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Slurry mixing technology for cathode slurry of nanoscale lithium iron phosphate system lithium ion battery

A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problem of uniform dispersion of slurry, achieve the effect of low requirements and wide application range

Inactive Publication Date: 2018-06-12
JIANGSU FRONT NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous improvement of battery performance requirements, nano-scale lithium iron phosphate is applied on a large scale, but limited by the limitation of slurry mixing equipment, how to make the slurry uniformly dispersed has become a difficult problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0013] The present invention is a slurry mixing process of a nano-scale lithium iron phosphate system lithium ion battery positive electrode slurry, which comprises the following steps in terms of mass percentage:

[0014] 1. Gluing: take 42Kg PVDF (polyvinylidene fluoride) and add 453Kg NMP, and then stir and disperse: revolution 15-35rpm, rotation 500-1500rpm, vacuum -60-90kPa, high-speed After stirring and dispersing for 3 to 4 hours, leave it in vacuum for 6 hours to obtain PVDF glue;

[0015] 2. Configure conductive glue: add 25KgSP and 25Kg graphene conductive agent to the 100% glue configured above, and then stir under the condition of vacuum degree of -60~-90kPa, the stirring speed is: revolution 33rpm, rotation 1300rpm; The stirring time is 3 hours to obtain a uniformly dispersed conductive glue;

[0016] 3. Positive electrode slurry configuration: add 750Kg of lithium iron phosphate to the 100% conductive adhesive configured above, and then stir for 4 hours under th...

Embodiment 2）

[0018] A slurry mixing process of nanoscale lithium iron phosphate system lithium ion battery positive electrode slurry, in terms of mass percentage, has the following steps:

[0019] 1. Gluing: take 20Kg PVDF (polyvinylidene fluoride) and add 416Kg of NMP, and then stir and disperse: revolution 15~35rpm, rotation 500~1500rpm, vacuum degree -60~-90kPa, high speed After stirring and dispersing for 3 to 4 hours, leave it in vacuum for 6 hours to obtain PVDF glue;

[0020] 2. Configure conductive adhesive: add 20Kg of SP conductive agent to the 100% adhesive configured above, and then stir under the condition of vacuum degree of -60 ~ -90kPa. The stirring speed is: revolution 33rpm, rotation 1300rpm; stirring time For 3 hours, a uniformly dispersed conductive glue solution was obtained.

[0021] 3. Positive electrode slurry configuration: Add 750Kg of lithium iron phosphate to the 100% conductive adhesive configured above, and then stir for 4 hours under the conditions of revolu...

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PUM

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Abstract

The invention relates to a slurry mixing technology for the cathode slurry of a nanoscale lithium iron phosphate system lithium ion battery, so as to improve the slurry dispersion effect and the slurry consistency. The technology comprises the following steps: 1) glue making; 2) preparation of a conductive adhesive; 3) slurry mixing. The slurry prepared by the technology can be highly dispersed, the slurry fineness can reach below 10 micronsmum and below, and the slurry has the characteristics of uniformity, stability, long-time placement, etc.; the technology imposes relatively low requirements on equipment, overcomes the shortcomings of low-end slurry-mixing equipment to some extent, has a relatively wide application range and is applicable to slurry mixing industrialization of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, relates to lithium battery cathode materials, in particular to a slurry mixing process of nanoscale lithium iron phosphate system lithium ion battery cathode slurry. Background technique [0002] At present, there are many factors that restrict the consistency of lithium-ion batteries, such as: slurry mixing, coating, raw materials and battery cell preparation, and slurry mixing is a key factor affecting the consistency of its batteries. With the continuous improvement of battery performance requirements, nano-scale lithium iron phosphate is applied on a large scale, but limited by the limitation of slurry mixing equipment, how to make the slurry uniformly dispersed has become a difficult problem. Contents of the invention [0003] The purpose of the present invention is to overcome the defects existing in the prior art, and provide a slurry that can improve the consistency of the slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/04H01M4/5825H01M10/0525Y02E60/10
Inventor 赵燕超
Owner JIANGSU FRONT NEW ENERGY
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