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Citation: BAI Shou-Li, LI Xin, WEN Yue-Hua, CHENG Jie, CAO Gao-Ping, YANG Yu-Sheng, LI Dian-Qing. Effect of Electrolyte on the Electrochemical Performance of the MnO₂ Cathode for Aqueous Rechargeable Batteries[J]. Acta Physico-Chimica Sinica, ;2016, 32(8): 2007-2017. doi: 10.3866/PKU.WHXB201604261 shu

Effect of Electrolyte on the Electrochemical Performance of the MnO₂ Cathode for Aqueous Rechargeable Batteries

1.
Faculty of Science, Beijing University of Chemical Technology, Beijing 110159, P. R. China;
2.
Research Institute of Chemical Defence, Beijing 100191, P. R. China

Received Date: 15 February 2016
Revised Date: 25 April 2016

Fund Project: The project was supported by the Beijing Key Laboratory of Advanced Chemical Energy Storage Technology and Material (Z121109002812019).

The effect of Li⁺, Zn²⁺, and Mn²⁺ ions in aqueous solution on the electrochemical performance of the MnO₂ cathode characterized by different crystal structures and morphologies was investigated. The energy storage mechanism of MnO₂ in the mixed solution was probed. The results show that in aqueous solution without Mn²⁺ ions, various MnO₂ electrodes exhibit similar electrochemical performance with low capacity and severe attenuation. In an aqueous solution with Zn²⁺ ions, the capacity of MnO₂ electrodes is enhanced, which can be attributed to insertion/extraction of zinc ions. However, the decay of the capacity is drastic. When aqueous solutions containing Mn²⁺ and Zn²⁺ ions are used, particle aggregation and crystal structure collapse of MnO₂ are effectively prevented owing to the synergistic effect of zinc and manganese ions and the redox reaction process of Mn²⁺ ions. The negative influence of the ZnSO₄·3Zn(OH)₂ impurity is also weakened. As a result, the high capacity of MnO₂ electrodes resulting from insertion/extraction of zinc ions is maintained (~200 mAh·g^-1 at 100 mA·g^-1) with excellent cycling stability.
- Aqueous rechargeable battery,
- Manganese dioxide,
- Electrolyte,
- Zinc and manganese ion storage
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of Electrolyte on the Electrochemical Performance of the MnO₂ Cathode for Aqueous Rechargeable Batteries