SOLID ELECTROLYTE, ALL-SOLID BATTERY USING THE SAME AND METHOD FOR PRODUCING SOLID ELECTROLYTE

• Main Authors: TAKIZAWA HIROTANE, ASARI YUSUKE, KAWAJI JUN, FUJIEDA TADASHI, HAYASHI YAMATO
• Format: Patent
• Language: English; Japanese
• Published: 30.06.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CONDUCTORS; ELECTRICITY; INSULATORS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES

PROBLEM TO BE SOLVED: To provide a solid electrolyte having a ramsdellite-type crystal structure that has a low diffusion barrier wall of lithium ion and has good lithium ion conductivity.SOLUTION: The solid electrolyte has a ramsdellite-type crystal structure 100, is represented by the formula: LiSnM(II)M(III)M(V)M(VI)O[M(II) is a bivalent cation; M(III) is a trivalent cation; M(V) is a pentavalent cation; M(VI) is a hexavalent cation; and 0≤x≤1.33] and in the formula, satisfies the relationship of 0<a+b+c+d, 0≤a+b≤x, 0≤c+d<0.9 and 3x-a-2b-c-2d≤2. An all-solid battery includes the solid electrolyte in at least one layer of a positive electrode layer, a negative electrode layer and a solid electrolyte layer. A method for producing the solid electrolyte includes a step of preparing a mixed powder as a raw material and a step of sintering the mixed powder by microwave heating.SELECTED DRAWING: Figure 1 【課題】リチウムイオンの拡散障壁が低く、リチウムイオン伝導性が良好なラムスデライト型結晶構造を有する固体電解質の提供。【解決手段】ラムスデライト型の結晶構造１００を有し、式Ｌｉ４ｘ−２ａ−３ｂ−ｃ−２ｄＳｎ４−ｘ−ｃ-ｄＭ(II)ａＭ(III)ｂＭ(V)ｃＭ(VI)ｄＯ８［Ｍ(II)は二価のカチオン；Ｍ(III)は三価のカチオン；Ｍ(V)は五価のカチオン；Ｍ(VI)は六価のカチオン；０≦ｘ≦１．３３］で表され、前記式において、０＜ａ＋ｂ＋ｃ＋ｄ、０≦ａ＋ｂ≦ｘ、０≦ｃ＋ｄ＜０．９、且つ、３ｘ−ａ−２ｂ−ｃ−２ｄ≦２の関係を満たす固体電解質。前記固体電解質を正極層、負極層及び固体電解質層のうち一以上の層に含む全固体電池。原料となる混合粉末を調製する工程、混合粉末をマイクロ波加熱によって焼成する工程を含む固体電解質の製造方法。【選択図】図１