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| Home > Publications database > All solid state Li battery using garnet structure Ta-substituted Li7La3Zr2O12 as solid electrolyte |
| Home > Publications database > All solid state Li battery using garnet structure Ta-substituted Li7La3Zr2O12 as solid electrolyte |
| Conference Presentation (After Call) | FZJ-2015-02953 |
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2015
Abstract: All solid state Li battery containing oxide-class solid electrolyte is considered to be out stand from their high safety and higher energy density. Compared to the other class the solid Li ionic conductors, oxide-class Li ion conductors have additional advantages of easier material handling during synthesis, higher chemical stability and wider electrochemical window[1-4].In order to realize the using of oxide-class Li ion conductor as solid electrolyte for a Li battery, Ta-substituted Li7La3Zr2O12 (LLZ:Ta) powder had been synthesized via solid state reaction. LLZ:Ta with an optimized sintering parameter exhibits a high Li ion conductivity of 7.8 x 10-4 S cm-1 at 30 oC with a relative density of ~94%. By hot pressing, the relative density of LLZ:Ta was increased to > 99% with an Li ion conductivity of 1.18 x10-3 S cm-1. The material was further implanted as a solid electrolyte by using screen printing to put on LiCoO2 as cathode. Afterward, a metallic Li foil was used as anode by mechanical press onto the pellet. The built Li battery with LLZ:Ta exhibited good charge-discharge utilization of active material up to 80% which equal to a capacity density of ~580 Ah cm-2 at 100 oC. It also exhibited good cycle ability that hundreds of cycle were achieved at temperature of 45 oC. Thus, LLZ:Ta shows as a promising candidate for all solid state Li battery. However, the reduction of high internal resistance of the cell is still maintained as the major challenge to further improvement of the battery performance, especially if the application of this all solid state Li battery is toward room temperature. During this presentation, the material properties of LLZ:Ta, the test results which include microstructure and electrochemical performances from Li battery by using LLZ:Ta and the challenges of building up Li battery by using LLZ:Ta will be discussed.
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