Congratulations to Huanhuan Jia as the first author for a paper accepted by the Journal of Energy Chemistry! The title of the paper is “Na3.8[Sn0.67Si0.33]0.8Sb0.2S4: A quinary sodium fast ionic conductor for all-solid-state sodium battery”

Abstract

Strategy of Sb-substitution is carried out on the template structure Na₄Sn_0.67M_0.33S₄(M= Si, Ge), which affords a series of quinary sulfide-based sodium fast ionic conductors formulated as Na_4-x[Sn_0.67M_0.33]_1-xSb_xS₄(M= Si,x= 0.1, 0.2, 0.3;M= Ge,x= 0.2.). Among them, the highest ambient ionic conductivity (1.75 × 10⁻⁴S cm⁻¹) is achieved whenM= Si andx= 0.2. The new fast ionic conductor Na_3.8[Sn_0.67Si_0.33]_0.8Sb_0.2S₄is isostructural to its structure template Na₄Sn_0.67Si_0.33S₄and thus crystallizes in the space group ofI4₁/acd. It is shown that the incorporation of Sb improves the ionic conductivity. The study of lattice parameters shows that the improvement of the ion conductivity by Sb-substitution is mainly due to the enlarged crystal lattice. Furthermore, using Na_3.8[Sn_0.67Si_0.33]_0.8Sb_0.2S₄as solid electrolytes, room temperature all-solid-state sodium battery of Se_0.05S_0.95@pPAN/Na₃Sn is realized, which proves the novel fast ionic conductor a potential candidate to apply in sodium solid state battery. This work not only extends the scope of Na₄[Sn_0.67Si_0.33]S₄, the I4₁/acd space group template, but also deepens the understanding of the lattice size effect on the structure and property relationship by aliovalent substitution.

https://www.sciencedirect.com/science/article/pii/S2095495619309428?dgcid=rss_sd_all