Duan Yunlong, Geng Zhi, Zhang Daohong, Wang Qiufan
Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan 430074, China.
Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang 515200, China.
Dalton Trans. 2024 Apr 23;53(16):7023-7034. doi: 10.1039/d4dt00488d.
The development of a high specific capacity and stable vanadium-based cathode material is very attractive for aqueous zinc-ion batteries (ZIBs). Herein, an electrochemically oxidized cathode is fabricated based on a VO@MXene cathode for Zn-ion storage. VO@MXene undergoes a phase transition to Zn(OH)VO·2HO and ZnVO on the first charge, thus allowing for the subsequent insertion/de-insertion of zinc ions, which can be regulated by the amount of HO in the electrolyte. The MXene in the composite was also beneficial to electron transfer and cycling stability. VO@MXene delivered a high capacity of 450 mA h g at 0.2 A g, ultra-high-rate performance and cycling stability as well as high energy density.
开发一种高比容量且稳定的钒基正极材料对水系锌离子电池（ZIBs）极具吸引力。在此，基于用于锌离子存储的VO@MXene正极制备了一种电化学氧化正极。VO@MXene在首次充电时经历相变形成Zn(OH)VO·2H₂O和ZnVO₃，从而允许随后锌离子的嵌入/脱嵌，这可以通过电解质中H₂O的量来调节。复合材料中的MXene也有利于电子转移和循环稳定性。VO@MXene在0.2 A g⁻¹时具有450 mA h g⁻¹的高容量、超高倍率性能、循环稳定性以及高能量密度。
