Negative electrode material for nonaqueous secondary batteries, negative electrode for nonaqueous secondary batteries, and nonaqueous secondary battery

Patent metadata

Field	Value
Publication number	US-12237499-B2
Application number	US-202017091208-A
Country	US
Kind code	B2
Filing date	Nov 6, 2020
Priority date	May 22, 2018
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A negative electrode material for nonaqueous secondary batteries, the negative electrode material comprising carbonaceous particles (A) and silicon oxide particles (B), the carbonaceous particles (A) having a 10%-particle size displacement pressure of 10 MPa or less, the 10%-particle size displacement pressure being measured using a micro-compression testing machine by a specific measuring method, the silicon oxide particles (B) having a median diameter (D50) of 0.8 μm or more and 20 μm or less. It is preferred that the content of the silicon oxide particles (B) is less than 30% by weight of a total content of the carbonaceous particles (A) and the silicon oxide particles (B).

First claim

The invention claimed is:

1. A negative electrode material for nonaqueous secondary batteries, comprising
carbonaceous particles (A) having a 10%-particle size displacement pressure of 2.5 to 10 MPa, the 10%-particle size displacement pressure as measured using a micro-compression testing machine; and
silicon oxide particles (B), having a median diameter (D50) of 0.8 μm or more and 20 μm or less.

2. The negative electrode material for nonaqueous secondary batteries according to claim 1 , the negative electrode material including artificial graphite as the carbonaceous particles (A).

3. The negative electrode material for nonaqueous secondary batteries according to claim 1 , the negative electrode material including granular artificial graphite as the carbonaceous particles (A).

4. The negative electrode material for nonaqueous secondary batteries according to any one of claims 1 to 3 , wherein a content of the silicon oxide particles (B) is less than 30% by weight of a total content of the carbonaceous particles (A) and the silicon oxide particles (B).

5. The negative electrode material for nonaqueous secondary batteries according to any one of claims 1 to 4 , wherein the carbonaceous particles (A) are graphite particles.

6. The negative electrode material for nonaqueous secondary batteries according to any one of claims 1 to 5 , wherein the silicon oxide particles (B) have a structure including a microcrystal of silicon.

7. The negative electrode material for nonaqueous secondary batteries according to any one of claims 1 to 6 , wherein the silicon oxide particles (B) are represented by general formula SiOx where 0.5≤x≤1.6.

8. The negative electrode material for nonaqueous secondary batteries according to any one of claims 1 to 7 , wherein the silicon oxide particles (B) and the carbonaceous particles (A) are present as independent particles.

9. A negative electrode for nonaqueous secondary batteries, the negative electrode comprising a current collector and an active material layer disposed on the current collector, the active material layer including the negative electrode material according to any one of claims 1 to 8 .

10. A nonaqueous secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, the negative electrode being the negative electrode for nonaqueous secondary batteries according to claim 9 .

Assignees

• Mitsubishi Chem Corp

Inventors

• Maru Naoto
• Yamada Shunsuke
• Kondo Hisako

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title