Carbon material, anode material and spacer additive for lithium ion battery

Patent metadata

Field	Value
Publication number	US-10608276-B2
Application number	US-201415506817-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Aug 29, 2014
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

The present invention provides a novel carbon material comprising a three-dimensional graphene network constituting a plurality of cells interconnecting as a whole, where at least one of the cells has single-layer graphene wall. The carbon material is suitable for a lithium ion battery.

First claim

The invention claimed is:

1. An anode material for a lithium-ion battery comprising a carbon material comprising a three-dimensional graphene network constituting a plurality of cells interconnecting as a whole, where at least one of the cells has a single-layer graphene wall and the plurality of cells is formed by expansion of an expandable graphite, and active particles including at least one element that is able to store lithium ions; wherein the carbon material is formed by a first heat treatment in an inert atmosphere at 200-500° C. with 1° C./min to 10° C./min for more than one hour and, subsequently, a second heat treatment in an inert atmosphere at a temperature higher than 800° C.

2. The anode material according to claim 1 , wherein the active particles are embedded in the cells and confined with amorphous carbon that covers the carbon material.

3. The anode material according to claim 2 , wherein a size of the anode material is 100 μm or less.

4. The anode material according to claim 2 , wherein a size of the cell in the carbon material is equal to or less than 15 μm and larger than a size of active particles.

5. The anode material according to claim 2 , wherein a size of the active particles is 1 μm or less.

6. The anode material according to claim 2 , wherein the active particles comprise at least one of silicon, tin, iron and zinc and oxides thereof.

7. The anode material according to claim 2 , wherein the amorphous carbon comprises at least one element selected from boron, nitrogen and fluorine.

8. A negative electrode for a lithium-ion battery comprising the anode material according to claim 1 .

9. A lithium ion battery comprising the negative electrode according to claim 8 .

10. A negative electrode for a lithium-ion battery comprising the anode material according to claim 2 .

11. A negative electrode for a lithium-ion battery comprising the anode material according to claim 3 .

12. A negative electrode for a lithium-ion battery comprising the anode material according to claim 4 .

13. A negative electrode for a lithium-ion battery comprising the anode material according to claim 5 .

14. A negative electrode for a lithium-ion battery comprising the anode material according to claim 6 .

15. A negative electrode for a lithium-ion battery comprising the anode material according to claim 7 .

Assignees

• Nec Corp

Inventors

• Cheng Qian
• Tamura Noriyuki
• Nakahara Kentaro

Classifications

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title