Surface modification of Li3PO4 to Li1.3Al0.3Ti1.7(PO4)3 by wet chemical process and its sintering behavior

Kento Ishii; Yuri Taniguchi; Akira Miura; Shogo Miyoshi; Kazunori Takada; Go Kawamura; Hiroyuki Muto; Atsunori Matsuda; Masayoshi Fuji; Tetsuo Uchikoshi

doi:10.2109/jcersj2.23208

Article Surface modification of Li₃PO₄ to Li_1.3Al_0.3Ti_1.7(PO₄)₃ by wet chemical process and its sintering behavior

Kento Ishii ; Yuri Taniguchi ; Akira Miura ; Shogo Miyoshi (National Institute for Materials Science) ; Kazunori Takada (National Institute for Materials Science) ; Go Kawamura ; Hiroyuki Muto ; Atsunori Matsuda ; Masayoshi Fuji ; Tetsuo Uchikoshi (National Institute for Materials Science)

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Kento Ishii, Yuri Taniguchi, Akira Miura, Shogo Miyoshi, Kazunori Takada, Go Kawamura, Hiroyuki Muto, Atsunori Matsuda, Masayoshi Fuji, Tetsuo Uchikoshi. Surface modification of Li₃PO₄ to Li_1.3Al_0.3Ti_1.7(PO₄)₃ by wet chemical process and its sintering behavior. Journal of the Ceramic Society of Japan. 2024, 132 (6), 23208. https://doi.org/10.2109/jcersj2.23208

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The surface modification of lithium phosphate on lithium alumina titanium phosphate (LATP) by a wet chemical method densified the LATP to over 90% at a sintering temperature of 800 °C. This temperature was approximately 300 °C lower than that of LATP without additives. Densification of LATP with lithium phosphate significantly progressed from 700°C to 800°C, and endothermic peaks corresponding to its melting were found in a similar temperature range, suggesting that the densification mechanism would be due to liquid phase sintering. The liquid phase of Li3PO4 is produced by a multi-step thermal decomposition involving the reaction with LATP. The sintered LATP with lithium phosphate showed a density of about 90% and the highest ionic conductivity of 3.5×10-4 S/cm at 25 °C, suggesting an excellent Li ion conducting, solid electrolyte material.

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