# US 7,465,519 B2 · Lithium-ion battery incorporating carbon nanostructure materials

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- Number: US 7,465,519 B2
- Document ID: US7465519B2
- Status: Granted
- Kind: B2
- Application number: 10/933,751
- Filed: 2004-09-03
- Published: 2006-03-09
- Granted: 2008-12-16
- Earliest claimed: 2004-09-03
- Assignees: The HongKong University of Science and Technology
- Inventors: Zikang Tang; Ping Sheng; Qi Liang; Ning Wang; Che Ting Chan
- Web page: https://patentgrep.com/patent/US7465519B2

## CPC

- H01M 4/587: for inserting or intercalating light metals
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- Y02E 60/10: Energy storage using batteries
- Y10S 977/742: Carbon nanotubes, CNTs
- Y10S 977/75: Single-walled
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A lithium ion battery is disclosed in which the negative electrode material comprises carbon nanostructures having no dimension greater than 2 μm. The battery has a high reversible capacity of the order of 400 mAh/g to 500 mAh/g which can be maintained over a long cycle-life (at least 30 cycles). The carbon nanostructures may be mixed with graphite to improve conductivity. The carbon nanostructues may be synthesized using an AFI template material followed by calcination.

## Claims

### Claim 1

A lithium ion battery wherein the negative electrode material comprises carbon nanotubes having no dimension greater than 2 μm, and wherein the negative electrode material comprises a mixture of said carbon nanotubes and graphite.

### Claim 2 (depends on 1)

A battery as claimed in claim 1 wherein said carbon nanostructures comprise from 10 wt % to 90 wt % of said mixture.

### Claim 3 (depends on 2)

A battery as claimed in claim 2 wherein said carbon nanostructures comprise 50 wt % of said mixture.

### Claim 4 (depends on 1)

A battery as claimed in claim 1 wherein said negative electrode material comprises said carbon nanostructures and a binder.

### Claim 5 (depends on 1)

A battery as claimed in claim 1 wherein the carbon nanostructures comprises a mixture of approximately 90% amorphous nanocarbon and 10% single-walled carbon nanotubes.

### Claim 6

A lithium ion battery wherein a negative electrode material comprises carbon nanotubes having no dimension greater than 2 μm, and wherein said lithium ion battery comprises a reversible capacity in a range of 400 to 500 mAh/g, and wherein the negative electrode material comprises a mixture of said carbon nanotubes and graphite.

### Claim 7 (depends on 6)

A battery as claimed in claim 6 wherein said carbon nanostructures comprise 50 wt % of said mixture.

### Claim 8 (depends on 6)

A battery as claimed in claim 6 wherein said negative electrode material comprises said carbon nanostructures and a binder.

### Claim 9 (depends on 6)

A battery as claimed in claim 6 wherein the carbon nanostructures comprises a mixture of approximately 90% amorphous nanocarbon and 10% single-walled carbon nanotubes.

### Claim 10 (depends on 6)

A battery as claimed in claim 6 wherein the reversible capacity remains unaltered over at least 30 charging cycles.