Journal
ACS NANO
Volume 14, Issue 6, Pages 6752-6760Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b10214
Keywords
aqueous Zn-ion batteries; potassium vanadate; composite film; long life; flexible devices
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Funding
- National Key R&D Program of China [2019YFA0705600, 2017YFA0206701]
- National Natural Science Foundation of China [51822205, 21875121]
- China Postdoctoral Science Foundation [2019M650045, 2019M660056]
- Ministry of Education of China [B12015]
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Among various energy storage devices, aqueous zinc-ion batteries (ZIBs)have captured great attention due to their high safety and low cost. One of the most promising cathodes of aqueous ZIBs is layered vanadium-based compounds. However, they often suffer from the capacity decaying during cycling. Herein, we prepared KV3O8 center dot 0.75H(2)O (KVO) and further incorporated it into a single-walled carbon nanotube (SWCNT) network, achieving freestanding KVO/SWCNT composite films. The KVO/SWCNT cathodes exhibit a Zn2+/H+ insertion/extraction mechanism, resulting in fast kinetics of ion transfer. In addition, the KVO/SWCNT composite films possess a segregated network structure, which offers the fast kinetics of electron transfer and guarantees an intimate contact between KVO and SWCNTs during cycling. As a result, the resultant batteries deliver a high capacity of 379 mAh g(-1), excellent rate capability, and an ultralong cycle life up to 10,000 cycles with a high capacity retention of 91%. In addition, owing to the high conductivity and flexibility of KVO/SWCNT films, flexible soft-packaged ZIBs based on KVO/SWCNT film cathodes were assembled and displayed stable electrochemical performance at different bending states.
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