# US 2018/0323433 A1 · Carbonaceous material for non-aqueous electrolyte secondary battery, negative electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for producing carbonaceous material for non-aqueous electrolyte secondary battery

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- Number: US 2018/0323433 A1
- Document ID: US20180323433A1
- Status: Published application
- Kind: A1
- Application number: 15/770,866
- Filed: 2016-10-27
- Published: 2018-11-08
- Earliest claimed: 2015-10-30
- Assignees: Kuraray Co., Ltd.; Kureha Corporation
- Applicants: Kuraray Co., Ltd.; Kureha Corporation
- Inventors: Tomohiro KAWAKAMI; Sayaka IDE; Takafumi IZAWA; Taketoshi OKUNO; Jun-Sang CHO; Hideharu IWASAKI
- Web page: https://patentgrep.com/patent/US20180323433A1

## CPC

- H01M 4/587: for inserting or intercalating light metals
- 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2002/76: by a space-group or by other symmetry indications
- C01P 2002/78: by stacking-plane distances or stacking sequences
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/10: Solid density
- C01P 2006/12: Surface area
- C01P 2006/40: Electric properties
- C01P 2006/80: Compositional purity
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- 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

An object of the present invention is to provide a carbonaceous material (carbonaceous material for a non-aqueous electrolyte secondary battery) used for a negative electrode of a non-aqueous electrolyte secondary battery (e.g., a lithium ion secondary battery) exhibiting favorable charge/discharge capacities and low resistance and having favorable resistance to oxidative degradation. The present invention relates to a carbonaceous material for a non-aqueous electrolyte secondary battery, having an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area within a range of 20 to 65 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.3 mass % or less, an oxygen element content of 2.5 mass % or less, and an average particle diameter of 1 to 4 μm according to a laser scattering method.

## Claims

### Claim 1

A carbonaceous material for a non-aqueous electrolyte secondary battery, having an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area within a range of 20 to 65 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.3 mass % or less, an oxygen element content of 2.5 mass % or less, and an average particle diameter of 1 to 4 μm according to a laser scattering method.

### Claim 2 (depends on 1)

The carbonaceous material for a non-aqueous electrolyte secondary battery according to claim 1, wherein the material has a potassium element content of 0.1 mass % or less and an iron element content of 0.02 mass % or less.

### Claim 3 (depends on 1)

The carbonaceous material for a non-aqueous electrolyte secondary battery according claim 1, wherein the material has a true density of 1.4 to 1.7 g/cm3 obtained by a butanol method.

### Claim 4 (depends on 1)

A negative electrode for a non-aqueous electrolyte secondary battery, comprising the carbonaceous material for a non-aqueous electrolyte secondary battery according to claim 1.

### Claim 5 (depends on 4)

A non-aqueous electrolyte secondary battery, comprising the negative electrode for a non-aqueous electrolyte secondary battery according to claim 4.

### Claim 6

A method for producing a carbonaceous material for a non-aqueous electrolyte secondary battery, the method comprising: a calcining step of calcining a carbon precursor or a mixture of the carbon precursor and a volatile organic substance under an inert gas atmosphere at 800 to 1400° C.

### Claim 7 (depends on 6)

The method for producing a carbonaceous material for a non-aqueous electrolyte secondary battery according to claim 6, comprising:
the calcining step, and
a post-pulverization step, a post-classification step, or both, of adjusting the specific surface area of the carbonaceous material obtained by a nitrogen adsorption BET three-point method to 20 to 75 m2/g through pulverization, classification, or both.

### Claim 8 (depends on 6)

The method according to claim 6, further comprising a pre-pulverization step, a pre-classification step, or both, of adjusting the specific surface area of the carbon precursor obtained by a nitrogen adsorption BET three-point method to 100 to 800 m2/g through pulverization, classification, or both.

### Claim 9 (depends on 6)

The method according to claim 6, wherein the carbon precursor is derived from a plant.

### Claim 10 (depends on 6)

The method according to claim 6, wherein the volatile organic substance is in a solid state at ordinary temperature and has a residual carbon ratio of less than 5 mass %.

### Claim 11 (depends on 6)

The method according to claim 6, wherein the carbonaceous material has an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a nitrogen element content of 0.3 mass % or less, an oxygen element content of 2.5 mass % or less, and an average particle diameter of 1 to 4 μm according to a laser scattering method.

### Claim 12 (depends on 6)

The method according to claim 6, wherein the carbonaceous material has a potassium element content of 0.1 mass % or less and an iron element content of 0.02 mass % or less.

### Claim 13 (depends on 6)

The method according to claim 6, wherein the carbonaceous material has a true density of 1.4 to 1.7 g/cm3 obtained by a butanol method.