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Preparation method of high-efficiency lithium-ion battery slurry

A lithium-ion battery and slurry technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high comprehensive cost, many process steps, and low production efficiency, achieve good magnification and cycle performance, reduce process steps, The effect of shortening the mixing time

Inactive Publication Date: 2018-04-10
SHANXI CHANGZHENG POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion battery is a kind of secondary battery (rechargeable battery), which has the advantages of high working voltage, large specific energy, long cycle life, and good safety performance. To make lithium-ion batteries, it is first necessary to prepare slurry, that is, positive or negative active materials, The conductive agent, binder and solvent are mixed and stirred into a slurry; the traditional mixing process is to dissolve the binder in the solvent to make a glue, then add different types of conductive agents in batches for stirring, and finally add the active material Stir and adjust the viscosity before discharging; whether the slurry is evenly dispersed directly affects the coating quality, thereby affecting the electrochemical performance of the battery. The current slurry preparation method has many steps, long stirring time, low production efficiency, and poor dispersion. Disadvantages of uniformity and high comprehensive cost

Method used

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  • Preparation method of high-efficiency lithium-ion battery slurry
  • Preparation method of high-efficiency lithium-ion battery slurry
  • Preparation method of high-efficiency lithium-ion battery slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a kind of preparation method of high-efficiency lithium-ion battery slurry, and its technological process is as follows figure 1 As shown, it specifically includes the following steps: add 950g of nickel-cobalt-manganese ternary material, 15g of conductive carbon black, 20g of conductive graphite and 15g of polyvinylidene fluoride into a 5L stirring tank, stir slowly for 30min without vacuum, and rotate at a speed of 10r / min , the rotation speed is 500r / min; then add 62.5g N-methylpyrrolidone and stir slowly for 10min, the revolution speed is 10r / min, the rotation speed is 500r / min, scrape the slurry on the stirring paddle into the stirring tank, and vacuumize to -90KPa, Adjust the revolution speed to 30r / min, the autorotation speed to 1500r / min, and stir for 30min; then add 200g of N-methylpyrrolidone and stir slowly for 10min, the revolution speed to 10r / min, the autorotation speed to 500r / min, and scrape the slurry on the stirring paddle Put ...

Embodiment 2

[0027] This embodiment provides a kind of preparation method of high-efficiency lithium-ion battery slurry, and its technological process is as follows figure 1 As shown, it specifically includes the following steps: add 950g of nickel-cobalt-manganese ternary material, 15g of conductive carbon black, 20g of conductive graphite and 15g of polyvinylidene fluoride into a 5L stirring tank, stir slowly for 30min without vacuum, and rotate at a speed of 10r / min , the rotation speed is 500r / min; then add 112.5g N-methylpyrrolidone and stir slowly for 10min, the revolution speed is 10r / min, the rotation speed is 500r / min, scrape the slurry on the stirring paddle into the stirring tank, and evacuate to -90KPa, Adjust the revolution speed to 30r / min, the autorotation speed to 1500r / min, and stir for 60min; then add 250g N-methylpyrrolidone and stir slowly for 10min, the revolution speed to 10r / min, the autorotation speed to 500r / min, and scrape the slurry on the stirring paddle Put it ...

Embodiment 3

[0029] This embodiment provides a kind of preparation method of high-efficiency lithium-ion battery slurry, and its technological process is as follows figure 1 As shown, it specifically includes the following steps: add 950g of nickel-cobalt-manganese ternary material, 15g of conductive carbon black, 20g of conductive graphite and 15g of polyvinylidene fluoride into a 5L stirring tank, stir slowly for 30min without vacuum, and rotate at a speed of 10r / min , the rotation speed is 500r / min; then add 162.5g N-methylpyrrolidone and stir slowly for 10min, the revolution speed is 10r / min, the rotation speed is 500r / min, scrape the slurry on the stirring paddle into the stirring tank, and evacuate to -90KPa, Adjust the revolution speed to 30r / min, the autorotation speed to 1500r / min, and stir for 90min; then add 300g of N-methylpyrrolidone and stir slowly for 10min, the revolution speed to 10r / min, the autorotation speed to 500r / min, and scrape the slurry on the stirring paddle Put ...

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Abstract

The invention discloses a preparation method of high-efficiency lithium-ion battery slurry. The preparation method comprises 1: adding a powdery active material, a conductive agent and a binder into amixer and carrying out uniform stirring, 2: adding 10 to 40wt% of a solvent into the powdery material obtained in the step 1 and carrying out stirring, 3: adding 30-60 wt% of a solvent into the materials in the step 2 and carrying out stirring, and 4, adding the rest of the solvent into the materials in the step 3, carrying out stirring, carrying out filtration through a screen and discharging the materials. The preparation method reduces processes, is simple and easy, shortens stirring time and improves production efficiency. The prepared slurry is uniform and stable, is not easy to layer and improves lithium-ion battery rate and cycle performances.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of high-efficiency lithium ion battery slurry. Background technique [0002] Lithium-ion battery is a kind of secondary battery (rechargeable battery), which has the advantages of high working voltage, large specific energy, long cycle life, and good safety performance. To make lithium-ion batteries, it is first necessary to prepare slurry, that is, positive or negative active materials, The conductive agent, binder and solvent are mixed and stirred into a slurry; the traditional mixing process is to dissolve the binder in the solvent to make a glue, then add different types of conductive agents in batches for stirring, and finally add the active material Stir and adjust the viscosity before discharging; whether the slurry is evenly dispersed directly affects the coating quality, thereby affecting the electrochemical performance of the battery. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCH01M4/139Y02E60/10
Inventor 孙磊安富强
Owner SHANXI CHANGZHENG POWER TECH CO LTD
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