Potassium ion pre-intercalated MnO2 for aqueous multivalent ion batteries
Zikang Xu , Ruiqi Ren , Hang Ren , Jingyuan Zhang , Jinyao Yang , Jiawen Qiu , Yizhou Zhang , Guoyin Zhu , Liang Huang , Shengyang Dong
Front. Optoelectron. ›› 2023, Vol. 16 ›› Issue (4) : 39
Potassium ion pre-intercalated MnO2 for aqueous multivalent ion batteries
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, K0.21MnO2·0.31H2O (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.
Aqueous batteries / Multivalent ion batteries / Magnesium ion / Aluminum ion / MnO 2
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The Author(s) 2023
Supplementary files
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