Corresponding Author

Wen-Hong RUAN(cesrwh@mail.sysu.edu.cn)


Based on the chemical characteristics of the hydroxyl group of PVA side-chain, the hyperbrandched poly(amine-ester) (HBPAE) was used to hypergraftingly pretreated nano-silica (SiO2) and polyving akohol (PVA). And different lithium salts were added to fabricate the SiO2-g-HBPAE/PVA-g-HBPAE hyperbrandched/comb-like composite polymer electrolytes (CPEs). The dispersion of nanoparticles in matrix was observed by SEM. The effects of different lithium salts on the properties of CPEs were studied by DSC, tensile test and dielectric spectra. The results showed that the hypergrafting method improved the interphase compatibility between SiO2 and matrix. Sulfonic acid type lithium salts accelerated self-plasticizing with the Tg values being decreased. The LiClO4 manifested stronger solubility than LiCF3SO3 and LiN(SO3CF3)2 in the polymer matrices. The ionic conductivity of the polymer electrolytes reached the maximum value of 2.58×10-6 S·cm-1 after the addition of 20% LiCF3SO3 at room temperature.

Graphical Abstract


polymer electrolytes; polyving akohol, hyperbrandched poly(amine-ester), comb-like polymer, lithium salts

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