Preparation and performance of PEO/LPOS composite polymer electrolyte

doi:10.12028/j.issn.2095-4239.2016.0025

Abstract

Abstract: A novel free-standing composite electrolyte membranes with high ionic conductivity and good electrochemistry stability is papered through incorporation of sulfide electrolyte 70Li2S-29P2S5-1P2O5 (LPOS) into polyethylene oxide (PEO) matrix. The LPOS particles, acting as active fillers incorporation into the PEO matrix, have a positive effect on the ionic conductivity, lithium ion transference number and electrochemical stability. The lithium ion conductivities of as-prepared composite membranes are evaluated, and the optimal composite membrane incorporating 1% LPOS exhibits an ionic conductivity of 1.60×105 S/cm at room temperature and a maximum ionic conductivity of 1.08×103 S/cm at 80 ℃ and an electrochemical window of 4.7 V. And the LiFePO4/Li battery fabricated with this new composite electrolyte membrane exhibits fascinating cycle performance with high capacity retention. After 50 cycles, the discharge capacity of cell LiFePO4/PEO18-LiTFSI-1%LPOS/Li is 105 mA•h/g at 1 C rate at 60 ℃. It is demonstrated that this new composite electrolyte membrane should be a promising electrolyte applied in solid state batteries based on lithium metal electrode.

Key words: solid polymer electrolyte, lithium superionic conductor, composition, all-solid-state lithium battery

ZHAO Yanran, CHEN Shaojie, TAO Yichen, CHEN Xiaotian, YAO Xiayin, XU Xiaoxiong. Preparation and performance of PEO/LPOS composite polymer electrolyte[J]. Energy Storage Science and Technology, 2016, 5(5): 730-734.

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