Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 42, Pages 25878-25884Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp01020h
Keywords
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Funding
- Materials Processing Science project Materealize'' of the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [JPMXP0219207397]
- High Energy Accelerator Research Organization (KEK) [2019G668, 2021G133]
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The reaction of LiCoO2 (LCO) and Li1.3Al0.3Ti1.7(PO4)3 (LATP) proceeds through multiple steps, as revealed by X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) analysis. The final products are LiCoPO4, CoTiO3, TiO2, and Li3PO4.
The composites of a high-capacity cathode material in lithium-ion batteries, LiCoO2 (LCO) and an oxide-based solid electrolyte, Li1.3Al0.3Ti1.7(PO4)(3) (LATP), were sintered at various temperatures and their reaction products were subsequently identified by X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES). Rietveld analysis of XRD and the linear combination fitting of XANES showed that the reaction of LCO and LATP proceeds via three major steps; from 300 degrees C to 500 degrees C, LCO and LATP react with each other to form Co3O4, amorphous TiO2 and Li3PO4; from 500 degrees C at which crystalline LCO is completely decomposed, LATP reacts not only with remaining amorphous/low crystalline LCO but also with Co3O4 to form LiCoPO4 and TiO2; from 700 degrees C to 750 degrees C, Co3O4 and TiO2 react with each other to form CoTiO3. The final products at 900 degrees C are LiCoPO4, CoTiO3, TiO2, and Li3PO4.
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