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Composite solid electrolyte and all-solid-state battery

Active Publication Date: 2020-02-21
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Conventional solid electrolytes have the problem of insufficient balance between ion conductivity and peel strength when they are press-molded in layers such as solid electrolyte layers

Method used

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  • Composite solid electrolyte and all-solid-state battery
  • Composite solid electrolyte and all-solid-state battery
  • Composite solid electrolyte and all-solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] [Production of composite solid electrolyte]

[0164] All experimental operations were carried out in a glove box controlled by Ar gas with a dew point below -70°C.

[0165] As the first sulfide-based solid electrolyte particles, Li 6 P.S. 5 Cl crystal particles.

[0166] The first sulfide-based solid electrolyte particles had an average particle diameter (D50) of 0.5 μm, a Young's modulus of 80 GPa, an aspect ratio of 2, a major axis length of the particles of 1 μm, and a lithium ion conductivity of 1 mS / cm.

[0167] As the second sulfide-based solid electrolyte particles, LiI-LiBr-Li was prepared 3 P.S. 4 Glass ceramic particles.

[0168] The second sulfide-based solid electrolyte particles had an average particle diameter (D50) of 3 μm, a Young's modulus of 15 GPa, an aspect ratio of 1, a major axis length of the particles of 3 μm, and a lithium ion conductivity of 3.2 mS / cm.

[0169] Put the first sulfide-based solid electrolyte particles and the second sulfide...

Embodiment 2

[0171] Put the first sulfide-based solid electrolyte particles and the second sulfide-based solid electrolyte particles into the mortar so that the first sulfide-based solid electrolyte particles: the second sulfide-based solid electrolyte particles = 1:99 (mass % ) except for the mixing ratio, a composite solid electrolyte was produced in the same manner as in Example 1.

Embodiment 3

[0173] Put the first sulfide-based solid electrolyte particles and the second sulfide-based solid electrolyte particles into the mortar so that the first sulfide-based solid electrolyte particles: the second sulfide-based solid electrolyte particles = 5: 95 (mass % ) except for the mixing ratio, a composite solid electrolyte was produced in the same manner as in Example 1.

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Abstract

The invention relates to a composite solid electrolyte and an all-solid-state battery. An all-solid-state battery is provided with a positive electrode including a positive electrode layer, a negativeelectrode including a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer. The all-solid-state battery comprises a composite solid electrolyte containing first sulfide-based solid electrolyte particles and second sulfide-based solid electrolyte particles having a smaller Young's modulus than the first sulfide-basedsolid electrolyte particles; wherein an average particle diameter of the first sulfide-based solid electrolyte particles is smaller than the second sulfide-based solid electrolyte particles. The composite solid electrolyte is included in at least one layer selected from the group consisting of the positive electrode layer, the negative electrode layer, and the solid electrolyte layer.

Description

technical field [0001] The present disclosure relates to composite solid electrolytes and all-solid batteries. Background technique [0002] With the rapid spread of information-related equipment such as personal computers, video cameras, and mobile phones, and communication equipment, etc., the development of batteries used as their power sources has attracted attention in recent years. In addition, in the automobile industry and the like, development of high-output and high-capacity batteries for electric vehicles or hybrid vehicles is also being developed. [0003] Among the all-solid-state batteries, the all-solid-state lithium-ion battery has high energy density due to the use of the battery reaction accompanied by the movement of lithium ions. In addition, a solid electrolyte is used as the electrolyte sandwiched between the positive electrode and the negative electrode instead of containing an organic solvent. This point of the electrolyte has attracted attention. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0068H01M10/052H01M2300/0091Y02E60/10Y02P70/50H01M10/0585
Inventor 长田尚己
Owner TOYOTA JIDOSHA KK