Synthesis of submicron-sized NiPS3 particles and electrochemical properties as active materials in all-solid-state lithium batteries

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Abstract

Submicron-sized NiPS3 particles were synthesized by heating fine Ni powder (<100 nm), red phosphorus, and sulfur at 673 K for 48 h, and their electrochemical properties as cathodes in sulfide-based all-solid-state lithium batteries were investigated using discharge/charge measurements, X-ray diffraction (XRD) measurements, electrochemical impedance spectroscopy, and X-ray absorption near-edge structure spectroscopy (XANES). Batteries using submicron-sized NiPS3 as a cathode active material exhibited a 10th discharge capacity of 147 mAh g11, which was larger than that obtained with 10100 micron-sized NiPS3 (390 mAh g11). The XRD patterns of the composite cathode before and after discharge/charge suggested that Li4P2S6 was formed irreversibly (2NiPS3 + 4Li+ + 4e1 ¼ Li4P2S6 + 2Ni), and this irreversible reaction would reduce the capacity of the cathode. The XANES spectra suggested the oxidation/reduction of Ni during dischargecharge cycles, but the change in the spectra during the cycles was considerably small if one assumed the oxidation/reduction of Ni2+/Ni0

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Suto, Y., Fujii, Y., Miura, A., Rosero-Navarro, N. C., Higuchi, M., & Tadanaga, K. (2018). Synthesis of submicron-sized NiPS3 particles and electrochemical properties as active materials in all-solid-state lithium batteries. Journal of the Ceramic Society of Japan, 126(7), 568–572. https://doi.org/10.2109/jcersj2.18011

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