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Preparation method of boehmite slurry for lithium ion battery

A lithium-ion battery and boehmite technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the failure of polymer bonding properties, which cannot meet the needs of rapid manufacturing and thermal stability of boehmite coating layers at the same time Poor performance and other problems, to avoid the effect of high-speed shearing

Active Publication Date: 2020-10-16
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can meet the requirements of rapid manufacturing and fineness, but the bonding properties of polymers partially fail under high-speed shearing, resulting in poor thermal stability of the boehmite coating layer
The existing technology cannot meet the requirements of rapid manufacturing and slurry quality at the same time

Method used

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  • Preparation method of boehmite slurry for lithium ion battery
  • Preparation method of boehmite slurry for lithium ion battery
  • Preparation method of boehmite slurry for lithium ion battery

Examples

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Embodiment 1

[0044] A preparation method of boehmite slurry for lithium ion battery, comprising the steps of:

[0045] (1) Dissolve polyvinylidene fluoride powder (PVDF9700) in N-methylpyrrolidone solvent after pretreatment, stir, seal and age, and check to obtain polyvinylidene fluoride glue;

[0046] (2) Dissolving the boehmite powder in N-methylpyrrolidone solvent after pretreatment, stirring and checking to form a boehmite solution;

[0047] (3) Stir and mix the polyvinylidene fluoride glue and the boehmite solution to obtain a boehmite slurry after inspection.

[0048] The weight percentage of the polyvinylidene fluoride glue solution obtained in the step (1) is 10wt%.

[0049] The linear velocity of stirring in the step (1) is 4m / s, and the linear velocity of stirring in the step (2) is 17m / s.

[0050] Stir in the step (1) until no obvious polyvinylidene fluoride micelles are visible in the solution and stop stirring.

[0051] In the step (1), the aging temperature is 50° C., and ...

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Abstract

The invention provides a preparation method of boehmite slurry for a lithium ion battery, which comprises the following steps: pretreating polyvinylidene fluoride powder, dissolving the pretreated polyvinylidene fluoride powder in an N-methyl pyrrolidone solvent, stirring, carrying out sealed aging, and inspecting to obtain a polyvinylidene fluoride glue solution; pretreating boehmite powder, dissolving the pretreated boehmite powder in an N-methyl pyrrolidone solvent, stirring, and inspecting to form a boehmite solution; and stirring and mixing the polyvinylidene fluoride glue solution and the boehmite solution, and inspecting to obtain boehmite slurry. The preparation method provided by the invention can meet the requirements of rapid manufacturing and slurry quality at the same time, and can complete the uniform mixing process of polymer molecular chain opening, functional group stretching and boehmite powder and NMP solvent in a short time.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of boehmite slurry for lithium ion batteries. Background technique [0002] With the widespread application of lithium-ion batteries in the field of new energy, more and more safety issues are exposed during the use of batteries. At present, the positive electrode sheet commonly used in lithium ion batteries is composed of aluminum foil, positive electrode active materials (such as nickel cobalt lithium manganese oxide, lithium iron phosphate, etc.), conductive agent, binder, etc., and the negative electrode sheet is composed of copper foil, graphite, conductive agent, bonding agent, etc. composition etc. In the research on the safe use of batteries, it was found that when the positive electrode aluminum foil and the negative electrode graphite are in contact, the rapid discharge and combustion caused by low resistance is the biggest safety h...

Claims

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Application Information

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IPC IPC(8): C09D127/16C09D7/61H01M10/0525
CPCC09D127/16C09D7/61H01M10/0525C08K2003/2227C08K3/22Y02E60/10
Inventor 何玉杰郝华冉
Owner TIANJIN ENERGIES
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