# US 11,440,802 B2 · Electrode active material, method for manufacturing same, and lithium secondary battery comprising same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,440,802 B2
- Document ID: US11440802B2
- Status: Granted
- Kind: B2
- Application number: 16/613,795
- Filed: 2017-05-18
- Published: 2021-05-20
- Granted: 2022-09-13
- Earliest claimed: 2017-05-17
- Assignees: Foundation for Research and Business, Seoul National University of Science and Technology
- Applicants: Foundation for Research and Business, Seoul National University of Science and Technology
- Inventors: Hyo Jin Ahn; Do Young Lee; Geon Hyoung An
- Web page: https://patentgrep.com/patent/US11440802B2

## CPC

- C01B 32/90: Carbides
- H01M 4/587: for inserting or intercalating light metals
- B01D 9/0031: {by heating (B01D9/0022, B01D9/0027 take precedence)}
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- C01B 32/30: Active carbon
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- B01D 2009/0086: {Processes or apparatus therefor}
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/74: by peak-intensities or a ratio thereof only
- C01P 2004/03: obtained by SEM
- C01P 2004/60: Particles characterised by their size
- C01P 2006/12: Surface area
- C01P 2006/16: Pore diameter
- Y02E 60/10: Energy storage using batteries
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to an electrode active material, a method for manufacturing the same, and a lithium secondary battery comprising the same. A method for producing carbide using bean curd or waste bean curd according to an embodiment of the present invention comprises the steps of: drying bean curd or waste bean curd; thermally treating the dried bean curd or waste bean curd under an air atmosphere; and carbonizing the thermally treated bean curd or waste bean curd under an inert gas atmosphere.

## Claims

### Claim 1

A method for manufacturing a carbide using bean curd (tofu) or waste bean curd (tofu), the method comprising:
drying bean curd (tofu) or waste bean curd (tofu);
thermally treating the dried bean curd (tofu) or waste bean curd (tofu) under an air atmosphere; and
carbonizing the thermally treated bean curd (tofu) or waste bean curd (tofu) under an inert gas atmosphere.

### Claim 2 (depends on 1)

The method of claim 1, wherein a drying process is performed at a temperature of 40° C. to 200° C. for 24 hours to 100 hours.

### Claim 3 (depends on 1)

The method of claim 1, wherein a drying process is performed in at least any one dryer selected from the group consisting of a hot air dryer, a flash dryer, a cake dryer, and a ring dryer.

### Claim 4 (depends on 1)

The method of claim 1, wherein a thermal treatment process is performed at a temperature of 200° C. to 500° C. for 30 minutes to 10 hours.

### Claim 5 (depends on 1)

The method of claim 1, wherein a carbonization process is performed at a temperature of 500° C. to 900° C. for 30 minutes to 3 hours.

### Claim 6 (depends on 1)

The method of claim 1, wherein the method further comprises crystallizing a carbonized bean curd (tofu) or waste bean curd (tofu) under an inert gas atmosphere after the performing of a carbonization process.

### Claim 7 (depends on 6)

The method of claim 6, wherein a crystallization process is performed at a temperature of 1,000° C. to 1,500° C. for 30 minutes to 3 hours.

### Claim 8 (depends on 6)

The method of claim 6, wherein the method further comprises pulverizing a crystallized carbide after the performing of a crystallization process.

### Claim 9 (depends on 8)

The method of claim 8, wherein a pulverization process is performed by at least one pulverizer selected from the group consisting of a pin mill, a fine impact mill, a ball mill, beads mill, a rotor-mounted airflow type classifier, Dyno mill, a disc mill, a roll mill, and a cyclone.

### Claim 10 (depends on 1)

The method of claim 1, wherein the inert gas includes at least any one selected from the group consisting of nitrogen (N2), argon (Ar), helium (He), neon (Ne), krypton (Kr), and xenon (Xe).

### Claim 11 (depends on 1)

A carbide being manufactured by the method of claim 1, having an average interlayer spacing (d002) of a (002) plane of 3.7 Å to 4.0 Å, which is obtained by an X-ray diffraction method, a crystallite diameter Lc(002) in the C-axis direction of 0.8 nm to 2 nm, an R value of 1.3 to 2, and a peak intensity ratio (5° angle peak/002 peak) of 2° to 4° of an angle.

### Claim 12 (depends on 11)

The carbide of claim 11, wherein the carbide has an average particle size D50 of 10 nm to 50 μm.

### Claim 13 (depends on 11)

The carbide of claim 11, wherein the carbide has a specific surface area of 50 m2/g to 500 m2/g and an average pore size of 1 nm to 2 nm.

### Claim 14 (depends on 11)

A lithium secondary battery comprising an anode active material including the carbide of claim 11, wherein the lithium secondary battery has an irreversible capacity of 200 mAh/g to 600 mAh/g and a capacity retention rate at 50 cycles of 90% or more.