# US 2022/0285104 A1 · Electrochemical device and method for manufacturing same

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- Number: US 2022/0285104 A1
- Document ID: US20220285104A1
- Status: Published application
- Kind: A1
- Application number: 17/553,035
- Filed: 2021-12-16
- Published: 2022-09-08
- Earliest claimed: 2015-11-27
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Susumu NOMOTO; Yasuyuki ITO; Nao MATSUMURA; Hiroki HAYASHI; Makoto AKUTSU; Tougo ENDOU
- Web page: https://patentgrep.com/patent/US20220285104A1

## CPC

- H01G 11/50: specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
- H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
- H01G 11/48: Conductive polymers
- H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34)
- H01M 4/137: Electrodes based on electro-active polymers
- H01M 4/1399: of electrodes based on electro-active polymers
- H01M 4/60: of organic compounds
- H01M 4/606: {containing aromatic main chain polymers}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0566: Liquid materials
- H01M 10/0569: characterised by the solvents
- H01M 10/058: Construction or manufacture
- H01G 11/60: characterised by the solvent
- H01G 11/62: characterised by the solute, e.g. salts, anions or cations therein
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0037: Mixture of solvents
- Y02E 60/13: Energy storage using capacitors
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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)
- 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

## Abstract

An electrochemical device includes a positive electrode having a positive electrode material layer containing a conductive polymer doped with a first anion and a second anion, a negative electrode having a negative electrode material layer storing and releasing lithium ions, and a nonaqueous electrolytic solution having lithium ionic conductivity. The second anion is more easily dedoped from the conductive polymer than the first anion. At an end period of charge of the electrochemical device, a number of moles M1 of the first anion and a number of moles M2 of the second anion respectively doped in the conductive polymer satisfy a relationship of M1<M2. At an end period of discharge of the electrochemical device, a number of moles M3 of the first anion and a number of moles M4 of the second anion respectively doped in the conductive polymer satisfy a relationship of M3>M4.

## Claims

### Claim 1

A method for manufacturing an electrochemical device including a positive electrode having a positive electrode material layer containing a conductive polymer doped with a first anion and a second anion, a negative electrode having a negative electrode material layer storing and releasing lithium ions, and a nonaqueous electrolytic solution having lithium ionic conductivity, the electrochemical device being charged and discharged by making the second anion be doped in or dedoped from the conductive polymer, the method comprising:
a step of forming the positive electrode;
a step of forming the negative electrode; and
a step of immersing the positive electrode and the negative electrode in the nonaqueous electrolytic solution, wherein:
the step of forming a positive electrode includes:
a step of forming the conductive polymer doped with the first anion by polymerizing a polymerizable compound that is a raw material of the conductive polymer in a first solution containing the first anion; and
a step of doping the second anion in the conductive polymer doped with the first anion in a second solution containing the second anion that is more easily dedoped from the conductive polymer than the first anion, and
the step of forming the conductive polymer doped with the first anion includes a step of removing part of the first anion from the conductive polymer doped with the first anion prior to the step of doping the second anion in the conductive polymer so that a number of moles M1 of the first anion and a number of moles M2 of the second anion respectively doped in the conductive polymer satisfy a relationship of M1<M2 at an end period of charge of the electrochemical device, and a number of moles M3 of the first anion and a number of moles M4 of the second anion respectively doped in the conductive polymer satisfy a relationship of M3>M4 at an end period of discharge of the electrochemical device.

### Claim 2

A method for manufacturing an electrochemical device including a positive electrode having a positive electrode material layer containing a conductive polymer doped with a first anion and a second anion, a negative electrode having a negative electrode material layer storing and releasing lithium ions, and a nonaqueous electrolytic solution having lithium ionic conductivity, the electrochemical device being charged and discharged by making the second anion be doped in or dedoped from the conductive polymer, the method comprising:
a step of forming the positive electrode;
a step of forming the negative electrode; and
a step of immersing the positive electrode and the negative electrode in a nonaqueous electrolytic solution,
wherein:
the step of forming a positive electrode includes a step of forming the conductive polymer doped with the first anion by polymerizing a polymerizable compound that is a raw material of the conductive polymer in a first solution containing a first anion,
the nonaqueous electrolytic solution contains a second anion that is more easily dedoped from the conductive polymer than the first anion, and
the step of immersing the positive electrode and the negative electrode in the nonaqueous electrolytic solution includes a step of doping the second anion in the conductive polymer doped with the first anion in the nonaqueous electrolytic solution, and
the step of forming the conductive polymer doped with the first anion includes a step of removing part of the first anion from the conductive polymer doped with the first anion prior to the step of doping the second anion in the conductive polymer so that a number of moles M1 of the first anion and a number of moles M2 of the second anion respectively doped in the conductive polymer satisfy a relationship of M1<M2 at an end period of charge of the electrochemical device, and a number of moles M3 of the first anion and a number of moles M4 of the second anion respectively doped in the conductive polymer satisfy a relationship of M3>M4 at an end period of discharge of the electrochemical device.

### Claim 3 (depends on 1)

The method for manufacturing an electrochemical device according to claim 1, wherein the step of removing part of the first anion from the conductive polymer is executed by reducing the conductive polymer by a reverse current.

### Claim 4 (depends on 2)

The method for manufacturing an electrochemical device according to claim 2, wherein the step of removing part of the first anion from the conductive polymer is executed by reducing the conductive polymer by a reverse current.

### Claim 5 (depends on 1)

The method for manufacturing an electrochemical device according to claim 1, wherein the conductive polymer is at least one selected from the group consisting of polypyrrole, polythiophene, polyfuran, polyaniline, polythiophene vinylene, polypyridine and derivatives thereof.

### Claim 6 (depends on 2)

The method for manufacturing an electrochemical device according to claim 2, wherein the conductive polymer is at least one selected from the group consisting of polypyrrole, polythiophene, polyfuran, polyaniline, polythiophene vinylene, polypyridine and derivatives thereof.

### Claim 7 (depends on 1)

The method for manufacturing an electrochemical device according to claim 1, wherein:
the first anion is an oxo acid anion not containing a halogen atom, and
the second anion is at least one selected from the group consisting of tetrafluoroborate anion, hexafluorophosphate anion, perchloric acid anion and bis(fluorosulfonyl)imide anion.

### Claim 8 (depends on 2)

The method for manufacturing an electrochemical device according to claim 2, wherein:
the first anion is an oxo acid anion not containing a halogen atom, and
the second anion is at least one selected from the group consisting of tetrafluoroborate anion, hexafluorophosphate anion, perchloric acid anion and bis(fluorosulfonyl)imide anion.