# US 10,122,018 B2 · Negative electrode material for lithium-ion secondary battery,method for manufacturing negative electrode material for lithium-ion secondary battery, negative electrode material slurry for lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, and lithium-ion secondary battery

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- Number: US 10,122,018 B2
- Document ID: US10122018B2
- Status: Granted
- Kind: B2
- Application number: 15/127,875
- Filed: 2015-03-24
- Published: 2017-04-20
- Granted: 2018-11-06
- Earliest claimed: 2014-03-25
- Assignees: Hitachi Chemical Company, Ltd.
- Applicants: Hitachi Chemical Company, Ltd.
- Inventors: Hideyuki Tsuchiya; Takashi Sakamoto; Takeshi Masayoshi
- Web page: https://patentgrep.com/patent/US10122018B2

## CPC

- H01M 4/587: for inserting or intercalating light metals
- C01B 32/20: Graphite
- C01B 32/205: Preparation
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/621: {Binders}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2002/82: by IR- or Raman-data
- C01P 2004/03: obtained by SEM
- C01P 2004/32: Spheres
- C01P 2006/11: Powder tap density
- C01P 2006/12: Surface area
- C01P 2006/14: Pore volume
- C01P 2006/16: Pore diameter
- C01P 2006/40: Electric properties
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- 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

A negative electrode material for a lithium-ion secondary battery, in which the negative electrode material includes a composite particle including a spherical graphite particle and plural graphite particles that have a compressed shape and that aggregate or are combined so as to have nonparallel orientation planes, and the negative electrode material has an R-value in a Raman measurement of from 0.03 to 0.10, and has a pore volume as obtained by mercury porosimetry of from 0.2 mL/g to 1.0 mL/g in a pore diameter range of from 0.1 μm to 8 μm.

## Claims

### Claim 1

A negative electrode material for a lithium-ion secondary battery, the negative electrode material comprising a composite particle including a spherical graphite particle and a plurality of graphite particles that have a compressed shape and an aspect ratio ranging from 1.2 to 5 and that aggregate or are combined so as to have nonparallel orientation planes, and the negative electrode material having an R-value in a Raman measurement of from 0.03 to 0.10, and having a pore volume as obtained by mercury porosimetry of from 0.2 mL/g to 1.0 mL/g in a pore diameter range of from 0.1 μm to 8 μm.

### Claim 2 (depends on 1)

The negative electrode material for a lithium-ion secondary battery according to claim 1, wherein a specific surface area of the negative electrode material, as measured by a BET method, is from 1.5 m2/g to 6.0 m2/g.

### Claim 3 (depends on 1)

The negative electrode material for a lithium-ion secondary battery according to claim 1, wherein a saturated tap density of the negative electrode material is from 0.8 to 1.2 g/cm3.

### Claim 4 (depends on 1)

The negative electrode material for a lithium-ion secondary battery according to claim 1, wherein of the negative electrode material has an intensity ratio (P2/P1) of a diffraction peak (P2) for a (101) plane of a rhombohedral crystal structure to a diffraction peak (P1) of a (101) plane for a hexagonal crystal structure in a CuKα X-ray diffraction pattern is 0.35 or less.

### Claim 5 (depends on 1)

The negative electrode material for a lithium-ion secondary battery according to claim 1, wherein the spherical graphite particle has a circularity of 0.8 or higher.

### Claim 6 (depends on 1)

A method of manufacturing the negative electrode material for a lithium-ion secondary battery according to claim 1, the method comprising steps of:
(a) mixing a graphitizable aggregate or graphite with a graphitizable binder, a graphitization catalyst, and a spherical graphite particle; and
(b) calcining the mixture.

### Claim 7 (depends on 6)

The method of manufacturing the negative electrode material for a lithium-ion secondary battery according to claim 6, comprising, between the steps (a) and (b), at least one step selected from the group consisting of (c) molding the mixture and (d) subjecting the mixture to a heat treatment.

### Claim 8 (depends on 1)

A negative electrode material slurry for a lithium-ion secondary battery, the negative electrode material slurry comprising:
the negative electrode material for a lithium-ion secondary battery according to claim 1;
an organic binder; and
a solvent.

### Claim 9 (depends on 1)

A negative electrode for a lithium-ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer formed on the current collector and comprising the negative electrode material for a lithium-ion secondary battery according to claim 1.

### Claim 10 (depends on 9)

A lithium-ion secondary battery, comprising:
a positive electrode;
an electrolyte; and
the negative electrode for a lithium-ion secondary battery according to claim 9.