# US 10,483,594 B2 · Positive electrode plates for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary batteries

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

- Number: US 10,483,594 B2
- Document ID: US10483594B2
- Status: Granted
- Kind: B2
- Application number: 15/541,841
- Filed: 2015-09-29
- Published: 2018-01-11
- Granted: 2019-11-19
- Earliest claimed: 2015-01-20
- Assignees: Panasonic Corporation; Sanyo Electric Co., Ltd.
- Applicants: Panasonic Corporation; Sanyo Electric Co., Ltd.
- Inventors: Hiroshi Kawada; Motoharu Saito; Kenichi Hotehama; Yoshinori Aoki
- Web page: https://patentgrep.com/patent/US10483594B2

## CPC

- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/48: of inorganic oxides or hydroxides
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- 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 positive electrode plate (11) includes a current collector (30) and a mixture layer (31) disposed on the current collector (30). The mixture layer (31) has a thin portion (32) with a thickness of less than 200 μm disposed on an inner coil half of the current collector (30) and a thick portion (33) having a larger thickness than the thin portion (32), the thick portion (33) having a yield loop height H measured by a stiffness test of 6 mm<H<15 mm.

## Claims

### Claim 1

A positive electrode plate for wound nonaqueous electrolyte secondary batteries, comprising:
a current collector, and
a mixture layer disposed on the current collector,
the mixture layer having a thin portion with a thickness of less than 200 μm disposed on an inner coil half of the current collector and a thick portion having a larger thickness than the thin portion, the thick portion having a yield loop height H measured by a stiffness test of 6 mm<H<15 mm.

### Claim 2 (depends on 1)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 1, wherein the thickness of the thick portion is 200 μm or above.

### Claim 3 (depends on 1)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 1, wherein the ratio (a1/a2) of a thickness (a1) of the thin portion to a thickness (a2) of the thick portion is 0.4<(a1/a2)<0.8.

### Claim 4 (depends on 1)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 1, wherein the thin portion is formed only in a region from an inner coil end of the current collector to less than 20% of the length in the winding direction of the current collector.

### Claim 5 (depends on 1)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 1, wherein the mixture layers are disposed on both sides of the current collector,
a thickness (a1) of the thin portion is not less than 100 μm and not more than 180 μm as the total of the thicknesses on both sides of the current collector, and
a thickness (a2) of the thick portion is not less than 220 μm and not more than 320 μm as the total of the thicknesses on both sides of the current collector.

### Claim 6 (depends on 1)

A nonaqueous electrolyte secondary battery comprising:
the positive electrode plate for nonaqueous electrolyte secondary batteries described in claim 1,
a negative electrode plate, and
a nonaqueous electrolyte.

### Claim 7 (depends on 1)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 1, wherein the thickness of the thick portion is substantially the same along a winding direction.

### Claim 8 (depends on 7)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 7, wherein the mixture layers have a step at the border between the thin portion and the thick portion.

### Claim 9 (depends on 7)

The positive electrode plate for nonaqueous electrolyte secondary batteries according to claim 7, wherein the thin portion is gradually increased in thickness toward the thick portion.