δ-VOPO4 as a high-voltage cathode material for aqueous zinc-ion batteries

被引:24
作者
Zhao, Dong [1 ]
Pu, Xiangjun [2 ]
Tang, Shenglong [1 ]
Ding, Mingyue [1 ]
Zeng, Yubin [1 ]
Cao, Yuliang [2 ]
Chen, Zhongxue [1 ]
机构
[1] Wuhan Univ, Sch Power & Mech Engn, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
基金
中国国家自然科学基金;
关键词
PERFORMANCE; VOPO4;
D O I
10.1039/d3sc02382f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Aqueous zinc-ion batteries (AZIBs) with excellent safety, low-cost and environmental friendliness have great application potential in large-scale energy storage systems and thus have received extensive research interest. Layered oxovanadium phosphate dihydrate (VOPO4 & BULL;2H(2)O) is an appealing cathode for AZIBs due to the unique layered framework and desirable discharge plateau, but bottlenecked by low operation voltage and unstable cycling. Herein, we propose delta-oxovanadium phosphate (& delta;-VOPO4) without conventional pre-embedding of metal elements or organics into the structure and paired it into AZIBs for the first time. Consequently, superior to the layered counterpart, & delta;-VOPO4 exhibits better performance with a prominent discharge voltage of 1.46 V and a higher specific capacity of 122.6 mA h g(-1) at 1C (1C = 330 mA g(-1)), as well as an impressive capacity retention of 90.88 mA h g(-1) after 1000 cycles under 10C. By investigation of structure resolution and theoretical calculation, this work well elucidates the structure-function relationship in vanadyl phosphates, offering more chances for exploration of new cathode materials to construct high performance AZIBs.
引用
收藏
页码:8206 / 8213
页数:8
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