Agar Acts as Cathode Microskin to Extend the Cycling Life of Zn//α-MnO2 Batteries

Materials

Xinhai Yuan¹  Juan Wen¹  Yuping Wu¹  Xi Chen¹  Linqing Zuo¹  Shiyu Zhou¹  Haodong Sun¹  Teunis van Ree² 

[1] China State Key Laboratory of Materials-Oriented Chemical Engineering, Institute of Advanced Materials (IAM), School of Energy Science and Engineering, Nanjing Tech University, Nanjing 210009, China;Department of Chemistry, University of Venda, Thohoyandou 0950, South Africa;

关键词: aqueous rechargeable battery;    positive electrode;    manganese dioxide;    high discharge capacity;   

DOI  :  10.3390/ma14174895

来源: DOAJ

【 摘 要 】

The Zn/MnO₂ battery is a promising energy storage system, owing to its high energy density and low cost, but due to the dissolution of the cathode material, its cycle life is limited, which hinders its further development. Therefore, we introduced agar as a microskin for a MnO₂ electrode to improve its cycle life and optimize other electrochemical properties. The results showed that the agar-coating layer improved the wettability of the electrode material, thereby promoting the diffusion rate of Zn²⁺ and reducing the interface impedance of the MnO₂ electrode material. Therefore, the Zn/MnO₂ battery exhibited outstanding rate performance. In addition, the agar-coating layer promoted the reversibility of the MnO₂/Mn²⁺ reaction and acted as a colloidal physical barrier to prevent the dissolution of Mn²⁺, so that the Zn/MnO₂ battery had a high specific capacity and exhibited excellent cycle stability.

【 授权许可】

Unknown