# US 12,183,926 B2 · Lithium secondary battery polymer material and manufacturing method therefor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,183,926 B2
- Document ID: US12183926B2
- Status: Granted
- Kind: B2
- Application number: 16/643,367
- Filed: 2018-07-12
- Published: 2020-11-05
- Granted: 2024-12-31
- Earliest claimed: 2017-09-28
- Assignees: LG Energy Solution, Ltd.; Seoul National University R&Db Foundation
- Applicants: LG Chem, Ltd.; Seoul National University R&Db Foundation
- Inventors: Jonghyun Chae; Jong-Chan Lee; Yeonju Lee; Daeil Kim; Lucia Kim; Jehoon Lee; Na Kyung Kim; Daun Jeong
- Web page: https://patentgrep.com/patent/US12183926B2

## CPC

- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/608: {containing heterocyclic rings}
- C08G 61/12: Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08L 65/00: Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08L7/00 - C08L57/00, C08L61/00 take precedence); Compositions of derivatives of such polymers
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/622: {being polymers}
- H01M 10/04: Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence)
- 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 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0065: Solid electrolytes
- 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
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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

A polymer material for a lithium secondary battery having ionic conductivity and electronic conductivity at the same time, and a method for preparing the same. The polymer material includes a polythiophene-based polymer and a conductive polymer, and the polymer material may be formed by forming a polythiophene-based polymer, forming a conductive polymer, and heat-treating the polythiophene-based polymer and the conductive polymer.

## Claims

### Claim 1

An all-solid-state lithium secondary battery comprising an electrode assembly consisting of:
a positive electrode, a solid electrolyte, and a negative electrode, which are sequentially stacked;
wherein the solid electrolyte comprises:
a blend-type polymer formed by blending of:
(i) a polythiophene-based polymer represented by the following Formula 1:
wherein n is 70 to 280, PEG is polyethylene glycol, and when a number of ethylene oxide units of PEG is m, m is 4 to 15; and
(ii) a conductive polymer,
wherein the conductive polymer comprises poly-(3,4-ethylenedioxythiophene): poly(styrenesulfonate)(PEDOT: PSS),
wherein the polythiophene-based polymer and the conductive polymer are contained in a weight ratio of 95:5 to 80:20,
wherein the blend-type polymer has an electron conductivity of 10−8 S/cm to 10−2 S/cm, and
wherein the solid electrolyte is a film comprising the blend-type polymer.

### Claim 2 (depends on 1)

The all-solid-state lithium secondary battery according to claim 1, wherein the blend-type polymer has an ionic conductivity of 10−6 S/cm to 10−4 S/cm.

### Claim 3 (depends on 1)

A method for preparing the all-solid-state lithium secondary battery according to claim 1, comprising:
(a) forming a polythiophene-based polymer represented by the following Formula 1;
(b) forming a conductive polymer;
(c) heat treating the polythiophene-based polymer and the conductive polymer to form a blend-type polymer:
wherein n is 70 to 280, PEG is polyethylene glycol, and when a number of ethylene oxide units of PEG is m, m is 4 to 15; and
(d) sequentially stacking the positive electrode, the solid electrolyte, and the negative electrode, wherein the solid electrolyte comprises the blend-type polymer.

### Claim 4 (depends on 3)

The method for preparing the all-solid-state lithium secondary battery according to claim 3, wherein the step (a) comprises,
(a1) adding methanol and sulfuric acid to thiophene acetic acid to form thiophene methyl acetate;
(a2) adding iron chloride to thiophene methyl acetate to form polythiophene methyl acetate;
(a3) adding sodium hydroxide to the polythiophene methyl acetate to form polythiophene sodium acetate;
(a4) adding hydrogen chloride to the polythiophene sodium acetate to form polythiophene acetic acid; and
(a5) adding polyethylene glycol to the polythiophene acetic acid to form poly (3-polyethylene glycol thiophene).

### Claim 5 (depends on 3)

The method for preparing the all-solid-state lithium secondary battery according to claim 3, wherein in the step (c), the heat treatment is performed at 120° C. to 250° C.