# US 12,191,523 B2 · Polymer-modified porous material, membrane electrode, secondary battery, and electric device

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- Number: US 12,191,523 B2
- Document ID: US12191523B2
- Status: Granted
- Kind: B2
- Application number: 18/750,818
- Filed: 2024-06-21
- Published: 2024-10-17
- Granted: 2025-01-07
- Earliest claimed: 2022-07-05
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology (Hong Kong) Limited
- Inventors: Jianghui Lin; Yanjie Zhao; Xing Li; Haizu Jin
- Web page: https://patentgrep.com/patent/US12191523B2

## CPC

- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- C08F 292/00: Macromolecular compounds obtained by polymerising monomers on to inorganic materials
- C09C 1/42: Clays
- C09C 3/10: Treatment with macromolecular organic compounds {(C09C3/006 takes precedence)}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- 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 50/443: Particulate material
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M 50/491: Porosity
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- C01P 2006/40: Electric properties
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A polymer-modified porous material, a membrane electrode, and applications thereof are disclosed. The polymer-modified porous material includes a porous material and a plurality of surface groups attached to the porous material; each of the surface groups includes a linking group and an adhesive group that are attached in sequence; the linking group has a structure represented by a structural unit I, wherein represents that O is linked to the porous material; the number of the structural units I in each of the surface groups is independent from each other; the total number n of moles of the structural units I in the polymer-modified porous material is 1,000-10,000; and the total number m of moles of the adhesive groups is 10-1,000, and n/m=10-1,000. The problem of serious self-discharge of existing membrane electrodes is alleviated.

## Claims

### Claim 1

A polymer-modified porous material, wherein the polymer-modified porous material comprises a porous material and a plurality of surface groups attached to the porous material, each of the plurality of surface groups comprising a linking group and an adhesive group that are attached in sequence, the linking group having a structure represented by a structural unit I,
wherein represents that O is linked to the porous material; the number of the structural units I in each of the plurality of surface groups is independent from each other; and the total number n of moles of the structural units I in the polymer-modified porous material ranges from 1,000 to 10,000;
a monomer forming the adhesive group is selected from any one or more of the group consisting of acrylic acid, ethylene, vinyl alcohol, ethylene imine, propylene, acrylonitrile, vinylidene fluoride, and tetrafluoroethylene; the number of the adhesive groups in each of the plurality of surface groups is independent from each other; the total number m of moles of the adhesive groups in the polymer-modified porous material ranges from 10 to 1,000, and n/m=10-1,000.

### Claim 2 (depends on 1)

The polymer-modified porous material according to claim 1, wherein m=50-500.

### Claim 3 (depends on 1)

The polymer-modified porous material according to claim 1, wherein the porous material is selected from any one or more of the group consisting of diatomite, zeolite, montmorillonite, kaolin, and a metal-organic framework material.

### Claim 4 (depends on 1)

The polymer-modified porous material according to claim 1, wherein the polymer-modified porous material has a DV50 of 2 μm-15 μm.

### Claim 5 (depends on 1)

A membrane electrode, comprising a pole plate and a separator, the pole plate comprising a current collector and an active material layer disposed on at least one surface of the current collector, the separator being disposed on a surface of the active material layer facing away from the current collector, wherein the separator comprises the polymer-modified porous material according to claim 1.

### Claim 6 (depends on 5)

The membrane electrode according to claim 5, wherein the separator has a thickness ranging from 2 μm to 80 μm.

### Claim 7 (depends on 5)

The membrane electrode according to claim 5, wherein the pole plate is a negative pole plate.

### Claim 8 (depends on 5)

The membrane electrode according to claim 5, wherein a peel strength between the separator and the active material layer ranges from 5.5 N/m to 15 N/m.

### Claim 9 (depends on 5)

A secondary battery, comprising a membrane electrode, wherein the membrane electrode is the membrane electrode according to claim 5.

### Claim 10 (depends on 9)

An electrical device, comprising a secondary battery or a battery module or a battery pack comprising the secondary battery, wherein the secondary battery is the secondary battery according to claim 9.

### Claim 11 (depends on 1)

The polymer-modified porous material according to claim 1, wherein n=5,000-10,000.

### Claim 12 (depends on 1)

The polymer-modified porous material according to claim 1, wherein n/m=50-500.

### Claim 13 (depends on 1)

The polymer-modified porous material according to claim 1, wherein m=50-500, n=5,000-10,000 and n/m=10-1,000.

### Claim 14 (depends on 1)

The polymer-modified porous material according to claim 1 wherein n=1,000-10,000, m=10-1,000 and n/m=50-500.

### Claim 15 (depends on 1)

The polymer-modified porous material according to claim 1, wherein the polymer-modified porous material has a BET specific surface area of 10 g/m2 to 80 g/m2.

### Claim 16 (depends on 5)

The membrane electrode according to claim 5, wherein the separator has a thickness ranging from 5 μm to 50 μm.

### Claim 17 (depends on 5)

The membrane electrode according to claim 5, wherein a peel strength between the separator and the active material layer ranges from 6 N/m to 14 N/m.