Toyota Jidosha Kabushiki Kaisha

Tokyo Institute of Technology

Yuki Kato

Takamasa Ohtomo

Koji Kawamoto

Shigenori Hama

Takamasa Otomo

Ryoji Kanno

Hisatsugu Yamasaki

Masatsugu Kawakami

Masaaki Hirayama

Yasushi Tsuchida

Mayuko Osaki

Satoshi Hori

Mitsuru Sakano

Kota Suzuki

Kunihiro Nobuhara

To suppress heat generation in a stacked battery including a plurality of electric elements in internal short circuits and an unstable reaction when the battery is operated while an energy level is increased, the stacked battery includes a stack comprising a first current collector layer, a second current collector layer, a plurality of bipolar current collector layers that are arranged between the first and second current collector layers at intervals in the stacking direction, a plurality of electric elements, an anode active material layer, and an electrolyte layer that is arranged between the cathode and anode active material layers, where the ratio h/S (cm) of a length h (cm) between the one end face and the other end face in the stacking direction of the stack to an electrode area S (cm) on a cross section orthogonal to the stacking direction of the stack is more than 1.

Stacked battery

Provided is an all solid state battery having improved charge-discharge capacity. The all solid state battery has a structure in which a current collector layer, an electrode body layer and a solid electrolyte layer are laminated in that order, wherein the electrode body layer has an active material layer and a conductive member, the active material layer contacts the solid electrolyte layer, the conductive member contacts the current collector layer and has a protruding portion, and the protruding portion protrudes towards the solid electrolyte layer from at least a portion of the surface of the current collector layer on the electrode body layer side, and contacts the surface of the active material layer in the direction of thickness thereof.

All solid state battery

The problem of the present invention is to provide a sulfide solid electrolyte material with favorable reduction resistance. The present invention solves the problem by providing a sulfide solid electrolyte material having a peak at a position of 2&#x3b8;=30.26&#xb0;&#xb1;1.00&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, and having a composition of LiSiPSO(a=1&#x2212;x+y, 0.65&#x2264;x&#x2264;0.75, &#x2212;0.025&#x2264;y&#x2264;0.1, &#x2212;0.2&#x2264;z&#x2264;0).

Sulfide solid electrolyte material, battery, and producing method for sulfide solid electrolyte material

A method of producing a sulfide solid electrolyte material includes: forming an intermediate having crosslinking sulfur but no LiS, by vitrifying, in a first vitrification process, a starting material composition obtained by mixing LiS and a sulfide of a group 14 or group 15 element such that a proportion of LiS with respect to the sum total of the LiS and the sulfide of a group 14 or group 15 element is smaller than a proportion of LiS required for the sulfide solid electrolyte material to obtain an ortho composition; and eliminating the crosslinking sulfur by vitrifying, in a second vitrification process, an intermediate-containing composition resulting from mixing a bond cleaving compound, which cleaves a bond of the crosslinking sulfur, with the intermediate.

Method of producing a sulfide solid electrolyte material, sulfide solid electrolyte material, and lithium battery

A sulfide solid electrolyte material has favorable ion conductivity and resistance to reduction. The sulfide solid electrolyte material includes a peak at a position of 2&#x3b8;=29.86&#xb0;&#xb1;1.00&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, and a composition of LiPS(0.1&#x2264;y&#x2264;0.175).

The main object of the present invention is to provide a sulfide solid electrolyte material having favorable ion conductivity and high stability against moisture. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material comprising an Melement (such as Li element), an Melement (such as Ge element, Sn element and P element) and a S element, and having a peak at a position of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, characterized in that when a diffraction intensity at the above-mentioned peak of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; is regarded as IA and a diffraction intensity at a peak of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0; is regarded as IB, a value of IB/IA is less than 0.50, and the Mcontains at least P and Sn.

The present invention aims to provide a sulfide solid electrolyte material with favorable ion conductivity, in which charge and discharge efficiency may be inhibited from decreasing. The object is attained by providing a sulfide solid electrolyte material, including: a Li element; a P element; and a S element, characterized in that the material has a peak at a position of 2&#x3b8;=30.21&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, and the sulfide solid electrolyte material does not substantially include a metallic element belonging to the third group to the sixteenth group.

