The addition of Li7La3Zr1.4Ta0.6O12 (LLZTO) particles to polymer electrolytes can reduce thecrystallinity of polymer materials, promote the migration of lithium ions, and then improve the ionicconductivity of polymer solid electrolytes. Oxide-polymer composite solid electrolytes with differentcontents of LLZTO were prepared from Lithium bis(trifluoromethylsulphonyl)imide (LiTFSI),polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and LLZTO powder as raw materials. Thestudy has found that the solid electrolyte with 15 wt% LLZTO has higher ionic conductivity andmechanical strength, and has a wider electrochemical window (5.5V). The prepared composite cathodeelectrode/solid electrolyte/composite anode electrode solid-state lithium ion battery has a chargedischarge specific capacity of 179.56 mAh/g and 146.73 mAh/g for the first cycle, the coulombicefficiency is of 84%, and the discharge capacity retention rate after 30 cycles is above 94%. Inaddition, the change of impedance before and after the cycle is small, showing good interface stability..
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