Organic/inorganic hybrid membranes based on (3-glycidoxypropyl) trimethoxysilane (GPTMS) and ethylene glycol diglycidyl ether (EGDE), have been prepared by sol-gel method and organic polymerization as solid electrolytes for Li-ion batteries. Lithium bis(trifluoromethane)sulfonamide (LiTFSI) was used as Li salt. FTIR and Raman spectroscopies were used to confirm the hybrid structure formation and the interactions between Li ions and hybrid network. An Arrhenius-like temperature dependence of ionic conductivity was observed for solid hybrid electrolyte membranes, suggesting that the diffusion of charge carriers was assisted by the segmental motions of the organic network. The Li-ion transfer number was determined and correlated with their ionic conductivities. Maximum ionic conductivities for the solid hybrid electrolyte membrane with LiTFSI and a [Li + ]/[O] = 0.10 (class II hybrid) of 1.1 10-5 S/cm was obtained at room temperature. A good value of electrochemical stability window (7 V) and an excellent high rate performance after 500 cycles make these hybrids materials a promising electrolyte candidate for all-solid-state lithium battery applications.

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Organic–inorganic hybrid solid electrolytes based on silica–polyethylene glycol PEG(200, 400) with bis­(trifluoromethane)­sulfonimide lithium salt (LiTFSI) or lithium trifluoromethanesulfonate (LiOTf) were synthesized by a sol–gel process. The thermal and structural properties of the materials thus obtained were systematically investigated by a variety of techniques including SEM, TGA-DTA, DSC, FTIR, Raman, and multinuclear (1H, 13C, 7Li) solid-state NMR. Arrehenius behavior was observed for solid hybrid electrolyte membranes, implying that segmental motions of the organic network were involved in ionic conductivity. The Li-ion transfer number was determined and correlated with their ionic conductivities, and the interfacial stability against lithium was evaluated. Maximum ionic conductivities for the solid hybrid electrolyte membrane SiO2–PEG400 with LiTFSI and a [Li+]/[O] = 0.10 (class II hybrid) of 3.9 × 10–4 and 4.5 × 10–3 S/cm–1 were obtained at room temperature and 60 °C, respectively. The good value of electrochemical stability window (∼6 V) and stable interfacial impedances against lithium metal make these hybrid electrolytes a promising candidate for all-solid-state lithium battery applications.

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