화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.166, No.13, A2755-A2761, 2019
Crosslinked Gel Polymer Electrolytes for Si Anodes in Li-Ion Batteries
Gel polymer electrolyte (GPE) membrane was prepared by the facile amine-epoxy crosslinking reaction of poly(ethylene glycol) diglycidylether (PEGDE) with diamino-poly(propylene oxide) (DPPO) and subsequent immersion in 1 M LiPF6 solution. To apply GPE for Si anode in a Li-ion battery, the physical properties were optimized by the degree of crosslinking which was controlled by molecular weight of each part. The crosslinked GPE membrane composed of PEGDE(1,000 g mol(-1)) and DPPO (4,000 g mol(-1)) exhibited desirable dimensional stability, low electrical resistance, adequate ionic conductivity of 1.0 mS cm(-1) at 25 degrees C. The Si anode cell employing this GPE exhibited enhanced battery performance of 2,434 mAhg(-1) and 80% cyclic retention after 100 cycles. The well-optimized cGPE with desirable physical properties could resolve the issues of safety and stability resulted from volume expansion of Si as well as Li dendrite formation. (C) 2019 The Electrochemical Society.