1. Promoting Proton Migration Kinetics by Ni2+ Regulating Enables Improved Aqueous Zn‐MnO2 Batteries.
- Author
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Ji, Jie, Yao, Jia, Xu, Yongchang, Wan, Houzhao, Zhang, Bao, Lv, Lin, Li, Jingying, Wang, Nengze, Zheng, Zhaohan, Zhang, Jun, Ma, Guokun, Tao, Li, Wang, Hanbin, Wang, Yi, and Wang, Hao
- Subjects
DIFFUSION barriers ,PROTONS ,ACTIVATION energy ,ELECTROSTATIC interaction ,CHEMICAL kinetics ,TUNNEL ventilation - Abstract
The energy storage behaviors of MnO2 for aqueous Zn‐MnO2 batteries mainly depend on the Zn2+/H+ intercalation but are limited by poor ion/electron migration dynamics and stability. Herein, a strategy is proposed that promoting proton migration kinetics ameliorates H+ storage activity by introducing Ni2+ into γ‐MnO2 (Ni‐MnO2). Ni2+ can lower the diffusion barrier of H+ and selectively induce the ion intercalation, thereby alleviating the electrostatic interaction with the lattice. Moreover, Ni2+ enables the adjacent [MnO6] octahedrons to have better electron conductivity. The Ni‐MnO2 exhibits superior rate performance (nearly four times specific capacity compared with MnO2) and ultra‐long‐cycle stability (100% of capacity retention after 11 000 cycles at 3.0 A g−1). The calculation indicates that the Ni‐MnO2 allows H+ migrate rapidly along the one‐dimensional tunnel due to reduction of the activation energy caused by Ni2+ regulating, thus achieving excellent reaction kinetics. This work brings great potential for the development of high‐performance aqueous Zn‐MnO2 batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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