Xia Dawei, Wang Dongdong, Liu Wenlong, Gong Feng
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China.
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, P. R. China.
Chem Asian J. 2021 Apr 1;16(7):775-782. doi: 10.1002/asia.202001450. Epub 2021 Feb 15.
Vanadates have received booming attention recently as promising materials for extensive electrochemical devices such as batteries and electrocatalysis. However, the enormous difficulties of achieving pure-phase transition metal vanadates, especially for nickel-based, hinder their exploitations. Herein, for the first time, by controlling the amount of ethylene glycol (EG) and reaction time, grape-like Ni V O (or V O /Ni V O ) microspheres were rationally fabricated. It is demonstrated that the EG can chelate both Ni and VO to form organometallic precursors. As anode in lithium-ion batteries (LIBs), it could deliver superior reversible capacity of 1050 mAh/g at 0.1 A/g and excellent rate capability of 600 mAh/g at 4 A/g. The facile hydrothermal synthesis broadens the material variety of nickel vanadates and offers new opportunities for their wider applications in electrochemistry.
钒酸盐作为用于电池和电催化等广泛电化学装置的有前景的材料，近来受到了广泛关注。然而，实现纯相过渡金属钒酸盐，尤其是镍基钒酸盐存在巨大困难，这阻碍了它们的开发利用。在此，首次通过控制乙二醇（EG）的用量和反应时间，合理制备出了葡萄状的NiVO（或VO/NiVO）微球。结果表明，EG能够螯合Ni和VO形成有机金属前驱体。作为锂离子电池（LIBs）的负极，在0.1 A/g电流密度下，其可逆比容量可达1050 mAh/g，在4 A/g电流密度下，倍率性能优异，比容量为600 mAh/g。这种简便的水热合成方法拓宽了镍钒酸盐的材料种类，并为其在电化学领域的更广泛应用提供了新机遇。
