Controllable Li₃PS₄–Li₄SnS₄ solid electrolytes with affordable conductor and high conductivity for solid‐state battery

Abstract

High ionic conductivity, low grain boundary impedance, and stable electrochemical property have become the focus for all-solid-state lithium-sulfur batteries (ASSLSB). One of the approaches is to promote the rapid diffusion of lithium ions by regulating the chemical bond interactions within the framework. The structure control of P 5+ substitution for Sn 4+ on lithium-ion transport was explored for a series of Li 3 PS 4 -Li 4 SnS 4 glass-ceramic electrolytes. Results showed that the grain boundary impedance of the glass electrolyte was reduced after heat treatments. The formation of LiSnPS microcrystals, a good superionic conductor, was detected by X-ray diffraction tests. Electrochemical experiments obtained the highest conductivity of 29.5 S cm −1 at 100 • C and stable electrochemical window from -0.1 to 5 V at 25 • C. In addition, the cell battery was assembled with prepared electrolyte, which is promoted as a candidate solid electrolyte material with improved performance for ASSLSB.

Recent Developments in the Field of Sulfide Ceramic Solid‐State Electrolytes

“…Recent results demonstrate a substantial progress in this field. Regarding tin substitution for germanium, σ RT of 7 [ 40 ] and 4 mS cm −1 [ 41 ] were reported for Li 10 SnP 2 S 12 (LSnPS) SSE, σ RT of 2.1 mS cm −1 was reported for tin‐based glass‐ceramic thio‐LISICON (2.5·Li 3 PS 4 −0.5·Li 4 SnS 4 ), [ 42 ] and σ RT of 2.62 mS cm −1 was reported for the chlorine‐doped Li 9.9 SnP 2 S 11.9 Cl 0.1 (LSnPS–Cl). [ 43 ] Apropos of silicon substitution for germanium, σ RT of 4.28 mS cm −1 was reported for Li 10.35 Si 1.35 P 1.65 S 12 (LSiPS), σ RT of 6.91 mS cm −1 was reported for 1% Co 4+ ‐doped Li 10.35 Si 1.35 P 1.65 S 12 SSE, [ 44 ] Li 10 Si 0.3 Sn 0.7 P 2 S 12 exhibits σ RT ≈ 8 mS cm −1 , [ 45 ] and the outstandingly high σ RT of 25 mS cm −1 was reported for Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 (LSiPS–Cl).…”

High ionic conducting rare-earth silicate electrolytes for sodium metal batteries

“…Table 1 compares the conductivity of various composite solid electrolytes with present NGS15 silicate. [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] Most of the composite solid electrolytes' conductivity was 10 −5 to 10 −7 S cm −1 at RT and high ionic conduction was achieved mainly above 200 °C. Moreover, these composites were developed by a melt-quenching technique, which requires high temperatures (>1300 °C) to melt the precursors.…”

Progress and Perspective of Glass-Ceramic Solid-State Electrolytes for Lithium Batteries

“…In addition to oxides, sulfides including GeS 2 [ 102 ], P 2 S 3 [ 103 ], SnS 2 [ 104 ], Ni 3 S 2 [ 105 ] and LiSnS 4 [ 106 ] can also be used for the doping of LPS glass-ceramic SSEs. (100 − x)(70Li 2 S-30P 2 S 5 )-xFeS 2 glass-ceramic SSEs were prepared by Zhou et al [ 107 ] and then characterized by solid-state NMR.…”