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A kind of preparation method of water-based super nano lithium iron phosphate battery negative plate

A lithium iron phosphate battery and negative plate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low initial discharge capacity, low retention rate of high-power charge and discharge capacity, etc., and achieve excellent low temperature resistance performance and retention rate. High, energy-dense effects

Active Publication Date: 2020-09-15
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low high-power charge-discharge capacity retention rate and low initial discharge capacity of lithium battery negative electrode materials in the prior art, a material that can effectively improve the high-power charge-discharge capacity and initial discharge capacity of the lithium battery negative plate is provided. A kind of preparation method of negative plate of water system super nano lithium iron phosphate battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a water-based super nanometer lithium iron phosphate battery negative plate, the preparation method comprising the following steps:

[0038] (1) Preparation of artificial graphite:

[0039] (1.1) Preparation of polymer emulsion: Add 20 parts of polystyrene, 20 parts of hydroxyethyl acrylate, and 3 parts of vinyltriethoxysilane into the reactor, then add 40 parts of deionized water and polyoxyethylene sorbitol 2 parts of anhydride, after stirring evenly, 0.3 part of potassium persulfate was added thereto, and after emulsion polymerization for 2 hours, a polymer emulsion was obtained;

[0040] (1.2) Compounding: Take 50 parts of polymer emulsion, add 30 parts of novolac epoxy resin to it, stir well, then add 30 parts of hard carbon, stir well, mold into a sphere with a diameter of 0.5cm at 60°C Under, obtain the precursor after drying for 10 hours;

[0041] (1.3) Graphitization: Gradiently raise the temperature of the precursor obtained in step (2...

Embodiment 2

[0046] A method for preparing a water-based super nanometer lithium iron phosphate battery negative plate, the preparation method comprising the following steps:

[0047] (1) Preparation of artificial graphite:

[0048] (1.1) Preparation of polymer emulsion: Add 35 parts of polystyrene, 35 parts of hydroxyethyl acrylate, 10 parts of vinyltriethoxysilane into the reactor, then add 50 parts of deionized water and polyoxyethylene sorbitol 5 parts of anhydride, after stirring evenly, 3 parts of potassium persulfate were added thereto, and after emulsion polymerization for 5 hours, a polymer emulsion was obtained;

[0049] (1.2) Compounding: Take 50 parts of polymer emulsion, add 20 parts of novolac epoxy resin to it, stir well, then add 40 parts of hard carbon, stir well, mold into a sphere with a diameter of 3cm at 85°C , to obtain a precursor after drying for 18 hours;

[0050] (1.3) Graphitization: Gradiently raise the temperature of the precursor obtained in step (2) under a...

Embodiment 3

[0055] A method for preparing a water-based super nanometer lithium iron phosphate battery negative plate, the preparation method comprising the following steps:

[0056] (1) Preparation of artificial graphite:

[0057] (1.1) Preparation of polymer emulsion: Add 25 parts of polystyrene, 30 parts of hydroxyethyl acrylate, 5 parts of vinyltriethoxysilane into the reactor, then add 45 parts of deionized water and polyoxyethylene sorbitol 3 parts of anhydride, after stirring evenly, 2 parts of potassium persulfate were added thereto, and after emulsion polymerization for 3.5 hours, a polymer emulsion was obtained;

[0058] (1.2) Compounding: Take 50 parts of polymer emulsion, add 25 parts of novolac epoxy resin to it, stir well, then add 38 parts of hard carbon, stir well, mold into a sphere with a diameter of 1.5cm at 70°C Next, the precursor was obtained after drying for 16 hours;

[0059] (1.3) Graphitization: Gradiently raise the temperature of the precursor obtained in step...

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Abstract

The invention relates to the field of lithium battery preparation, in particular to a preparation method of an aqueous super nano lithium iron phosphate battery negative plate. The preparation methodcomprises the following steps: (1) preparation of artificial graphite: preparing polymer emulsion, mixing the polymer emulsion with phenol formaldehyde epoxy resin and hard carbon, and obtaining artificial graphite through graphitization at high temperature; (2) preparation of negative electrode slurry: grinding and sifting the artificial graphite, mixing the artificial graphite with carboxy methyl cellulose, aqueous binder, de-ionized water and conductive agent, and carrying out homogenization to obtain negative electrode slurry; and (3) preparation of a negative plate: coating the surface ofan aluminum foil with the negative electrode slurry, and obtaining a negative plate after slitting and baking. The problem that the lithium battery negative material in the prior art has low high-power charge-discharge capacity retention rate and low first discharge capacity is solved. The aqueous super nano lithium iron phosphate battery negative plate of the invention has the advantages of highhigh-power charge-discharge capacity retention rate, high first discharge capacity, high energy density, excellent low temperature resistance, better safety performance and lower resistance.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a method for preparing a water-based super nanometer lithium iron phosphate battery negative plate. Background technique [0002] A lithium-ion battery is a secondary battery system in which two different lithium intercalation compounds that can reversibly insert and extract lithium ions are used as the positive electrode and the negative electrode of the battery, respectively. When charging, lithium ions are extracted from the lattice of the positive electrode material, and inserted into the lattice of the negative electrode material after passing through the electrolyte, making the negative electrode rich in lithium and the positive electrode poor in lithium; during discharge, lithium ions are extracted from the lattice of the negative electrode material, and after The electrolyte is then inserted into the lattice of the positive electrode material, making the positiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/10
Inventor 杜小红李凡群赵星星苏文俊贺勇石先兴
Owner WANXIANG 123 CO LTD
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