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Preparation of Spherical-like and Honeycomb LiCe_(0.1)Ca_(0.8)TiO_3 and Its Applications in Polymer Electrolytes for Li-ion Battery

Wei Xiao  Chang Miao  Xueming Yan  Ping Mei  
【摘要】:The spherical-like and honeycomb LiCe_(0.1)Ca_(0.8)TiO_3 particles are successfully synthesized by sol-gel and spray-drying combined with following pyrolysis processes. The P(VDF–HFP)-based composite polymer electrolyte(CPE) membrane doped with the particle was prepared by phase inversion method and the desirable CPE was obtained after being activated in liquid electrolyte. The physicochemical properties of the CPE were characterized by SEM, XRD, TG, and electrochemical measurements. The results show that the CPE membrane presents uniform surface with abundant interconnected micro-pores and possesses excellent mechanical performance with high decomposition temperature about 450 ℃; and adding LiCe_(0.1)Ca_(0.8)TiO_3 particle into matrix can remarkably decrease the crystallinity but enhance ionic conductivity at room temperature of the CPE membrane about 4.021 m S cm~(-1); and the reciprocal temperature dependence of ionic conductivity of as-prepared CPEs follows VTF relationship. The interfacial resistance of the assembled Li/CPE/Li cell can rapidly increase to a steady value of about 835 ? cm~(-1) from the initial value of about 685 ? cm~(-1) at 30 ℃ during 15 days storage at room temperature. The battery performance test suggests that the CPE also shows excellent compatible properties with commercial LiCoO_2 and graphite materials.

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