标题: A dilute kosmotropic eutectic electrolyte for practical four-electron aqueous Zn-Iodine batteries
作者: Li, SZ (Li, Shizhen); Ye, ZH (Ye, Zihan); Chen, ZJ (Chen, Zejun); Geng, MZ (Geng, Mengzi); Yang, HQ (Yang, Hangqi); Wang, GP (Wang, Guoping); Jin, XB (Jin, Xianbo); Peng, C (Peng, Chuang)
来源出版物: ENERGY STORAGE MATERIALS 卷: 81 文献号: 104487 DOI: 10.1016/j.ensm.2025.104487 Early Access Date: JUL 2025 Published Date: 2025 SEP
摘要: Hydrolysis of I+ and instability of zinc anode in dilute aqueous electrolytes are two main obstacles for constructing high-rate, long-cycle-life and cost-effective aqueous Zn-iodine batteries with I+/I2/I- conversion (4eZIBs). Here, a kosmotropic eutectic electrolyte (KEE) was obtained using ZnSO4 & sdot;7H2O and 1-Butyl-3-methylimidazolium chloride structure makers. The combined kosmotropic and eutectic features enable highly effective regulation of water activity while simultaneously facilitating reversible and stable chemistries of both the iodine cathode and zinc anode. Specifically, appropriate amount of water is crucial to reversible, fast and stable fourelectron transfer of the iodine cathode. Meanwhile, the restricted water activity and water-deficient solvation structure of ZnCl(SO4)(H2O)4- grant stable zinc anodes. Consequently, the 4eZIB with dilute KEE (3.2 M) exhibits stable cycle performance for over 27,000 cycles, along with high Coulombic efficiency of 99.6 %. Moreover, the 4eZIB also demonstrates overall performance enhancement, as manifested in a practical pouch cell. This work provides mechanistic understanding on electrolyte design for solving complex issues in 4eZIBs.
作者关键词: Zinc battery; Aqueous battery; Four-electron transfer; Iodine cathode; Eutectic electrolyte
KeyWords Plus: IONIC LIQUIDS; ZINC-ION; SOLVENT; PLATINUM; DYNAMICS; IODATE
地址: [Li, Shizhen; Ye, Zihan; Chen, Zejun; Geng, Mengzi; Yang, Hangqi; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.
[Jin, Xianbo] Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Peoples R China.
[Wang, Guoping] Bicai Elect Technol Ltd, Yichun 33600, Jiangxi, Peoples R China.
通讯作者地址: Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.
Jin, XB (通讯作者)，Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Peoples R China.
电子邮件地址: [email protected]; [email protected]
影响因子：20.2
