Toyota Jidosha Kabushiki Kaisha

Kureha Corporation

Naoki Osada

Shigenori Hama

Ayano Kobayashi

Tomoya Suzuki

Heidy Hodex Visbal Mendoza

Erika Oki

Yoshiyuki Nagasawa

Shohei Kawashima

Mitsuyasu Sakuma

Ryosuke Furuya

The all-solid-state battery includes a positive electrode layer, a separator layer, and a negative electrode layer. The separator layer includes a sulfide solid electrolyte. In a cross section parallel to the thickness direction of the separator layer, a line analysis is performed by SEM-EDX to measure an atom concentration of sulfur and an atom concentration of iodine on a straight line extending from the negative electrode layer to the positive electrode layer in parallel to the thickness direction. A regression line is derived from the results of the line analysis, and the regression line has a slope of 0.019 to 0.036. The independent variable of the regression line is a position in the thickness direction of the separator layer. The dependent variable of the regression line is a ratio of the atom concentration of iodine to the atom concentration of sulfur.

All-solid-state battery

Provided is a method for producing a sulfide-based solid electrolyte with a balance between the ion conductivity of the sulfide-based solid electrolyte and the heat generation amount of an electrode layer containing the sulfide-based solid electrolyte during an electrode reaction. Disclosed is a method for producing a sulfide-based solid electrolyte comprising a sulfide glass-based material that contains at least one lithium halide compound selected from the group consisting of LiI, LiBr and LiCl, the method comprising immersing the sulfide glass-based material, which is at least one sulfide glass-based material selected from the group consisting of a sulfide glass and a glass ceramic, in an organic solvent having a solubility parameter of 7.0 or more and 8.8 or less, for 1 hour to 100 hours.

Sulfide-based solid electrolyte, method for producing the sulfide-based solid electrolyte, and method for producing all-solid-state battery

A binder composition includes a dispersion medium and a group of binder particles. The group of binder particles is dispersed in the dispersion medium. The group of binder particles include a polymer material. The polymer material includes a constitutional unit originated from vinylidene difluoride. The group of binder particles has a number-based particle size distribution. The particle size distribution satisfies the following conditions: '0.19≤X≤0.26', “0.69≤Y≤0.76”, and “0≤Z≤0.05”. Here, “X” represents a frequency of particles each having a particle size of less than or equal to 40 μm. “Y” indicates a frequency of particles each having a particle size of more than 40 μm and less than or equal to 110 μm. “Z” indicates a frequency of particles each having a particle size of more than 110 μm and less than or equal to 250 μm.

Binder composition, method of producing binder composition, and method of producing all-solid-state battery

A slurry is prepared by mixing a solid electrolyte material, an electrode active material, and a dispersion medium. The eluted amount of a halogen element in the dispersion medium in the slurry is measured. When the eluted amount is within a reference range, the slurry is rated as a good slurry. An electrode is produced by applying the good slurry to a surface of a base material and drying.

Method of producing electrode, electrode, and all-solid-state battery

Provided is a sulfide all-solid-state battery configured to suppress hydrogen sulfide generation and decrease battery resistance, wherein the sulfide all-solid-state battery comprises a cathode comprising a cathode layer, an anode comprising an anode layer, and a solid electrolyte layer disposed between the cathode layer and the anode layer; wherein the sulfide all-solid-state battery comprises a composite electroconductive material containing a porous electroconductive material and a basic material; wherein the basic material is contained in pores of the porous electroconductive material; and wherein the composite electroconductive material is contained in at least one of the cathode layer and the anode layer.

