METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE PARTICLES

• US 20190319302A1
• Filed: 03/20/2019
• Published: 10/17/2019
• Est. Priority Date: 04/13/2018
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: KINTSU, Yusuke
• Granted Patent: US 11,108,081 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A method for efficiently producing sulfide solid electrolyte particles which are particles in spherical form and which have a small particle diameter. The method comprises: preparing a sulfide solid electrolyte material, grinding the sulfide solid electrolyte material by mechanical milling to obtain particles in flattened form (a first grinding step), and grinding the particles in flattened form by mechanical milling to obtain sulfide solid electrolyte particles in spherical form (a second grinding step), wherein a relationship A (J)>B (J) is satisfied, where A (J) is a kinetic energy (1/2(mv²)) per grinding medium used in the first grinding step, and B (J) is a kinetic energy (1/2(mv²)) per grinding medium used in the second grinding step.

Claims

1. A method for producing sulfide solid electrolyte particles, the method comprising:

preparing a sulfide solid electrolyte material,

grinding the sulfide solid electrolyte material by mechanical milling to obtain particles in flattened form (a first grinding step), and

grinding the particles in flattened form by mechanical milling to obtain sulfide solid electrolyte particles in spherical form (a second grinding step),

wherein a relationship A (J)>

B (J) is satisfied, where A (J) is a kinetic energy (1/2(mv²)) per grinding medium used in the first grinding step, and B (J) is a kinetic energy (1/2(mv²)) per grinding medium used in the second grinding step.

2. The method for producing the sulfide solid electrolyte particles according to claim 1, wherein a median diameter (D₅₀) of the particles in flattened form obtained in the first grinding step is 2.0 μ

m or less, and a median diameter (D₅₀) of the sulfide solid electrolyte particles obtained in the second grinding step is 1.0 μ

m or less.

3. The method for producing the sulfide solid electrolyte particles according to claim 1, wherein the kinetic energy A per grinding medium used in the first grinding step is in a range of from 3.0×

10<sup>−

7</sup> (J) to 1.0×

10<sup>−

5</sup> (J), and the kinetic energy B per grinding medium used in the second grinding step is in a range of from 1.0×

10<sup>−

8</sup> (J) to 1.6×

10<sup>−

7</sup> (J).

4. The method for producing the sulfide solid electrolyte particles according to claim 1, wherein the kinetic energy A per grinding medium used in the first grinding step is in a range of from 3.0×

10<sup>−

7</sup> (J) to 1.0×

10<sup>−

5</sup> (J);

the kinetic energy B per grinding medium used in the second grinding step is in a range of from 1.0×

10<sup>−

8</sup> (J) to 3.5×

10<sup>−

7</sup> (J); and

a grinding temperature used in the second grinding step is 40°

C. or more.