Journal
ACS NANO
Volume 14, Issue 11, Pages 15776-15785Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c06834
Keywords
zinc-ion battery; magnesium vanadate cathode; concentrated gel electrolyte; high-performance; wide-temperature; reaction mechanism
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Funding
- Shenzhen Science and Technology Innovation Commission [JCYJ20180504165506495, JCYJ20170818085823773]
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Aqueous zinc-ion batteries (ZIBs) have emerged as the most promising alternative energy storage system, but the development of a suitable cathode and the issues of Zn anodes have remained challenging. Herein, an effective strategy of high-capacity layered Mg0.1V2O5 center dot H2O (MgVO) nanobelts together with a concentrated 3 M Zn(CF3SO3)(2) polyacrylamide gel electrolyte was proposed to achieve a durable and practical ZIB system. By adopting the designed concentrated gel electrolyte which not only inherits the high-voltage window and wide operating temperature of the concentrated electrolyte but also addresses the Zn dendrite formation problem, the prepared cathode exhibits an ultrahigh capacity of 470 mAh g(-1) and a high rate capability of 345 mAh g(-1) at 5.0 A g(-1), and the assembled quasi-solid-state ZIBs achieve 95% capacity retention over 3000 cycles as well as a wide operating temperature from -30 to 80 degrees C, demonstrating a promising prospect for large-scale energy storage. In situ X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis (TGA) investigations also demonstrate a complex reaction mechanism for this cathode involving the (de)insertion of Zn2+, H+, and water molecules during cycling. The water molecules will reinsert into the interlayer and act as pillars to stabilize the host structure when Zn2+ is fully extracted.
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