion battery; VOx electrode; cathode materials; energy storage device; mechanical stability
Funding
- National Natural Science Foundation of China [52172218]
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This study reports the use of carbon-encapsulated VOx microspheres, grown by controlling the calcination temperature, as ideal cathode materials for aqueous zinc ion batteries. These batteries exhibit high specific capacity and reversible rate performance, and also demonstrate favorable mechanical and cycle stability.
Aqueous zinc ion batteries show tremendous potential in emerging energy storage devices. However, it is challenging to explore the desired cathode materials that match well with the Zn anode. In this work, we report two kinds of carbon-encapsulated VOx microspheres grown by controlling the calcination temperature. The assembled Zn/VO2@C-0.5 batteries deliver a high specific capacity and reversible rate performance. They can still maintain 260 mA h g(-1) at 5 A g(-1) after 1000 cycles. In addition, the cells possess an energy density of 280 W h kg(-1) at a power density of 140 W kg(-1). The soft pack devices also show favorable mechanical stability and durable cycle ability. The excellent zinc ion storage capacity can be attributed to the large tunnel structure of VO2 materials and the high conductivity of amorphous carbon.
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