# US 2017/0288255 A1 · Flexible secondary battery and method for manufacturing same

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- Number: US 2017/0288255 A1
- Document ID: US20170288255A1
- Status: Published application
- Kind: A1
- Application number: 15/507,298
- Filed: 2015-07-22
- Published: 2017-10-05
- Earliest claimed: 2014-08-30
- Assignees: Jenax Inc.
- Applicants: Jenax Inc.
- Inventors: Chang Hyeon Kim; Eun Jung Shin; Lee Hyun Shin
- Web page: https://patentgrep.com/patent/US20170288255A1

## CPC

- H01M 10/058: Construction or manufacture
- H01M 4/139: Processes of manufacture
- H01M 4/622: {being polymers}
- H01M 4/66: Selection of materials
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/70: characterised by shape or form
- H01M 4/806: {Nonwoven fibrous fabric containing only fibres}
- H01M 10/052: Li-accumulators
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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

Provided are a flexible secondary battery and a method of manufacturing the same. The method includes forming an electrode including a metal fiber-like current collector and an active material combined with the metal fiber-like current collector; and providing a liquid pre-electrolyte that may be either thermally polymerized or crosslinked to the electrode and applying heat thereto, such that the liquid pre-electrolyte is integrated with the electrode and forms a gelated or solidified polymer electrode.

## Claims

### Claim 1

A method of manufacturing a secondary battery, the method comprising:
forming an electrode comprising a metal fiber-like current collector and an active material combined with the metal fiber-like current collector; and
providing a liquid pre-electrolyte that may be either thermally polymerized or crosslinked to the electrode and applying heat thereto, such that the liquid pre-electrolyte is integrated with the electrode and forms a gelated or solidified polymer electrode.

### Claim 2 (depends on 1)

The method of claim 1, wherein the liquid pre-electrolyte comprises an electrolyte salt, an electrolyte solvent, a crosslinkable monomer, and a thermal initiator that gelates or solidifies the monomer via at least one of crosslinking and polymerization by using heat.

### Claim 3 (depends on 2)

The method of claim 2, wherein the crosslinkable monomer comprise a monomer having two or more functional groups or a mixture of a monomer having two or more functional groups and a polar monomer having one functional group.

### Claim 4 (depends on 3)

The method of claim 3, wherein the monomer having two or more functional groups comprises any one selected from the group consisting of trimethylolpropane ethoxylate triacrylate, polyethylene glycol dimethacrylate, polyethyleneglycol diacrylate, divinylbenzene, polyester dimethacrylate, divinylether, trimethylolpropane, trimethylolpropane trimethacrylate, and ethoxylated bisphenol A dimethacrylate, or a mixture of two or more thereof.

### Claim 5 (depends on 3)

The method of claim 3, wherein the polar monomer having one functional group comprises any one selected from the group consisting of methylmethacrylate, ethylmethacrylate, butylmethacrylate, methylacrylate, butylacrylate, ethylene glycol methylether acrylate, ethylene glycol methylether methacrylate, acrylonitrile, vinylacetate, vinylchloride, and vinylfluoride, or a mixture of two or more thereof.

### Claim 6 (depends on 2)

The method of claim 2, wherein the electrolyte solvent comprises cyclic or acyclic amides, amides like acetamides, esters, linear carbonates, cyclic carbonates, or a mixture thereof.

### Claim 7 (depends on 2)

The method of claim 2, wherein the thermal initiator comprises benzoyl peroxide, acetylperoxide, dilauryl peroxide, di-tert-butyl peroxide, t-butyl peroxy-2-ethyl-hexanoate, cumyl hydroperoxide, hydrogen peroxide, 2,2′-azobis(2-cyanobutane), 2,2′-azobis(methylbutyronitrile) AIBN(2,2′-Azobis(iso-butyronitrile)), or AMVN (2,2′-Azobisdimethyl-Valeronitrile).

### Claim 8 (depends on 1)

The method of claim 1, wherein the gelating or solidifying is performed at a temperature of from 30° C. to 100° C.

### Claim 9 (depends on 1)

The method of claim 1, further comprising pressing the electrode in which the polymer electrode is formed.

### Claim 10 (depends on 1)

The method of claim 1, wherein the gelating or solidifying is performed by providing the liquid pre-electrolyte before the electrode is put into a casing.

### Claim 11 (depends on 1)

The method of claim 1, wherein the gelating or solidifying is performed by providing the liquid pre-electrolyte after the electrode is put into a casing.

### Claim 12 (depends on 11)

The method of claim 11, wherein the electrode is either a positive electrode or a negative electrode, and the positive electrode and the negative electrode are put into the casing after a separator is interposed between the positive electrode and the negative electrode.

### Claim 13 (depends on 1)

The method of claim 1, wherein the active material and the liquid pre-electrolyte are mixed with each other and impregnated into the metal fiber-like current collector.

### Claim 14

A secondary battery comprising:
a positive electrode and a negative electrode;
wherein at least one of the positive electrode and the negative electrode comprises:
an electrode assembly comprising a mixture of a metal fiber-like current collector and an active material; and
a gelated or solidified polymer electrolyte integrated with the interior of the metal fiber-like current collector.

### Claim 15 (depends on 14)

The secondary battery of claim 14, wherein the polymer electrolyte is integrated with both the positive electrode and the negative electrode.

### Claim 16 (depends on 14)

The secondary battery of claim 14, wherein the polymer electrolyte comprises a matrix formed as a monomer having two or more functional groups or a mixture of a monomer having two or more functional groups and a polar monomer having one functional group is polymerized via at least one of crosslinking or polymerization, an electrolyte salt, and an electrolyte solvent.

### Claim 17 (depends on 14)

The secondary battery of claim 14, wherein, since at least a portion of the polymer electrolyte surrounds surfaces of a corresponding electrode, a separator is omitted between the positive electrode and the negative electrode.

### Claim 18 (depends on 14)

The secondary battery of claim 14, wherein the metal fiber-like current collector has a non-woven fabric-like structure.