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Composite ceramic porous lithium battery diaphragm, preparation method and application of composite ceramic porous lithium battery diaphragm

A composite ceramic and diaphragm technology, applied in lithium batteries, circuits, electrical components, etc., can solve the problems of reduced stability of lithium battery diaphragms, short circuit of positive and negative electrodes of lithium batteries, uneven or unequal coating, and reduce battery short circuit phenomenon. , The effect of improving production efficiency and low cost

Inactive Publication Date: 2018-11-16
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the traditional ceramic lithium battery diaphragm is coated with a coating containing ceramic particles on one side or both sides of the diaphragm substrate, the coating process requires stricter requirements, because it is very easy to cause poor coating when coating the ceramic particles. Even or uneven phenomenon, this defect will easily lead to a decrease in the stability of the lithium battery separator at high temperatures
Since lithium batteries are widely used in mobile phones, computers, electric vehicles and other fields, the voltage and capacity of lithium batteries continue to increase, and there are higher requirements for the high-temperature stability of lithium battery separators, while traditional ceramic lithium battery separators work at high temperatures. , the coated ceramic particles are easy to fall off, resulting in a short circuit between the positive and negative electrodes of the lithium battery, resulting in serious safety accidents

Method used

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  • Composite ceramic porous lithium battery diaphragm, preparation method and application of composite ceramic porous lithium battery diaphragm
  • Composite ceramic porous lithium battery diaphragm, preparation method and application of composite ceramic porous lithium battery diaphragm
  • Composite ceramic porous lithium battery diaphragm, preparation method and application of composite ceramic porous lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh and mix the raw materials in the following weight ratio: 30% polyethylene with an average molecular weight of 1.2 million, 55% kerosene, octadecyl-3-(3,5-di-tert-butyl-4-hydroxybenzene Base) 8% acrylate, 7% ceramic particles with a particle size of 10nm.

[0022] (2) Pass the mixed raw materials through a twin-screw extruder at 180°C to obtain a high-temperature melt. The high-temperature melt is accurately metered by a melt pump and then sent to the die, and the high-temperature melt fed into the die passes through the slit of the die The high-temperature melt flowing out from the slit of the die passes through the chilled roll to obtain extruded cast pieces;

[0023] (3) extruding the cast sheet and entering the bidirectional synchronous stretching machine to obtain an oily film with a longitudinal ratio of 4 times and a transverse ratio of 5 times;

[0024] (4) After fully immersing the oil-containing diaphragm in dichloromethane for 15 minutes, remove the...

Embodiment 2

[0029] According to the process of Example 1, the raw materials and their proportions are changed, and other process conditions remain unchanged. The specific raw materials and proportions are as follows: 25% of polyethylene with an average molecular weight of 1.3 million, 60% of paraffin oil, pentaerythritol-tetra-[3- (3,5-di-tert-butyl-4-hydroxyphenyl) acrylate] 8%, ceramic particles with a particle size of 20nm 7%.

[0030] After testing, the pore diameter of the composite ceramic porous lithium battery separator is 110nm. The porosity and air permeability of the separator material of the present invention were measured, and the shrinkage rate was tested after being heated at 105° C. and 130° C. for 1 hour respectively. The results are shown in Table 2.

[0031] Table 2

[0032]

Embodiment 3

[0034] According to the process of Example 1, the raw materials and their proportions are changed, and other process conditions remain unchanged. The specific raw materials and proportions are as follows: 25% polyethylene with an average molecular weight of 1.3 million, 60% white oil, 2,6-di-tert-butyl Base-4-methylphenol 8%, ceramic particles with a particle size of 30nm 7%.

[0035] After testing, the pore diameter of the composite ceramic porous lithium battery diaphragm is 130nm. The porosity and air permeability of the separator material of the present invention were measured, and their shrinkage rates were tested after being heated at 105° C. and 130° C. for 1 hour respectively. The results are shown in Table 3.

[0036] table 3

[0037]

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Abstract

The invention discloses a composite ceramic porous lithium battery diaphragm, a preparation method and application of the composite ceramic porous lithium battery diaphragm. 18-35% of polyethylene, 50-60% of a pore-forming agent, 5-8% of an antioxidant and 3-8% of ceramic particles are served as raw materials, by a process for preparing the diaphragm with a wet method, nanoscale ceramic diaphragmsare uniformly added in the raw material preparing process, the diaphragms are squeezed out and stretched together with a polyethylene raw material, an organic solvent is adopted to dip and remove thepore-forming agent so as to form a diaphragm with a porous structure, and finally the composite ceramic porous lithium battery diaphragm is obtained after using a sizing process. The composite ceramic porous lithium battery diaphragm is completed once by adopting a wet method diaphragm process and ceramic particle mixing, the processing cost of the ceramic diaphragm is greatly reduced, and meanwhile, the high-temperature stability of the lithium battery diaphragm is improved.

Description

technical field [0001] The invention relates to the field of a ceramic lithium battery separator. Specifically, it relates to a composite ceramic porous lithium battery separator, a preparation method and an application thereof. Background technique [0002] Since the traditional ceramic lithium battery diaphragm is coated with a coating containing ceramic particles on one side or both sides of the diaphragm substrate, the coating process requires stricter requirements, because it is very easy to cause poor coating when coating the ceramic particles. Even or uneven phenomenon, this defect easily leads to a decrease in the stability of the lithium battery separator at high temperatures. Since lithium batteries are widely used in mobile phones, computers, electric vehicles and other fields, the voltage and capacity of lithium batteries continue to increase, and there are higher requirements for the high-temperature stability of lithium battery separators, while traditional ce...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052
CPCH01M10/052H01M50/403H01M50/446Y02E60/10
Inventor 徐锋李艳艳袁海朝苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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