electrochemically activated VO@MXene cathode for a super high-rate and long-life Zn-ion battery.

Dalton Trans

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.

Published: April 2024

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.

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Source
http://dx.doi.org/10.1039/d4dt00488dDOI Listing

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