# US 2014/0154557 A1 · Energy storage device and energy storage unit

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- Number: US 2014/0154557 A1
- Document ID: US20140154557A1
- Status: Published application
- Kind: A1
- Application number: 14/094,247
- Filed: 2013-12-02
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: GS Yuasa International Ltd.
- Applicants: GS Yuasa International Ltd.
- Inventors: Sumio MORI; Kenta Nakai; Akihiko Miyazaki; Tomonori Kako
- Web page: https://patentgrep.com/patent/US20140154557A1

## CPC

- H01M 4/587: for inserting or intercalating light metals
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding
- H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks
- H01M 10/0567: characterised by the additives
- 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

An energy storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, wherein the negative electrode includes a negative electrode active material layer containing a non-graphitizable carbon as a negative electrode active material, and the negative electrode active material has a negative electrode active material weight per unit volume of the negative electrode active material layer of 0.92 g/cc or more and 1.13 g/cc or less and a particle size D90 of 4.3 μm or more and 11.5 μm or less, the particle size D90 being a particle size in particle size distribution in which a cumulative volume is 90%.

## Claims

### Claim 1

An energy storage device comprising:
a positive electrode;
a negative electrode;
a separator disposed between the positive electrode and the negative electrode; and
a non-aqueous electrolyte,
wherein the negative electrode includes a negative electrode active material layer comprising a non-graphitizable carbon as a negative electrode active material, and
the negative electrode active material has a negative electrode active material weight per unit volume of the negative electrode active material layer of 0.92 g/cc or more and 1.13 g/cc or less and a particle size D90 of 4.3 μm or more and 11.5 μm or less, the particle size D90 being a particle size in particle size distribution in which a cumulative volume is 90%.

### Claim 2 (depends on 1)

The energy storage device according to claim 1,
wherein a relation A1=−0.014×B1+C1 (where 4.3≦B1≦8.5, and 1.04≦C1≦1.20) is satisfied wherein the negative electrode active material weight per unit volume of the negative electrode active material layer is A1 g/cc and the particle size D90 of the negative electrode active material is B1 μm.

### Claim 3 (depends on 1)

The energy storage device according to claim 1, wherein the negative electrode active material has a particle size D50 of 2.7 μm or more and 5.9 μm or less, the particle size D50 being a particle size in particle size distribution in which the cumulative volume is 50%.

### Claim 4 (depends on 3)

The energy storage device according to claim 3, wherein a relation A2=−0.003×B2+C2 (where 2.7≦B2≦4.6, and 1.05≦C2≦1.21) is satisfied wherein the negative electrode active material weight per unit volume of the negative electrode active material layer is A2 g/cc and the particle size D50 of the negative electrode active material is B2 μm.

### Claim 5 (depends on 1)

The energy storage device according to claim 1, further comprising:
a negative electrode terminal; and
a negative electrode current collector that electrically connects the negative electrode terminal to the negative electrode,
wherein the negative electrode includes a region having no negative electrode active material layer in which the negative electrode active material layer is not formed, and
the negative electrode current collector is joined to the region having no negative electrode active material layer to electrically connect the negative electrode terminal to the negative electrode.

### Claim 6 (depends on 1)

The energy storage device according to claim 1, wherein the non-aqueous electrolyte contains an additive, and the additive is a coating forming material for forming a coating on a surface of the negative electrode.

### Claim 7 (depends on 1)

An energy storage unit comprising a plurality of the energy storage devices according to claim 1.