Work

Development of nitrogen-containing sulfide solid electrolytes with high ionic conductivity and water resistance

Year: 2025

Type: article

Abstract: In general, sulfide solid electrolytes exhibit high ionic conductivity among inorganic solid electrolytes. However, solid sulfide electrolytes have low water resistance. The objective of this study was to develop sulfide solid electrolytes with high ionic conductivity and water resistance using nitrides. Among sulfide solid electrolytes, the 70Li2S·30P2S5 glass-ceramic has high Li-ion conductivity. However, it has poor stability against moisture. In this study, composite solid electrolytes of the 70Li2S·30P2S5 glass-ceramic incorporating Li3AlN2 were prepared to improve the stability against moisture while maintaining high ionic conductivity. Glass-ceramic solid electrolytes with the composition (100–x)(0.70Li2S·0.30P2S5)·xLi1.5Al0.5N were synthesized via mechanical milling and consecutive heat treatment above their crystallization temperature. The 80(0.70Li2S·0.30P2S5)·20Li1.5Al0.5N (LPASN20) glass-ceramic exhibited a conductivity of 1.7 mS cm−1 at 25 °C and excellent stability against moisture. Compositions with halide substitutions in the LPASN20 glass-ceramic were investigated to increase the ionic conductivity. The 80{0.80(0.70Li2S·0.30P2S5)·0.20Li1.5Al0.5N}·12LiBr·8LiI (LPASNBrI) glass-ceramic exhibited a high conductivity of 4.7 mS cm−1 at 25 °C and excellent stability against moisture. The charge–discharge performance of an LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode with LPASNBrI was evaluated. The LPASNBrI glass-ceramics were sufficiently stable for application to NCM cathodes. The LPASNBrI glass-ceramic has not only high ionic conductivity but also excellent chemical stability.

Source: Journal of Alloys and Compounds Communications

DOI: 10.1016/j.jacomc.2025.100135

Authors: Akihiro Fukushima, Katsuya Nishii, Motoshi Suyama, Tadashi Kakeya, Shigeki Yamate, Takashi Aoki

Institution: GS Yuasa (Japan)

Language: English

Topic: Advanced Battery Materials and Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $2,000