Publication date: 21st July 2025
Solid state batteries based on ceramic electrolyte and Li metal electrode represent promising energy storage devices because of their improved safety and energy density compared to current battery technology [1]. Solid oxide electrolytes are attractive due to their chemical stability and convenient handling. Garnet-type oxide (Li7La3Zr2O12) is one candidate material for its reasonably high Li+-ion conductivity and (electro-)chemical stability [2]. In this study Ta-doped Li7La3Zr2O12 layers were produced by highly scalable tape-casting method and tested with Li metal electrode applied by using interfacial treatment. The main hurdle of garnet-based solid electrolytes for their industrial implementation is the poor interfacial contact with the cathode electrodes. Nitrate decomposition method was used to synthesize LiCoO2 directly on the garnet, however the Li excess and temperature were found to be critical on obtaining the hexagonal layered structure of LiCoO2. It was demonstrated by using common half cells with liquid electrolyte that layered LiCoO2 electrode material has superior performance than the low temperature cubic spinel phase and is therefore the desired crystal phase. The phase evolution of LiCoO2 was investigated in direct contact with Ta-doped Li7La3Zr2O12 electrolyte by using Variable Temperature XRD to find the optimum processing conditions for manufacturing the positive electrode. Li/Ta-doped Li7La3Zr2O12/LiCoO2 solid state cells were assembled and their performance was evaluated. Additional EIS analysis was performed for the battery cells.
This work is supported by UK Japan Energy Storage Research Fellowship scheme.
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