1. Manganese buffer induced high-performance disordered MnVO cathodes in zinc batteries
- Author
-
Zhenghang Qi, Pengjun Zhang, Qun He, Shuangming Chen, Kefu Zhu, Xiaozhi Su, Dengfeng Cao, Changda Wang, Yuyang Cao, Shiqiang Wei, Wen Wen, Li Song, Babu Ganguli, Pulickel M. Ajayan, Xiaojun Wu, and Xin Guo
- Subjects
Battery (electricity) ,Materials science ,Renewable Energy, Sustainability and the Environment ,Metal ions in aqueous solution ,Intercalation (chemistry) ,Inorganic chemistry ,Vanadium ,chemistry.chemical_element ,Zinc ,Manganese ,Pollution ,Vanadium oxide ,Cathode ,law.invention ,Nuclear Energy and Engineering ,chemistry ,law ,Environmental Chemistry - 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 gā1 at 0.2 A gā1 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.
- Published
- 2021