open access

https://hdl.handle.net/2115/71347

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

英語

Sulfide

2018-07

The Ceramic Society of Japan

Journal of the Ceramic Society of Japan

126(7)

568-572

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 g(-1) , which was larger than that obtained with 10-100 micron-sized NiPS3 (similar to 90 mAh g(-1)). The XRD patterns of the composite cathode before and after discharge/charge suggested that Li4P2S6 was formed irreversibly (2NiPS(3) + 4Li(+) + 4e(-) -> Li4P2S6 + 2Ni), and this irreversible reaction would reduce the capacity of the cathode. The XANES spectra suggested the oxidation/reduction of Ni during discharge-charge cycles, but the change in the spectra during the cycles was considerably small if one assumed the oxidation/reduction of Ni2+/Ni-0. (C) 2018 The Ceramic Society of Japan. All rights reserved.

学術雑誌論文

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Creative Commons Attribution-NoDerivatives 4.0 International

1882-0743