Aqueous binder and preparation method thereof, glued diaphragm and preparation method thereof, and lithium ion secondary battery

A technology for water-based binders and diaphragms, applied in the fields of water-based binders, preparation methods, preparations, glue-coated diaphragms, and lithium-ion secondary batteries. Effect

Active Publication Date: 2021-01-15
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of hole plugging and Coulombic efficiency reduction after hot pressing of glue-coated diaphragms

Method used

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  • Aqueous binder and preparation method thereof, glued diaphragm and preparation method thereof, and lithium ion secondary battery
  • Aqueous binder and preparation method thereof, glued diaphragm and preparation method thereof, and lithium ion secondary battery
  • Aqueous binder and preparation method thereof, glued diaphragm and preparation method thereof, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072]This embodiment provides a water-based adhesive. The raw materials of the water-based adhesive include point-bonded polymers, surface-bonded polymers, and polymer lithium salts. The point-bonding polymer is a granular polymer with a D50 particle size of 0.5um; the surface-bonding polymer is polyacrylic acid with a molecular mass of 200,000 and a glass transition temperature of 70°C; the polymer lithium The salt is lithium carboxymethyl cellulose;

[0073]The point-bonding polymer accounts for 75% of the total dry basis mass of the water-based binder raw materials, and the surface-bonding polymer accounts for 20% of the total dry basis mass of the water-based binder raw materials; the polymer lithium salt accounts for the total dry mass of the water-based binder raw materials. 5% of the base mass.

[0074]This embodiment also provides a method for preparing the water-based adhesive, including:

[0075](1) Prepare the first glue solution and the second glue solution of the surface-bondin...

Embodiment 2

[0083]This embodiment provides a water-based adhesive. The raw materials of the water-based adhesive include point-bonded polymers, surface-bonded polymers, and polymer lithium salts. The point-bonding polymer is a granular polymer with a D50 particle size of 1.5um; the surface-bonding polymer is polyacrylamide with a molecular mass of 1 million and a glass transition temperature of 100°C; the polymer The lithium salt is a lithium polyacrylate;

[0084]The point-bonding polymer accounts for 85% of the total dry-based mass of the water-based binder raw materials, and the surface-bonding polymer accounts for 13% of the total dry-based mass of the water-based binder raw materials. 2% of the base mass.

[0085]This embodiment also provides a method for preparing the water-based adhesive, including:

[0086](1) Prepare the first glue solution and the second glue solution of the surface-bonding polymer and polymer lithium salt respectively;

[0087](2) Stir the first glue solution, revolution 15r / min...

Embodiment 3

[0094]This embodiment provides a water-based adhesive. The raw materials of the water-based adhesive include point-bonded polymers, surface-bonded polymers, and polymer lithium salts. The point-bonding polymer is a granular polymer with a D50 particle size of 3um; the surface-bonding polymer is a polyamide with a molecular mass of 500,000 and a glass transition temperature of 120°C; the polymer lithium salt Lithium carboxyethyl cellulose;

[0095]Point-bonding polymer accounts for 92% of the total dry basis mass of water-based binder raw materials, and surface-bonding polymer accounts for 7% of the total dry-based mass of water-based binder raw materials; polymer lithium salt accounts for the total dry mass of the water-based binder 1% of the base mass.

[0096]This embodiment also provides a method for preparing the water-based adhesive, including:

[0097](1) Prepare the first glue solution and the second glue solution of the surface-bonding polymer and polymer lithium salt respectively;

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Abstract

The invention discloses a water-based binder and a preparation method thereof, a glued diaphragm and a preparation method thereof, and a lithium ion secondary battery. The water-based binder comprisesthe following raw materials: a point-bonded polymer, a surface-bonded polymer and a polymer lithium salt, wherein the point-bonded polymer is a granular polymer; and the surface-bonded polymer is a water-soluble polymer, and has a molecular mass of 100,000-1,000,000 and a glass-transition temperature of higher than 60 DEG C. The problems of hole blockage, coulombic efficiency reduction and the like after hot pressing of the glued diaphragm are solved.

Description

Technical field[0001]The invention relates to the technical field of new energy, and relates to an aqueous binder, a preparation method, a glue-coated diaphragm, a preparation method and a lithium ion secondary battery.Background technique[0002]The separator is one of the four main materials of lithium-ion batteries. It plays a role in isolating electrons and conducting lithium ions in lithium-ion batteries to prevent short-circuiting of the positive and negative electrodes of the battery. The diaphragm has a great influence on the cell interface and the internal resistance of the cell, and further affects the battery capacity, safety performance, charge and discharge density, and cycle performance.[0003]The rubberized diaphragm can relieve the wrinkles of the pole pieces caused during the charging and discharging process of the wound structure cell, so that the cell interface maintains a good interface. The glue-coated diaphragm can stick the laminated structure cell firmly to avoi...

Claims

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Application Information

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IPC IPC(8): C09J127/16C09J127/18C09J127/20C09J133/02C09J133/26C09J177/00C09J133/20C09J11/08C09J7/30H01M10/0525
CPCC09J127/16C09J127/18C09J127/20C09J11/08C09J7/30H01M10/0525C08L2205/03C08L2205/035C08L2203/20C09J2427/00C09J2203/33C08L27/18C08L27/20C08L33/02C08L1/286C08L33/26C08L77/00C08L33/20C08L39/06Y02E60/10
Inventor 朱忠泗李倩伟何巍刘金成顾岚冰熊后高
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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