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8. Improving the electrochemical performance of Li2S cathodes based on point defect control with cation/anion dual doping.

Author

Pan, Wenli, Yamamoto, Kentaro, Machida, Nobuya, Matsunaga, Toshiyuki, Kumar, Mukesh, Thakur, Neha, Watanabe, Toshiki, Sakuda, Atsushi, Hayashi, Akitoshi, Tatsumisago, Masahiro, and Uchimoto, Yoshiharu

Abstract

Li2S is a promising cathode candidate for all-solid-state batteries (ASSBs) because of its high theoretical capacity and availability for coupling with a Li-free anode or an anode-less electrode. However, ionically insulating Li2S leads to excess conductive additives, low sulfur utilization and sluggish kinetics, which hinders the implementation of high energy density potential by ASSBs. Improving the intrinsic conductivity of Li2S is the key to solve this issue. In this study, PI3-doped Li2S cathodes were fabricated and the relationship between lithium vacancies and ionic conductivities was examined quantitatively by the time-of-flight (TOF) neutron diffraction. By cation–anion dual doping, the ionic conductivities of Li2S–PI3 materials were improved to 10−4 S cm−1, which is desirable for the cathode without solid electrolytes added. Upon simply mixing with carbon, the Li2S–PI3–C cathode shows a high overall cathode capacity of 541 mA h g−1 with a high S utilization of 82% at 0.05C and a capacity of 207 mA h g−1 at 1C at room temperature, realizing high energy density with good rate performance. [ABSTRACT FROM AUTHOR]

Published
2023
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29. Liquid-phase syntheses of sulfide electrolytes for all-solid-state lithium battery

Author

1000010603201, Miura, Akira, Rosero-Navarro, Nataly Carolina, Sakuda, Atsushi, 1000090244657, Tadanaga, Kiyoharu, Phuc, Nguyen H. H., Matsuda, Atsunori, Machida, Nobuya, Hayashi, Akitoshi, Tatsumisago, Masahiro, 1000010603201, Miura, Akira, Rosero-Navarro, Nataly Carolina, Sakuda, Atsushi, 1000090244657, Tadanaga, Kiyoharu, Phuc, Nguyen H. H., Matsuda, Atsunori, Machida, Nobuya, Hayashi, Akitoshi, and Tatsumisago, Masahiro

Abstract

Solid sulfide electrolytes are key materials in all-solid-state lithium batteries because of their high lithium-ion conductivity and deformability, which enable the lithium-ion path to be connected between the material’s grain boundaries under pressure near room temperature. However, sulfur species are moisture-sensitive and exhibit high vapour pressures; therefore, syntheses of sulfide electrolytes need to be carefully designed. Liquid-phase reactions can be performed at low temperatures in controlled atmospheres, opening up the prospect of scalable processes for the preparation of sulfide electrolytes. Here, we review liquid-phase syntheses for the preparation of sulfide-based solid electrolytes and composites of electrolytes and electrodes, and we compare the charge–discharge performances of the all-solid-state lithium batteries using these components.

Published
2019

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