Fang Yixing, Chen Yilan, Zeng Lingxing, Yang Tao, Xu Qinxin, Wang Yiyi, Zeng Shihan, Qian Qingrong, Wei Mingdeng, Chen Qinghua
Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China.
Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, Fujian 350007, China; Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China.
J Colloid Interface Sci. 2021 Jul;593:251-265. doi: 10.1016/j.jcis.2021.02.108. Epub 2021 Mar 9.
In this work, we fabricated vanadium/zinc metal-organic frameworks (V/Zn-MOFs) derived from self-assembled metal organic frameworks, to further disperse ultrasmall ZnVO nanoparticles and encapsulate them in a nitrogen-doped nanocarbon network (ZVO/NC) under in situ pyrolysis. When employed as an anode for lithium-ion batteries, ZVO/NC delivers a high reversible capacity (807 mAh g at 0.5 A g) and excellent rate performance (372 mAh g at 8.0 A g). Meanwhile, when used in sodium-ion batteries, it exhibits long-term cycling stability (7000 cycles with 145 mAh g at 2.0 A g). Additionally, when employed in potassium-ion batteries, it also shows outstanding electrochemical performance with reversible capacities of 264 mAh g at 0.1 A g and 140 mAh g at 0.5 A g for 1000 cycles. The mechanism by which the pseudocapacitive behaviour of ZVO/NC enhances battery performance under a suitable electrolyte was probed, which offers useful enlightenment for the potential development of anodes of alkali-ion batteries. The performance of ZnVO as an anode for SIBs/PIBs was investigated for the first time. This work provides a new horizon in the design ZVO/NC as a promising anode material owing to the intrinsically synergic effects of mixed metal species and the multiple valence states of V.
在这项工作中，我们制备了源自自组装金属有机框架的钒/锌金属有机框架（V/Zn-MOFs），以进一步分散超小的ZnVO纳米颗粒，并在原位热解过程中将它们封装在氮掺杂的纳米碳网络（ZVO/NC）中。当用作锂离子电池的阳极时，ZVO/NC具有高可逆容量（在0.5 A g下为807 mAh g）和优异的倍率性能（在8.0 A g下为372 mAh g）。同时，当用于钠离子电池时，它表现出长期循环稳定性（在2.0 A g下循环7000次，容量为145 mAh g）。此外，当用于钾离子电池时，它也表现出出色的电化学性能，在0.1 A g下可逆容量为264 mAh g，在0.5 A g下1000次循环的可逆容量为140 mAh g。研究了ZVO/NC在合适电解质下赝电容行为增强电池性能的机制，这为碱离子电池阳极的潜在发展提供了有益的启示。首次研究了ZnVO作为SIBs/PIBs阳极的性能。由于混合金属物种的内在协同效应和V的多价态，这项工作为设计ZVO/NC作为有前景的阳极材料提供了新的视角。
