Bai Shuai, Wang Xi, Wang Qiming, Chen Zhuo, Zhang Yining
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China.
University of Chinese Academy of Sciences, Beijing 100049, PR China.
ACS Appl Mater Interfaces. 2024 May 1;16(17):22403-22410. doi: 10.1021/acsami.4c01648. Epub 2024 Apr 18.
In this paper, a bimetallic NaMgVO·0.98HO (NMVO) material with an interlayer spacing of 11.67 Å was synthesized by a simple preintercalation method as a cathode for zinc ionic batteries (ZIBs). The large layer spacing provides a wide channel for the embedding of Zn, resulting in high reversible capacity and ion diffusion kinetics. In addition, by virtue of the high electronic conductivity of metal ions, NMVO exhibits excellent electronic conductivity under the combined action of Na and Mg bimetallic intercalation. At the same time, preintercalation ions and structural water act as interlayer pillars to stabilize the layer structure of NMVO during the cycling process. The above reasonable structural design endows the NMVO with excellent electrochemical performance. The battery with NMVO cathode delivers a high initial capacity of 126 mAh g at 10 A g, and still remains at 76% after 5000 cycles, providing 100 Wh kg energy density and 9.5 kW kg power density (based on the mass of cathode). This bimetallic intercalation structure provides a general feasible scheme for the design of vanadium-based electrode materials.
在本文中，通过一种简单的预插层方法合成了一种层间距为11.67 Å的双金属NaMgVO·0.98H₂O（NMVO）材料，用作锌离子电池（ZIBs）的阴极。大的层间距为锌的嵌入提供了宽阔的通道，从而产生高可逆容量和离子扩散动力学。此外，由于金属离子的高电子导电性，NMVO在Na和Mg双金属插层的共同作用下表现出优异的电子导电性。同时，预插层离子和结构水作为层间支柱，在循环过程中稳定NMVO的层状结构。上述合理的结构设计赋予了NMVO优异的电化学性能。具有NMVO阴极的电池在10 A g下具有126 mAh g的高初始容量，在5000次循环后仍保持76%，提供100 Wh kg的能量密度和9.5 kW kg的功率密度（基于阴极质量）。这种双金属插层结构为钒基电极材料的设计提供了一种通用可行的方案。