Sulfide all-solid-state battery

Provided is a sulfide-based solid electrolyte with high lithium ion conductivity. The sulfide-based solid electrolyte may be a sulfide-based solid electrolyte, wherein the sulfide-based solid electrolyte comprises a lithium (Li) element, a phosphorus (P) element, a sulfur (S) element and a halogen element, and it has a LGPS-type crystal structure, and wherein a ratio (P/P) between a proportion (P) of an area of a peak assigned to phosphorus atoms occupying 4d sites in the crystal structure and a proportion (P) of an area of a peak assigned to phosphorus atoms occupying 2b sites in the crystal structure, both of which are peaks observed in aP-MAS-NMR spectrum of the sulfide-based solid electrolyte, is 1.77 or more and 2.14 or less.

Sulfide-based solid electrolyte

A sulfide solid electrolyte material having a high Li ion conductivity is provided. A sulfide solid electrolyte material includes Li, P, I and S, having peaks at 2&#x3b8;=20.2&#xb0; and 23.6&#xb0;, not having peaks at 2&#x3b8;=21.0&#xb0; and 28.0&#xb0; in an X-ray diffraction measurement using a CuK&#x3b1; ray, and having a half width of the peak at 2&#x3b8;=20.2&#xb0; of 0.51&#xb0; or less.

Sulfide solid electrolyte material, sulfide glass, solid state lithium battery, and method for producing sulfide solid electrolyte material

A sulfide solid electrolyte material having high Li ion conductivity can be obtained by providing a method for producing a sulfide solid electrolyte material that has peaks at 2&#x3b8;=20.2&#xb0; and 2&#x3b8;=23.6&#xb0; in an X ray diffraction measurement using a CuK&#x3b1; ray, the method including steps of: an amorphizing step of obtaining sulfide glass by amorphization of a raw material composition that includes at least LiS, PS, LiI and LiBr and a heat treatment step of heating the sulfide glass at a temperature of 195&#xb0; C. or higher.

Method for producing sulfide solid electrolyte material

A main object of the present invention is to provide a solid electrolyte material with high Li ion conductivity and heat stability. To achieve the above object, the present invention provides a solid electrolyte material comprising a composition of LiPSO(1&#x2264;x&#x3c;2 or 2.4&#x3c;x&#x2264;3), a crystal phase A having a peak at a position of 2&#x3b8;=17.80&#xb0;&#xb1;0.50&#xb0;, 25.80&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, and a crystal phase B having a peak at a position of 2&#x3b8;=22.30&#xb0;&#xb1;0.50&#xb0;, 23.14&#xb0;&#xb1;0.50&#xb0;, 24.80&#xb0;&#xb1;0.50&#xb0;, 33.88&#xb0;&#xb1;0.50&#xb0;, 36.48&#xb0;&#xb1;0.50in X-ray diffraction measurement using a CuK&#x3b1; ray.

Solid electrolyte material and all solid lithium battery

A main object of the present invention is to provide a solid electrolyte material with high Li ion conductivity and heat stability. To achieve the above object, the present invention provides a solid electrolyte material comprising a composition of LiPSO(1&#x2264;x&#x2264;3), a crystal phase A having a peak at a position of 2&#x3b8;=17.80&#xb0;&#xb1;0.50&#xb0;, 25.80&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, and a crystal phase B having a peak at a position of 2&#x3b8;=22.30&#xb0;&#xb1;0.50&#xb0;, 23.14&#xb0;&#xb1;0.50&#xb0;, 24.80&#xb0;&#xb1;0.50&#xb0;, 33.88&#xb0;&#xb1;0.50&#xb0;, 36.48&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray.

A sulfide solid electrolyte material having high Li ion conductivity can be obtained by providing a method for producing a sulfide solid electrolyte material that has peaks at 2&#x3b8;=20.2&#xb0; and 2&#x3b8;=23.6&#xb0; in an X ray diffraction measurement using a CuK&#x3b1; ray, the method including steps of: an amorphizing step of obtaining sulfide glass by amorphization of a raw material composition that contains at least LiS, PS, LiI and LiBr and a heat treatment step of heating the sulfide glass at a temperature of 195&#xb0; C. or higher.

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Susono, Japan

Naoki Osada