Polycarboxylic acid hyper-dispersant for dispersing lithium iron phosphate precursor

A polycarboxylate-based, lithium iron phosphate technology, applied in electrical components, circuits, battery electrodes, etc., can solve problems such as a large number of bromide ions, increasing bromide ion content, and affecting sintering quality.

Active Publication Date: 2012-06-20
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the particle size becomes smaller and smaller, the electrode active materials in the slurry can easily form secondary aggregates during the mixing and dispersion process of the lithium battery slurry, which will cause serious agglomeration of the lithium battery slurry and affect the lithium battery slurry. Subsequent sintering quality
[0004] There is no hyperdispersant specially used for dispersing the lithium iron phosphate precursor. There are reports in the literature that cetyltrimethylammonium bromide is used as a dispersant, but adding cetyltrimethylammonium bromide will make the The content of bromide ions in the finished product increases, thereby contaminating the precursor, and a large amount of foam will be generated when the precursor is prepared
There are also literatures using polyacrylamide as a dispersant, but the dispersion effect of polyacrylamide is limited, especially since it is insoluble in organic solvents such as ethanol and acetone, there are great limitations in its use

Method used

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  • Polycarboxylic acid hyper-dispersant for dispersing lithium iron phosphate precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 300 parts of isopentenol polyoxyethylene ether and 140 parts of water in the reaction kettle, and keep stirring to make them all dissolved in water; then add 1.6 parts of hydrogen peroxide and stir for half an hour. Take 0.3 parts of terpinene and 1.2 parts of isopropanol, dissolve them in 140 parts of water, as drop A; take 48 parts of methacrylic acid and dissolve them in 120 parts of water, as drop B; within 3 to 4 hours, simultaneously Add dropwise to the reaction kettle evenly, and ensure that the dropwise addition of A is half an hour later than the dropwise addition of B. During this time, the temperature will rise slightly, and it can be controlled not to exceed 40 °C. After adding, continue stirring for 1 hour, add 24 parts of diethanolamine, and continue stirring for 30 minutes to obtain the product (TDS-1).

Embodiment 2

[0032] Add 310 parts of isopentenol polyoxyethylene ether and 140 parts of water in the reaction kettle, and keep stirring to make them all dissolved in water; then add 1.5 parts of hydrogen peroxide and stir for half an hour. Take 0.7 part of vinyl acetate and 1.0 part of ascorbic acid, dissolve it in 138 parts of water, as drop A; take 38 parts of acrylic acid and dissolve it in 125 parts of water, as drop B; in 3 to 4 hours, at the same time, uniform dropwise addition reaction In the kettle, ensure that the dripping of A is half an hour later than the dripping of B. During this time, the temperature will rise slightly, and it can be controlled not to exceed 40 °C. After adding, continue stirring for 1 hour, add 20 parts of ethanolamine, and continue stirring for 30 minutes to obtain the product (TDS-2).

Embodiment 3

[0034] Add 380 parts of isopentenol polyoxyethylene ether and 115 parts of water in the reaction kettle, and keep stirring to make them all dissolved in water; then add 1.6 parts of tert-butyl hydrogen peroxide and stir for half an hour. Take 0.6 parts of isopropanol and 1.2 parts of hypophosphorous acid, dissolve in 130 parts of water, as drop A; take 40 parts of acrylic acid and dissolve in 80 parts of water, as drop B; within 3~4 hours, add dropwise evenly at the same time In the reaction kettle, ensure that the dripping of A is half an hour later than the dripping of B. During this time, the temperature will rise slightly, and it can be controlled not to exceed 40 °C. After adding, continue stirring for 1 hour, add 22 parts of triethanolamine, and continue stirring for 30 minutes to obtain the product (TDS-3).

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Abstract

The invention discloses a preparation method of a polycarboxylic acid hyper-dispersant for dispersing lithium iron phosphate precursors, which comprises the following steps: firstly dissolving isoamylene alcohol polyoxyethylene ether in water, adding an oxidant solution, stirring uniformly; than dropwisely adding a mixed solution of a reducing agent and a chain transfer agent, and a comonomer solution respectively for polymerization; finally, adding an alkaline regulator for neutralization and curing so as to obtain the polycarboxylic acid hyper-dispersant for dispersing lithium iron phosphate precursors. Aiming at the characteristics that the system is weak acidic during the dispersion of lithium iron phosphate precursors and organic solvents such as ethanol and the like are used as a dispersing carrier, the hyper-dispersant prepared in the invention can effectively prevent electrode active materials in slurry from forming secondary aggregates, does not introduce impurity ions which are not contained in the precursors, thus ensures the mixing uniformity of the precursors, and further allows the preparation of lithium iron phosphate products with excellent performance.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a preparation method of a polycarboxylic acid-based hyperdispersant for dispersing lithium iron phosphate precursors in the preparation process of lithium battery cathode materials. Background technique [0002] Lithium iron phosphate (LiFePO4) has the advantages of good safety performance, relatively stable oxidation state, good cycle life, wide source of raw materials, cheap price, good high temperature resistance, high reversible charge specific capacity, non-toxic, non-polluting, etc. It is a new generation of Ideal cathode material for lithium-ion batteries. In-depth research on this type of material and actively promoting its industrialization are the key factors to solve the current lithium-ion batteries that are expensive, poor in safety, complicated in protection measures, and difficult to scale up. Its industrialization can not only make full use of my coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F4/40C08F2/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 陈国新李子郯黄国泓祝烨然王冬杜志芹
Owner NANJING RUIDI HIGH TECH
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