现场电聚合法制备锂二次聚合物电池的研究

基于1,3-二氧戊环(DOL)的可聚合特征, 提出了一种新的聚合物锂二次电池的现场制备方法, 并对其进行研究. 电化学实验表明: 在特定的电流密度下, 仅通过常规的恒电流充放电处理就能实现聚合物锂二次电池的现场组装, 得到的聚合物锂二次电池在电化学性能上与普通液态锂二次电池相当. 紫外-可见光谱表明, 通过一定的电化学处理, DOL能够发生电聚合, 扫描电镜以及交流阻抗测试也证明DOL的聚合不仅实现了液态电解液向聚合态的转变, 而且有助于在电极表面生成较为稳定的聚合物层.

Research of in situ Electro-polymerization Technology Used in Secondary Lithium Polymer Battery

A novel in situ fabrication of polymer lithium secondary batteries was proposed based on 1,3- dioxolane's (DOL) strong inclination to polymerization, and the feasibility of the technique was investigated in detail. Electrochemical measurement showed that under some specified current rate, DOL can readily polymerize into a conductive matter through a routine charge and discharge treatment, and thus an in situ fabrication of polymer lithium secondary batteries was achieved, and it was found that exhibited performance of thus-prepared polymer lithium secondary batteries was comparable to that of a traditional liquid one. UV-Vis spectrum approved the electro-polymerization of DOL under some appropriate electrochemical treatment. SEM and impedance measurement confirmed that a controlled polymerization of DOL not only resulted in the in situ transformation from an original liquid electrolyte to a polymer one, but also helped the establishment of a stable surface layer on the electrode.