# US 2019/0379047 A1 · Silicone ball containing electrode and lithium ion battery including the same

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- Number: US 2019/0379047 A1
- Document ID: US20190379047A1
- Status: Published application
- Kind: A1
- Application number: 16/477,426
- Filed: 2017-01-27
- Published: 2019-12-12
- Earliest claimed: 2017-01-27
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Qian CHENG; Noriyuki TAMURA
- Web page: https://patentgrep.com/patent/US20190379047A1

## CPC

- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0567: characterised by the additives
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- 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
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- H01M 2300/004: Three solvents
- Y02E 60/10: Energy storage using 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

## Abstract

The invention provides a lithium ion battery comprising: an anode comprising an anode active material layer on an anode current collector, the anode active material layer having a mass load higher than 60 g/m2; a cathode comprising a cathode active material layer on a cathode current collector, the cathode active material layer having a mass load higher than 80 g/m2; and an electrolytic solution comprising an imide anion based lithium salt and LiPO2F2, wherein at least one of the anode and cathode active material layers comprises a spacer comprising silicone ball.

## Claims

### Claim 1

A lithium ion battery, comprising:
an anode comprising an anode active material layer on an anode current collector, the anode active material layer having a mass load higher than 60 g/m2,
a cathode comprising a cathode active material layer on a cathode current collector, the cathode active material layer having a mass load higher than 80 g/m2, and
an electrolytic solution comprising an imide anion based lithium salt and LiPO2F2,
wherein at least one of the anode and cathode active material layers comprises a ball spacer comprising silicone ball.

### Claim 2 (depends on 1)

The lithium ion battery according to claim 1, wherein the silicone ball is modified the silicone chain with at least one functional group selected from the group consisting of hydrocarbons, oxygen-containing groups and nitrogen-containing groups.

### Claim 3 (depends on 1)

The lithium ion battery according to claim 1, wherein the diameter of the spacer is between 1 μm to 40 μm and the diameter ratio of the active material to the spacer is between 0.25 to 10.

### Claim 4 (depends on 1)

The lithium ion battery according to claim 1, wherein the additive weight ratio of the spacer is between 1% to 30% by mass.

### Claim 5 (depends on 1)

The lithium ion battery according to claim 1, wherein the electrolytic solution comprises a composite of the imide anion based lithium salt and a conventional lithium salt other than the imide anion based lithium salt as an electrolyte and the mole ratio of the imide anion based lithium salt to the conventional lithium salt is from 1/1 to 10/1.

### Claim 6 (depends on 1)

The lithium ion battery according to claim 1, wherein the total concentration of the electrolyte in the electrolytic solution is in the range of 0.1 to 3 moles/L.

### Claim 7 (depends on 1)

The lithium ion battery according to claim 1, wherein the cathode collector is made of aluminum.

### Claim 8 (depends on 1)

The lithium ion battery according to claim 1, wherein the electrolytic solution comprises ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) as solvents, with the volume ratio of ED/DMC/EMC being x:y:100-x-y, where x is 15 to 50% by volume, y is 20 to 60% by volume and x+y is less than 100% by volume.

### Claim 9 (depends on 1)

The lithium ion battery according to claim 1, wherein an amount of LiPO2F2 is 0.005 to 7% by mass in the electrolytic solution.

### Claim 10 (depends on 1)

The lithium ion battery according to claim 1, wherein the anode material layer comprises a carbon material as an active material and the carbon material is a graphite particle having pores on the surface and having hollow or interconnected pores, or interconnected inside cracks at the core part of the graphite particle.