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Preparation method of lithium iron phosphate positive electrode material slurry

A technology of lithium iron phosphate and positive electrode materials, which is applied in chemical instruments and methods, battery electrodes, phosphorus compounds, etc., and can solve problems such as high stirring speed requirements, large heat production, and difficulty in dispersing

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

[0004] The invention aims to overcome the shortcomings of lithium iron phosphate positive electrode material that are not easy to disperse, require high stirring speed, and produce large heat when making slurry, and provides a preparation method for lithium iron phosphate positive electrode material slurry with good dispersion performance

Method used

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  • Preparation method of lithium iron phosphate positive electrode material slurry
  • Preparation method of lithium iron phosphate positive electrode material slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 50L planetary mixer, put 6 parts by weight of polyvinylidene fluoride powder into 69 parts by weight of N-methylpyrrolidone solvent, stir and wet at 15 / 300rpm for 5 minutes with revolution / autobiography, and then use revolution / autobiography Stir and disperse at 25 / 1200 rpm for 120 min, respectively, to obtain a glue solution with a solid content of 8%. Put 1 part by weight of vapor-grown carbon fiber and 3 parts by weight of conductive carbon black into the prepared glue, stir and wet at 15 / 300 rpm for revolution / autopropagation for 5 minutes, and then stir at 25 / 1400 rpm for revolution / autopropagation Disperse for 30 minutes to prepare a conductive glue with a solid content of 12%. 100 parts by weight of lithium iron phosphate powder were put into a three-axis mixer, and the prepared conductive glue was divided into two equal parts. The first part of conductive glue was added to the three-axis mixer, and the revolution / autopropagation were respectively 15 / 300rpm ...

Embodiment 2

[0026] In a planetary mixer, put 5 parts by weight of polyvinylidene fluoride powder into 45 parts by weight of N-methylpyrrolidone solvent, stir and wet at 15 / 300rpm for revolution / autopropagation for 5min, and then use revolution / autopropagation respectively Stir and disperse at 25 / 1200 rpm for 120 minutes to prepare a glue solution with a solid content of 10%. Put 3 parts by weight of conductive carbon black into the prepared glue, stir and wet at 15 / 300 rpm for revolution / autopropagation for 5 minutes, and then stir and disperse for 30 minutes at 25 / 1400 rpm for revolution / autopropagation to obtain a solid content of 15% conductive glue. Put 100 parts by weight of lithium iron phosphate powder into a three-axis mixer, and divide the prepared conductive glue into two parts. The first part of conductive glue is added to the three-axis mixer, and dispersed for 30 minutes at 15 / 400 rpm for revolution / autopropagation. Then add the second portion of conductive glue, and dispers...

Embodiment 3

[0028] In a planetary mixer, put 7 parts by weight of polyvinylidene fluoride powder into 63 parts by weight of N-methylpyrrolidone solvent, stir and wet at 15 / 300rpm for revolution / autobiography for 5min, and then use revolution / autobiography respectively Stir and disperse at 25 / 1200 rpm for 120 minutes to prepare a glue solution with a solid content of 10%. Put 5 parts by weight of conductive carbon black into the prepared glue, stir and wet at 15 / 300 rpm for revolution / autopropagation for 5 minutes, then stir and disperse at 25 / 1400 rpm for revolution / autopropagation for 30 minutes to obtain a solid content of 16% conductive glue. 100 parts by weight of lithium iron phosphate powder were put into a three-axis mixer, and the prepared conductive glue was equally divided into two parts. The first part of conductive glue was added to the three-axis mixer, and the revolution / autopropagation were respectively 15 / 500rpm and dispersed for 30 minutes. Then add the second portion of...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate positive electrode material slurry; the positive electrode material slurry is composed of lithium iron phosphate, a binder, a conductive agent and a solvent; the preparation method comprises the step of mixing the components in the positive electrode material slurry, wherein the mixing comprises four processes of adhesive solution preparation, conductive agent dispersion, lithium iron phosphate dispersion and dilution stabilizing. The conductive adhesive solution is added step by step into a lithium iron phosphate powder, and with use of shearing action of a device on a high-solid-content dispersion system, the acting force between particles and the acting force between the particles and the device are increased so as to achieve an excellent dispersion effect.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a preparation method of lithium iron phosphate cathode material slurry. 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. The positive electrode uses lithium iron phosphate, and the negative electrode uses traditional lithium-ion power batteries made of graphite materials. When making positive electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCC01B25/45H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 李凡群饶绍建朱修锋韩笑谭哥苏文俊陈军
Owner WANXIANG 123 CO LTD
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