Potassium ion pre-intercalated MnO2 for aqueous multivalent ion batteries

Manganese dioxide (MnO 2 ), as a cathode material for multivalent ion (such as Mg 2+ and Al 3+ ) storage, is investigated due to its high initial capacity. However, during multivalent ion insertion/extraction, the crystal structure of MnO 2 partially collapses, leading to fast capacity decay in few...

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Bibliographic Details
Published in:Frontiers of Optoelectronics (Online) 2023-12, Vol.16 (1), p.39-39, Article 39
Main Authors: Xu, Zikang, Ren, Ruiqi, Ren, Hang, Zhang, Jingyuan, Yang, Jinyao, Qiu, Jiawen, Zhang, Yizhou, Zhu, Guoyin, Huang, Liang, Dong, Shengyang
Format: Article
Language:English
Subjects:
Aluminum ion
Aqueous batteries
Biomedical Engineering and Bioengineering
Electrical Engineering
Engineering
Letter
Magnesium ion
MnO2
Multivalent ion batteries
Physics
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Summary:Manganese dioxide (MnO 2 ), as a cathode material for multivalent ion (such as Mg 2+ and Al 3+ ) storage, is investigated due to its high initial capacity. However, during multivalent ion insertion/extraction, the crystal structure of MnO 2 partially collapses, leading to fast capacity decay in few charge/discharge cycles. Here, through pre-intercalating potassium-ion (K + ) into δ-MnO 2 , we synthesize a potassium ion pre-intercalated MnO 2 , K 0.21 MnO 2 ·0.31H 2 O (KMO), as a reliable cathode material for multivalent ion batteries. The as-prepared KMO exhibits a high reversible capacity of 185 mAh/g at 1 A/g, with considerable rate performance and improved cycling stability in 1 mol/L MgSO 4 electrolyte. In addition, we observe that aluminum-ion (Al 3+ ) can also insert into a KMO cathode. This work provides a valid method for modification of manganese-based oxides for aqueous multivalent ion batteries. Graphical Abstract
ISSN:2095-2767
2095-2759
2095-2767
DOI:10.1007/s12200-023-00093-0