# US 2014/0193689 A1 · Electrochemical cell, method of producing electrochemical cell, battery pack, and car

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- Number: US 2014/0193689 A1
- Document ID: US20140193689A1
- Status: Published application
- Kind: A1
- Application number: 14/202,753
- Filed: 2014-03-10
- Published: 2014-07-10
- Earliest claimed: 2012-03-22
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Norio TAKAMI; Yasuhiro HARADA; Keigo HOSHINA
- Web page: https://patentgrep.com/patent/US20140193689A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 10/0562: Solid materials
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/615: Heating or keeping warm
- H01M 4/623: {fluorinated polymers}
- 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
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

According to one embodiment, an electrochemical cell includes a positive electrode, a negative electrode, a sulfide-based solid electrolyte layer and an oxide-based solid electrolyte layer. The positive electrode includes positive electrode active material particles which absorb and release lithium ions at a potential of 3 V (vs. Li/Li+) or more. The sulfide-based solid electrolyte layer is bonded to the negative electrode. The oxide-based solid electrolyte layer has a thickness of 0.5 μm or less and is provided on surfaces of the positive electrode active material particles.

## Claims

### Claim 1

An electrochemical cell comprising:
a positive electrode comprising positive electrode active material particles which absorb and release lithium ions at a potential of 3 V (vs. Li/Li+) or more;
a negative electrode comprising a negative electrode active material;
a sulfide-based solid electrolyte layer which is bonded to the negative electrode; and
an oxide-based solid electrolyte layer having a thickness of 0.5 μm or less which is provided on surfaces of the positive electrode active material particles.

### Claim 2 (depends on 1)

An electrochemical cell according to claim 1, comprising a carbon layer.

### Claim 3 (depends on 1)

An electrochemical cell according to claim 1, wherein the positive electrode comprises a positive electrode current collector, and a positive electrode material layer comprising the positive electrode active material particles and provided on the positive electrode current collector,
and the negative electrode comprises a negative electrode current collector, and a negative electrode material layer comprising the negative electrode active material and provided on the negative electrode current collector, and the electrochemical cell comprises a carbon layer provided on the positive or negative electrode material layer, or the positive or negative electrode current collector.

### Claim 4 (depends on 1)

An electrochemical cell according to claim 1, wherein the sulfide-based solid electrolyte layer contains metallic oxide particles.

### Claim 5 (depends on 1)

An electrochemical cell according to claim 1, wherein the negative electrode active material contains at least one selected from the group consisting of lithium titanium oxide, titanium oxide, niobium oxide, silicon oxide, silicon, silicon alloy, and metal sulfide.

### Claim 6 (depends on 1)

A battery pack comprising the electrochemical cell according to claim 1.

### Claim 7 (depends on 6)

The battery pack according to claim 6, comprising a heater that heats the electrochemical cell.

### Claim 8 (depends on 6)

A car comprising the battery pack according to claim 6.

### Claim 9

A method of producing an electrochemical cell comprising:
forming a positive electrode material layer on a surface of a positive electrode current collector using a nonaqueous slurry to produce a positive electrode, and the nonaqueous slurry containing an oxide-based solid electrolyte, positive electrode active material particles absorbing and releasing lithium ions at a potential of 3 V (vs. Li/Li+) or more and an oxide-based solid electrolyte layer provided on surfaces of the positive electrode active material particles;
forming a negative electrode material layer on a surface of a negative electrode current collector using a slurry to produce a negative electrode, and the slurry containing a negative electrode active material and a sulfide-based solid electrolyte; and
disposing the positive electrode and the negative electrode with interposing a sulfide-based solid electrolyte layer between the positive electrode material layer and the negative electrode material layer, and with providing a carbon layer on the positive or negative electrode material layer, or the positive or negative electrode current collector, and integrating a resulting laminate by thermocompression bonding.