# US 8,568,928 B2 · Non-aqueous electrolyte secondary battery

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

- Number: US 8,568,928 B2
- Document ID: US8568928B2
- Status: Granted
- Kind: B2
- Application number: 11/976,088
- Filed: 2007-10-19
- Published: 2008-04-24
- Granted: 2013-10-29
- Earliest claimed: 2006-10-19
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: Hironori Shirakata; Koji Hasumi; Hiroyuki Akita; Kazunori Donoue; Yoshinori Kida
- Inventors: Hironori Shirakata; Koji Hasumi; Hiroyuki Akita; Kazunori Donoue; Yoshinori Kida
- Web page: https://patentgrep.com/patent/US8568928B2

## CPC

- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/1397: of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A non-aqueous electrolyte secondary battery has a positive electrode (1), a negative electrode (2), and a non-aqueous electrolyte. The positive electrode has a positive electrode mixture layer containing a positive electrode active material, a binder agent, and a conductive agent. The positive electrode active material in the positive electrode mixture layer contains an olivine-type lithium-containing metal phosphate represented by the general formula LixMPO4, where M is at least one element selected from the group consisting of Co, Ni, Mn, and Fe, and x is 0<x<1.3. The conductive agent in the positive electrode mixture layer is composed of a mixture of carbon particles and carbon fiber.

## Claims

### Claim 1

A non-aqueous electrolyte secondary battery comprising:
a negative electrode comprising graphite as a negative electrode active material;
a non-aqueous electrolyte; and
a positive electrode having a positive electrode mixture layer comprising a positive electrode active material, a binder agent, and a conductive agent, wherein:
the positive electrode active material of the positive electrode mixture layer comprises an olivine-type lithium-containing metal phosphate represented by the general formula LixMPO4, where M is at least one element selected from the group consisting of Co, Ni, Mn, and Fe, and x is 0≦x≦1.3; and
the conductive agent of the positive electrode mixture layer comprises a mixture of carbon particles and carbon fiber, wherein the carbon particles are carbon black; the carbon fiber has a diameter of 50-300 nm, a length of 5-100 μm and a specific surface area of 30 m2/g or less, and the amount of the carbon particles in the conductive agent is within the range of from 2 wt. % to 8 wt. % with respect to the total weight of the positive electrode mixture layer.

### Claim 2 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the olivine-type lithium-containing metal phosphate is an olivine-type lithium iron phosphate represented by the general formula LixFePO4, where 0<x<1.3.

### Claim 3 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the amount of the conductive agent is within the range of from 5 wt. % to 20 wt. % with respect to the total weight of the positive electrode mixture layer.

### Claim 4 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein the amount of the conductive agent is within the range of from 5 wt. % to 20 wt. % with respect to the total weight of the positive electrode mixture layer.

### Claim 5 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the positive electrode mixture layer is coated on a positive electrode current collector, and the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 70 g/m2 to 125 g/m2.

### Claim 6 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein the positive electrode mixture layer is coated on a positive electrode current collector, and the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 70 g/m2 to 125 g/m2.

### Claim 7 (depends on 3)

The non-aqueous electrolyte secondary battery according to claim 3, wherein the positive electrode mixture layer is coated on a positive electrode current collector, and the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 70 g/m2 to 125 g/m2.

### Claim 8 (depends on 4)

The non-aqueous electrolyte secondary battery according to claim 4, wherein the positive electrode mixture layer is coated on a positive electrode current collector, and the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 70 g/m2 to 125 g/m2.

### Claim 9 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 80 g/m2 to 115 g/m2.

### Claim 10 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 80 g/m2 to 115 g/m2.

### Claim 11 (depends on 3)

The non-aqueous electrolyte secondary battery according to claim 3, wherein the amount of the positive electrode mixture applied per one side of the positive electrode current collector is within the range of from 80 g/m2 to 115 g/m2.

### Claim 12 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein at least one current collector tab is attached to each of the positive electrode and the negative electrode, and two or more current collector tabs are attached to at least one of the positive electrode and the negative electrode.

### Claim 13 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein at least one current collector tab is attached to each of the positive electrode and the negative electrode, and two or more current collector tabs are attached to at least one of the positive electrode and the negative electrode.

### Claim 14 (depends on 3)

The non-aqueous electrolyte secondary battery according to claim 3, wherein at least one current collector tab is attached to each of the positive electrode and the negative electrode, and two or more current collector tabs are attached to at least one of the positive electrode and the negative electrode.

### Claim 15 (depends on 12)

The non-aqueous electrolyte secondary battery according to claim 12, wherein the positive electrode and the negative electrode are wound together with a separator interposed therebetween to form a winding, and two current collector tabs are attached to two respective portions of the negative electrode, one portion being a starting end of the negative electrode in the winding and the other being a terminating end of the negative electrode in the winding.

### Claim 16 (depends on 13)

The non-aqueous electrolyte secondary battery according to claim 13, wherein the positive electrode and the negative electrode are wound together with a separator interposed therebetween, and two current collector tabs are attached to two respective portions of the negative electrode, one portion being a starting end of the negative electrode in the winding and the other being a terminating end of the negative electrode in the winding.

### Claim 17 (depends on 14)

The non-aqueous electrolyte secondary battery according to claim 14, wherein the positive electrode and the negative electrode are wound together with a separator interposed therebetween, and two current collector tabs are attached to two respective portions of the negative electrode, one portion being a starting end of the negative electrode in the winding and the other being a terminating end of the negative electrode in the winding.