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Open AccessArticle

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

BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Batteries 2017, 3(1), 4;
Received: 9 November 2016 / Revised: 5 January 2017 / Accepted: 23 January 2017 / Published: 6 February 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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. View Full-Text
Keywords: ionic liquid (IL); non-aqueous electrolyte; nickel/metal hydride (Ni/MH) batteries ionic liquid (IL); non-aqueous electrolyte; nickel/metal hydride (Ni/MH) batteries
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MDPI and ACS Style

Meng, T.; Young, K.-H.; Wong, D.F.; Nei, J. Ionic Liquid-Based Non-Aqueous Electrolytes for Nickel/Metal Hydride Batteries. Batteries 2017, 3, 4.

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