Deng Leqing, Chen Lilin, Wang Shuaiqi, Wang Siying, Hu Qingsong, Li Qiangwei, Wang Lidong
Institute of Energy Power Innovation, North China Electric Power University, Beijing, 102206, P. R. China.
MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, P. R. China.
Small. 2025 Jun;21(25):e2503839. doi: 10.1002/smll.202503839. Epub 2025 Apr 27.
Layered vanadates are promising cathode materials for aqueous zinc-ion batteries (AZIBs). Herein, a layered potassium vanadate KVO is reported as a promising cathode material for AZIBs. It provides a high reversible capacity of 471.1 mAh g with unprecedent cycle life at a harsh low rate of 0.21 C (90.2% capacity retention after 400 cycles, running time 150 days), remarkable rate capability and decent long-term cycling stability (no capacity decay after 1700 cycles). According to a series of tests, it is revealed that the energy storage mechanism of KVO involves initial extraction of K followed by subsequent (de)intercalation of Zn/H, in which the concomitant structure change and chemical state transition of vanadium possess high reversibility. Moreover, KVO exhibits rapid Zn/H ion diffusion, favoring its rate capability. Additionally, KVO also demonstrates excellent low-temperature adaptability, which can operate stably at -30 °C. The excellent electrochemical performance, facile preparation, and low cost of KVO promise it as an attractive cathode candidate for practical AZIBs.
层状钒酸盐是水系锌离子电池（AZIBs）很有前景的正极材料。在此，报道了一种层状钒酸钾KVO作为AZIBs很有前景的正极材料。它在0.21 C的苛刻低倍率下提供了471.1 mAh g的高可逆容量以及前所未有的循环寿命（400次循环后容量保持率90.2%，运行时间150天）、出色的倍率性能和良好的长期循环稳定性（1700次循环后无容量衰减）。根据一系列测试表明，KVO的储能机制涉及K的初始脱出，随后是Zn/H的（脱）嵌入，其中钒伴随的结构变化和化学状态转变具有高可逆性。此外，KVO表现出快速的Zn/H离子扩散，有利于其倍率性能。此外，KVO还表现出优异的低温适应性，可在-30°C下稳定运行。KVO优异的电化学性能、简便的制备方法和低成本使其有望成为实用AZIBs极具吸引力的正极候选材料。
