Three‐Dimensional Conductive Interface and Tip Structure of MnO2 Electrode Facilitate Superior Zinc Ion Batteries

• Published in: Small structures 2024-08, Vol.5 (8), p.n/a
• Main Authors: Zhou, Xingchen, Chen, Shengjie, Zhang, Yanhua, Yu, Baozhu, Chen, Yuanzhen, Liu, Yongning, Li, Sai, Liu, Liting, Jin, Hui, Deng, Junkai, Tan, Qiang
• Format: Article
• Language: English
• Subjects: 3D nanosphere structures; Batteries; Carbon nanotubes; Cathodes; Cathodic dissolution; Dissolution; Electric fields; Electron transfer; Electrons; Energy storage; finite element analysis; Frame structures; Manganese dioxide; manganese oxide; Raman spectroscopy; Rechargeable batteries; Stability; volume expansion; zinc ion batteries
• ISSN: 2688-4062; 2688-4062
• DOI: 10.1002/sstr.202400057

Manganese dioxide has been significantly utilized in zinc ion batteries (ZIBs). However, in the rechargeable battery system, the manganese dioxide cathode suffers from poor conductivity, volume expansion, and substance dissolution, resulting in low capacity and poor stability. Herein, a 3D frame structure MnO2@CNTs cathode is proposed. In this system, the electrodeposited spherical MnO2 is anchored and interlinked via the in‐situ growth carbon nanotubes (CNTs) onto the carbon cloth. Benefiting the unique 3D frame structure, the MnO2 structure crush problem and the pathway of the electrons and ions are dramatically improved. The optimized MnO2@CNTs cathode demonstrate a high capacity of 256.35 mAh g−1 at 0.1 A g−1 and exceptional cycling stability. Furthermore, in‐situ Raman spectroscopy elucidates the energy storage mechanism of aqueous ZIBs (AZIBs). Moreover, COMSOL finite elements analysis demonstrates that the petal edge‐rich nanostructures of MnO2@CNTs generate a localized high electric field under constant current, accelerating ion/electron transfer. This work explains the rationale for CNTs to improve the properties of MnO2 cathodes, providing a new perspective for the design of high‐performance batteries. Benefiting the unique 3D nanosphere structure of MnO2@carbon nanotubes (CNTs), the problem of MnO2 structure collapse and slow ion/electron diffusion are dramatically improved. Further, in situ Raman spectroscopy elucidate the energy‐storage mechanism of aqueous zinc‐ion batteries. Moreover, the tip of MnO2@CNTs generates a localized high electric field, accelerating ion/electron transfer by COMSOL finite‐elements analysis.