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Potassium ion pre-intercalated MnO₂ for aqueous multivalent ion batteries.

ABSTRACT: Manganese dioxide (MnO₂), as a cathode material for multivalent ion (such as Mg²⁺ and Al³⁺) storage, is investigated due to its high initial capacity. However, during multivalent ion insertion/extraction, the crystal structure of MnO₂ partially collapses, leading to fast capacity decay in few charge/discharge cycles. Here, through pre-intercalating potassium-ion (K⁺) into δ-MnO₂, we synthesize a potassium ion pre-intercalated MnO₂, K_0.21MnO₂·0.31H₂O (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 MgSO₄ electrolyte. In addition, we observe that aluminum-ion (Al³⁺) can also insert into a KMO cathode. This work provides a valid method for modification of manganese-based oxides for aqueous multivalent ion batteries.

SUBMITTER: Xu Z

PROVIDER: S-EPMC10692024 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature

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Potassium ion pre-intercalated MnO2 for aqueous multivalent ion batteries.

Xu Zikang Z Ren Ruiqi R Ren Hang H Zhang Jingyuan J Yang Jinyao J Qiu Jiawen J Zhang Yizhou Y Zhu Guoyin G Huang Liang L Dong Shengyang S

Frontiers of optoelectronics 20231201 1

Manganese dioxide (MnO2), as a cathode material for multivalent ion (such as Mg2+ and Al3+) storage, is investigated due to its high initial capacity. However, during multivalent ion insertion/extraction, the crystal structure of MnO2 partially collapses, leading to fast capacity decay in few charge/discharge cycles. Here, through pre-intercalating potassium-ion (K+) into δ-MnO2, we synthesize a potassium ion pre-intercalated MnO< ...[more]

PMID: 38038763

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