标题: Acetamide-based hydrated eutectic electrolytes for supercapacitors with high voltage and low self-discharge

作者: Yang, HQ (Yang, Hangqi); Yu, F (Yu, Fang); Li, SZ (Li, Shizhen); Geng, MZ (Geng, Mengzi); Liu, JM (Liu, Juemiao); Chen, WR (Chen, Wanru); Jin, XB (Jin, Xianbo); Peng, C (Peng, Chuang)

来源出版物: ENERGY STORAGE MATERIALS 卷: 74 文献号: 103929 DOI: 10.1016/j.ensm.2024.103929 Published Date: 2025 JAN

摘要: Hydrated eutectic electrolytes (HEEs) hold promise as green, safe and affordable electrolytes for high-voltage electrochemical energy storage. The water molecules in HEEs participate in the solvation structure of cations, which is critical to the electrolyte performance. We hereby report HEEs consisting of NaClO4, N-methyl acetamide (NMAc) and water. By adjusting the ratio of the ingredients, the optimized HEEs-5 shows a wide electrochemical potential window, lowered viscosity and non-flammability. Spectroscopic analysis and molecular dynamics simulations reveal that NMAc and H2O form the inner solvation shell of Na+, while the free ClO4- result in enhanced ionic conductivity. Moreover, NMAc molecules form a protective barrier on the surface of carbon upon charging, inhibiting the activation-controlled faradaic self-discharge reactions caused by free water molecules. The supercapacitor with HEEs-5 electrolyte shows a high voltage of 2.3 V, ultra-long cycle life and low self-discharge. This work reveals the crucial roles of NMAc, but also shed light on the design and optimization of other HEEs.

作者关键词: High-voltage aqueous electrolyte; Hydrated eutectic electrolytes; Supercapacitor; Hydrated salts; Self-discharge

KeyWords Plus: HIGH-PERFORMANCE; WATER; SOLVENT; ENERGY; GREEN

地址: [Yang, Hangqi; Li, Shizhen; Geng, Mengzi; Liu, Juemiao; Chen, Wanru; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

[Yu, Fang] Shangqiu Normal Univ, Sch Surveying & Planning, Shangqiu 476000, Peoples R China.

[Jin, Xianbo] Wuhan Univ, Coll Chem & Mol Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

通讯作者地址: Chen, WR; Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

电子邮件地址: wanru.chen@whu.edu.cn; chuang.peng@whu.edu.cn

影响因子：18.9