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Preparation method of polyolefin lithium ion battery diaphragm

A polyolefin diaphragm and polyolefin technology, applied in lithium batteries, circuits, electrical components, etc., can solve problems such as lithium ion micropore channel blockage and affect electrochemical performance, and achieve the effect of avoiding the performance of the diaphragm and improving its performance

Inactive Publication Date: 2019-08-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above schemes ignore the swelling of the polymer in the electrolyte, which leads to the blockage of the micropore channels of lithium ions and affects its electrochemical performance.

Method used

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  • Preparation method of polyolefin lithium ion battery diaphragm

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Effect test

Embodiment 1

[0032] A polyolefin lithium battery diaphragm, with wet-process polyethylene lithium battery diaphragm (9um, porosity 42vol%) as the substrate, the double-sided scraping pattern of the polyolefin diaphragm has modified polymethyl methacrylate (PMMA) organic coating Layer fiber coating, modified polymethyl methacrylate (PMMA) organic matter coating thickness is 0.5-1um; Described modified polymethyl methacrylate (PMMA) organic matter is α alumina particles and polyformaldehyde A mixture of methyl acrylate.

[0033] The preparation method of the above polyolefin lithium battery diaphragm, the specific steps are as follows:

[0034] 1) Disperse α-alumina particles with a particle size of 30nm in deionized water at a mass ratio of 1:9, add 1-2wt% sodium lauryl sulfate, and use 10wt% hydrochloric acid aqueous solution to adjust the pH to 1- 3. Stir for 2 hours to obtain an inorganic oxide-water dispersion;

[0035] 2) At room temperature, firstly mix methyl methacrylate and deion...

Embodiment 2

[0040] 1. A polyolefin lithium battery diaphragm, with a wet-process polyethylene lithium battery diaphragm (9um, porosity 42vol%) as a substrate, the double-sided scraping pattern of the polyolefin diaphragm has modified polymethyl methacrylate (PMMA) organic Coating fiber coating, the thickness of the modified polymethyl methacrylate (PMMA) organic coating is 0.5-1um; the modified polymethyl methacrylate (PMMA) organic is alpha alumina particles and poly A mixture of methyl methacrylates.

[0041] The preparation method of the above polyolefin lithium battery diaphragm, the specific steps are as follows:

[0042] 1) Disperse α-alumina particles with a particle size of 30nm in deionized water at a mass ratio of 1:9, add 1-2wt% sodium lauryl sulfate, and use 10wt% hydrochloric acid aqueous solution to adjust the pH to 1- 3. Stir for 2 hours to obtain an inorganic oxide-water dispersion;

[0043] 2) At room temperature, firstly mix methyl methacrylate and deionized water at a...

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Abstract

The invention discloses a preparation method of a polyolefin lithium ion battery diaphragm. A porous polyolefin diaphragm used as a substrate is coated with a modified polymethyl methacrylate (PMMA) organic matter coating on one or both sides, and the modified polymethyl methacrylate organic matter is an organic matter compounded from inorganic oxide nanoparticles and polymethyl methacrylate. Aiming at the problem that the existing polypropylene or polyethylene porous diaphragm has low high-temperature integrity and the problem that the existing polypropylene or polyethylene film has poor wettability to electrolyte, the invention provides a polyolefin lithium ion battery diaphragm. The PMMA in the coating has good swelling property in ester electrolyte commonly used in lithium batteries, so that the polyolefin lithium ion battery diaphragm has high liquid absorption rate and lithium ion conductivity. In addition, the inorganic oxide nanoparticles in the coating can prevent the impedance increase of the diaphragm caused by PMMA swelling during battery use, so that the polyolefin lithium ion battery diaphragm has good cycle performance.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a polyolefin lithium battery separator and a preparation method thereof. Background technique [0002] The separator is the core part of the lithium battery. It not only absorbs the electrolyte and provides a channel for lithium ions to migrate through micropores, but also plays a key role in avoiding short circuits by cutting them off. Separators in current commercial Li-ion batteries are made of polyolefins such as polypropylene (PP) and polyethylene (PE). However, conventional polyolefin membranes have inconsistent polarity with organic electrolytes, which may lead to high resistance and poor cycle performance. [0003] At present, the method of improving the wettability of the lithium battery separator is mainly to coat the surface of the separator with an inert polymer (mainly polyvinylidene fluoride PVDF, polymethyl methacrylate PMMA) to improve the wettability of the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 唐浩林张海宁涂文愗林文
Owner WUHAN UNIV OF TECH