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Self-discharge mechanism of vanadium-titanium metal hydride electrodesfor Ni-MH rechargeable battery

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Abstract

In order to investigate the effect of the equilibrium hydrogen pressure (plateau pressure) of metal hydride (MH) alloys on self-discharge behavior, V09Ti01 alloys having multi-plateau pressures (the low and high plateau pressure) have been used as working electrodes in a half cell. A thermal desorption experiment and open-circuit potential monitoring were conducted to observe the self-discharge behavior of the electrodes. From the thermal desorption spectra of fully charged and discharged V09Ti01 electrodes (to-0.7 V vs. Hg/ HgO), it was found that only the high plateau pressure region from V09Ti01 electrodes is electrochemically useful in battery application. However, the open-circuit potential change and thermal desorption spectra of V09Ti01 electrodes after various open-circuit storage periods prove that self-discharge behavior is caused by hydrogen desorption from the low plateau pressure region (10-8 atm) as well as the high plateau pressure region (0.1 atm). Therefore, it is suggested that the self-discharge behavior of V09Ti01 electrodes cannot be suppressed effectively by reduction of the plateau pressure of alloys through alloy modification.In addition, the pressure-composition-isotherms (P-C-T) of the low pressure region can be estimated by using the open-circuit potential corresponding to this region in Nernst’s equation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Kusong-dong 373-1, 305-701, Yusong-gu, Taejon, Korea

    Jae-Han Jung, Ji-Sang Yu, Kuk-Jin Jang & Jai-Young Lee

  2. Electronic Materials Research Institute, LG Chemical Ltd. Research Park, P.O. Box 61, 305-380, Yusong, Science Town, Taejon, Korea

    Han-Ho Lee

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  1. Jae-Han Jung
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  2. Han-Ho Lee
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  3. Ji-Sang Yu
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  4. Kuk-Jin Jang
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Jung, JH., Lee, HH., Yu, JS. et al. Self-discharge mechanism of vanadium-titanium metal hydride electrodesfor Ni-MH rechargeable battery. Metals and Materials 3, 178–182 (1997). https://doi.org/10.1007/BF03025959

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