Study On Preparation Of P(AN-MMA)/SiO₂ Hybrid Solid Polymer Electrolytes By Sol-Gel Method

The synthesis and conductivity of poly(acrylonitrile-methyl methacrylate) [P(AN-MMA)]/SiO₂ hybrid polymer solid electrolytes were studied in this paper.Basing on sol-gel method, [P(AN-MMA)]/SiO₂ hybrid materials were prepared from AN, MMA and tetraethyl orthosilicate (TEOS) with 3-methacryloxypropyl -trimethoxysilane(KH570) as silane coupling agent. The best preparation conditions were researched and the relative result products were characterized by FT-IR, XPS, DSC, XRD. The results indicated that SiO₂ combined with P(AN-MMA) by Si-O-Si. Compare with pure P(AN-MMA) material, P(AN-MMA)/SiO₂ hybrid material was amorphous as the same as P(AN-MMA), but the glass transition temperature of P(AN-MMA)/SiO₂ hybrid material is higher than that of P(AN-MMA) and increases with increase of silica content. These performance improved the conductivity of the electrolytes.LiClO₄ was added into P(AN-MMA)/SiO₂ hybrid materials,The result of AC impedance indicated: ionic conductivities of [P(AN-MMA)]/SiO₂ can reach 10-3-10-4S·cm-1 at room temperature, the ionic conductivities of [P(AN-MMA)]/SiO₂ solid electrolytes were significantly improved with the increase of SiO₂ or the increase of LiClO₄, but when the amount of SiO₂ or LiClO₄ exceeded a certain value, the ionic conductivity was decreased. the electrochemical window of the electrolytes indicated that P(AN-MMA)/SiO₂ hybrid solid polymer electrolyte meet the performance need of lithium-ion batteries.