摘要
The charge discharge performance and cycle stability of D size Ni/MH batteries at -20 ℃, 25 ℃ and 55 ℃ were examined. The results show that the decline rate of Ni/MH battery discharge capacity at -20 ℃ and 55 ℃ are 12.1% and 13.6%,and the average discharge voltage decreases by a value of 0.13 V and 0.06 V respectively, cycling stability declines obviously at various temperatures. The capacity degradation of Ni/MH batteries under low temperature is reversible, belonging to transient degradation and that of high and normal temperatures are not reversible, belonging to permanent degradation. Electrochemical impedance spectroscopy, scanning electron microscope and energy dispersive X ray analyzer were introduced to study the main causes of cycling deterioration of Ni/MH batteries.
The charge discharge performance and cycle stability of D size Ni/MH batteries at -20 ℃, 25 ℃ and 55 ℃ were examined. The results show that the decline rate of Ni/MH battery discharge capacity at -20 ℃ and 55 ℃ are 12.1% and 13.6%,and the average discharge voltage decreases by a value of 0.13 V and 0.06 V respectively, cycling stability declines obviously at various temperatures. The capacity degradation of Ni/MH batteries under low temperature is reversible, belonging to transient degradation and that of high and normal temperatures are not reversible, belonging to permanent degradation. Electrochemical impedance spectroscopy, scanning electron microscope and energy dispersive X ray analyzer were introduced to study the main causes of cycling deterioration of Ni/MH batteries.
出处
《中国有色金属学会会刊：英文版》
CSCD
2004年第1期208-214,共7页
Transactions of Nonferrous Metals Society of China
基金
Project( 2 0 0 2CB2 1180 0 )supportedbyNationalKeyBasicResearchandDevelopmentProgramandproject( 2 0 0 1CCA0 5 0 0 0 )supportedbyNationalKeyProgramforBasicResearchofChina
