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Lithium-ion battery diaphragm and preparation method thereof

A technology for lithium-ion batteries and diaphragms, applied in the field of lithium-ion battery diaphragms and their preparation, can solve the problems of difficult electrolyte adsorption and heat shrinkage resistance of battery diaphragms, and achieve improved overall performance, improved heat shrinkage resistance, and enhanced The effect of stability

Inactive Publication Date: 2017-05-31
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current inorganic coatings, there have been many studies and reports on the types of inorganic particles, but the inventors of the present application have found that there are few researches on the matching between the particle size and the morphology of the inorganic particles as the coating. As for the prepared battery separator, it is difficult to improve the adsorption performance and thermal shrinkage resistance of the electrolyte at the same time.

Method used

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  • Lithium-ion battery diaphragm and preparation method thereof
  • Lithium-ion battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In this example, irregular-shaped alumina with a D50 of 600nm and flaky alumina with a D50 of 100nm are used to prepare a battery separator from two types of inorganic particles; the irregular-shaped alumina accounts for 40% of the total weight of the inorganic particles, and the sheet Granular alumina accounts for 60% of the total weight of the inorganic particles. The base membrane of this example is a high-density polypropylene microporous membrane with a thickness of 16 microns and a pore diameter of 30-35 nm.

[0028] The specific preparation method of the battery separator in this example is as follows:

[0029] (1) Pour 0.3% of the total weight of the water-based slurry into the dispersant polyoxyethylene ether and water into the mixing tank, stir and mix for 30 minutes, and disperse by revolution at 60 RPM;

[0030] (2) Add 40% of the total weight of the water-based slurry to the inorganic particles, stir and mix for 2 hours, 60RPM revolution, 1200RPM rotation ...

Embodiment 2

[0035] In this example, flaky alumina with a D50 of 600nm and ellipsoidal alumina with a D50 of 100nm are used to prepare battery separators. The flaky alumina accounts for 40% of the total weight of the inorganic particles, and the ellipsoidal alumina Aluminum accounts for 60% of the total weight of the inorganic particles. All the other are the same as the first embodiment.

Embodiment 3

[0037] In this example, ellipsoidal alumina with a D50 of 400nm and irregular alumina with a D50 of 100nm are used to prepare battery separators. The ellipsoidal alumina accounts for 40% of the total weight of the inorganic particles, and the irregular Formed alumina accounts for 60% of the total weight of the inorganic particles. All the other are the same as the first embodiment.

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Abstract

The invention discloses a lithium-ion battery diaphragm and a preparation method thereof. The lithium-ion battery diaphragm disclosed by the invention comprises a base membrane and an inorganic particle coating coated on one side or two sides of the base membrane, wherein the inorganic particle coating is composed of at least two kinds of inorganic particles in different morphologies and different grain sizes; the morphologies of the inorganic particles are not repeatedly selected from sphere, ellipsoid, dumb-bell, sheet or irregular shapes; and the grain sizes of the inorganic particles are not repeatedly selected from micron-scale particles, submicron-scale particles or nanometer-scale particles. In the lithium-ion battery diaphragm disclosed by the invention, the inorganic particles in different morphologies and different grain sizes are formed into the inorganic particle coating; on the one hand, the stability of the inorganic particle coating is enhanced, so that the heat-resistant contractility of the lithium-ion battery is promoted; on the other hand, the adsorptive property of the battery diaphragm to the electrolyte is improved; the overall performance of the battery diaphragm is promoted; and the basis is established for the preparation of a high-quality lithium-ion battery.

Description

Technical field [0001] The present application relates to the field of lithium-ion battery separators, and in particular to a lithium-ion battery separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect and long cycle life. In lithium-ion batteries, the main function of the separator is to separate the positive and negative electrodes of the battery and prevent the two electrodes from contacting and causing a short circuit. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the energy density, cycle and safety performance of the battery. [0003] At present, separators for lithium-ion batteries are generally polyolefin-based porous films. When the battery temperature rises, especially when the temperature is 200°C, this sepa...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/409H01M50/449Y02E60/10
Inventor 刘建金张胜刚王会娜樊孝红刘其才
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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