# US 8,785,052 B2 · Nonaqueous electrolyte battery, battery pack and vehicle

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- Number: US 8,785,052 B2
- Document ID: US8785052B2
- Status: Granted
- Kind: B2
- Application number: 14/052,537
- Filed: 2013-10-11
- Published: 2014-02-06
- Granted: 2014-07-22
- Earliest claimed: 2007-03-28
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Hidesato Saruwatari; Hideaki Morishima; Hiroki Inagaki; Norio Takami
- Web page: https://patentgrep.com/patent/US8785052B2

## CPC

- H01M 4/48: of inorganic oxides or hydroxides
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/052: Li-accumulators
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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 battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode contains a lithium compound and a negative electrode current collector supporting the lithium compound. A log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak. A specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m2/g. A ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

## Claims

### Claim 1

A nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode containing a lithium compound and a negative electrode current collector, supporting the lithium compound; and
a nonaqueous electrolyte,
wherein a log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak,
a specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m2/g, and
a ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

### Claim 2 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein a volume of pores measured by the mercury porosimetry is 0.1 to 0.5 mL per 1 g of the negative electrode, excluding the negative electrode current collector.

### Claim 3 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein the lithium compound includes lithium-titanium oxide.

### Claim 4 (depends on 3)

The nonaqueous electrolyte battery according to claim 3, wherein the lithium-titanium oxide has a spinel structure or a ramsdellite structure.

### Claim 5 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein the peak exists in a pore size diameter range of 0.04 to 0.1 μm.

### Claim 6 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein the ratio is 20 to 90%.

### Claim 7

A battery pack comprising a nonaqueous electrolyte battery, the nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode containing a lithium compound and a negative electrode current collector supporting the lithium compound; and
a nonaqueous electrolyte,
wherein a log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak,
a specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m2/g, and
a ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

### Claim 8 (depends on 7)

The battery pack according to claim 7, wherein a volume of pores measured by mercury porosimetry is 0.1 to 0.5 mL per 1 g of the negative electrode, excluding the negative electrode current collector.

### Claim 9 (depends on 7)

The battery pack according to claim 7, wherein the lithium compound includes lithium-titanium oxide.

### Claim 10 (depends on 9)

The battery pack according to claim 9, wherein the lithium-titanium oxide has a spinel structure or a ramsdellite structure.

### Claim 11 (depends on 7)

The battery pack according to claim 7, wherein the peak exists in a pore size diameter range of 0.04 to 0.1 μm.

### Claim 12 (depends on 7)

The battery pack according to claim 7, wherein the ratio is 20 to 90%.

### Claim 13 (depends on 1)

A vehicle comprising the nonaqueous electrolyte battery according to claim 1.