Structure analyses of Fe-substituted Li2S-based positive electrode materials for Li-S batteries

Takeuchi T; Kageyama H; Taguchi N; Nakanishi K; Kawaguchi T; Ohara K; Fukuda K; Sakuda A; Ohta T; Fukunaga T; Sakaebe H; Kobayash H; Matsubara E

Solid State Ionics, Vol.320, 387-391, 2018

DOI10.1016/j.ssi.2018.03.028 Export Citation

Structure analyses of Fe-substituted Li2S-based positive electrode materials for Li-S batteries

Takeuchi T, Kageyama H, Taguchi N, Nakanishi K, Kawaguchi T, Ohara K, Fukuda K, Sakuda A, Ohta T, Fukunaga T, Sakaebe H, Kobayash H, Matsubara E

The structure of Fe-substituted Li2S-based positive electrode material Li8FeS5 was analyzed using high-energy Xray total scattering measurements. Pair distribution function (PDF) analyses indicated that the mechanically milled Li8FeS5 sample could best be described as having an anti-fluorite structure in which Fe ions partially occupy Li sites in the Fm (3) over barm unit cell. The electrochemical properties of a cell utilizing Li8FeS5 as the positive electrode were also consistent with this structural model.

Keywords:Fe-substituted lithium sulfide;Low crystalline material;Lithium sulfur battery;Pair distribution function analysis;High capacity