Liu Fei, Chen Zixian, Fang Guozhao, Wang Ziqing, Cai Yangsheng, Tang Boya, Zhou Jiang, Liang Shuquan
School of Materials Science and Engineering, Central South University, Changsha, 410083, Hunan, People's Republic of China.
Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083, Hunan, People's Republic of China.
Nanomicro Lett. 2019 Mar 22;11(1):25. doi: 10.1007/s40820-019-0256-2.
A V-VO 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 V-VO cathode exhibits a prominent cycling performance, with a specific capacity of 140 mAh g after 1000 cycles at 10 A g, and an excellent rate capability. The good electrochemical performance is attributed to the presence of V, which leads to higher electrochemical activity, lower polarization, faster ion diffusion, and higher electrical conductivity than VO without V. This engineering strategy of valence state manipulation may pave the way for designing high-performance cathodes for elucidating advanced battery chemistry.
通过一种以VOOH为前驱体的新型合成方法制备了具有混合钒价态的V-VO阴极，并对其锌离子存储性能进行了评估。产物为纳米片组成的空心球。V-VO阴极表现出卓越的循环性能，在10 A g下循环1000次后比容量为140 mAh g，且具有出色的倍率性能。良好的电化学性能归因于V的存在，这导致其比不含V的VO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。这种价态调控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。
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