Preparation method of positive electrode slurry suitable for 12V start-stop power supply

A technology of positive electrode and positive electrode slurry for power supply, applied in electrode manufacturing, circuits, electrical components, etc., can solve the problems of difficult dispersion, large heat generation, and high demand for stirring speed, so as to improve the dispersion effect, generate large heat, and avoid slurry. effect of precipitation

Inactive Publication Date: 2021-06-25
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to overcome the shortcomings of nano-scale positive electrode materials that are not easy to disperse, require high stirring speed, and generate large amounts of heat when making slurry, and provide a method for preparing positive electrode material slurry for lithium-ion starting batteries with good dispersion performance.

Method used

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  • Preparation method of positive electrode slurry suitable for 12V start-stop power supply
  • Preparation method of positive electrode slurry suitable for 12V start-stop power supply
  • Preparation method of positive electrode slurry suitable for 12V start-stop power supply

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In a 30L three-shaft mixer, 100 parts by weight of nano-scale lithium iron phosphate (primary particle size of 50nm, specific surface area of ​​12.5m 2 / g), 1 weight part of conductive carbon black, 36 weight parts of carbon nanotube conductive liquid (solid content 5%), and 2 weight parts of polyvinylidene fluoride were put into a three-axis mixer, and premixed for 15 minutes ( revolution 15rpm); then add 5 parts by weight of solvent N-methylpyrrolidone, stir for 15 minutes (revolution 25rpm, rotation 300rpm), the solid content of the slurry is 78%, and the powder is infiltrated into small spherical particles; continue to add 11 parts by weight The solvent N-methylpyrrolidone, stirred for 30 minutes (revolution 25rpm, autorotation 500rpm), completed pre-kneading; after pre-kneading, continued to stir for 120 minutes (revolution 25rpm, autorotation 1000rpm), the solid content of the slurry was 68%, and the material was uniform Dough; add 55 parts by weight of solvent N-...

Embodiment 2

[0033] In a 30L three-shaft mixer, 100 parts by weight of nano-scale lithium iron phosphate (primary particle size of 50nm, specific surface area of ​​12.5m 2 / g), 2 parts by weight of conductive carbon black, 30 parts by weight of carbon nanotube conductive liquid (solid content 5%), and 3 parts by weight of polyvinylidene fluoride were put into a three-axis mixer, and pre-mixed and stirred for 10 minutes ( revolution 15rpm); then add 6 parts by weight of solvent N-methylpyrrolidone, stir for 10 minutes (revolution 25rpm, rotation 300rpm), the solid content of the slurry is 75%, and the powder is infiltrated into small spherical particles; continue to add 12 parts by weight The solvent N-methylpyrrolidone, stirred for 30 minutes (revolution 25rpm, rotation 500rpm), to complete the pre-kneading; after pre-kneading, continue to stir for 90 minutes (revolution 25rpm, rotation 1000rpm), the solid content of the slurry is 66%, and the material is uniform Dough; add 60 parts by wei...

Embodiment 3

[0035] In a 30L three-shaft mixer, 100 parts by weight of nano-scale lithium iron phosphate cathode material (primary particle size of 50nm, specific surface area of ​​12.5m 2 / g), 2 parts by weight of conductive carbon black, 36 parts by weight of carbon nanotube conductive liquid (solid content 5%), and 3 parts by weight of polyvinylidene fluoride were put into a three-axis mixer, and premixed for 20 minutes ( revolution 15rpm); then add 5 parts by weight of solvent N-methylpyrrolidone and stir for 20 minutes (revolution 25rpm, rotation 300rpm). The solid content of the slurry is 80%, and the powder is infiltrated into small spherical particles; continue to add 12 parts by weight of Solvent N-methylpyrrolidone, stir for 60 minutes (revolution 25rpm, rotation 500rpm), complete pre-kneading; continue stirring for 180 minutes after pre-kneading (revolution 25rpm, rotation 1000rpm), the solid content of the slurry is 69%, and the material is uniform Dough shape; add 58 parts by w...

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Abstract

The invention relates to a preparation method of positive electrode slurry suitable for a 12V start-stop power supply, belongs to the technical field of automobile start-stop battery systems, and mainly solves the problems that small-particle-size particles are difficult to disperse and the dispersion time is long when the nanoscale lithium iron phosphate positive electrode slurry is prepared at present. The method is mainly characterized by comprising the following steps: premixing a positive active material, a conductive agent and a binder by using a three-shaft stirrer; adding part of the solvent for wetting; adding part of the solvent for pre-kneading; kneading in a three-shaft stirrer; adding the residual solvent, and diluting to proper viscosity; and vacuumizing and defoaming to obtain the lithium iron phosphate slurry suitable for coating. A high-viscosity kneading process is adopted, a solvent is gradually added into solid powder, the dispersion effect is improved by utilizing the action force that materials are continuously extruded, stretched, folded, sheared and the like under the high solid content, and the preparation method is mainly used for preparing the 12V start-stop power supply positive electrode slurry.

Description

technical field [0001] The invention belongs to the technical field of automobile start-stop battery systems, and in particular relates to a preparation method for anode material slurry suitable for 12V lithium ion start-stop batteries. Background technique [0002] With the gradual reduction of national new energy vehicle subsidies and the gradual implementation of the double credit policy, the country has proposed a fuel consumption target of 5L / 100km for vehicles in 2020. In order to meet the target requirements of fuel consumption limits, the automotive industry must adopt various technical solutions to improve energy-saving effects. [0003] In terms of assembly, there is less and less space to meet the energy-saving effect by simply improving the combustion efficiency of the internal combustion engine. Vehicle hybridization and pure electrification are the best technical routes. Although electrification is the ultimate goal of automobiles, it cannot be widely populari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/0525B82Y40/00
CPCH01M4/04H01M10/0525B82Y40/00Y02E60/10
Inventor 刘长来夏诗忠廖崇静孙光忠朱彩兵刘勇张宝华
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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