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Sulfide solid electrolyte particles and all-solid-state battery

A solid electrolyte, solid electrolyte layer technology, applied in solid electrolyte, non-aqueous electrolyte storage battery, non-aqueous electrolyte and other directions, can solve the problem of easy deterioration of sulfide solid electrolyte materials

Pending Publication Date: 2020-07-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the battery using the above-mentioned sulfide solid electrolyte material, there is a problem that a high-resistance site is generated at the interface between the sulfide solid electrolyte material and the oxide active material when it is in contact with the oxide active material, and the sulfide solid electrolyte material The material is easy to deteriorate

Method used

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  • Sulfide solid electrolyte particles and all-solid-state battery
  • Sulfide solid electrolyte particles and all-solid-state battery
  • Sulfide solid electrolyte particles and all-solid-state battery

Examples

Experimental program
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Effect test

Embodiment 1

[0171] (1) Production of sulfide solid electrolyte particles

[0172] Will Li 2 S (Furuuchi Chemical Co., Ltd.) 0.5503 g, P 2 S 5 (Aldrich Corporation) 0.8874g, LiI (Koshin Chemical Laboratory Co., Ltd.) 0.2850g and LiBr (Koshin Chemical Laboratory Co., Ltd.) 0.2773g were put into a zirconia tank (45mL) containing 5mm diameter zirconia balls , and then put in 4 g of dehydrated heptane (Kanto Chemical Co., Ltd.), and close the lid. This was placed in a planetary ball mill (manufactured by Fritsch, P-7) and mechanically ground for 20 hours to obtain a sulfide solid electrolyte glass.

[0173] Put 2 g of the sulfide solid electrolyte glass into a zirconia tank equipped with 0.3 mm diameter zirconia balls again, put 2 g of dibutyl ether (Kishida Chemical Co., Ltd.) and 6 g of dehydrated heptane, and stir for 20 hours to prepare small particle size glass.

[0174] The obtained small-particle-diameter glass was fired by heating at a temperature (200° C.) higher than the crystal...

Embodiment 2

[0187] In the production of the sulfide solid electrolyte particles in Example 1, the firing atmosphere of the small particle size glass was set to 99.5% by volume Ar, 0.5% by volume O 2 The sulfide solid electrolyte particles 2 of Example 2 were produced in the same manner as in Example 1 except for this.

[0188] In the manufacture of the all-solid lithium ion secondary battery of Example 1, the sulfide solid electrolyte particle 2 of Example 2 was used instead of the sulfide solid electrolyte particle 1 of Example 1, and it was produced in the same manner as in Example 1. An all-solid lithium-ion secondary battery.

Embodiment 3

[0190] In the production of the sulfide solid electrolyte particles of Example 1, the firing atmosphere of the small particle size glass was set to 99% by volume Ar, 1% by volume O 2 The sulfide solid electrolyte particles 3 of Example 3 were produced in the same manner as in Example 1 except for this.

[0191] In the manufacture of the all-solid lithium ion secondary battery of Example 1, the sulfide solid electrolyte particle 3 of Example 3 was used instead of the sulfide solid electrolyte particle 1 of Example 1, and it was produced in the same manner as in Example 1. An all-solid lithium-ion secondary battery.

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Abstract

Provided are sulfide solid electrolyte particles, which have sufficient ion conductivity and are configured to suppress a resistance increase rate after charge-discharge cycles when used in an all-solid-state battery, and an all-solid-state battery comprising the sulfide solid electrolyte particles. The sulfide solid electrolyte particles may be sulfide solid electrolyte particles comprising a sulfide solid electrolyte that comprises Li, P, S and a halogen as constituent elements, wherein an oxygen / sulfur element ratio of a particle surface measured by XPS, is 0.79 or more and 1.25 or less, and an oxygen / sulfur element ratio at a depth of 30 nm (in terms of a SiO2 sputter rate) from the particle surface measured by XPS, is 0.58 or less.

Description

technical field [0001] The present disclosure relates to sulfide solid electrolyte particles and all solid batteries. Background technique [0002] All-solid batteries such as all-solid lithium secondary batteries obtained by replacing liquid electrolytes with solid electrolytes do not use flammable organic solvents in the batteries, thereby simplifying safety devices and being excellent in manufacturing cost and productivity. [0003] Since the positive electrode, the negative electrode, and the electrolyte are all solid in such an all-solid-state battery battery pack, the resistance tends to be higher and the output current lower than, for example, a lithium secondary battery using an organic electrolyte solution. [0004] Therefore, in order to increase the output current of the all-solid lithium secondary battery, an electrolyte with high ion conductivity is preferable as the electrolyte. It is considered that in the sulfide solid electrolyte, sulfide ions exhibit highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/052
CPCH01M10/0562H01M10/052H01M2300/0068Y02E60/10H01M10/0525H01M4/386H01M4/525C03C3/321H01M4/5815
Inventor 南圭一
Owner TOYOTA JIDOSHA KK
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