【摘要】 检测并比较了D型MH Ni动力电池在不同温度下(25℃、55℃、-20℃)的放电性能和循环稳定性。结果表明:MH Ni电池在55℃和-20℃下的1C放电容量衰减率分别为13.6%、12.1%,放电电压平台分别平均降低0.06V、0.13V;在高、低温条件下,电池的循环衰退速度增大,充放电稳定性显著降低。低温条件下,其容量衰减后可在常温时基本恢复到未失效状态,说明该电池在低温和常温间的容量变化具有可逆性;而这种可逆性在高温和常温条件下失效时是不存在的,该现象未见报道。此外,利用电化学交流阻抗谱(EIS)、扫描电镜(SEM)等检测手段分析其电极材料的失效原因。更多还原

【Abstract】 The chargedischarge performance and cycle stability of D size MHNi batteries at different temperature (25℃,55℃,-20℃) were carried out. The results show that the decline rate of MHNi battery discharge capacity at 55℃ and -20℃ were respectively 13.6%, 12.1% and the average discharge voltage decreased 0.06V,0.13V; Cycling stability of MHNi battery were all declined obviously at different temperature. Electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) were introduced to study the main causes of cycling deterioration of MHNi battery in detail. 更多还原