Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 868, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159131
Keywords
Lithium-sulfur batteries; V2O5; Vice-electrode; Large voltage window; Shuttle effect
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Funding
- National Natural Science Foundation of China [11674138]
- Fundamental Research Funds for the Central Universities [lzujbky-2020-cd02]
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By developing a new strategy to construct V2O5 yolk-shell microspheres/graphene nanosheets on a commercial poly-propylene separator as a vice-electrode, the lithium-sulfur batteries show a larger voltage window and significantly improved electrochemical performance.
To improve the electrochemical performance of lithium-sulfur (Li-S) batteries, we develop a new strategy to construct the V2O5 yolk-shell microspheres/graphene nanosheets (V2O5/G) layer on commercial poly-propylene (PP) separator as a vice-electrode. On one hand, the V2O5/G interlayer can act as a barrier to block polysulfides diffusion and then suppress the troublesome shuttle effect. On the other hand, lithium ions can insert in and extract from V2O5 during discharge/charge processes, and thus contribute extra cathode capacity and large voltage window to the batteries. As expected, the Li-S batteries with a V2O5/G interlayer deliver a large voltage window of 2.0 V (3.6-1.6 V) and a significantly improved electrochemical performance. The work provides a new idea for the design of the high-performance Li-S battery. (C) 2021 Elsevier B.V. All rights reserved.
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