Hybridizing poly(vinylidene fluoride-co-hexafluoropropylene) with Li6.5La3Zr1.5Ta0.5O12 as a lithium-ion electrolyte for solid state lithium metal batteries

By J. Lu, Yanchen Liu, Penghui Yao, Zhiyu Ding, Qiming Tang, Junwei Wu, Ziran Ye, Kevin Huang, Xingjun Liu. Chemical Engineering Journal, 2019

143 citations recorded by the source corpus.

Abstract Polymer/ceramic composite solid electrolyte is an appealing solution for the exploitation of flexible solid-state lithium-metal batteries. Here we report a solid-state Li-ion electrolyte composing of poly(vinylidene fluoride-co-hexafluoro propylene) (PVDF-HFP) polymer, ceramic powder Li6.5La3Zr1.5Ta0.5O12 (LLZTO) and lithium salt LiTFSI. The composite electrolyte exhibits a high ionic conductivity of 8.80 × 10−5 S·cm−1 at room temperature. A coin battery with LiFePO4 cathode is cycled under 0.5 C at room temperature for long cycles, achieving a Coulombic efficiency of 99.6% without virtually capacity loss (1st: 101.4 mAh·g−1 and 500th: 110.9 mAh·g−1). Such excellent performance can be ascribed to the formation of high ionic conductivity by LLZTO active garnet reducing polymer crystallinity. These results show that the developed polymer/ceramic composite has potential to be a high-performance electrolyte for solid-state lithium-metal batteries.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

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