TY - JOUR
T1 - Charge and discharge characteristics of sintered Mg2Ni
AU - Watanabe, Kuniaki
AU - Shu, Wei Min
AU - Mizukami, Kenzo
AU - Kobayashi, Kohji
AU - Hatano, Yuji
AU - Morozumi, Shotaro
N1 - Funding Information:
This work has been supported in part by a Grand-in-Aid for Scientific Research on Priority Areas A of “New Protium Function” from the Ministry of Education, Science, Sports and Culture.
PY - 1999/12/20
Y1 - 1999/12/20
N2 - The effects of sample preparation of a Mg2Ni anode for a nickel/metal hydride battery were studied with an open electrochemical cell. The discharge capacity of sintered Mg2Ni increased initially with the charge/discharge cycles. The cycle life (CL) for sintered samples was much greater than that of un-sintered samples, and the largest CL appeared at a sintering temperature of 550 °C. It was also observed that slight pre-oxidation of the sample powder was effective in improving the CL. Those effects were examined through the changes in the specific surface area and the chemical composition. The sample sintered at 550 °C had the largest specific surface area, and the segregation of Mg over the outside layer of samples was confirmed for those sintered at temperatures higher than 550 °C. The degradation after charge/discharge cycling was investigated with X-ray diffraction and scanning electron microscopy. The XRD pattern showed a new phase of Mg(OH)2, besides the phase of Mg2Ni, after charge/discharge cycling. This indicates that the formation of Mg(OH)2 on the outside layer of the samples contributes to the degradation of the anode performance.
AB - The effects of sample preparation of a Mg2Ni anode for a nickel/metal hydride battery were studied with an open electrochemical cell. The discharge capacity of sintered Mg2Ni increased initially with the charge/discharge cycles. The cycle life (CL) for sintered samples was much greater than that of un-sintered samples, and the largest CL appeared at a sintering temperature of 550 °C. It was also observed that slight pre-oxidation of the sample powder was effective in improving the CL. Those effects were examined through the changes in the specific surface area and the chemical composition. The sample sintered at 550 °C had the largest specific surface area, and the segregation of Mg over the outside layer of samples was confirmed for those sintered at temperatures higher than 550 °C. The degradation after charge/discharge cycling was investigated with X-ray diffraction and scanning electron microscopy. The XRD pattern showed a new phase of Mg(OH)2, besides the phase of Mg2Ni, after charge/discharge cycling. This indicates that the formation of Mg(OH)2 on the outside layer of the samples contributes to the degradation of the anode performance.
UR - http://www.scopus.com/inward/record.url?scp=0033284951&partnerID=8YFLogxK
U2 - 10.1016/S0925-8388(99)00355-2
DO - 10.1016/S0925-8388(99)00355-2
M3 - 会議記事
AN - SCOPUS:0033284951
SN - 0925-8388
VL - 293
SP - 626
EP - 631
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
T2 - Proceedings of the 1998 International Symposium on Metal-Hydrogen Systems - Fundamentals and Applications (MH98)
Y2 - 4 October 1998 through 9 October 1998
ER -