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Lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and diaphragm technology, applied in the field of lithium-ion battery diaphragm and its preparation, can solve the problems of easy aggregation of ceramic particles, achieve the effect of strengthening hydrophobicity, improving liquid absorption and retention capacity, and uniform pore distribution

Inactive Publication Date: 2020-07-31
华鼎国联四川动力电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the present invention provides a lithium-ion battery separator and its preparation method to solve the problem of easy agglomeration of ceramic particles in the prior art and further improve the ability of the separator to absorb and retain liquid

Method used

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  • Lithium ion battery diaphragm and preparation method thereof

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preparation example Construction

[0045] The preparation method of lithium-ion battery diaphragm of the present invention comprises the following steps:

[0046] 1) Add the nano-ceramic fiber and dispersant to the solvent and stir evenly, then ultrasonically disperse to obtain the nano-ceramic fiber mixture; the nano-ceramic fiber is at least aluminum oxide, zirconium oxide, silicon oxide, titanium oxide, silicon nitride One; the dispersant is at least one of polyacrylamide, hydroxypropyl methylcellulose, and triethyl phosphate, and the mass percentage of the dispersant is 3% to 10%; the solvent is N - At least one of methylpyrrolidone, chloroform, dimethylacetamide, and tetrahydrofuran; the stirring time is 10-30min, and the stirring speed is 200-600r / min; the ultrasonic dispersion, dispersion The time is 10-30min, and the dispersion frequency is 10-110KHz;

[0047] 2) Add a co-solvent to the above mixed solution, in a stirring state, then add raw material A to dissolve; the co-solvent is LiCl, CaCl 2 , Li ...

Embodiment 1

[0058] 1) Add silicon oxide nanofibers and polyacrylamide into chloroform and stir for 10 minutes at a stirring speed of 500r / min, then disperse in ultrasonic waves for 10 minutes at a dispersion frequency of 60KHz; obtain a mixed solution of silicon oxide nanofibers; In the mixed solution, the mass percentage of the nano-ceramic fiber is 10%; the mass percentage of the dispersant is 3%;

[0059] 2) Add LiCl to the above mixed solution, and keep stirring at a stirring speed of 600r / min, then add p-phenylenediamine and stir until completely dissolved; the mass of LiCl is 5% of the mass of the nano-ceramic fiber mixed solution;

[0060] 3) Lower the temperature to 5°C, increase the stirring speed to 900r / min, add terephthaloyl chloride, and react for 5 minutes to obtain a mixed solution of nano-ceramic fibers and in-situ polymerized aromatic polyamide, that is, before coating Mixed slurry; in the mixed slurry before coating, the mass percentage of nano-ceramic fiber is 5%, and t...

Embodiment 2

[0067] 1) Add silicon oxide nanofibers and polyacrylamide into chloroform and stir for 10 minutes at a stirring speed of 500r / min, then disperse in ultrasonic waves for 10 minutes at a dispersion frequency of 60KHz; obtain a mixed solution of silicon oxide nanofibers; In the mixed solution, the mass percentage of the nano-ceramic fiber is 8%; the mass percentage of the dispersant is 3%;

[0068] 2) Add LiCl to the above mixed solution, and keep stirring at a stirring speed of 600r / min, then add p-phenylenediamine and stir until completely dissolved; the mass of LiCl is 3% of the mass of the nano-ceramic fiber mixed solution;

[0069] 3) Lower the temperature to 5°C, increase the stirring speed to 900r / min, add terephthaloyl chloride, and react for 5 minutes to obtain a mixed solution of nano-ceramic fibers and in-situ polymerized aromatic polyamide, that is, before coating Mixed slurry; in the mixed slurry before coating, the mass percentage of nano-ceramic fiber is 3%, and th...

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Abstract

The invention relates to a lithium ion battery diaphragm and a preparation method thereof, and belongs to the technical field of batteries. The diaphragm is a multi-layer composite diaphragm, and comprises a base material and a coating layer formed by coating a single surface or double surfaces of the base material with mixed slurry of nano ceramic fibers and aromatic polyamide, and after ionic liquid modification, a composite diaphragm structure taking the coating layer as a three-dimensional fiber space network framework and taking the base material as a diaphragm thermal shutdown is formed.The preparation method comprises the following steps: 1) performing in-situ polymerization in uniformly dispersed nano ceramic fibers to form aromatic polyamide to obtain mixed slurry; 2) coating thesurface of a base material with the mixed slurry; 3) carrying out drying and water washing on the coated composite diaphragm, placing the composite diaphragm in an ionic liquid, and carrying out vacuum impregnation; and 4) drying the impregnated composite diaphragm to obtain the lithium ion battery composite diaphragm. The lithium ion battery diaphragm provided by the invention has a three-dimensional fiber space network structure skeleton, has good electrolytic solution absorption and retention capability, and is beneficial to improvement of battery safety, cycle and rate capability.

Description

technical field [0001] The invention relates to a lithium-ion battery separator and a preparation method thereof, belonging to the technical field of batteries. Background technique [0002] In recent years, the world's energy crisis and environmental pollution problems have become increasingly prominent. Lithium-ion batteries are widely used due to their high energy density, low self-discharge, long cycle life, no memory effect, and environmental protection. However, lithium-ion batteries also have some problems that need to be solved urgently, such as safety accidents, especially thermal safety issues. [0003] Lithium-ion batteries are mainly composed of positive and negative electrodes, electrolyte, separator and assembly materials. One of the functions of the diaphragm is a microporous diaphragm between the positive and negative electrodes, which separates the positive and negative electrodes and prevents the short circuit between the positive and negative electrodes;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417
CPCH01M10/0525H01M50/403H01M50/431H01M50/44H01M50/411Y02E60/10
Inventor 刘妮娜邱扬孙延先马艳唐姚
Owner 华鼎国联四川动力电池有限公司
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