摘要
通过对循环失效电池的解剖研究,发现造成电池失效的主要原因是正极活性物质软化与脱落。通过对失效电池正极板的X射线衍射(XRD)和扫描电镜(SEM)分析,表明:①随着循环的进行,β PbO2的颗粒尺寸逐渐变大,隔板失去弹性,正极板厚度逐渐增加,活性物质颗粒间的接触效果变差,电阻增加,最终导致电池容量的衰减和寿命终结;②大电流充电有利于形成更紧凑的正极活性物质骨架,对正极活性物质表面的结构有影响,有利于延长电池的循环寿命。
The softening and shedding of PAM was the main reasons resulting in battery failureThrough XRD and SEM analysis,it was indicated:①The size of βPbO2 particle became larger,the elasticity of separator lost,the positive plate became thicker with cycling gradually,the contact of PAM particle became worse,the contact resistance of PAM increased and finally the battery capacity decreased and cycle life of battery was end;②The large current of charge was favourable forming more compact frame of PAM, affected the structure of surface of PAM and benefited for extending cycle life of battery
出处
《电池》
CAS
CSCD
北大核心
2003年第2期96-98,共3页
Battery Bimonthly
