High temperature resistant battery diaphragm containing cellulose fiber substrate and preparation method thereof

A cellulose fiber and battery separator technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of easy powder loss, increased production cost, poor consistency of the separator, etc., to prevent dendrites from piercing, prevent The effect of battery short circuit and increased adhesion

Inactive Publication Date: 2018-01-16
TIANJIN YISEN MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the diaphragm is easy to lose powder during vibration, curling and folding, and the consistency of the diaphragm is poor
The invention patent applied by Xiamen University with the publication number CN1312789C uses Celgard2400 as the substrate, and

Method used

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  • High temperature resistant battery diaphragm containing cellulose fiber substrate and preparation method thereof
  • High temperature resistant battery diaphragm containing cellulose fiber substrate and preparation method thereof

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[0052] Example 1

[0053] 1. Preparation of inorganic coatings

[0054] 3g polyvinylidene fluoride and 0.5g polyimide were added to 150gN-methylpyrrolidone and heated and stirred at a temperature of 50° C., and the stirring time was 2 hours. Add 0.5 g of methyl triethoxy silane and 100 g of aluminum oxide (particle size distribution range: D10: 1.5 µm, D50: 2. 5 µm, D97: 3.5 µm) into the above mixture, using ultra-high pressure The nano-homogenizer is homogenized at 100MPa for 0.5h until the particles are completely dispersed in the coating, and then the inorganic coating is prepared.

[0055] 2. Preparation of high temperature resistant lithium ion battery separator

[0056] The diaphragm base material is made of 90% Tencel fiber and 10% cotton fiber (the average diameter of Tencel fiber and cotton fiber is 2 µm, and the aspect ratio is 100). The thickness is 15 µm and the porosity is 80%. The air permeability is 8sec / 100cc. Among them, the phase fibers and tencel fibers need to b...

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Abstract

The invention discloses a high temperature resistant battery diaphragm containing a cellulose fiber substrate and a preparation method thereof. The high temperature resistant battery diaphragm has a thickness of 20-40micrometer, a porosity of 40-60%, and air permeability of 15-30sec/100cc. The diaphragm includes a cellulose fiber substrate, a porous adhesive layer and an inorganic coating. The preparation method includes: subjecting an aqueous polyurethane emulsion to mechanical foaming, conveying a foam glue to a foam bath device, immersing the cellulose fiber substrate by traction into foambath for gluing, and letting the foam glue form the porous adhesive layer on the substrate surface; coating the cellulose fiber substrate and the porous adhesive layer with an inorganic paint, conducting compounding to form an inorganic coating; and performing drying. The high temperature resistant battery diaphragm provided by the invention has the advantages of good imbibition and liquid retention ability, no shrinkage, longitudinal and horizontal hot shrinkage both below 2%, high ion penetrability, low resistance, excellent mechanical properties, and stable electrochemical properties, and can prevent battery short circuit and dendrite piercing.

Description

technical field [0001] The invention relates to a high-temperature-resistant battery separator containing cellulose fiber base material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, lithium-ion battery separator materials are mainly polyolefin separators such as single-layer polypropylene (PP) microporous membranes, single-layer polyethylene (PE) microporous membranes and three-layer PP / PE / PP composite membranes. Mainly dry stretching porogenic method and wet phase separation method. The disadvantages of polyolefin separators are: 1. The polyolefin separator is easy to shrink when heated, which will cause the size of the separator to be unstable, and the positive and negative electrodes will be short-circuited by direct contact; 2. The closed cell temperature and membrane rupture temperature are low. Under normal conditions, a large amount of heat is released inside the battery, causing...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/44
CPCY02E60/10
Inventor 吴如森吴吉岭赵恺张俊玲
Owner TIANJIN YISEN MATERIAL TECH CO LTD
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