Hybrid Superlattice‐Triggered Selective Proton Grotthuss Intercalation in δ‐MnO2 for High‐Performance Zinc‐Ion Battery

Author:

Zhang Anqi1,Zhao Ran1,Wang Yahui12,Yue Jiasheng1,Yang Jingjing1,Wang Xinran12,Wu Chuan12ORCID,Bai Ying1

Affiliation:

1. Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P. R. China

2. Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019 P. R. China

Abstract

AbstractA great deal of attention has been paid on layered manganese dioxide (δ−MnO2) as promising cathode candidate for aqueous zinc‐ion battery (ZIB) due to the excellent theoretical capacity, high working voltage and Zn2+/H+ co‐intercalation mechanism. However, caused by the insertion of Zn2+, the strong coulomb interaction and sluggish diffusion kinetics have resulted in significant structure deformation, insufficient cycle stability and limited rate capability. And it is still far from satisfactory to accurately modulate H+ intercalation for superior electrochemical kinetics. Herein, the terrace‐shape δ−MnO2 hybrid superlattice by polyvinylpyrrolidone (PVP) pre‐intercalation (PVP−MnO2) was proposed with the state‐of‐the‐art ZIBs performance. Local atomic structure characterization and theoretical calculations have been pioneering in confirming the hybrid superlattice‐triggered synergy of electron entropy stimulation and selective H+ Grotthuss intercalation. Accordingly, PVP−MnO2 hybrid superlattice exhibits prominent specific capacity (317.2 mAh g−1 at 0.125 A g−1), significant rate performance (106.1 mAh g−1 at 12.5 A g−1), and remarkable cycle stability at high rate (≈100 % capacity retention after 20,000 cycles at 10 A g−1). Therefore, rational design of interlayer configuration paves the pathways to the development of MnO2 superlattice for advanced Zn−MnO2 batteries.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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