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Sulfide Glass‐Ceramic Electrolytes for All‐Solid‐State Lithium and Sodium Batteries

2014; Wiley; Volume: 5; Issue: 3 Linguagem: Inglês

10.1111/ijag.12084

2041-1294

Masahiro Tatsumisago, Akitoshi Hayashi,

Thermal Expansion and Ionic Conductivity

Sulfide glass‐ceramic electrolytes with L i + or N a + ion conduction have been developed in last decade. High‐temperature phases of L i 7 P 3 S 11 and cubic N a 3 PS 4 are precipitated from mother glasses, and the obtained glass‐ceramics show higher conductivity than the mother glasses. It is difficult to synthesize those high‐temperature phases by conventional solid‐state reaction, and glass electrolytes are thus important as a precursor for forming high‐temperature phases. The highest conductivities at 25°C of 1.1 × 10 −2 S/cm for Li + ion conductor ( L i 7 P 3 S 11 ) and 7.4 × 10 −4 S/cm for Na + ion conductor ( N a 3.06 P 0.94 S i 0.06 S 4 ) are achieved in sulfide glass‐ceramic electrolytes. All‐solid‐state batteries with sulfide glass‐ceramic electrolytes were fabricated by cold press at room temperature. Sulfide electrolytes have favorable mechanical properties to form favorable solid–solid contacts in solid‐state batteries by pressing without heat treatment. All‐solid‐state L i‐ I n/ S and N a‐ S n/ T i S 2 cells using sulfide glass‐ceramic electrolytes operate as secondary batteries and exhibit good cycle performance at room temperature.