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A diaphragm material for a power lithium battery

A separator material, lithium battery technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of low porosity, uneven pore size distribution, and general mechanical properties of battery separators, and achieve good heat shrinkage, Effects of high porosity, good mechanical properties and temperature resistance

Active Publication Date: 2022-03-22
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used battery diaphragm preparation material is polyethylene, which is prepared by dry method or wet method. The diaphragm prepared by wet method has a small pore size, but it is only suitable for lithium batteries of digital products, while the battery prepared by dry method The diaphragm has low porosity and large pore size, and there are problems such as uneven pore size distribution, general mechanical properties, and poor thermal shrinkage.

Method used

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  • A diaphragm material for a power lithium battery

Examples

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Effect test

Embodiment 1

[0014] A diaphragm material for a power lithium battery, the preparation method of the diaphragm material comprises the following process steps:

[0015] S1: Clean the corn cobs, dry them in an oven until the water content is between 6-9%, crush them, pass through a 45-mesh sieve, and soak them in a sodium hydroxide solution with a mass concentration of 4.0% for 70 minutes. The soaking temperature is 30°C, filter after soaking, dry in an oven at 70°C for 3 hours, send it into a muffle furnace, heat up to 550°C, keep warm for 2 hours, continue to heat up to 620°C, keep warm for 10 minutes, Cool naturally to room temperature, and further grind until the particle size is between 0.4-0.8 microns;

[0016] S2: Weigh 12.5 grams of butyl titanate and place it in a beaker, stir at a speed of 200 rpm, add 33 ml of absolute ethanol to the beaker, continue stirring for 20 minutes, and then add 18 ml of acetic acid-ethanol to the beaker Mix the solution, continue to stir for 40 minutes, ...

Embodiment 2

[0020] A diaphragm material for a power lithium battery, the preparation method of the diaphragm material comprises the following process steps:

[0021] S1: Clean the corn cobs, dry them in an oven until the water content is between 6-9%, crush them, pass through a 52-mesh sieve, and soak them in a sodium hydroxide solution with a mass concentration of 4.3% for 75 minutes. The soaking temperature is 31°C, filter after soaking, dry in an oven at 75°C for 4 hours, send it into a muffle furnace, heat up to 560°C, keep warm for 2.5 hours, continue to heat up to 625°C, keep warm for 12 minutes, Cool naturally to room temperature, and further grind until the particle size is between 0.4-0.8 microns;

[0022] S2: Weigh 12.8 grams of butyl titanate and place it in a beaker, stir at a speed of 210 rpm, add 34 ml of absolute ethanol to the beaker, continue stirring for 25 minutes, and then add 20 ml of acetic acid-ethanol to the beaker Mix the solution, continue to stir for 45 minutes...

Embodiment 3

[0026] A diaphragm material for a power lithium battery, the preparation method of the diaphragm material comprises the following process steps:

[0027] S1: Clean the corn cobs, dry them in an oven until the water content is between 6-9%, crush them, pass through a 60-mesh sieve, and soak them in a sodium hydroxide solution with a mass concentration of 4.5% for 80 minutes. The soaking temperature is 32°C, filter after soaking, dry in an oven at 80°C for 5 hours, send it into a muffle furnace, heat up to 570°C, keep warm for 3 hours, continue to heat up to 630°C, keep warm for 15 minutes, Cool naturally to room temperature, and further grind until the particle size is between 0.4-0.8 microns;

[0028] S2: Weigh 13.0 g of butyl titanate and place it in a beaker, stir at a speed of 220 rpm, add 36 ml of absolute ethanol to the beaker, continue stirring for 30 minutes, and then add 22 ml of acetic acid-ethanol to the beaker Mix the solution, continue to stir for 50 minutes, heat...

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Abstract

The invention relates to the technical field of new material processing, and discloses a diaphragm material for a power lithium battery, in which a polypropylene organic bottom film is impregnated in a dispersion, and the dispersion system contains carbonized corncob materials and nano-scale titanium dioxide, carbonized corncobs The material has a well-developed three-dimensional pore structure, which can be evenly dispersed into the titanium dioxide alcohol solution, and has strong adsorption performance. The polypropylene organic base film is further impregnated to process the diaphragm material of the power lithium battery. The diaphragm prepared by the present invention The material has high porosity, small pore size, good mechanical properties and temperature resistance on the surface, good thermal shrinkage, and high safety in use. When used with power lithium batteries, it has properties such as large capacity, long life, and stable and uniform output. Power equipment provides sufficient energy supply.

Description

technical field [0001] The invention belongs to the technical field of new material processing, and in particular relates to a diaphragm material for a power lithium battery. Background technique [0002] In the lithium-ion battery positive electrode, separator, electrolyte, and negative electrode composition mechanism, the cost of the lithium battery separator accounts for about 1 / 3 of the battery cost. The separator is an electrically insulating film with a porous structure, which is the key inner layer component of the lithium-ion battery. Its main function is to separate the positive and negative poles of the battery to prevent short circuit from direct contact between the two poles; it has the function of allowing ions to pass through freely, and can also block the current conduction in the battery by closing the pores when the battery is overheated. The performance of the separator determines the interface structure and internal resistance of the battery, which directl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/491H01M10/0525
CPCY02E60/10
Inventor 胡伟张德顺李汪洋吴磊何祥燕杨建军张建安陈曼刘久逸吴明元吴庆云彭盼盼孙晓华郭浩朱江森王若愚吴爱平
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL
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