Abstract
NASICON-type fast ion conductor powders Li1.3Al0.3Ti1.7(PO4)3 (LATP) are prepared by spray-drying and sintering processes confirmed by XRD and SEM analyses. Novel poly(vinylidene fluoride-hexafluoropylene) (P(VDF-HFP))-based composite polymer electrolytes (CPEs) doped with various amounts of LATP particles are fabricated via classical inverse-phase method. As a result, the as-prepared CPE-5 membrane can present excellent physicochemical properties when the doped amount is maintained at 5% vs. polymer matrix, in which the interfacial impedance value can rapidly stabilize at 472 Ω and the thermal decomposition temperature can be up to 430 °C, respectively. In particularly, the ionic conductivity can be as high as 3.943 mS cm−1 at 25 °C. In addition, the assembled LiCoO2/CPE-5/Li coin cell can deliver a discharge specific capacity of 145.4 mAh g−1 at 1.0 C with 96.93% capacity retention ratio after 25 cycles. These outstanding properties can promote the CPE-5 to be a candidate electrolyte to improve the performance of lithium ion batteries.
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