DocumentCode :
307123
Title :
Surface-modified Mg2Ni-type negative electrode materials for Ni-MH battery
Author :
Cui, N. ; Luan, B. ; Bradhurst, D. ; Liu, H.K. ; Dou, S.X.
Author_Institution :
Inst. for Mater. Technol. & Manuf., Wollongong Univ., NSW, Australia
fYear :
1997
fDate :
14-17 Jan 1997
Firstpage :
317
Lastpage :
322
Abstract :
In order to further improve the electrode performance of Mg1.9Y0.1Ni0.9Al0.1 alloy at ambient temperature, its surface was modified by an ultrasound pretreatment in the alkaline solution and microencapsulation with Ni-P coating. The effects of various surface modifications on the microstructure and electrochemical performance of the alloy electrodes were investigated and compared in this paper. It was found that the modification with ultrasound pretreatment significantly improved the electrocatalytic activity of the negative electrode and then reduced the overpotential of charging/discharging, resulting in a remarkable increase of electrode capacity and high-rate discharge capability but having little influence on the cycle life. However, the electrode fabricated from the microencapsulated alloy powder showed a higher discharge capacity, better high-rate discharge capability and longer cycle life as well
Keywords :
acoustic applications; catalysis; crystal microstructure; electrochemical electrodes; magnesium alloys; nickel; nickel alloys; secondary cells; surface treatment; ultrasonic applications; Mg1.9Y0.1Ni0.9Al0.1; Mg1.9Y0.1Ni0.9Al0.1 alloy; Mg2Ni; Mg2Ni-type negative electrode materials; Ni-MH battery; Ni-P; Ni-P coating; alkaline solution; ambient temperature; charging/discharging overpotential; electrocatalytic activity; electrochemical performance; electrode capacity increase; electrode performance improvement; high-rate discharge capability; higher discharge capacity; longer cycle life; microencapsulated alloy powder; microencapsulation; microstructure; surface modification; ultrasound pretreatment; Aluminum alloys; Coatings; Electrodes; Microstructure; Nickel alloys; Powders; Surface charging; Surface discharges; Temperature; Ultrasonic imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Battery Conference on Applications and Advances, 1997., Twelfth Annual
Conference_Location :
Long Beach, CA
ISSN :
1089-8182
Print_ISBN :
0-7803-3631-3
Type :
conf
DOI :
10.1109/BCAA.1997.574124
Filename :
574124
Link To Document :
https://search.ricest.ac.ir/dl/search/defaultta.aspx?DTC=49&DC=307123
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