Electroc hemical performance of solid state electrolytes consisting of Li6.4La3Zr1.4Ta0.6O12 nanopowders dispersed in polyethylene oxides

doi:10.12028/j.issn.2095-4239.2016.0032

Abstract

Abstract: Compared to the commercial rechargeable lithium batteries using liquid electrolytes, the rechargeable solid state lithium batteries have attracted much attention, since their great potential in high energy density and safety. As the key materials for rechargeable solid state lithium batteries, the solid state electrolytes need to have the high ionic conductivity, wide electrochemical window, superior mechanical properties, stability against Li and ability to suppressing lithium dendrite growth. To meet the above requirements, organic-inorganic hybrid solid state electrolytes membranes with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanopowders and polyethylene oxides (PEO) are prepared. The conductivity and electrochemical properties of PEO-LLZTO and PEO-LiTFSI-LLZTO membranes are comparatively studied. With the insulating PEO, the conductivities of the PEO-LLZTO electrolytes membranes have been greatly improved owing to the percolation effect at the interface, approaching 2×10−4 S/cm at room temperature. Though the conductivity of the PEO-LLZTO electrolytes membranes is slightly lower than that of the PEO-LiTFSI-LLZTO electrolyte membranes (i.e. 6×10−4 S/cm at room temperature), the PEO-LLZTO electrolyte membranes show better electrochemical stability and improved ability of suppressing the lithium dendrite growth. The pouch cells using PEO-LLZTO electrolytes membranes with Li/LiFePO4 and Li/LiFe0.15Mn0.85PO4 show higher energy density, and the batteries can cycle more than 200 times.

Key words: solid state electrolytes, PEOs, LLZTO nanopowders, percolation effect

ZHAO Ning1, LI Yiqiu1, GUO Xiangxin1, ZHANG Jingxian2, DI Zengfeng2. Electroc hemical performance of solid state electrolytes consisting of Li6.4La3Zr1.4Ta0.6O12 nanopowders dispersed in polyethylene oxides[J]. Energy Storage Science and Technology, 2016, 5(5): 754-761.

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