# US 5,344,726 A · Carbon anode for secondary battery

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- Number: US 5,344,726 A
- Document ID: US5344726A
- Status: Granted
- Kind: A
- Application number: 08/079,086
- Filed: 1993-06-17
- Granted: 1994-09-06
- Earliest claimed: 1991-06-17
- Assignees: Sharp Kabushiki Kaisha
- Inventors: Hideaki Tanaka; Takehito Mitate; Hiroyuki Kitayama; Kuzuo Yamada
- Web page: https://patentgrep.com/patent/US5344726A

## CPC

- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- D01F 11/12: with inorganic substances {; Intercalation}
- D01F 11/125: {Carbon}
- D01F 11/129: {Intercalated carbon- or graphite fibres}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/96: Carbon-based electrodes
- H01M 4/043: {involving compressing or compaction}
- H01M 4/621: {Binders}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/74: Meshes or woven material; Expanded metal
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/027: {Negative electrodes}
- H01M 2300/0017: Non-aqueous electrolytes
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A carbon anode for a secondary battery in which a carbon active material of the carbon anode is covered with an amorphous carbon.

## Claims

### Claim 1

A carbon anode for a secondary battery comprising a core of highly crystalline carbon covered with a layer of amorphous carbon:
in which the highly crystalline carbon has an interlayer distance in the c-axis direction of from 0.335 to 0.340 nm and a ratio of the peak value at 1360 cm.sup.-1 to the peak value at 1580 cm.sup.-1 in argon ion laser Raman spectra is less than 0.4.

### Claim 2 (depends on 1)

A carbon anode for a secondary battery according to claim 1, wherein the secondary battery is lithium secondary battery.

### Claim 3 (depends on 1)

A carbon anode for a secondary battery according to claim 1, in which the amorphous carbon has a turbostratic structure and the turbostratic structure has an interlayer distance in the c-axis direction of from 0.343 to 0.355 nm.