Degradation of amorphous MgNi electrode and effect of heat treatment in Ar

Yuji Hatano; Tomoyuki Tachikawa; Daobin Mu; Takayuki Abe; Kuniaki Watanabe; Shotaro Morozumi

doi:10.1016/S0925-8388(01)01455-4

Degradation of amorphous MgNi electrode and effect of heat treatment in Ar

Yuji Hatano^*, Tomoyuki Tachikawa, Daobin Mu, Takayuki Abe, Kuniaki Watanabe, Shotaro Morozumi

^*Corresponding author for this work

Hydrogen Isotope Research Center, Organization for Promotion of Research

Research output: Contribution to journal › Conference article › peer-review

28 Scopus citations

Abstract

The mechanism underlying degradation of an amorphous MgNi electrode was studied. Amorphous MgNi powder was prepared by mechanical alloying, and a charge/discharge cycle test was carried out in 6 M KOH solution. The amount of hydrogen absorbed in the charge process was determined by vacuum hydrogen extraction. The discharge capacity decreased rapidly with progress of the cycle test. The results of the hydrogen extraction indicated that almost all hydrogen absorbed in the charge process was released in the discharge process. X-ray diffraction analyses showed that Mg(OH)₂ was formed on the surfaces of MgNi particles after the cycle test. It was deduced that the reduction in the discharge capacity was mainly due to the degradation in absorption capability in the charge process caused by retardation of electron transfer by Mg(OH)₂ layer. The cyclic stability of the discharge capacity was improved by heat treatment in Ar at 573 K.

Original language	English
Pages (from-to)	816-820
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	330-332
DOIs	https://doi.org/10.1016/S0925-8388(01)01455-4
State	Published - 2002/01/17
Event	Proceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia Duration: 2000/10/01 → 2000/10/06

Keywords

Amorphous
Anode
Magnesium
Mg(OH)
MgNi
Nickel/metal hydride battery

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0925-8388(01)01455-4

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title = "Degradation of amorphous MgNi electrode and effect of heat treatment in Ar",

abstract = "The mechanism underlying degradation of an amorphous MgNi electrode was studied. Amorphous MgNi powder was prepared by mechanical alloying, and a charge/discharge cycle test was carried out in 6 M KOH solution. The amount of hydrogen absorbed in the charge process was determined by vacuum hydrogen extraction. The discharge capacity decreased rapidly with progress of the cycle test. The results of the hydrogen extraction indicated that almost all hydrogen absorbed in the charge process was released in the discharge process. X-ray diffraction analyses showed that Mg(OH)2 was formed on the surfaces of MgNi particles after the cycle test. It was deduced that the reduction in the discharge capacity was mainly due to the degradation in absorption capability in the charge process caused by retardation of electron transfer by Mg(OH)2 layer. The cyclic stability of the discharge capacity was improved by heat treatment in Ar at 573 K.",

keywords = "Amorphous, Anode, Magnesium, Mg(OH), MgNi, Nickel/metal hydride battery",

author = "Yuji Hatano and Tomoyuki Tachikawa and Daobin Mu and Takayuki Abe and Kuniaki Watanabe and Shotaro Morozumi",

note = "Funding Information: This work has been supported in part by a Grant-in-Aid for Scientific Research on Priority Areas A of {\textquoteleft}New Protium Function{\textquoteright} of the Ministry of Education, Science, Sports and Culture of Japan. Thanks are offered to Matshushita Electric Industrial Co. for the gift of the cathode material and to Japan Metals and Chemicals Co. for that of Mg 2 Ni powder. The authors express their sincere thanks to Professor C. Iwakura of Osaka Prefecture University and to Professor H. Fujii of Hiroshima University for the advice in the sample preparation.; Proceedings of the International Symposium on Metal-Hydrogen (MH 2000) ; Conference date: 01-10-2000 Through 06-10-2000",

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doi = "10.1016/S0925-8388(01)01455-4",

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T1 - Degradation of amorphous MgNi electrode and effect of heat treatment in Ar

AU - Hatano, Yuji

AU - Tachikawa, Tomoyuki

AU - Mu, Daobin

AU - Abe, Takayuki

AU - Watanabe, Kuniaki

AU - Morozumi, Shotaro

N1 - Funding Information: This work has been supported in part by a Grant-in-Aid for Scientific Research on Priority Areas A of ‘New Protium Function’ of the Ministry of Education, Science, Sports and Culture of Japan. Thanks are offered to Matshushita Electric Industrial Co. for the gift of the cathode material and to Japan Metals and Chemicals Co. for that of Mg 2 Ni powder. The authors express their sincere thanks to Professor C. Iwakura of Osaka Prefecture University and to Professor H. Fujii of Hiroshima University for the advice in the sample preparation.

PY - 2002/1/17

Y1 - 2002/1/17

N2 - The mechanism underlying degradation of an amorphous MgNi electrode was studied. Amorphous MgNi powder was prepared by mechanical alloying, and a charge/discharge cycle test was carried out in 6 M KOH solution. The amount of hydrogen absorbed in the charge process was determined by vacuum hydrogen extraction. The discharge capacity decreased rapidly with progress of the cycle test. The results of the hydrogen extraction indicated that almost all hydrogen absorbed in the charge process was released in the discharge process. X-ray diffraction analyses showed that Mg(OH)2 was formed on the surfaces of MgNi particles after the cycle test. It was deduced that the reduction in the discharge capacity was mainly due to the degradation in absorption capability in the charge process caused by retardation of electron transfer by Mg(OH)2 layer. The cyclic stability of the discharge capacity was improved by heat treatment in Ar at 573 K.

AB - The mechanism underlying degradation of an amorphous MgNi electrode was studied. Amorphous MgNi powder was prepared by mechanical alloying, and a charge/discharge cycle test was carried out in 6 M KOH solution. The amount of hydrogen absorbed in the charge process was determined by vacuum hydrogen extraction. The discharge capacity decreased rapidly with progress of the cycle test. The results of the hydrogen extraction indicated that almost all hydrogen absorbed in the charge process was released in the discharge process. X-ray diffraction analyses showed that Mg(OH)2 was formed on the surfaces of MgNi particles after the cycle test. It was deduced that the reduction in the discharge capacity was mainly due to the degradation in absorption capability in the charge process caused by retardation of electron transfer by Mg(OH)2 layer. The cyclic stability of the discharge capacity was improved by heat treatment in Ar at 573 K.

KW - Amorphous

KW - Anode

KW - Magnesium

KW - Mg(OH)

KW - MgNi

KW - Nickel/metal hydride battery

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DO - 10.1016/S0925-8388(01)01455-4

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SN - 0925-8388

VL - 330-332

SP - 816

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

T2 - Proceedings of the International Symposium on Metal-Hydrogen (MH 2000)

Y2 - 1 October 2000 through 6 October 2000

ER -

Degradation of amorphous MgNi electrode and effect of heat treatment in Ar

Abstract

Keywords

ASJC Scopus subject areas

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