Lithium-ion battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2024194942-A1
Application number	US-202418584413-A
Country	US
Kind code	A1
Filing date	Feb 22, 2024
Priority date	Dec 13, 2021
Publication date	Jun 13, 2024
Grant date	—

Abstract

A lithium ion battery includes a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode active material. The negative electrode includes a negative electrode active material and a specific metal. A void is located inside the negative electrode active material. The specific metal adheres to an outside surface and an inside surface of the negative electrode active material. The specific metal includes a dissolution potential and a deposition potential. The dissolution potential is lower than a potential at which the positive electrode active material releases Li ions. The deposition potential is higher than a potential at which the negative electrode active material stores the Li ions.

First claim

What is claimed is:

1 . A negative electrode for lithium-ion battery, comprising:
a negative electrode active material and a specific metal; a void is located inside the negative electrode active material; the specific metal adheres to an outside surface and an inside surface of the negative electrode active material; the specific metal includes a dissolution potential and a deposition potential; and the deposition potential is higher than a potential at which the negative electrode active material stores lithium ions.

2 . The negative electrode for lithium-ion battery according to claim 1 , wherein the specific metal includes at least one selected from the group consisting of potassium, rubidium, barium, strontium, calcium, sodium, magnesium, aluminum, uranium, titanium, zirconium, manganese, zinc, chromium, iron, cadmium, cobalt, nickel, tin, lead, copper, mercury, and silver.

3 . The negative electrode for lithium-ion battery according to claim 1 , wherein the specific metal includes at least one selected from the group consisting of iron, chromium, and nickel.

4 . The negative electrode for lithium-ion battery according to claim 1 , wherein a ratio of mass of the specific metal to mass of the negative electrode active material is 0.192 to 0.384.

5 . The negative electrode for lithium-ion battery according to claim 1 , wherein the negative electrode active material is a secondary particle including a plurality of primary particles, and the void is located between the primary particles.

6 . The lithium-ion negative electrode for battery according to claim 5 , wherein in the negative electrode active material, the specific metal adheres to the inside surface up to a distance of one-fifth or more of a maximum diameter of the secondary particle from a surface of the secondary particle toward a center of the secondary particle on a line segment of the maximum diameter of the secondary particle.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tateishi Mitsuru
• Hasegawa Hajime

Classifications

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525 Primary

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