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Lithium-ion power battery positive electrode material slurry preparation method

A cathode material, power battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult dispersion, high stirring speed demand, and large heat generation, and achieve the effect of improving dispersion effect and good mixing effect.

Active Publication Date: 2015-06-03
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 provides a preparation method for lithium ion power battery positive electrode material slurry with good dispersion performance

Method used

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  • Lithium-ion power battery positive electrode material slurry preparation method
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  • Lithium-ion power battery positive electrode material slurry preparation method

Examples

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Effect test

Embodiment 1

[0029] 100 parts by weight of nanoscale lithium iron phosphate cathode material (primary particle size is 30nm, specific surface area 18.3m 2 / g), 3 parts by weight of conductive carbon black, 1 part by weight of vapor-grown carbon fiber (VGCF), and 6 parts by weight of polyvinylidene fluoride were put into a three-shaft mixer, and dry-mixed for 10 minutes. Then the jacket of the three-axis mixer is fed with hot water to raise the temperature to 60°C, and 35 parts by weight of solvent N-methylpyrrolidone is added. After the solvent is added, the mixer is vacuumed to -0.095MPa and stirred for 45 minutes; continue to add 35 parts by weight of Solvent N-methylpyrrolidone, stirred for 45 minutes to complete the initial dispersion. Transfer the first dispersed slurry to a four-axis planetary mixer, pour cold water into the jacket of the four-axis planetary mixer to cool down to 35°C, add 40 parts by weight of solvent N-methylpyrrolidone, and vacuumize the mixer to -0.095MPa , and ...

Embodiment 2

[0031] 100 parts by weight of nanoscale lithium iron phosphate cathode material (primary particle size is 30nm, specific surface area 18.3m 2 / g), 3 parts by weight of conductive carbon black, and 5 parts by weight of polyvinylidene fluoride were put into a three-shaft mixer, and dry mixed and stirred for 5 minutes. Then the jacket of the three-axis mixer is fed with hot water to raise the temperature to 45°C, and 36 parts by weight of solvent N-methylpyrrolidone is added. After the solvent is added, the mixer is evacuated to -0.098MPa and stirred for 60 minutes; continue to add 36 parts by weight of Solvent N-methylpyrrolidone, stirred for 60 minutes to complete the initial dispersion. Transfer the first dispersed slurry to a four-axis planetary mixer, pass cold water into the jacket of the four-axis planetary mixer to cool down to 45°C, add 48 parts by weight of solvent N-methylpyrrolidone, and vacuumize the mixer to -0.098MPa , and stirred for 60 minutes to complete the se...

Embodiment 3

[0033] 100 parts by weight of nanoscale lithium iron phosphate cathode material (primary particle size is 30nm, specific surface area 18.3m 2 / g), 5 parts by weight of conductive carbon black, and 7 parts by weight of polyvinylidene fluoride were put into a three-shaft mixer, and were dry mixed and stirred for 7 minutes. Then the jacket of the three-axis mixer is fed with hot water to raise the temperature to 50°C, and 40 parts by weight of solvent N-methylpyrrolidone is added. After the solvent is added, the mixer is vacuumed to -0.096MPa and stirred for 50 minutes; continue to add 40 parts by weight of Solvent N-methylpyrrolidone, stirred for 50 minutes to complete the initial dispersion. Transfer the first dispersed slurry to a four-axis planetary mixer, pass cold water into the jacket of the four-axis planetary mixer to cool down to 30°C, add 20 parts by weight of solvent N-methylpyrrolidone, and vacuumize the mixer to -0.096MPa , and stirred for 45 minutes to complete the...

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Abstract

The present invention discloses a lithium-ion power battery positive electrode material slurry preparation method, which comprises mixing various components of a positive electrode material slurry, wherein the mixing specifically comprises: 1, using a three-shaft stirrer to carry out dry mixing on a positive electrode active substance, an electric conduction agent and a binder, 2, adding partial solvent to the three-shaft stirrer, and carrying out primary dispersion, and 3, transferring the dispersed slurry to a planetary stirrer, adding the remaining solvent, and carrying out secondary dispersion. According to the present invention, the dry mixing process is used, the solvent is gradually added to the solid powder, and the high solid content of the system is utilized to improve the dispersion effect; and the three-shaft stirrer and the planetary stirrer are combined so as to achieve the good mixing effect.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a preparation method of a positive electrode material slurry of a lithium ion power battery. Background technique [0002] Lithium-ion power batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. The structure of a general lithium-ion power battery is: in the form of laminations, a battery cell is formed by interleaving the positive electrode, separator, and negative electrode (or the battery is made in the form of winding), and then connected to the external terminal and placed in a hard case (such as Plastic shell, steel shell, aluminum shell) or aluminum plastic film, inject electrolyte. [0003] In general lithium-ion power batteries, the positive electrode is made of micron-level lithium iron phosphate, and the negative electrode is made of trad...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/10
Inventor 吕豪杰金荣在李青柱陈军
Owner WANXIANG 123 CO LTD
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