26August2019

Nano-Micro Letters

V2O5 Nanospheres with Mixed Vanadium Valences as High Electrochemically Active Aqueous Zinc-ion Battery Cathode

Fei Liu1, Zixian Chen1, Guozhao Fang1, Ziqing Wang1, Yangsheng Cai1, Boya Tang1, Jiang Zhou1, 2, *, Shuquan Liang1, 2, *

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Nano-Micro Lett. (2019) 11: 25

First Online: 22 March 2019 (Article)

DOI:10.1007/s40820-019-0256-2

*Corresponding author. E-mail: zhou_jiang@csu.edu.cn (Jiang Zhou); lsq@csu.edu.cn (Shuquan Liang)

 

Abstract

 


Toc

A V4+-V2O5 cathode with mixed vanadium valences was prepared via a novel synthetic method using VOOH as the precursor and its zinc ion storage performance was evaluated. The products are hollow spheres consisting of nanoflakes. The V4+-V2O5 cathode exhibits a prominent cycling performance, with a specific capacity of 140 mAh g-1 after 1000 cycles at 10 A g-1, and an excellent rate capability. The good electrochemical performance is attributed to the presence of V4+, which leads to higher electrochemical activity, lower polarization, faster ion diffusion, and higher electrical conductivity than V2O5 without V4+. This engineering strategy of valence state manipulation may pave the way for designing high-performance cathodes for elucidating advanced battery chemistry.


 

Keywords

V2O5; Mixed valences; Hollow sphere; Long-cycle-life; Cathode; Aqueous zinc-ion battery

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