Journal
ACS NANO
Volume 16, Issue 9, Pages 14539-14548Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c04968
Keywords
coating layer; MXene; heterostructure; suppressing dissolution; aqueous zinc-ion batteries
Categories
Funding
- National Natural Science Foundation of China [U2004212, 51902251]
- State Key Laboratory of Organic - Inorganic Composites [oic- 202101010]
- Natural Science Basic Research Project of Shaanxi Province [2022JQ-123]
- Natural Science Foundation of Shaanxi Provincial Department of Education [20JK0753]
- Provincial Joint Fund of Shaanxi [2021JLM-28]
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The design of a Ti3C2Tx MXene layer on V2O5 nanoplates surface in VPMX materials can suppress vanadium dissolution, improve host electrochemical kinetics, and facilitate interfacial Zn 2+ diffusion with the help of lubricated water molecules, leading to enhanced rate capability for AZIBs.
Aqueous zinc-ion batteries (AZIBs) are attractive energy storage devices that benefit from improved safety and negligible environmental impact. The V2O5-based cathodes are highly promising, but the dissolution of vanadium is one of the major challenges in realizing their stable performance in AZIBs. Herein, we design a Ti3C2Tx MXene layer on the surface of V2O5 nanoplates (VPMX) through a van der Waals self-assembly approach for suppressing vanadium dissolution during an electrochemical process for greatly boosting the zinc-ion storage performance. Unlike conventional V2O5/C composites, we demonstrate that the VPMX hybrids offer three distinguishable features for achieving high-performance AZIBs: (i) the MXene layer on cathode surface maintains structural integrity and suppresses V dissolution; (ii) the heterointerface between V2O5 and MXene enables improved host electrochemical kinetics; (iii) reduced electrostatic repulsion exists among host layers owing to the lubricating water molecules in the VPMX cathode, facilitating interfacial Zn 2+ diffusion. As a result, the as-made VPMX cathode shows a long-term cycling stability over 5000 cycles, surpassing other reported V2O5-based materials. Especially, we find that the heterointerface between V2O5 and MXene and lubricated water molecules in the host can achieve an enhanced rate capability (243.6 mAh g(-1) at 5.0 A g(-1)) for AZIBs.
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