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The polymer blend membranes were prepared by the phase-separation method. Poly(vinylidene fluoride) (PVDF,Mw = 534,000, Sigma¨CAldrich) and poly(methyl methacrylate)(PMMA, Mw = 350,000, Sigma¨CAldrich) were dried for 24 h at
100 ◦C in vacuum. The required amounts of PVDF and PMMA were dissolved in a mixture of N,N-dimethyl formamide (DMF, >99.8%,Sigma¨CAldrich) and glycerin (Fluka) (10:1 by volume), and stirred for 3 h at 80 ◦C. Then, the solution was cast onto a glass plate and dried at 120 ◦C for 24 h in vacuum. During this process, DMF and glycerin evaporated in turn, and the voids left by the glycerin
formed micropores. The polymer electrolytes were obtained by soaking the obtained membranes in 1 M LiPF6 in a mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC; 1:1 by volume, MERCK, Germany). The compositions of the PVDF/PMMA membranes and the corresponding polymer electrolytes that were prepared are listed in Table 1. M0, M30, M50. M70, M90, and M100
designate the membranes with PVDF to PMMA (wt.%:wt.%) weight ratios of 100:0, 70:30, 50:50, 30:70, 10:90, and 0:100, respectively.The corresponding polymer electrolytes are designated as E0, E30,E50, E70, E90, and E100, respectively.
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