期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 615, 期 -, 页码 184-195出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.01.155
关键词
In situ construction; Vanadium pentoxide; Ball-in-ball; Void space; Aqueous zinc-ion batteries
资金
- National Natural Science Foun-dation of China [51872226, 52002320, 51972267]
- Natural Science Foundation of Shaanxi Province [2020GY-293, 2021GY-153]
- Industrial Projects Foundation of Ankang Science and Technology Bureau [AK2020-GY02-2]
- Merit-based Projects Foundation of Department of Human Resources and Social Security of Shaanxi Province for Returned Overseas Personnel [2019RS-37]
The research demonstrates that using ball-in-ball structured porous V2O5 wrapped with carbon fibers as the cathode material for aqueous zinc-ion batteries exhibits improved electrochemical performance, including enhanced specific capacity, cyclic stability, rate ability, and energy density.
Hypothesis: Using V2O5 as an aqueous zinc-ion battery (ZIB) cathode has major drawbacks, including inferior electrode/electrolyte contact interfaces, morphological and structural deterioration, and unsatisfactory conductivity. Purposeful construction of ball-in-ball structured V2O5 with porous and void archi-tectures wrapped with carbon fibers is expected to overcome the drawbacks, thus bringing the electrochemical performance of V2O5 into full play. Experiments: In situ construction of ball-in-ball structured porous V2O5 wrapped by intertwined carbon fibers (V2O5@void@V2O5@CFs) is implemented through a simple combined hydrothermal and calcination route. A combination of in/ex situ analytical methods and density functional theoretical calculations are performed to clarify the energy storage mechanism of the material for aqueous ZIBs. Findings: The reversible reaction to generate ZnxV2O5.nH(2)O executes during the zinc ion insertion/extraction procedure in V2O5@void@V2O5@CFs. Benefitting from the synergistic effect of the porous ball-in-ball structure with void space and the wrapped CFs, the material exhibits boosted specific capacity (455 mAh g(-1) after 100 cycles and 149 mAh g(-1) after 2000 cycles at 4 and 25 A g(-1), respectively), cyclic stability, rate ability and energy density (355 Wh kg(-1) at 739 W kg(-1)) when used for aqueous ZIBs due to improved capacitive contribution, fast zinc ion transport dynamics, and enhanced conductivity. (c) 2022 Elsevier Inc. All rights reserved.
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