V(2)O(5) Nanospheres with Mixed Vanadium Valences as High Electrochemically Active Aqueous Zinc-Ion Battery Cathode.

V(2)O(5) Nanospheres with Mixed Vanadium Valences as High Electrochemically Active Aqueous Zinc-Ion Battery Cathode.
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混合钒价 V2O5 纳米球作为高电化学活性水系锌离子电池正极

DOI:
10.1007/s40820-019-0256-2
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发表时间:
2019-03-22
期刊:
影响因子:
26.6
通讯作者:
Liang S
Liang S
中科院分区:
材料科学1区
文献类型:
--
作者:
Liu F;Chen Z;Fang G;Wang Z;Cai Y;Tang B;Zhou J;Liang S

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以VOOH为前驱体,采用一种新的合成方法制备了混合钒价态的V4+-V2 O 5正极材料,并对其锌离子储存性能进行了评价。产物是由纳米片组成的空心球。V4+-V2 O 5阴极表现出突出的循环性能,在10 A g−1下1000次循环后的比容量为140 mAh g−1,并且具有优异的倍率性能。由于V4+的存在,V2 O 5具有更高的电化学活性、更低的极化、更快的离子扩散和更高的电导率。这种价态操纵的工程策略可能为设计用于阐明先进电池化学的高性能阴极铺平道路。
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.
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