Lithium iron phosphate power battery water-based cathode slurry and method for preparing cathode pole piece

A positive pole piece, lithium iron phosphate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of slurry layering, difficult removal of pole piece moisture, environmental pollution costs, etc., to improve discharge performance and cycle performance , reduce production costs, and solve the effect of water refractory

Active Publication Date: 2015-05-13
HANGZHOU LIAO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the traditional oily system formula polluting the environment and high cost, and to overcome the shortcomings of easy delamination of the slurry prepared by the water-based system and difficult removal of pole piece moisture, and provide a dispersibility and stability Excellent water-based positive electrode slurry and positive electrode sheet preparation method for lithium iron phosphate power battery that removes moisture from positive electrode sheet and significantly improves electrochemical performance

Method used

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  • Lithium iron phosphate power battery water-based cathode slurry and method for preparing cathode pole piece
  • Lithium iron phosphate power battery water-based cathode slurry and method for preparing cathode pole piece
  • Lithium iron phosphate power battery water-based cathode slurry and method for preparing cathode pole piece

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Embodiment 1

[0031] In parts by weight, the formula of an aqueous positive electrode slurry for lithium iron phosphate power batteries is:

[0032] Lithium iron phosphate: 100 parts,

[0033] Water-based adhesive: 15 parts,

[0034] Conductive agent: 3.5 parts,

[0035] Deionized water: 55 parts,

[0036] Anhydrous ethanol: 2 parts.

[0037] The method for preparing the positive pole piece using the positive electrode slurry of the lithium iron phosphate power battery of the present invention has the following steps:

[0038] (1) Mix 15 parts of the water-based adhesive, 3.5 parts of the conductive agent, 27.5 parts of the 50% deionized water, and 2 parts of the absolute ethanol, and ultrasonically disperse for 25 minutes at an ultrasonic frequency of 300HZ;

[0039] (2) Add the mixed solution prepared in (1) to a power mixing mixer, stir for 25 minutes, add 100 parts of the lithium iron phosphate, stir at 1200 rpm for 10 minutes, and transfer the slurry to an ultrasonic device Disperse in medium...

Embodiment 2

[0049] In parts by weight, the formula of an aqueous positive electrode slurry for lithium iron phosphate power batteries is:

[0050] Lithium iron phosphate: 100 parts,

[0051] Water-based adhesive: 20 parts,

[0052] Conductive agent: 4 parts,

[0053] Deionized water: 60 parts,

[0054] Anhydrous ethanol: 3 parts.

[0055] The steps of the method for preparing the positive pole piece using the positive electrode slurry of the lithium iron phosphate power battery of the present invention are the same as those in the first embodiment, except that the water-based binder in step (1) is 20 parts, and the conductive adhesive 4 The ultrasonic frequency in step (1), step (2), step (4), and step (6) is 350HZ.

[0056] The drying step of the coater oven in step (6) is the same as that of the first embodiment, except that the temperature of the coater oven in step A is 130°C, and the belt speed is 7m / min. The vacuum oven in step B The temperature is 180°C, and the volume percentage of a...

Embodiment 3

[0058] In parts by weight, the formula of an aqueous positive electrode slurry for lithium iron phosphate power batteries is:

[0059] Lithium iron phosphate: 100 parts,

[0060] Water-based adhesive: 25 parts,

[0061] Conductive glue: 8 parts,

[0062] Deionized water: 65 parts,

[0063] Anhydrous ethanol: 5 parts.

[0064] The steps of the method for preparing the positive pole piece using the positive electrode slurry of the lithium iron phosphate power battery of the present invention are the same as those in the first embodiment, except that the aqueous binder in step (1) is 25 parts, and the conductive adhesive 8 The ultrasonic frequency in step (1), step (2), step (4), and step (6) is 400HZ.

[0065] The drying step of the coater oven in step (6) is the same as that of the first embodiment, except that the temperature of the coater oven in step A is 120°C, and the belt speed is 5m / min. The vacuum oven in step B The temperature is 130°C, and the volume percentage of argon ...

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Abstract

The invention discloses a lithium iron phosphate power battery water-based cathode slurry. The cathode slurry consists of the following components in part by weight: 100 parts of lithium iron phosphate, 5 to 30 parts of a water-based adhesive, 3 to 20 parts of a conductive agent, 35 to 65 parts of deionized water, and 2 to 5 parts of absolute ethanol. The lithium iron phosphate power battery water-based cathode slurry has the advantages that the dispersity and the stability are high, the water content in a cathode pole piece can be easily eliminated, and the electrochemical performance is obviously improved.

Description

Technical field [0001] The invention relates to a method for preparing an aqueous positive electrode slurry of a lithium iron phosphate power battery and a positive electrode pole piece. Background technique [0002] At present, most of the lithium iron phosphate power batteries produced by domestic and foreign manufacturers use oily system formulations, such as using PVDF (polyvinylidene fluoride dichloride) as a binder and NMP (N-methylpyrrolidone) as a solvent. However, during the coating process, a large amount of NMP-containing gas is discharged into the air, polluting the environment. At the same time, the cost of NMP is high, which increases the production cost of the battery. Therefore, some manufacturers have adopted water-based systems. Using water-based systems can avoid environmental pollution and reduce production costs. However, because the conductive agent and lithium iron phosphate are not easily dispersed in the water-based system, the prepared slurry is easy to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/1397
CPCY02E60/10
Inventor 黄镇财
Owner HANGZHOU LIAO TECH
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