# US 10,483,524 B2 · Nonaqueous electrolyte battery and battery pack

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- Number: US 10,483,524 B2
- Document ID: US10483524B2
- Status: Granted
- Kind: B2
- Application number: 15/261,031
- Filed: 2016-09-09
- Published: 2016-12-29
- Granted: 2019-11-19
- Earliest claimed: 2014-03-10
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Hidesato Saruwatari; Masataka Shikota; Dai Yamamoto
- Web page: https://patentgrep.com/patent/US10483524B2

## CPC

- 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence)
- 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 50/581: in response to temperature
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 50/211: adapted for pouch cells
- H01M 50/4295: {Natural cotton, cellulose or wood}
- H01M 50/44: Fibrous material
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

According to an embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, a separator sandwiched between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material having a Li-absorbing potential of 1 V vs. Li/Li+ or more. An electrical resistance of the negative electrode in a discharged state is within a range of 100 Ω·cm to 100000 Ω·cm. A pore volume ratio of pores having a pore diameter of 1 μm or more in the separator is more than 70%. The pore volume ratio is determined from a cumulative pore volume frequency curve of the separator obtained by a mercury intrusion porosimetry.

## Claims

### Claim 1

A nonaqueous electrolyte battery, comprising:
a positive electrode;
a negative electrode;
a separator sandwiched between the positive electrode and the negative electrode; and
a nonaqueous electrolyte,
wherein:
the negative electrode comprises a spinel-type lithium-titanium composite oxide as a negative electrode active material, Li4+xTi5O12 where 0≤x≤3, having a Li-absorbing potential of 1 V vs. Li/Li+ or more;
an electrical resistance of the negative electrode in a discharged state is within a range of 100 Ω·cm to 100000 Ω·cm;
a pore volume ratio of pores having a pore diameter of 1 μm or more in the separator is within a range of more than 70% to not more than 78%, the pore volume ratio being determined from a cumulative pore volume frequency curve of the separator according to a mercury intrusion porosimetry; and
a mode diameter in a pore diameter distribution curve of the separator according to the mercury intrusion porosimetry is within a range of 1.1 μm to 2.6 μm.

### Claim 2 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein a thickness of the separator is within a range of 3 μm to 25 μm.

### Claim 3 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein the electrical resistance of the negative electrode in the discharged state is within a range of 200 Ω·cm to 1000 Ω·cm.

### Claim 4 (depends on 1)

The nonaqueous electrolyte battery according to claim 1, wherein:
the negative electrode further comprises graphite as a conductive agent; and
a value of AB/CD for the negative electrode falls within a range from 4 to 25, where A (m2/g) is a specific surface area of the spinel-type lithium-titanium composite oxide, B is a weight content ratio of the spinel-type lithium-titanium composite oxide in the negative electrode, C (m2/g) is a specific surface area of the graphite, and D is a weight content ratio of the graphite in the electrode.

### Claim 5 (depends on 1)

A battery pack, comprising the nonaqueous electrolyte battery according to claim 1.

### Claim 6 (depends on 5)

The battery pack according to claim 5, further comprising a protective circuit.

### Claim 7 (depends on 1)

A battery pack, comprising a plurality of the nonaqueous electrolyte batteries according to claim 1, wherein the nonaqueous electrolyte batteries are electrically connected in series or in parallel, or in a combination of a series connection and a parallel connection.