Structure Rearrangement and V(IV) Doping for V2O5 as Ultralong-Life and Ultrahigh-Rate Cathode in Aqueous Zinc-Ion Batteries

Structure Rearrangement and V(IV) Doping for V2O5 as Ultralong-Life and Ultrahigh-Rate Cathode in Aqueous Zinc-Ion Batteries
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V2O5 的结构重排和 V(IV) 掺杂作为水系锌离子电池超长寿命和超高倍率正极

DOI:
10.1149/2.0931912jes
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发表时间:
2019-08
影响因子:
3.9
通讯作者:
Chen Han
Chen Han
中科院分区:
工程技术4区
文献类型:
--
作者:
Chen Yueqian;Xiang Kaixiong;Zhu Yirong;Xiao Li;Chen Wenhao;Liao Haiyang;Chen Xianhong;Chen Han

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为了提高商用V 2 O 5 的电化学性能,通过草酸还原剂耦合简便的水热工艺对其结构进行重新排列并同时掺杂同质和低价V (IV) 离子,成功获得V 2 O 5 纳米片。利用X射线衍射、X射线光电子能谱、扫描电子显微镜和透射电子显微镜对材料进行了表征。经过结构重排和V(IV)掺杂后,V 2 O 5 纳米片表现出更大的晶格参数和更小的晶粒尺寸,但结构更稳定。与商用V 2 O 5 相比,V 2 O 5 纳米片在0.2 A g− 1 电流密度下表现出230.7 mAh g− 1 的更高比容量,在5 A g− 1 电流密度下表现出216.3 mAh g− 1 的更高比容量,并在1000次循环后保持87.8%(189.8 mAh g− 1)的更优异的容量保持率。这些结果表明结构重排和V(IV)掺杂可以极大地改善商业V 2 O 5 的结构和性能。
To improve the electrochemical performance of commercial V 2 O 5, its structures are rearranged and simultaneously doped by coessential and low-valence V (IV) ions via the oxalic acid reductant coupled facile hydrothermal process to achieve successfully V 2 O 5 nanosheets. The materials were characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. After the structural rearrangement and V (IV)-doping, V 2 O 5 nanosheets exhibit bigger lattice parameters and smaller grain size, but more stable structure. Compared to the commercial V 2 O 5, V 2 O 5 nanosheets reveal the higher specific capacity of 230.7 mAh g− 1 at the current density of 0.2 A g− 1 and the higher rate capacity of 216.3 mAh g− 1 at the current density of 5 A g− 1, maintain the more excellent capacity retention of 87.8%(189.8 mAh g− 1) after 1000 cycles. These results indicate the structural rearrangement and V (IV) doping can greatly improve the structure and performance for commercial V 2 O 5.
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