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Preparation method of lithium battery membrane

A lithium battery separator and porous film technology, applied in the field of lithium battery separator preparation, can solve the problems of reducing battery volume specific energy, increasing the weight and thickness of the separator, etc. Effect

Inactive Publication Date: 2017-01-04
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods improve the heat resistance of the separator and the wettability with the electrolyte to a certain extent, they greatly increase the weight and thickness of the separator, thereby reducing the volume specific energy of the battery.

Method used

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  • Preparation method of lithium battery membrane
  • Preparation method of lithium battery membrane
  • Preparation method of lithium battery membrane

Examples

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Effect test

preparation example Construction

[0020] The embodiment of the present invention discloses a preparation method of a lithium battery diaphragm, which includes the following steps: adding a precursor compound, a structure-directing agent and hydrochloric acid into the first mixed solution, stirring, and obtaining a sol after alcoholysis reaction, and the first mixed solution The solution includes ethanol and water, and the precursor compound is selected from one or more of ethyl orthosilicate, methyl orthosilicate, silicon tetrachloride, titanium tetrachloride and n-butyl titanate, the The structure-directing agent is a block copolymer; the sol is coated on the surface of the porous membrane, cleaned, and the lithium battery separator after hot-air drying.

[0021] In the present invention, the porous membrane is used as the base membrane, ethyl orthosilicate, methyl orthosilicate, silicon tetrachloride, titanium tetrachloride and n-butyl titanate are used as precursors, and the block copolymer is used as a stru...

Embodiment 1

[0033] Dissolve 126g of F127 in a mixed solution of 1150ml of ethanol and 360ml of water at 60°C, wait until F127 is completely dissolved, add 110ml of tetraethyl orthosilicate, adjust the pH of the solution to 2-3 by adding hydrochloric acid, and the concentration of HCl in hydrochloric acid is 0.5M , Continue stirring for 2h to complete the reaction to obtain the sol.

[0034] The above-mentioned sol is coated on the PE film by dip coating. The porosity of the PE film is 60%, the average pore diameter is 80nm, the thickness is 20μ, the coating speed is 1m / min, and the surface gel is removed by washing with a mixed solvent of ethanol and water. Dry with hot air at 80°C to obtain a coated separator.

[0035] Carry out SEM analysis to the coating diaphragm that the embodiment of the present invention prepares, as figure 1 Shown is the SEM image of the high-performance interpore coated diaphragm prepared in Example 1.

Embodiment 2

[0037] Dissolve 250g of F127 in a mixed solution of 1200ml of ethanol and 900ml of water at 60°C, wait until F127 is completely dissolved, add 220ml of tetraethyl orthosilicate to the solution, adjust the pH value of the solution to 2-3 by adding hydrochloric acid, the concentration of HCl in hydrochloric acid 1M, and then continue to stir for 2h to complete the reaction to obtain the sol.

[0038] The above-mentioned sol is coated on the PE base film by dip coating. The porosity of the PE film is 60%, the average pore diameter is 80nm, the thickness is 20μ, the coating speed is 1m / min, and the surface gel is removed by washing with a mixed solvent of ethanol and water. , 80 ° C hot air drying to obtain a coated separator.

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Abstract

The invention provides a preparation method of a lithium battery membrane. The preparation method includes: adding a precursor compound, a structure directing agent and hydrochloric acid into a first mixed solution, stirring, and allowing alcoholysis reaction to obtain sol; coating the sol on the surface of a porous membrane, washing, and using hot air to dry to obtain the lithium battery membrane. The porous membrane is used as a base membrane, tetraethoxysilane, tetramethyl orthosilicate, silicon tetrachloride, titanium tetrachloride and tetrabutyl titanate are used as precursors, segmented copolymer is used as the structure directing agent, and an inorganic compound resistant to high temperature is coated among pores of the porous membrane, so that heat resistance of the membrane is improved effectively. Wettability of the membrane coated among the pores to electrolyte is improved obviously, and liquid absorbing and retaining performance is improved greatly; increase in thickness and weight of the lithium battery membrane prepared by utilizing an inter-porous coating method is small, and increasing of volumetric specific energy of batteries is facilitated. Experiment results show that the lithium battery membrane has high heat resistance and wettability to the electrolyte and is small in thickness.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium battery diaphragm. Background technique [0002] With the development of information technology, our demand for mobile power is also growing rapidly. At the same time, compared with traditional batteries, the direction of demand has also changed: high energy, small size, light weight, and high safety performance have become mobile batteries. The new direction of power development. Lithium-ion batteries have become the first choice for many portable electronic devices and electric vehicles due to their high energy density, long cycle life, safety and pollution-free, and fast charging and discharging performance. Lithium-ion batteries include electrodes, electrolytes, battery separators, etc., and the separator between the two electrodes plays a very important role. It not only separates the two poles, so that the battery will not be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/446Y02E60/10
Inventor 谭斌陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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