Electrochemically modified carbon material for lithium-ion battery

Patent metadata

Field	Value
Publication number	US-10601043-B2
Application number	US-201415506813-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Aug 29, 2014
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

The present invention provides an anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle.

First claim

The invention claimed is:

1. An anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle, wherein a density of the defective portions is 2 to 3 portions per μm 2 .

2. An anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle;
wherein the size of holes or pores is distributed between 500 nm and 1 μm and the carbon particle includes a layer of graphenes having an interlayer space larger than 0.335 nm; and
wherein a density of the defective portions is 2 to 3 portions per μm 2 .

3. The anode material according to claim 2 , wherein the carbon particle has been subjected to heat treatment after the anodic oxidation.

4. The anode material according to claim 2 , further comprising anode active particles which are capable of absorbing and desorbing lithium ions.

5. The anode material according to claim 4 , wherein the anode active particles are metal or semi-metal particles or compound particles of at least one element selected from a group consisting of Si, Sn, Al, Ge and Pb.

6. An anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm and anode active particles which are capable of absorbing and desorbing lithium ions, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle,
wherein the size of holes or pores is distributed between 500 nm and 1 μm and the carbon particle includes a layer of graphenes having an interlayer space larger than 0.335 nm,
wherein the anode active particles adhere on the carbon particle, and
wherein the carbon particle and the anode active particles are cornposited with amorphous carbon layer.

7. A lithium ion battery comprising the anode material according to claim 1 .

8. A lithium ion battery comprising the anode material according to claim 2 .

9. A lithium ion battery comprising the anode material according to claim 3 .

10. A lithium ion battery comprising the anode material according to claim 4 .

11. A lithium ion battery comprising the anode material according to claim 5 .

Assignees

• Nec Corp

Inventors

• Cheng Qian
• Tamura Noriyuki
• Nakahara Kentaro

Classifications

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title