Pre‐intercalation of Ammonium Ions in Layered δ‐MnO2 Nanosheets for High‐Performance Aqueous Zinc‐Ion Batteries

Layered manganese dioxide is a promising cathode candidate for aqueous Zn‐ion batteries. However, the narrow interlayer spacing, inferior intrinsic electronic conductivity and poor structural stability still limit its practical application. Herein, we report a two‐step strategy to incorporate ammoni...

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Bibliographic Details
Published in:Angewandte Chemie 2023-12, Vol.135 (51), p.n/a
Main Authors: Yao, Haixin, Yu, Huan, Zheng, Yaqi, Li, Nian Wu, Li, Sheng, Luan, Deyan, Lou, Xiong Wen (David), Yu, Le
Format: Article
Language:English
Subjects:
Ammonium
Ammonium Ions
Batteries
Cathodes
Chemistry
Electrochemical analysis
Electrochemistry
Hydrogen Bonds
Hydrothermal reactions
Interlayers
Ion storage
Ions
Manganese
Manganese dioxide
Nanosheets
Potassium
Pre-Intercalation
Structural stability
Zinc
Zn-Ion Batteries
δ-MnO2
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Summary:Layered manganese dioxide is a promising cathode candidate for aqueous Zn‐ion batteries. However, the narrow interlayer spacing, inferior intrinsic electronic conductivity and poor structural stability still limit its practical application. Herein, we report a two‐step strategy to incorporate ammonium ions into manganese dioxide (named as AMO) nanosheets as a cathode for boosted Zn ion storage. K+‐intercalated δ‐MnO2 nanosheets (KMO) grown on carbon cloth are chosen as the self‐involved precursor. Of note, ammonium ions could replace K+ ions via a facile hydrothermal reaction to enlarge the lattice space and form hydrogen‐bond networks. Compared with KMO, the structural stability and the ion transfer kinetics of the layered AMO are enhanced. As expected, the obtained AMO cathode exhibits remarkable electrochemical properties in terms of high reversible capacity, decent rate performance and superior cycling stability over 10000 cycles. δ‐MnO2 nanosheets with intercalated ammonium ions (AMO) are synthesized via a self‐templated strategy as a Zn‐ion battery cathode. The incorporation of ammonium ions enlarges the interlayer space and forms hydrogen bonds for enhanced structural robustness and fast reaction kinetics. As a result, the AMO cathode exhibits exceptional rate performance and long lifespan in full cells.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202315257