# US 12,218,353 B2 · Carbonaceous material, method for producing same, electrode active material for electrochemical device, electrode for electrochemical device, and electrochemical device

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- Number: US 12,218,353 B2
- Document ID: US12218353B2
- Status: Granted
- Kind: B2
- Application number: 17/627,825
- Filed: 2020-07-14
- Published: 2022-09-01
- Granted: 2025-02-04
- Earliest claimed: 2019-07-19
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Hiroyuki Nishinami; Yumika Nishita; Shushi Nishimura
- Web page: https://patentgrep.com/patent/US12218353B2

## CPC

- C01B 32/336: characterised by gaseous activating agents
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- C01B 32/378: Purification
- H01G 4/008: Selection of materials
- H01G 11/20: Reformation or processes for removal of impurities, e.g. scavenging
- H01G 11/24: characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
- H01G 11/32: Carbon-based
- H01G 11/44: Raw materials therefor, e.g. resins or coal
- H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34)
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/052: Li-accumulators
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- Y02E 60/13: Energy storage using capacitors
- 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
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An object of the present invention is to provide a carbonaceous material from which an electrochemical device having a high initial electrostatic capacitance, an excellent effect of suppressing gas generation during charging and discharging, and excellent durability can be obtained, and a method for producing the carbonaceous material, an electrode active material for an electrochemical device containing the carbonaceous material, an electrode for an electrochemical device containing the electrode active material, and an electrochemical device. The present invention relates to a carbonaceous material having a BET specific surface area of 1550 to 2500 m2/g, a value of an oxygen content/hydrogen content per specific surface area of 1.00 to 2.10 mg/m2, and an electrical conductivity of 10 to 15 S/cm determined by powder resistance measurement at a load of 12 kN.

## Claims

### Claim 1

A carbonaceous material having a BET specific surface area of 1550 to 2500 m2/g, a value of an oxygen content/hydrogen content per specific surface area of 1.00 to 2.10 mg/m2, and an electrical conductivity of 10 to 15 S/cm determined by powder resistance measurement at a load of 12 kN.

### Claim 2 (depends on 1)

The carbonaceous material according to claim 1, the carbonaceous material having a value of an oxygen content/hydrogen content of 2.0 to 4.3.

### Claim 3 (depends on 1)

The carbonaceous material according to claim 1, wherein the carbonaceous material is based on a carbon precursor derived from a plant.

### Claim 4 (depends on 3)

The carbonaceous material according to claim 3, wherein the carbon precursor is derived from a coconut shell.

### Claim 5 (depends on 1)

An electrode active material formed from the carbonaceous material according to claim 1.

### Claim 6 (depends on 5)

An electrode, comprising:
the electrode active material according to claim 5.

### Claim 7 (depends on 6)

An electrochemical device, comprising:
the electrode according to claim 6.

### Claim 8 (depends on 1)

A method for producing the carbonaceous material according to claim 1, the method comprising:
a heating step of heating a carbonaceous material precursor to a first temperature of 330° C. or higher under a first oxidizing gas atmosphere;
an acid washing step of washing the carbonaceous material precursor with a washing liquid containing an acid;
a deacidification step of heating the carbonaceous material precursor after the acid washing to a second temperature of 330° C. or higher under a second oxidizing gas atmosphere; and
a temperature lowering step of lowering a temperature of the carbonaceous material precursor under a non-oxidizing gas atmosphere after the deacidification,
wherein the carbonaceous material precursor used for the deacidification step has an electrical conductivity of 11 to 16 S/cm determined by powder resistance measurement at a load of 12 kN.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the temperature of the carbonaceous material precursor is lowered to 200° C. or lower in the temperature lowering step.