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Solid electrolyte, and electrode mixture, solid electrolyte layer, and solid-state battery using same

A solid electrolyte, solid state battery technology, applied in the field of electrode mixture, can solve problems such as hydrogen sulfide generation

Pending Publication Date: 2022-05-27
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, this document also records the problem that the sulfide solid electrolyte may react with moisture in the atmosphere to generate hydrogen sulfide

Method used

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  • Solid electrolyte, and electrode mixture, solid electrolyte layer, and solid-state battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] to form Li 5.4 PS 4.4 Cl 0.8 Br 0.8 way of weighing Li 2 S powder, P 2 S 5 Powder, LiCl powder and LiBr powder. These powders were pulverized and mixed using a ball mill to obtain mixed powders. The mixed powder is calcined to obtain a calcined product containing a lithium ion conductive sulfide. Firing was performed using a tubular electric furnace. During the calcination, hydrogen sulfide gas having a purity of 100% was circulated into the electric furnace at 1.0 L / min. The calcination temperature was set to 490°C, and the calcination took 4 hours. As a result of the XRD measurement, it was confirmed that the calcined product had a crystal phase of the arginite-type crystal structure and LiCl 0.5 Br 0.5 crystalline phase.

[0060] After the roasted product was roughly crushed with a mortar and pestle, it was crushed with a hammer crusher, and the crushed product was mixed with a solvent to prepare a slurry with a concentration of 10% by mass. This slurry ...

Embodiment 2

[0062] The calcination temperature, pulverizing apparatus, slurry concentration, and medium diameter in Example 1 were changed to the values ​​shown in Table 1 below. Other than that, it carried out similarly to Example 1, and obtained the solid electrolyte.

Embodiment 3

[0064] The pulverizing apparatus, slurry concentration, and medium diameter in Example 1 were changed to the values ​​shown in Table 1 below. Other than that, it carried out similarly to Example 1, and obtained the solid electrolyte.

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Abstract

The solid electrolyte according to the present invention contains a compound A that contains a crystal phase having an argyrodite-type crystal structure and that is represented by LiaPSbXc (X is at least one halogen element), and a compound B that contains a crystal phase having an argyrodite-type crystal structure. And a represents a number of 3.0 or more and 6.0 or less. And b represents a number of 3.5 or more and 4.8 or less. And c represents a number of 0.1 or more and 3.0 or less). The compound B is represented by LiX (in the formula, X is defined as above). The crystallite size of the compound B is 25 nm or more. The solid electrolyte is suitable when the BET specific surface area is 14.0 m2 / g or less.

Description

technical field [0001] The present invention relates to a solid electrolyte and an electrode mixture using the same, a solid electrolyte layer, and a solid state battery. Background technique [0002] In recent years, solid electrolytes have attracted attention as a substitute for electrolyte solutions used in various liquid-based batteries. A solid-state battery using such a solid electrolyte is expected to be put into practical use as a battery having higher safety and higher energy density than a liquid-based battery using a combustible organic solvent. [0003] As a prior art related to a solid electrolyte, for example, the technology described in Patent Document 1 is known. In this document, there is a description of one of the solid electrolytes used in lithium ion batteries, that is, a sulfide solid electrolyte. As the crystal structure of the sulfide solid electrolyte, various structures are known, and one of them is the arginite-type crystal structure. This docum...

Claims

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Application Information

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IPC IPC(8): H01B1/06H01B1/10H01M4/13H01M4/62H01M6/18H01M10/052H01M10/0562
CPCH01B1/10H01M4/13H01M6/18H01M4/62H01B1/06H01M10/052H01M10/0562C01P2006/12C01P2006/40C01P2002/85C01B17/22H01M10/0525H01M2300/0068H01M2300/008C01B25/14C01P2004/64Y02E60/10
Inventor 星裕二松岛英明
Owner MITSUI MINING & SMELTING CO LTD
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