Solid-state metal hydride secondary batteries using heteropolyacid hydrate as an electrolyte |
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Authors: | Hiroki Sakaguchi Keisuke Hatakeyama Taku Yamaguchi Hirosh Inoue Chiaki Iwakura Takao Esaka |
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Institution: | (1) Department of Materials Science, Faculty of Engineering, Tottori University, Minami 4-101, Koyamacho, Tottori 680-0945, Japan;(2) Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, I-I, Gakuencho, Sakai, Osaka 599-8531, Japan |
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Abstract: | In order to enhance the performance of a solid-state MnO2-metal hydride battery using H3PMo12O40 · 20H2O as an electrolyte, a moderate amount of the electrolyte was added to both positive and negative electrodes. The high rate
characteristics of the battery were improved significantly by optimizing the electrolyte content in the electrodes; the resulting
battery was able to operate over 140 cycles, even at a current density of 20 mA/g alloy, which is large enough for the batteries
using inorganic solid electrolytes, and keep the discharge efficiency about 90%. The improvement of battery performance appears
to be caused by an increase in electrode-electrolyte interface area. The AC impedance analyses revealed that the resistance
of interface is decreased by the addition of a suitable amount of the electrolyte, suggesting an increase in the interface
area. |
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Keywords: | Metal hydride battery heteropolyacid hydrate H3PMo12O40 · nH2O solid-state battery solid electrolyte secondary battery |
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