# US 9,882,246 B2 · Electrochemical energy storing device

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- Number: US 9,882,246 B2
- Document ID: US9882246B2
- Status: Granted
- Kind: B2
- Application number: 14/720,706
- Filed: 2015-05-22
- Published: 2015-09-10
- Granted: 2018-01-30
- Earliest claimed: 2013-08-27
- Assignees: Panasonic Corporation; Kyoto University
- Applicants: Panasonic Corporation; Kyoto University
- Inventors: Toru Matsui; Toshiro Hirai; Jun-ichi Yamaki; Zempachi Ogumi
- Web page: https://patentgrep.com/patent/US9882246B2

## CPC

- H01M 10/0569: characterised by the solvents
- H01G 11/02: using combined reduction-oxidation reactions, e.g. redox arrangement or solion
- H01G 11/04: Hybrid capacitors
- H01G 11/22: Electrodes
- H01G 11/54: Electrolytes
- H01G 11/60: characterised by the solvent
- H01G 11/62: characterised by the solute, e.g. salts, anions or cations therein
- H01M 4/364: {as mixtures}
- H01M 4/582: {Halogenides}
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/60: of organic compounds
- H01M 10/052: Li-accumulators
- H01M 10/0568: characterised by the solutes
- H01G 11/32: Carbon-based
- H01M 4/625: {Carbon or graphite}
- H01M 6/16: with organic electrolyte (H01M6/18 takes precedence)
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0028: characterised by the solvent
- H01M 2300/0045: Room temperature molten salts comprising at least one organic ion
- Y02E 60/10: Energy storage using batteries
- Y02E 60/13: Energy storage using capacitors
- 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
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electrochemical energy storing device disclosed herein includes a positive electrode containing a positive-electrode active material, a negative electrode, and a nonaqueous electrolyte solution which is in contact with the positive electrode and the negative electrode. The positive-electrode active material in a discharged state contains at least one selected from the group consisting of an alkali metal chloride, an alkaline-earth metal chloride, and a quaternary alkylammonium chloride. The nonaqueous electrolyte solution contains, as a solvent, an ionic liquid including cations having an alkoxyalkyl group as a component.

## Claims

### Claim 1

An electrochemical energy storing device comprising:
a positive electrode containing a positive-electrode active material;
a negative electrode; and
a nonaqueous electrolyte solution which is in contact with the positive electrode and the negative electrode and contains, as a solvent, an ionic liquid including cations having an alkoxyalkyl group as a component, the ionic liquid being a major component of the solvent, wherein:
in a discharged state, the positive-electrode active material contains at least one selected from the group consisting of (1) an alkali metal chloride, (2) an alkaline-earth metal chloride, and (3) a quaternary alkylammonium chloride,
the ionic liquid of the nonaqueous electrolyte solution dissolves (1) the alkali metal chloride contained in the positive-electrode active material, (2) the alkaline-earth metal chloride contained in the positive-electrode active material, and/or (3) the quaternary alkylammonium chloride contained in the positive-electrode active material, and
the nonaqueous electrolyte solution has (1) an alkali metal ion conductivity in the case where the positive-electrode active material contains the alkali metal chloride, (2) an alkaline-earth metal ion conductivity in the case where the positive-electrode active material contains the alkaline-earth metal chloride, and/or a quaternary alkylammonium ion conductivity in the case where the positive-electrode active material contains the quaternary alkylammonium chloride.

### Claim 2 (depends on 1)

The electrochemical energy storing device of claim 1, wherein, in a charged state, the positive electrode has Cl2 adsorbed thereto, the Cl2 having been generated from the alkali metal chloride, alkaline-earth metal chloride, or quaternary alkylammonium chloride.

### Claim 3 (depends on 1)

The electrochemical energy storing device of claim 1, wherein the alkali metal chloride is LiCl.

### Claim 4 (depends on 1)

The electrochemical energy storing device of claim 1, wherein the alkaline-earth metal chloride is MgCl2.

### Claim 5 (depends on 1)

The electrochemical energy storing device of claim 1, wherein the quaternary alkylammonium chloride is (C4H9)4NCl.

### Claim 6 (depends on 1)

The electrochemical energy storing device of claim 1, wherein cations in the ionic liquid are (C2H5)2(CH3)(CH3OCH2CH2)N+.

### Claim 7 (depends on 1)

The electrochemical energy storing device of claim 1, wherein anions in the ionic liquid are BF4−.

### Claim 8 (depends on 1)

The electrochemical energy storing device of claim 1, wherein anions in the ionic liquid are (CF3SO2)2N−.

### Claim 9 (depends on 2)

The electrochemical energy storing device of claim 2, wherein the positive electrode contains a carbon material, and, in the charged state, the chlorine is adsorbed to the carbon material.

### Claim 10 (depends on 9)

The electrochemical energy storing device of claim 9, wherein the carbon material is acetylene black.

### Claim 11 (depends on 9)

The electrochemical energy storing device of claim 9, wherein the carbon material is activated carbon.

### Claim 12 (depends on 1)

The electrochemical energy storing device of claim 1, wherein an amount of the ionic liquid is 50% or more of the nonaqueous electrolyte solution.

### Claim 13 (depends on 1)

The electrochemical energy storing device of claim 1, wherein the nonaqueous electrolyte solution further contains an organic solvent other than the ionic liquid, and an content of the is organic solvent is equimolar to or less than the ionic liquid.

### Claim 14 (depends on 1)

The electrochemical energy storing device of claim 1, wherein the solvent consists of the ionic liquid.