Tokyo Institute of Technology

Toyota Jidosha Kabushiki Kaisha

Sumitomo Chemical Company, Limited

Tokyo Shibaura Denki Kabushiki Kaisha

Doryokuro Kakunenryo Kaihatsu Jigyodan

Masaaki Hirayama

Ryoji Kanno

Yuki Kato

Takamasa Otomo

Kota Suzuki

Koji Kawamoto

Satoshi Hori

Hisatsugu Yamasaki

Shigenori Hama

Takayuki Kaneko

Takamasa Ohtomo

Yuichiro Imanari

Kenji Nakane

Mitsuru Sakano

Kunihiro Nobuhara

Hirobumi Oshima

Kenichi Matsumaru

Yulong Sun

Huang Wenze

Provided is a sulfide solid electrolyte material which has a composition that does not contain Ge, while having a smaller Li content than conventional sulfide solid electrolyte materials, and which has both lithium ion conductivity and chemical stability at the same time. A sulfide solid electrolyte which has a crystal structure represented by composition formula (LiSn)(SiSn)(PSi)S(wherein &#x3b1;&#x2264;0.67, &#x3b2;&#x2264;0.33 and 0.43&#x3c;&#x3b1;+&#x3b2; (provided that 0.23&#x3c;&#x3b1;&#x2264;0.4 when &#x3b2;=0.2 and 0.13&#x3c;&#x3b1;&#x2264;0.4 when &#x3b2;=0.3 may be excluded)), or a crystal structure represented by composition formula LiSiPS(wherein 0.1&#x2264;&#x3b3;&#x3c;0.3).

Sulfide solid electrolyte

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).

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

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.

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 disclosure is to provide a sulfide solid electrolyte material with favorable Li ion conductivity. To achieve the above object, the present disclosure provides a sulfide solid electrolyte material comprising a composition of LiAlSiS(0&#x3c;x&#x3c;1), and having a peak at a position of 2&#x3b8;=25.19&#xb0;&#xb1;1.00&#xb0;, 29.62&#xb0;&#xb1;1.00&#xb0;, 30.97&#xb0;&#xb1;1.00&#xb0; in X-ray diffraction measurement using a CuK&#x3b1; ray.

The problem is to provide a sulfide solid electrolyte material with favorable Li ion conductivity in a low-temperature environment. The problem is overcome by providing a sulfide solid electrolyte material comprising an Melement (such as an Li element and an Mg element), an Melement (such as a Ge element and a P element) and a S element, wherein the sulfide solid electrolyte 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; ray, does not have a peak at a position of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0; or slightly having the peak, and a substituted amount &#x3b4;(%) of the divalent element in the Melement is in such a range that the sulfide solid electrolyte material exhibits higher Li ion conductance at 0&#xb0; C. than the case of &#x3b4;=0.

The object of the present invention is to provide a sulfide solid electrolyte material with favorable ion conductivity. The present invention attains the object by providing a sulfide solid electrolyte material including an Melement (such as a Li element), an Melement (such as a Ge element and a P element), a S element and an O element, and having a peak at a position of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; in an X-ray diffraction measurement using a CuK&#x3b1; ray, characterized in that 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.

The problem of the present invention is to provide a sulfide solid electrolyte material having excellent ion conductivity. The present invention solves the problem by providing a sulfide solid electrolyte material comprising an Melement (such as a Li element), an Melement (such as a Ge element and a P element), and an S element; having a peak in a position of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; in an X-ray diffraction measurement using a CuK&#x3b1; line; and having an I/Ivalue of less than 0.50 when a diffraction intensity at the peak of 2&#x3b8;=29.58&#xb0;&#xb1;0.50&#xb0; is represented by Iand a diffraction intensity at a peak of 2&#x3b8;=27.33&#xb0;&#xb1;0.50&#xb0; is represented by I.

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

The object of the present invention is to provide a method for producing simply a positive electrode active material which can further increase charge-discharge capacity of secondary batteries when the positive electrode active material is used for positive electrode of secondary batteries, particularly non-aqueous electrolyte secondary batteries. A method for producing a positive electrode active material includes the step of heat-treating a lithium mixed metal oxide represented by the formula LiMOin the presence of a hydride wherein M is at least one element selected from the group consisting of Ti, V, Mn, Fe, Co and Ni.

Method for producing positive electrode active material and positive electrode active material

A system for denitrating a starting nitric acid solution by irradiation of microwaves to obtain oxide product of the solution comprises a receiver for receiving the solution, a rectangular oven vessel provided with a bottom plate on which the receiver is put, and a conveying mechanism located below the bottom plate for continuously conveying the receiver on the bottom plate throughout the oven vessel. A microwave generator is operatively connected to the oven vessel for generating microwaves to irradiate the content of the receiver when it passes throughout the oven vessel. The receiver may be rotated and vertically moved when it is subjected to denitration and calcination in the oven vessel.

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Yokohama, Japan

Masaaki Hirayama