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Method for producing metal particle composition, and metal particle composition

A technology of metal particles and manufacturing methods, applied in metal processing equipment, grain processing, electrical components, etc., can solve problems such as volume expansion, deterioration of charge and discharge characteristics, and high resistance

Inactive Publication Date: 2021-05-18
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, metal materials such as silicon and germanium have a large volume expansion with the absorption of lithium ions.
Therefore, a large stress occurs in the negative electrode active material layer during charging, and cracks and peeling occur in the negative electrode active material layer, resulting in high resistance and degraded charge and discharge characteristics.

Method used

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  • Method for producing metal particle composition, and metal particle composition
  • Method for producing metal particle composition, and metal particle composition
  • Method for producing metal particle composition, and metal particle composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0205] A bead mill (manufactured by AIMEX Corporation, readymill RMB-08) is used as the intermittent medium agitation type pulverizer. The pulverization container (outer cylinder material: SUS304, inner cylinder material: zirconia, etc., effective volume: 125 mL), put 6.0 g of germanium metal (manufactured by High Purity Chemical Co., Ltd., 45 μm pass, true density 5.3 g / mL, Mohs hardness 6.0, D 90 -D 10 =21.52,D PT =15.89), 108g zirconia beads as beads ( True density 5.7g / mL), isopropanol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., true density 0.79g / mL) as the quality 24.0g of dispersion solvent, the zirconia shaft is set, and the rotation stirring beads by the shaft, Metal material 1 is subjected to wet pulverization. When performing wet pulverization, use a cooler set at 10°C to allow water to flow between the outer cylinder and the inner cylinder of the pulverization container, and set the temperature of the pulverization container so that it is suff...

Embodiment 2

[0210] Except that the ratio of the mass of the metal material 1 to the mass of the beads was 0.083, wet pulverization was performed under the same conditions as in Example 1, and the dispersion liquid A2 was collected. When measuring the particle size distribution of dispersion A2, the particle size width D 90 -D 10 1.10μm, peak D PT is 0.89 μm.

Embodiment 3

[0212] The wet pulverization was carried out under the same conditions as in Example 1 except that the peripheral speed was set at 5 m / s, and the dispersion liquid A3 was recovered. The particle size distribution of the dispersion A3 was measured, the particle size width D 90 -D 10 1.50μm, peak D PT is 0.89 μm.

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Abstract

The present invention addresses the problem of providing a method for producing a metal particle composition, which makes it possible to produce metal material particles having a narrow particle size distribution in a metal material having lower hardness than silicon. The solution for the problem is a method for producing a metal particle composition comprising metal material particles, a component derived from a grinding container and a component derived from beads, the method comprising the step of stirring and grinding a metal material containing a metal having Mohs hardness of 2.5 to 6.3 in a grinding container in the presence of beads that serve as a grinding medium using a medium-agitation-type grinder equipped with a rotating body, the ratio of the mass of the metal material to the mass of the beads is 0.02 to 0.10 and the peripheral speed of the rotating body is 2.5 to 8.5 m / s.

Description

technical field [0001] The present invention relates to a method for producing a metal particle composition that can be used as a negative electrode material for a lithium ion secondary battery and the metal particle composition. Background technique [0002] Since silicon, germanium and tin, which are group 14 elements, have higher lithium ion storage capacity than carbon materials, they can be used as negative electrode materials for lithium ion secondary batteries. For example, when germanium is used as a negative electrode active material of a lithium ion secondary battery, it provides a discharge capacity more than four times that of a carbon-based negative electrode active material (Patent Document 1). [0003] However, metal materials such as silicon and germanium expand greatly in volume as lithium ions are absorbed. Therefore, a large stress is generated in the negative electrode active material layer during charging, and cracks and peeling occur in the negative el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B02C17/16B02C17/20B22F1/05
CPCB02C17/16B02C17/20B22F2009/043B22F1/05H01M4/38Y02E60/10B22F9/04C22C16/00B22F2009/041B22F2009/046B22F2304/10
Inventor 松永拓也岛野哲
Owner SUMITOMO CHEM CO LTD
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