Microstructure and electrochemistry performance of the composite electrode prepared by spark plasma sintering |
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| Affiliation: | 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China;2. School of Engineering, Faculty of Applied Science, University of British Columbia, Kelowna, BC V1V 1V7, Canada;1. Ceramic Research Centre of Saga University, 2441–1 Oono-otsu, Arita-cho, Nishimatsuura-gun, Saga 844–0013, Japan;2. Faculty of Art and Regional Design, Saga University, 1 Honjo-cho, Saga 840–8502, Japan;3. Saga Ceramics Research Laboratory, 3037–7 Hei Kuromuta Arita-Cho, Nishimatsuura-gun, Saga 844–0022, Japan;4. Centre of Advanced Instrumental Analysis, Kyushu University, Fukuoka 816–8580, Japan;1. Advanced Materials Center, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, 80-233 Gdańsk, ul. Narutowicza 11/12, Poland;2. National Synchrotron Radiation Centre SOLARIS, Jagiellonian University, Czerwone Maki 98, 30-392 Kraków, Poland;3. Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. A. Mickiewicza, 30-059 Kraków, Poland;4. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 1, Section 3, Zhongxiao E. Rd., Taipei 106, Taiwan;5. Advanced Materials Center, Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, 80-233 Gdańsk, ul. Narutowicza 11/12, Poland;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, PR China;2. Stake Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China;1. Department of Research and Development, SHOFU INC., Higashiyama-ku, Kyoto, Japan;2. Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;3. Department of Mechanical Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;4. Ceramic Physics Laboratory, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan |
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| Abstract: | The 30%LiFePO4-55%Li1.5Al0.5Ge1.5(PO4)3-15%C composite electrodes were successfully prepared by spark plasma sintering, and the microstructure and electrochemistry performance were investigated. As sintered at 550 °C, the phase structure of the composite electrode remained unchanged. With the sintering temperature increasing, the Li1.5Al0.5Ge1.5(PO4)3 were decomposed and transformed into nanocrystals and impurity phases of AlPO4 and GeO2. The 3D-microstructure showed that abundant pores existed in the composite electrodes. The volume fraction and connectivity of these pores decreased with the sintering temperature. The initial discharge capacity of the composite electrode was 138 mAh·g?1 as sintered at 550 ℃, while it decreased monotonously with the sintering temperature. The decrease was related with the formation of impurities and closed pores. Moreover, the composited electrode sintered at 550 ℃ had severely capacity fading during electrochemistry cycles. By the EIS and postmortem analyses, it was determined that the capacity fading was due to the ion transport failure caused by the cracking during cycles. |
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| Keywords: | Composite electrode 3D reconstruction Spark plasma sintering |
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