Feng Ziyi, Zhang Yifu, Zhao Yunfeng, Sun Jingjing, Liu Yanyan, Jiang Hanmei, Cui Miao, Hu Tao, Meng Changgong
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.
Nanoscale. 2022 Jun 23;14(24):8776-8788. doi: 10.1039/d2nr02122f.
Possessing a 2D zinc-ion transport channel, layered vanadium oxides have become good candidates as cathode materials for aqueous rechargeable zinc-ion batteries (ARZIBs). Tuning the lamellar structure of vanadium oxides to enhance their zinc-ion storage is a great challenge. In the present study, we proposed and investigated a "co-intercalation mechanism" in which Mg and polyaniline (PANI) were simultaneously intercalated into the layers of hydrated VO (MgVOH/PANI) by a one-step hydrothermal method. Inorganic-organic co-intercalation could tune the layer spacing of VOH, and this combination played a synergistic role in enhancing the zinc-ion storage in MgVOH/PANI. It showed an extremely large layer spacing of 14.2 Å, specific capacity of up to 412 mA h g at 0.1 A g, and the capacity retention rate could reach 98% after 1000 cycles. PANI itself has a zinc-storage capacity, and Mg intercalated with PANI can improve the conductivity of the material and enhance its stability. Further first-principles calculations clearly revealed the structural changes and improved electrochemical performance of vanadium oxides. This method of inorganic and organic co-regulation of the VOH structure opens a new strategy for tuning the lamellar structure of layered materials to boost their electrochemical performances.
层状钒氧化物具有二维锌离子传输通道，已成为水系可充电锌离子电池（ARZIBs）正极材料的理想候选者。调节钒氧化物的层状结构以增强其锌离子存储能力是一项巨大挑战。在本研究中，我们提出并研究了一种“共嵌入机制”，通过一步水热法将镁和聚苯胺（PANI）同时嵌入水合VO的层间（MgVOH/PANI）。无机-有机共嵌入可以调节VOH的层间距，这种组合在增强MgVOH/PANI中的锌离子存储方面发挥了协同作用。它显示出14.2 Å的极大层间距，在0.1 A g下比容量高达412 mA h g，并且在1000次循环后容量保持率可达98%。PANI本身具有储锌能力，与PANI共嵌入的镁可以提高材料的导电性并增强其稳定性。进一步的第一性原理计算清楚地揭示了钒氧化物的结构变化和改善的电化学性能。这种对VOH结构进行无机和有机共同调控的方法为调节层状材料的层状结构以提高其电化学性能开辟了新策略。
