SULFIDE-BASED SOLID ELECTROLYTE, METHOD FOR PREPARING SULFIDE-BASED SOLID ELECTROLYTE, AND ALL-SOLID-STATE BATTERY COMPRISING SULFIDE-BASED SOLID ELECTROLYTE

• Main Authors: MATSUBARA, Keiko, NARIMATSU, Eiichiro, IKENOMOTO, Shun
• Format: Patent
• Language: English; French; Korean
• Published: 22.08.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The objective of the present invention is to provide a sulfide-based solid electrolyte having improved lithium ionic conductivity, a method for preparing the sulfide-based solid electrolyte, and an all-solid-state battery comprising the sulfide-based solid electrolyte. The present invention provides a sulfide-based solid electrolyte that is a glass ceramic, the sulfide-based solid electrolyte comprising a thio-LISICON Region Ⅱ-type crystalline phase, and having a chemical formula presented by (100-x){(0.75+y/(100-x))Li2S-0.25P2S5}-xLiHa, wherein In the chemical formula, Ha is one or more elements selected from halogen elements and satisfies 15≤x≤30 and 0<y<2.25. La présente invention concerne : un électrolyte solide à base de sulfure présentant une conductivité ionique améliorée, un procédé pour la préparation de l'électrolyte solide à base de sulfure, et une batterie tout solide comprenant l'électrolyte solide à base de sulfure. La présente invention concerne un électrolyte solide à base de sulfure qui est une vitrocéramique, l'électrolyte solide à base de sulfure comprenant une phase cristalline de type thio-LISICON Region II, et ayant une formule chimique présentée par (100-x) {(0.75+y/(100-x))Li2S-0.25P2S5}-xLiHa, dans laquelle formule chimique, Ha représente un ou plusieurs éléments choisis parmi les éléments halogènes et satisfait l'expression 15 ≤ x ≤ 30 et 0 < y < 2,25. 리튬 이온 전도율이 향상된 황화물계 고체 전해질, 황화물계 고체 전해질의 제조 방법, 및 황화물계 고체 전해질을 포함하는 전고체 전지를 제공하는 것을 목적으로 한다. 본 발명은, 유리 세라믹스인 황화물계 고체 전해질로서, 상기 황화물계 고체 전해질은 thio-LISICON Region Ⅱ 타입의 결정상을 포함하고, (100-x){(0.75+y/(100-x))Li2S-0.25P2S5}-xLiHa로 표시되는 화학식을 갖고, 상기 화학식에서, 상기 Ha가 할로겐 원소로부터 선택되는 1종 이상의 원소이며, 15≤x≤30, 0＜y＜2.25를 만족하는, 황화물계 고체 전해질을 제공한다.