# US 10,504,635 B2 · Carbonaceous material for nonaqueous electrolyte secondary battery negative electrode

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- Number: US 10,504,635 B2
- Document ID: US10504635B2
- Status: Granted
- Kind: B2
- Application number: 14/654,619
- Filed: 2014-02-19
- Published: 2015-11-26
- Granted: 2019-12-10
- Earliest claimed: 2013-02-19
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Makoto Imaji; Yasuhiro Tada; Naohiro Sonobe
- Web page: https://patentgrep.com/patent/US10504635B2

## CPC

- H01B 1/04: mainly consisting of carbon-silicon compounds, carbon or silicon
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/11: Powder tap density
- C01P 2006/12: Surface area
- C01P 2006/40: Electric properties
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- 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
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An object of the present invention is to provide a carbonaceous material for a negative electrode for producing a nonaqueous electrolyte secondary battery capable of rapid charge and discharge and having excellent rate characteristics (output characteristics) while maintaining a large discharge capacity. The problem described above can be solved by a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode of the present invention obtained by heat-treating a non-graphitizable carbon precursor which is pulverized and contains from 13 to 80 wt. % of a volatile component. With the present invention, it is possible to provide a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode, whereby a nonaqueous electrolyte secondary battery having a large charge-discharge capacity and having excellent rate characteristics can be produced.

## Claims

### Claim 1

A carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode obtained by heat-treating a non-graphitizable carbon precursor which is pulverized and contains more than 25.6 wt. % and not more than 80 wt.% of a volatile component after the pulverization,
wherein the carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode has a sulfur content of at most 4,000 ppm and a specific surface area ratio of greater than 5.5 and at most 11.0 calculated by the following formula:
the specific surface area ratio =BET/CALC;
wherein BET (Brunauer-Emmett-Teller) is a specific surface area having units of m2/g determined by a BET method, and CALC is a value obtained by a formula: 6/(Dv50×ρBt), wherein Dv50 is average particle size having units of pm and pm is butanol true density having units of g/cm3; and
wherein the heat-treating comprises a heat treatment in which the non-graphitizable carbon precursor is held for at least one minute at a temperature of from 250 to 800° C.

### Claim 2 (depends on 1)

The carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode according to claim 1, wherein the heat-treating comprises:
a main calcination with an attainment temperature of from 800 to 1,600° C.

### Claim 3 (depends on 1)

The carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode according to claim 1, wherein an average interlayer spacing d002 of a (002) face determined by X-ray diffraction is from 0.375 to 0.400 nm, and a true density is from 1.40 to 1.60 g/cm3.

### Claim 4

A method of producing a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode, the method comprising:
(1) a step of pulverizing a non-graphitizable carbon precursor to obtain a non-graphitizable carbon precursor containing more than 25.6 wt. % and not more than 80 wt.% of a volatile component;
(2) a heat treatment step of holding the pulverized non-graphitizable carbon precursor for at least one minute at a temperature of from 250 to 800° C.; and
(3) a calcination step of calcining the product at an attainment temperature of from 800 to 1,600° C.,
wherein the carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode has a sulfur content of at most 4,000 ppm and a specific surface area ratio of greater than 5.5 and at most 11.0 calculated by the following formula:
the specific surface area ratio =BET/CALC;
wherein BET (Brunauer-Emmett-Teller) is a specific surface area having units of m2/g determined by a BET method, and CALC is a value obtained by a formula: 6/(Dv50×ρBt), wherein Dv50 is average particle size having units of μm and ρBt is butanol true density having units of g/cm3.

### Claim 5 (depends on 1)

A negative electrode for a nonaqueous electrolyte secondary battery comprising the carbonaceous material for a negative electrode described in claim 1.

### Claim 6 (depends on 5)

A nonaqueous electrolyte secondary battery comprising the negative electrode according to claim 5.