Polyborate binder as well as preparation method and application thereof

A technology of polyborate and binder, which is applied in the direction of structural parts, active material electrodes, electrical components, etc., can solve the problems of low bonding strength, poor conductivity and high preparation cost of binders, and achieve strong bonding Intensity, the effect of great application prospects

Inactive Publication Date: 2021-11-12
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a polyborate adhesive and its preparation method and

Method used

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  • Polyborate binder as well as preparation method and application thereof
  • Polyborate binder as well as preparation method and application thereof
  • Polyborate binder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Synthesis of polyborate binder: Add 22.70 grams of cyclodextrin and 4.228 grams of lithium tetraborate to 200 grams of water, stir and react at room temperature for 6 hours to obtain a colorless solution, which is diluted to a solid content of 2%. The solution.

[0036] 2. Battery production: Weigh 0.225 g of carbon-coated SiO negative electrode material, add 0.045 g of Ketjen black conductive agent, mix evenly in an agate mortar, add 1.50 g of the above-mentioned polyborate binder solution, and grind it into a uniform The slurry is scraped onto the copper foil, dried at 80 degrees, punched into a pole piece with a diameter of 12mm, dried overnight at 70 degrees under vacuum, and then assembled into a button battery in a glove box, wherein the negative electrode is a metal lithium sheet, and the electrolyte is 1mol / L LiPF6 solution (the solvent is ethylene carbonate and diethyl carbonate with a volume ratio of 1:1, and 2% vinylene carbonate is added as a film-forming...

Embodiment 2

[0039] 1. Synthesis of binder: add 15.00 g of tartaric acid and 0.4975 g of metaboric acid in 200 g of water, stir and react at room temperature for 6 hours to obtain a colorless solution, which is diluted to a solution with a solid content of 2%.

[0040]2. Battery production: Weigh 0.225 g of carbon-coated SiO negative electrode material, add 0.045 g of Ketjen black conductive agent, mix evenly in an agate mortar, add 1.50 g of the above binder solution, grind into a uniform slurry, scrape Coated on copper foil, dried at 80 degrees, punched into a pole piece with a diameter of 12mm, dried overnight at 70 degrees in vacuum, assembled into a button battery in a glove box, in which the negative electrode is a lithium metal sheet, and the electrolyte is 1mol / L LiPF6 solution (the solvent is ethylene carbonate and diethyl carbonate with a volume ratio of 1:1, and 2% vinylene carbonate is added as a film-forming agent), and the diaphragm is cellgard2500.

[0041] 3. Performance te...

Embodiment 3

[0043] 1. Synthesis of binder: 18.20 grams of sorbitol and 0.8456 grams of lithium tetraborate were added to 200 grams of water, stirred and reacted at room temperature for 6 hours to obtain a colorless solution, which was diluted to a solution with a solid content of 2%.

[0044] 2. Battery production: Weigh 0.225 g of carbon-coated SiO negative electrode material, add 0.045 g of Ketjen black conductive agent, mix evenly in an agate mortar, add 1.50 g of the above binder solution, grind into a uniform slurry, scrape Coated on copper foil, dried at 80 degrees, punched into a pole piece with a diameter of 12mm, dried overnight at 70 degrees in vacuum, assembled into a button battery in a glove box, in which the negative electrode is a lithium metal sheet, and the electrolyte is 1mol / L LiPF6 solution (the solvent is ethylene carbonate and diethyl carbonate with a volume ratio of 1:1, and 2% vinylene carbonate is added as a film-forming agent), and the diaphragm is cellgard2500. ...

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PUM

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Abstract

The invention discloses a polyborate binder and a preparation method and application thereof. The preparation method selects an organic ligand which comprises one or more functional groups of hydroxyl, carboxyl and sulfo, and comprises the steps of adding the organic ligand and a boron ion compound into a water solvent, conducting mixing, and conducting reacting to obtain the polyborate binder. The water-soluble inherent microporous conductive polyborate binder synthesized by adopting relatively cheap raw materials has higher bonding strength and lithium ion conductivity, has an excellent effect when being used for a silicon-based negative electrode material, and also has very obvious advantages even when being used for traditional electrode materials such as lithium iron phosphate, lithium manganate and graphite. Moreover, the binder adopts cheap commercial raw materials, is synthesized through a simple process capable of realizing mass production, and has a huge application prospect.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a polyborate binder and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in smartphones, notebook computers and electric vehicles due to their excellent performance such as high energy density, long life and high voltage. With the thinner, lighter, multifunctional, larger screens of smartphones and laptops, and the development of electric vehicles, the energy density of batteries is required to be higher and higher. [0003] Lithium-ion batteries are usually manufactured using the following process: powdered active materials, conductive agents and binders are mixed in a certain proportion to make a slurry, coated on a current collector such as aluminum foil or copper foil to form a pole piece, and then rolled A more dense pole piece is formed, and the positive and negative pole pieces ar...

Claims

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Application Information

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IPC IPC(8): C08G79/08H01M4/62H01M10/0525
CPCC08G79/08H01M4/622H01M10/0525H01M2004/027Y02E60/10
Inventor 曾绍忠韩培刚
Owner SHENZHEN TECH UNIV
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