TY - JOUR
T1 - Study of early cycling deterioration of a Ni/MH battery by electrochemical impedance spectroscopy
AU - Cheng, Shaoan
AU - Zhang, Jianqing
AU - Liu, Hong
AU - Leng, Yongjun
AU - Yuan, Anbao
AU - Cao, Chunan
N1 - Funding Information:
The authors are grateful to the Zhejiang provincial Natural Science Foundation of China and Chinese `863' Project for support of this work.
PY - 1998/7/15
Y1 - 1998/7/15
N2 - a.c. impedance measurements are made on spiral-wound, size 4/5A, Ni/MH batteries, which are prepared by using direct-seal technology. Both the positive and the negative electrodes are fabricated by filling in a porous nickel substrate with the active materials. The main purpose of the investigation is to determine the cause(s) of the early cycling deterioration of this foam-type battery. The results demonstrate that the cycle-life curve can be divided into three parts. After little change in capacity and voltage, deterioration of the Ni/MH battery occurs as the voltage performance decreases. This is followed by a sharp decrease in both the discharge capacity and the voltage performance. The decrease in voltage performance is due to drying of the separator, which increases the total ohmic resistance of the battery, while the decrease of discharge capacity is due to an inactive surface that increases the charge-transfer resistance of the battery.
AB - a.c. impedance measurements are made on spiral-wound, size 4/5A, Ni/MH batteries, which are prepared by using direct-seal technology. Both the positive and the negative electrodes are fabricated by filling in a porous nickel substrate with the active materials. The main purpose of the investigation is to determine the cause(s) of the early cycling deterioration of this foam-type battery. The results demonstrate that the cycle-life curve can be divided into three parts. After little change in capacity and voltage, deterioration of the Ni/MH battery occurs as the voltage performance decreases. This is followed by a sharp decrease in both the discharge capacity and the voltage performance. The decrease in voltage performance is due to drying of the separator, which increases the total ohmic resistance of the battery, while the decrease of discharge capacity is due to an inactive surface that increases the charge-transfer resistance of the battery.
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U2 - 10.1016/S0378-7753(98)00061-5
DO - 10.1016/S0378-7753(98)00061-5
M3 - Article
AN - SCOPUS:0000147852
SN - 0378-7753
VL - 74
SP - 155
EP - 157
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 1
ER -
