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A kind of water-based binder for positive electrode of lithium ion battery and preparation method thereof

A water-based binder, lithium-ion battery technology, applied in battery electrodes, binder types, ester copolymer binders, etc., can solve the problems of low positive electrode bulk density, low production efficiency, low yield, etc. The effect of good battery cycle performance, improved yield and moderate viscosity

Active Publication Date: 2019-02-15
BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a lithium-ion battery positive electrode water-based binder and a preparation method thereof, which solves the problem of low bulk density of the lithium-ion battery positive electrode in the prior art, brittleness after drying, poor flexibility, and poor finished product. Low efficiency, low production efficiency and other technical problems

Method used

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  • A kind of water-based binder for positive electrode of lithium ion battery and preparation method thereof
  • A kind of water-based binder for positive electrode of lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0031] In this example, sodium acrylamido isopropyl sulfonate, laurate and sodium persulfate are used as amphiphilic reactive emulsifiers, functional monomers with special functional groups that improve the flexibility of polymer chains, and initiators, respectively. The mixture of acrylic acid, acrylamide and butyl acrylate is used as the acrylate monomer, and the ratio of the acrylate monomer, the amphiphilic reactive emulsifier and the functional monomer in the whole preparation process is: 19:0.1:1.

[0032]Specifically prepare the solution of lithium-ion battery cathode water-based binder according to the following steps: by weight, add in the reaction kettle successively: 320 parts of water, 0.4 part of sodium acrylamido isopropyl sulfonate, 25 parts of acrylic acid, 15 parts of propylene Amide, 36 parts of butyl acrylate, and 4 parts of laurate were stirred and blended at 400 rpm. When the temperature rises to 82°C, add sodium persulfate to initiate polymerization, and ...

Embodiment 2

[0035] In the present embodiment, sodium persulfate is still used as the initiator, and the difference is that allyloxy hydroxypropyl sulfonate and veova10 (vinyl tertiary carbonate) are used as amphiphilic reactive emulsifiers and have improved macromolecular chain Flexible functional monomers with special functional groups, using a mixture of acrylic acid, acrylamide, butyl acrylate, ethyl acrylate and itaconic acid as acrylate monomers, wherein itaconic acid and part of acrylic acid start to initiate polymerization after a period of time Add together with some water, the ratio of acrylate monomer, amphiphilic reactive emulsifier and functional monomer in the whole preparation process is: 17:0.25:2.5.

[0036] Concretely prepare the solution of lithium-ion battery cathode water-based binder according to the following steps: by weight, add in the reaction kettle successively: 260 parts of water, 1 part of allyloxy sodium hydroxypropane sulfonate, 10 parts of acrylic acid, 12 p...

Embodiment 3

[0039] The manganese + ternary system was used as the positive electrode electroactive material, and the aqueous binder solution prepared in Example 2 was used to prepare the positive electrode slurry. The ratio of materials in the entire positive electrode slurry is: water-based binder, 2.0%; positive electrode material, 95%; conductive agent S-P, 3%.

[0040] The positive electrode slurry prepared above has a solid content of 70% and a viscosity of 8000 mPa.s. The slurry has good thixotropy. The coating process adopts an 18m drying tunnel, where the temperature of the drying tunnel is set at 90°C-110°C-120°C-100°C-90°C, and the coating speed is 8 m / min. The positive electrode sheet made of the slurry is smooth, free from crimping and cracking, has a high packing density, and has a high yield of the electrode sheet.

[0041] The above-mentioned positive pole piece is matched with lithium manganese oxide (BN-M01) active material to assemble a lithium-ion experimental battery,...

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Abstract

The invention provides a lithium-ion battery positive electrode water-based binder and a preparation method thereof, which solves the problem of low bulk density, brittleness after drying, poor flexibility, low yield and low production efficiency of the lithium-ion battery positive electrode in the prior art and other technical issues. The preparation method of the lithium-ion battery cathode water-based binder provided by the present invention uses water as a dispersion medium, adding acrylate monomers, amphiphilic reactive emulsifiers, functional monomers with special functional groups that improve the flexibility of polymer chains, and The initiator is stirred and mixed, the temperature is raised to initiate polymerization, and the reaction is performed to obtain a water-based binder for the positive electrode of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cathode water-based binder and a preparation method thereof. Background technique [0002] As an emerging industry, new energy projects are in line with the national policy of energy conservation, emission reduction and sustainable development, and are of great help to the adjustment and transformation of industrial structure. As a very important part of the new energy industry, lithium-ion secondary batteries have the advantages of high energy density, long life, small size, light weight, safety and reliability, and no pollution. They have been widely used in electric vehicles, aerospace, Communication equipment and various portable electrical appliances have become the most promising ideal energy source in the 21st century. [0003] Lithium-ion batteries are usually made by mixing and grinding electroactive substances, conductive agents and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C08F220/18C08F220/06C08F220/56C08F220/58C08F216/14C08F222/02H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525C09J133/08C08F220/1804C08F220/585C08F220/56C08F218/10C08F220/06C08F220/1802C08F222/02C08F216/1475C08F220/1812H01M2004/028C08F2/24Y02E60/10C08F220/18C08F220/1808C08F220/1807C08F218/08C08F220/24C08F220/1818C08F220/10C08F220/281C08F220/44C08F2/26C08F4/04C08F4/34
Inventor 白丰瑞李强罗贺斌
Owner BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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