Method For Manufacturing Gel Polymer Electrolyte Secondary Battery And Gel Polymer Electrolyte Secondary Battery Manufactured Thereby

Abstract: A secondary battery according to the present invention has a structure in which the central portion inside contains an electrolyte with a relatively low degree of crosslinking by crosslinking and the central portion is surrounded by the outside portion containing an electrolyte crosslinked to a relatively high degree of crosslinking. These structural features can improve both ionic conductivity and mechanical properties. Furthermore, the leakage of the electrolyte can be prevented since the electrolyte with a low degree of crosslinking is confined by the electrolyte with a high degree of crosslinking. The secondary battery according to the present invention may be simply manufactured by applying a method in which only the outside portion is crosslinked, before the central portion is crosslinked by reaching the crosslinking temperature, in an environment preheated above the crosslinking temperature. Therefore, there is no need to prepare a separate apparatus or equipment line for performing a crosslinking step, leading to no adverse influence in process efficiency.

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