Preparation method of lithium ion battery anode slurry

A lithium-ion battery and negative electrode slurry technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as inability to eliminate adhesion, increase equipment loss, increase energy consumption, etc., achieve large steric resistance, promote Dispersion, increase the effect of system viscosity

Inactive Publication Date: 2018-08-21
天臣新能源研究南京有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods either have too high requirements on the mixing equipment, which increases equipment loss, or take a long time and increase energy consumption.
And, in addition, the improvement of the slurry mixing process alone cannot eliminate the defects of low adhesion between the slurry and the foil and powder drop during the negative electrode sheet production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of a lithium-ion battery negative electrode slurry invented in Example 1 is based on negative electrode active material: thickener CMC: binder SBR: conductive agent SP: surfactant = 96:1.0:1.0:1.5:0.5 Weigh the negative electrode raw material, dissolve the thickener CMC in a solvent accounting for 40% of the total solid matter mass, stir until it is clear and transparent, and vacuum defoam; add the conductive agent SP, stir for 30 minutes to form a uniform black mixture, and then add the surfactant, Fully stir for 30 minutes; add the active material in three batches and stir for 1.5 hours; finally add the binder SBR, stir for 20 minutes, and adjust the viscosity of the slurry to 4500mPa.s with a solvent. At this time, the solid content is 44%, and the scraper fineness is less than or equal to 35um.

[0019] In Example 1, the active material is a mixture of artificial graphite and modified natural graphite.

[0020] In Example 1, the content of th...

Embodiment 2

[0023] According to the negative electrode active material: thickener CMC: binder SBR: conductive agent SP: surfactant = 95:1.0:1.0:1.5:1.5 Weigh negative electrode raw materials, thickener CMC is dissolved in 40% of total solid matter mass In the solvent, stir until clear and transparent, vacuum defoaming; add conductive agent SP, stir for 30 minutes to form a uniform black mixture, then add surfactant, stir fully for 40 minutes; add active material in three batches, stir for 1.5 hours; finally Add the binder SBR, stir for 20 minutes, and adjust the viscosity of the slurry to 5000mPa.s with a solvent. At this time, the solid content is 46%, and the fineness of the scraper is less than or equal to 35um.

[0024] In Example 2, the active material is a mixture of artificial graphite and modified natural graphite.

[0025] In Example 2, the content of the surfactant is 0.5-5 wt%, and the surfactant is silane coupling agent kh560.

[0026] In Example 2, the conductive agent is Su...

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PUM

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Abstract

The invention relates to a preparation method of lithium ion battery anode slurry. The method comprises the following steps: a. weighing anode slurry, an active material, a conductive agent, a thickener, a binder, a solvent and a surfactant in the lithium ion battery anode slurry ratio; b. mixing the thickener with the solvent in the raw materials, adding the conductive agent to the mixed solventafter full stirring, and continuing stirring the mixture uniformly; c, adding the surfactant to the mixture of step b, performing stirring, adding the active material in three batches, and fully stirring the mixture again for 1. 5 h to obtain slurry a with uniform appearance; d, adding the binder to the slurry a, and adjusting the viscosity of the slurry with the solvent in the stirring process toobtain the lithium ion battery anode slurry. With adoption of a step-by-step wet mixing process, the anode slurry is dispersed evenly, the conductive agent SP and the active material form a mutuallydispersed interlocking microstructure, stability is good, settling is not likely to occur, and peel strength of a prepared pole piece is significantly improved compared with that of a pole piece prepared with the traditional process.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing negative electrode slurry of lithium ion batteries. Background technique [0002] Slurry mixing technology is an important process in the production of lithium-ion batteries. The uniformity of the negative electrode active material, conductive agent and the bonding strength between the negative electrode sheet and the base foil are related to the subsequent manufacturing process and performance. SuperP Li(SP) is currently the main negative electrode conductive agent material in the slurry mixing process of lithium battery manufacturers, but the SP particles are only about 50nm, so the large specific surface area makes it easy to agglomerate during the slurry mixing process, and it is difficult to evenly cover the active material. The ideal state for the formation of material surfaces and the "interlocking" of active substances. The traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/62Y02E60/10
Inventor 刘彬
Owner 天臣新能源研究南京有限公司
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