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.

Key words: in situ electro-polymerization technology, lithium polymer battery, 1,3-dioxolane, lithium trifluoromethanesulfonimide