Preparation of polymer electrolyte membranes for lithium batteries by radiation-induced graft copolymerization

Preparation of polystyrene-grafted poly(vinylidene fluoride) membranes for lithium secondary batteries

“…The ionic conductivities of PVDF-g-PS membranes increased with the increase in the DOG. This behavior can be generally attributed to the increase in the amorphous polystyrene layer, which can hold more liquid electrolyte with increase in the DOG [7][8][9]. The ionic conductivity reached 2.50 mS/cm for the highest sample at 120% DOG.…”

“…3, the degree of crystallinity was found to decrease with increase in the DOG. The reduction in the degree of crystallinity upon grafting of styrene can be attributed to the dilution of the crystalline PVDF with the amorphous polystyrene [7][8][9]. Fig.…”

“…Although fluoropolymers exhibit relatively good chemical and electrochemical stability, their performance such as electrolyte uptake need to be improved by the use of a grafted copolymerization technique [7][8][9][10][11][12][13]. Graft copolymerization can be achieved by several methods including UV radiation, use of chemical initiator, plasma treatment, and highenergy radiation.…”

“…This technique has many advantages: (i) the polymerization proceeds mildly and thoroughly; (ii) the chemistry of the reaction system is free of contamination; (iii) and the energy consumption is relatively low. Such a versatile nature of this technique is attributed to the ability to control the degree of grafting by proper selection of irradiation conditions [7][8][9][10][11][12][13].…”

Electrochemical performance of methyl methacrylate graft-copolymerized composite separator based on radiation polymerization technique

“…(2) Modification of the polymer host material [8][9][10][11][12][13]: Various polymers matrices, such as polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate (PMMA), and polyethylene oxide, have been used to host the liquid electrolyte. The better performance of PE can be reached by reducing the crystallinity and improving the compatibility with organic electrolytes.…”