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Aqueous solution type lithium iron phosphate positive electrode adhesive and preparation method and application thereof

A technology of lithium iron phosphate and aqueous solution, which is applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of poor stability, achieve good thermal stability, easy preparation, and simple formula

Pending Publication Date: 2021-03-09
湖南高瑞电源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent does not specify whether the binder uses a solution system or an emulsion system, and similar to the aforementioned patent, the binder also uses a blend system, and its stability may be poor

Method used

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  • Aqueous solution type lithium iron phosphate positive electrode adhesive and preparation method and application thereof
  • Aqueous solution type lithium iron phosphate positive electrode adhesive and preparation method and application thereof

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preparation example Construction

[0061] The application provides a method for preparing an aqueous solution type lithium iron phosphate positive electrode binder, comprising the following steps:

[0062] S101. Put the low-level unsaturated carboxylic acid, the acrylamide and its derivatives, the water-soluble acrylate, and the initiator into the reaction container, and add 300-320 parts of deionized water, and stir until each The material is completely dissolved; the weight of the initiator accounts for 50% to 75% of the total amount of the initiator in the formula;

[0063] S102. Keep stirring, raise the reaction temperature to 55-75°C, and react for 2-6 hours;

[0064] S103. Keep stirring and the reaction temperature, put the (meth)acrylate phosphate and the remaining initiator into the reaction container, and add the deionized water until the theoretical solid content of the reaction solution reaches a preset value , continue to react for 1.5 ~ 4h;

[0065] S104, keep stirring, stop heating, after the te...

preparation Embodiment 1

[0077] Drop into 2-acrylamide-2-methylpropanesulfonic acid 4g, acrylic acid 15g, acrylamide 6g, hydroxyethyl acrylate 12g, ammonium persulfate 0.15g and 300g of deionized water, fully stirred until each material is completely dissolved. Keep stirring, heat up to 60°C, and keep the reaction for 4h. Add 6 g of 2-methyl-2-acrylic acid-2-hydroxyethyl phosphate, 0.07 g of ammonium persulfate and 54 g of deionized water, continue the heat preservation reaction for 2 hours, and stop heating. After the temperature in the three-neck bottle drops to normal temperature, add metered lithium hydroxide, control the pH value of the product to 6-8, and collect the material.

[0078] The product is a light yellow transparent viscous aqueous solution with a viscosity of about 20000cp (25°C). Take a small amount of adhesive and dry it in an oven to obtain a sheet with a length and width of about 10 mm and a thickness of about 3 mm. After immersing the thin slice in the electrolyte and keeping...

preparation Embodiment 2

[0080] Compared with Preparation Example 1, 15 g of acrylic acid was replaced by 12 g of acrylic acid and 3 g of maleic acid, 6 g of acrylamide was replaced by 5 g of acrylamide and 1 g of N-methylol acrylamide, and all hydroxyethyl acrylate was replaced by 3-hydroxyl acrylic acid Propyl ester, all the other are with embodiment 1.

[0081] The product is a light yellow transparent viscous aqueous solution with a viscosity of about 30000cp (25°C). Take a small amount of adhesive and dry it in an oven to obtain a sheet with a length and width of about 10 mm and a thickness of about 3 mm. After immersing the thin slice in the electrolyte and keeping it warm at 60° C. for 72 hours, the volume of the thin slice increases by less than 5%.

[0082] The application provides an application of an aqueous solution-type lithium iron phosphate positive electrode binder, including using the aqueous solution-type lithium iron phosphate positive electrode binder to prepare electrical materia...

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Abstract

The invention discloses an aqueous solution type lithium iron phosphate positive electrode adhesive, and a preparation method and application thereof. The aqueous solution type lithium iron phosphatepositive electrode adhesive is an aqueous solution, and the solid content is 3-15%; at 25 DEG C, the viscosity of the aqueous solution type lithium iron phosphate positive electrode binder is 5000-100000 cp, and the pH value is 6-8; the aqueous solution type lithium iron phosphate positive electrode adhesive comprises the following components in parts by mass: 10-20 parts of low-grade unsaturatedcarboxylic acid, 8-15 parts of acrylamide and derivatives thereof, 5-20 parts of water-soluble acrylate, 5-10 parts of (methyl) acrylate phosphate ester, and 0.1-0.4 part of initiator. Compared with the prior art, a single-component aqueous solution system is adopted, compared with a multi-component blending solution, the storage and use stability is better, the formula is simpler, and preparationis easy and convenient; in the aspect of components, acrylic acid, acrylate, acrylamide and other monomers are adopted for copolymerization, and the product has better thermal stability than polyvinyl alcohol, CMC and other water-soluble polymers.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, and more specifically, relates to an aqueous solution type lithium iron phosphate positive electrode binder, a preparation method and an application thereof. Background technique [0002] Lithium iron phosphate is a commonly used cathode material for lithium-ion batteries. However, lithium iron phosphate has relatively poor electrical conductivity and relatively low energy density. Therefore, the market share of lithium batteries prepared using lithium iron phosphate cathodes, especially The market share of power batteries has long been suppressed by lithium batteries made of ternary cathode materials. However, compared with ternary cathode materials, the advantage of lithium iron phosphate lies in its higher safety. In recent years, news about safety accidents of lithium-ion batteries, especially lithium-ion power batteries, has frequently appeared in the newspapers, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/136H01M10/0525C08F220/06C08F220/56C08F230/02C08F222/02C08F220/58C08F220/28
CPCH01M4/622H01M4/136H01M10/0525C08F220/06C08F220/281H01M2004/028C08F220/56C08F220/585C08F230/02C08F222/02C08F220/58Y02E60/10
Inventor 刘海明席柳江向金林
Owner 湖南高瑞电源材料有限公司
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