Zn-PANi二次电池循环寿命影响因素

Studies on the influence factors of the cyclic life for Zn-PANi secondary batteries

为研究Zn-聚苯胺二次电池的循环寿命影响因素,通过电化学方法,研究正极材料过充降解、负极钝化、枝晶形成、集流体腐蚀和电解液干涸5个因素对Zn-PANi电池循环寿命的影响.测试结果表明:负极形成枝晶引起电池短路是主要影响因素,使电池只有70个循环的寿命.其次,电池过充、正极材料降解导致电池的自放电,直接降低电池的循环寿命.此外,电解液干涸、负极钝化和集流体的选择均对电池的循环寿命产生不同程度的影响.

In order to research the Zn-polyaniline secondary battery life cycle impact factors,the five factors of influence on the cyclic life for Zn-PANi secondary batteries have been investigated electrochemically,which include materials degradation of the positive electrode due to overcharge,passivation of the negative electrode,dendrite formation,corrosion of the current collector and drying up of the electrolyte.The test results indicate that the main influence factor is the short-circuit aroused by the dendrite formation on the negative electrode,which enable the battery to have the life of only 70 cycles.Secondly,the degradation of positive electrode by over charge causes the self-discharge of battery,which reduces the battery cycle life significantly.In addition,the drying up of electrolyte,the passivation of the negative electrode and the choice of the current collector,all these bring about influences to the cycle life of battery to a certain extent.