Investigation on degradation of storage characteristics of Ni MH batteries
- 化学化工－已发表论文 
考察了国产金属氢化物-镍电池充放电性能以及电池内阻、隔膜电阻和充电过程中产气量等参数随电池储存时间的变化。通过SEM和XPS分析了电极和隔膜表面形貌及组成的改变，初步讨论了国产电池储存性能下降的原因。结果表明，随着储存期延长，电池放电容量，尤其1.1A电流下放电容量衰退较大，内阻及隔膜电阻增大，充电过程中电池内产气量剧增时间提前，同时正极膨胀变形，隔膜纤维变粗，孔隙减小，且有杂质嵌入，负极表面有氟元素富集。另外，负极表面的氧化作用随储存期延长而加强Changes in the charging discharging perFormance of the Ni MH batteries made in China and related parameters such as internal impedance, gas evolution volume of the battteries during charging process and separator resistance in diFFerent periods of storage are investigated in this paper. The surFace morphology and composition changes of the electrodes and separators have been analyzed through SEM and XPS technique. The reasons For degradation of storage characteristics of the batteries are discussed. The results show that, with increase in storage period, the discharge capacity, especially when discharging current is 1.1A, degrades seriously, the internal resistance of batteries and separator resistance increase, the gas evolution becomes serious, the positive electrode materials and the separator Fiber swell and deForm, the holes of separator become smaller with impurities in it and with the increase of the storage period the oxidation on negative electrode is strengthened.