Improvement of the rate capability of all-solid-state cells with Fe-based polysulfide positive electrode materials by modifying the microstructure

Tomonari Takeuchi; Noboru Taguchi; Mitsunori Kitta; Toyonari Yaji; Misae Otoyama; Kentaro Kuratani; Hikari Sakaebe

doi:10.1039/d3ra08641k

Improvement of the rate capability of all-solid-state cells with Fe-based polysulfide positive electrode materials by modifying the microstructure

RSC Adv. 2024 Feb 28;14(10):7229-7233. doi: 10.1039/d3ra08641k. eCollection 2024 Feb 21.

Authors

Tomonari Takeuchi¹, Noboru Taguchi¹, Mitsunori Kitta¹, Toyonari Yaji², Misae Otoyama¹, Kentaro Kuratani¹, Hikari Sakaebe^{1

3}

Affiliations

¹ National Institute of Advanced Industrial Science and Technology (AIST) Midorigaoka 1-8-31, Ikeda Osaka 563-8577 Japan takeuchi.tomonari@aist.go.jp.
² Synchrotron Radiation Center, Ritsumeikan University Kusatsu Shiga 525-8577 Japan.
³ Kyushu University 6-1 Kasuga koen Kasuga-shi Fukuoka 816-8580 Japan.

Abstract

We successfully prepared an Fe- and Li-containing polysulfide positive electrode material (Li₈FeS₅-Li₂FeS₂ composite) that shows a high specific capacity (>500 mA h g^-1) with improved rate capability in all-solid-state cells. High-resolution TEM analysis indicated the coexistence of small crystallites of high-conductivity Li₂FeS₂ and FeS, as well as low-crystallinity Li₂S, in the composite, and this microstructure is responsible for the improved battery performance.