# US 2014/0154583 A1 · Nonaqueous electrolyte secondary battery

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- Number: US 2014/0154583 A1
- Document ID: US20140154583A1
- Status: Published application
- Kind: A1
- Application number: 14/234,697
- Filed: 2011-07-25
- Published: 2014-06-05
- Earliest claimed: 2011-07-25
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Tomoyoshi Ueki; Harunari Shimamura; Yusuke Fukumoto
- Web page: https://patentgrep.com/patent/US20140154583A1

## CPC

- H01M 10/625: Vehicles
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M 50/491: Porosity
- H01M 10/052: Li-accumulators
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A nonaqueous electrolyte secondary battery 100 according to this invention includes a positive electrode 10, a negative electrode 20, a separator 40 interposed between the positive electrode 10 and the negative electrode 20, and a nonaqueous electrolyte solution. A porous heat-resistant layer 42 is additionally provided between the separator 40 and at least one electrode from among the positive electrode 10 and the negative electrode 20. The porous heat-resistant layer 42 includes hollow particles 44 made of an inorganic material, and a binder 46.

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte solution,
the nonaqueous electrolyte secondary battery further comprising a porous heat-resistant layer that is disposed between the separator and at least one electrode from among the positive electrode and the negative electrode, and that is formed on a surface of at least one of the positive electrode and the separator,
wherein the porous heat-resistant layer includes hollow particles made of an inorganic material and also includes a binder.

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the hollow particles have a hollowness of from 3% to 30%.

### Claim 3 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the hollow particles have an average particle diameter of at least 0.5 μm.

### Claim 4 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the porous heat-resistant layer has a porosity of at least 45%.

### Claim 5

(canceled)

### Claim 6 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the hollow particles are formed of at least one type of inorganic compound selected from the group consisting of alumina, magnesia, zirconia, silica, boehmite and titania.