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Open AccessArticle

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

1
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
2
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; https://doi.org/10.3390/batteries3010004
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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