Manganese buffer induced high-performance disordered MnVO cathodes in zinc batteries

Shiqiang Wei; Shuangming Chen; Xiaozhi Su; Zhenghang Qi; Changda Wang; Babu Ganguli; Pengjun Zhang; Kefu Zhu; Yuyang Cao; Qun He; Dengfeng Cao; Xin Guo; Wen Wen; Xiaojun Wu; Pulickel M. Ajayan; Li Song

doi:10.1039/D1EE00590A

Manganese buffer induced high-performance disordered MnVO cathodes in zinc batteries†

Shiqiang Wei,‡^a Shuangming Chen,

‡^a Xiaozhi Su,^b Zhenghang Qi,^a Changda Wang,

^a Babu Ganguli,

^c Pengjun Zhang,^a Kefu Zhu,^a Yuyang Cao,^a Qun He,^a Dengfeng Cao,^a Xin Guo,^a Wen Wen,^b Xiaojun Wu,

^d Pulickel M. Ajayan^c and Li Song

*^a

Author affiliations

* Corresponding authors

^a National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China
E-mail: song2012@ustc.edu.cn

^b Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, P. R. China

^c Department of Materials Science and Nano Engineering, Rice University, Houston, TX 77005, USA

^d School of Chemistry and Material Sciences, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China

Abstract

Buffer reactions can prevent changes induced by external causes. Here, we demonstrate the significant buffer role of a very small amount of Mn in a self-optimized cathode for an aqueous Zn-ion battery. Our operando X-ray characterization studies reveal that the dissolution of most of the Mn in MnV₂O₄ during the first charging cycle induces atomic re-arrangement to form a disordered vanadium oxide phase with 0.88 at% Mn. Interestingly, the residual Mn ions exhibit voluntary migration between tetrahedral and octahedral sites during Zn²⁺ de/intercalation. This Mn migration not only stabilizes the main structure of the vanadium-based electrode, but also modulates the Fermi surface of V 3d against excessive drift. As result, the optimized cathode delivers an excellent capacity of 610.2 mA h g⁻¹ at 0.2 A g⁻¹ and long-term cycling stability over 4000 cycles. This buffer contribution via tunable metal ions exhibits high potential for applications in long-life metal-ion batteries and related fields.

Energy & Environmental Science

Manganese buffer induced high-performance disordered MnVO cathodes in zinc batteries†

Abstract

Supplementary files

Article information

Download Citation

Permissions

Manganese buffer induced high-performance disordered MnVO cathodes in zinc batteries

Social activity

Search articles by author

Spotlight

Advertisements