An object of the present invention is to provide a sulfide solid electrolyte material with favorable ion conductivity. In the present invention, the above object is achieved by providing a sulfide solid electrolyte material comprising a composition of LiSiPSX(0.37&#x2264;x&#x2264;0.40, 0.054&#x2264;y&#x2264;0.078, 0.05&#x2264;z&#x2264;0.07, 0&#x2264;w&#x2264;0.05, and X is at least one of F, Cl, Br, and I), characterized in that the sulfide solid electrolyte material has a crystal phase A having a peak at a position of 2&#x3b8;=29.58&#xb0;&#xb1;1.00&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, the sulfide solid electrolyte material does not have a crystal phase B having a peak at a position of 2&#x3b8;=30.12&#xb0;&#xb1;1.00&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray, or slightly has the crystal phase B.

Sulfide solid electrolyte material, battery, and method for producing sulfide solid electrolyte material

An object of the present invention is to provide a sulfide solid electrolyte material having satisfactory ion conductivity. In the present invention, the above object is solved by providing a sulfide solid electrolyte material comprising a Li element, a Si element, a P element, a S element, and an X element (in which X represents at least one of F, Cl, Br and I), the sulfide solid electrolyte material having a crystal phase B having a peak at the position of 2&#x3b8;=30.12&#xb0;&#xb1;1.00&#xb0; measured by X-ray diffractometry using CuK&#x3b1; ray.

An all-solid-state battery that makes it possible to improve the cycling properties is provided. The all-solid-state battery includes an anode; a cathode; a solid electrolyte layer that is arranged between the anode and the cathode; an anode collector that is connected to the anode; and a cathode collector that is connected to the cathode. In the all-solid-state battery, a metal layer is arranged between the anode and the anode collector and/or between the cathode and the cathode collector, and metal that does not undergo an electrochemical reaction with metal ions under a potential environment where an active material stores and releases the metal ions, and whose percent elongation is no less than 22% is used for the metal layer.

All-solid-state battery

The main object of the present invention is to provide a sulfide solid electrolyte material with high Li ion conductivity. The present invention solves the problem by providing a sulfide solid electrolyte material comprising an ion conductor with an ortho-composition, and LiI, characterized in that the sulfide solid electrolyte material is glass with a glass transition point.

Sulfide solid electrolyte material and lithium solid state battery

Sulfide solid electrolyte material with favorable ion conductivity, wherein charge and discharge efficiency is inhibited from decreasing. Solves problem by providing a sulfide solid electrolyte material including a Li element, Si element, P element, S element and O element, having peak at position of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using CuK&#x3b1; ray, wherein sulfide solid electrolyte material does not have peak at position of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using CuK&#x3b1; ray, or in case of having peak at position of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0;, value of I/Iis 1 or less when diffraction intensity at peak of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; is regarded as Iand diffraction intensity at peak of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0; is regarded as I; and wherein molar fraction of O element to total of S element and O element is larger than 0.2.

A main object of the present invention is to provide a sulfide solid electrolyte material having favorable ion conductivity and low reduction potential. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material including an Melement (such as a Li element), an Melement (such as a Ge element, a Si element and a P element) and a S element, wherein the material has a peak at a position of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; line; and when a diffraction intensity at the peak of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; is regarded as Iand a diffraction intensity at a peak of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0; is regarded as I, a value of I/Iis less than 0.50, and Mcontains at least P and Si.

A main object of the present invention is to provide a method for producing a cathode active material for a solid state battery, which is capable of reducing resistance. The present invention solves the problem by providing a method for producing a cathode active material for a solid state battery comprising steps of: a coating step of coating a coating material represented by LiPO(2&#x2264;x&#x2264;4, 3&#x2264;y&#x2264;5) on a surface of a cathode active material containing an Ni element and being an oxide by using a sputtering method; and a heat-treating step of forming a coating portion in such a manner that the cathode active material coated with the coating material is heat-treated within a range of 400&#xb0; C. to 650&#xb0; C. to diffuse the Ni element into the coating material.

Growing community of inventors

Susono, Japan

Yuki Kato