Ionic Liquid-Based Non-Aqueous Electrolytes for Nickel/Metal Hydride Batteries

Autor: Tiejun Meng, Kwo-Hsiung Young, Diana F. Wong, Jean Nei
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Batteries, Vol 3, Iss 1, p 4 (2017)
Druh dokumentu: article
ISSN: 2313-0105
DOI: 10.3390/batteries3010004
Popis: The voltage of an alkaline electrolyte-based battery is often limited by the narrow electrochemical stability window of water (1.23 V). As an alternative to water, ionic liquid (IL)-based electrolyte has been shown to exhibit excellent proton conducting properties and a wide electrochemical stability window, and can be used in proton conducting batteries. In this study, we used IL/acid mixtures to replace the 30 wt % KOH aqueous electrolyte in nickel/metal hydride (Ni/MH) batteries, and verified the proton conducting character of these mixtures through electrochemical charge/discharge experiments. Dilution of ILs with acetic acid was found to effectively increase proton conductivity. By using 2 M acetic acid in 1-ethyl-3-methylimidazolium acetate, stable charge/discharge characteristics were obtained, including low charge/discharge overpotentials, a discharge voltage plateau at ~1.2 V, a specific capacity of 161.9 mAh·g−1, and a stable cycling performance for an AB5 metal hydride anode with a (Ni,Co,Zn)(OH)2 cathode.
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