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Porous dickite coated non-woven lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and dickite technology, which is applied in the field of power-type lithium-ion battery separators and their preparation, can solve the problems of unfavorable battery internal resistance, reduction of battery high-current charge and discharge, insufficient liquid absorption, low porosity, etc. The effect of improving cycle stability, improving electrical conductivity, and improving wettability

Active Publication Date: 2018-06-19
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, the micropore size of the nanoparticle coating structure is too small, the porosity is low, and the liquid absorption capacity is insufficient, which limits the further improvement of the lithium ion mobility, which is not conducive to the reduction of the internal resistance of the battery and the high current charge and discharge of the battery. At the same time, the use of nano fillers also increases the cost of the product

Method used

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  • Porous dickite coated non-woven lithium ion battery diaphragm and preparation method thereof
  • Porous dickite coated non-woven lithium ion battery diaphragm and preparation method thereof

Examples

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preparation example Construction

[0019] a. Preparation of porous dickite

[0020] Dickite and a certain proportion of urea are pulverized in a pulverizer for 5 to 20 minutes, so that the particle size is less than 270 mesh, and the mass of urea is 10 to 25 wt% of the dickite mass. The mixture is placed in an open glass container and placed in a microwave oven. Heat it on medium-high heat for 10-20 minutes, and then put it in an oven at 70°C for 50 hours. Then mix and grind the mixture with potassium chlorate for 40 minutes, the consumption of potassium chlorate is 4% of dickite mass. Finally, the mixture mixed with potassium chlorate was put into an electric furnace at 550° C. for 15 seconds and calcined to obtain a porous stone powder.

[0021] b. Preparation of Porous Dictite / PET Separator

[0022] After uniformly mixing porous ground stone with binder, water, and modifier in a mass ratio of 60-80:33-13:5:2, the coating slurry is obtained by stirring in a homogenizer for 1-2 hours , and then immerse the ...

Embodiment 1

[0024] a. dickite and a certain proportion of urea are pulverized in a pulverizer for 10 minutes, so that the particle size is less than 270 mesh, and the quality of urea is 10wt% of the dickite quality;

[0025] b. Put the mixture in an open glass container, heat it in a microwave oven for 17 minutes, and then put it in an oven at 70°C for 50 hours;

[0026] c. the mixture was mixed with potassium chlorate and ground for 40 minutes, and the consumption of potassium chlorate was 4% of dickite quality;

[0027] d. Put the mixture mixed with potassium chlorate into an electric furnace at 550°C for 15 seconds and calcinate to obtain porous ground stone powder;

[0028] e. After uniformly mixing porous ground stone with binder, water, and modifier in a mass ratio of 80:13:5:2, stir in a homogenizer for 1 hour to obtain a coating slurry;

[0029] f. Immerse the PET non-woven fabric in the coating slurry for 30 minutes, then take it out and dry it in a vacuum oven at 40° C. to obta...

Embodiment 2

[0032] a. dickite and a certain proportion of urea were pulverized in a pulverizer for 15 minutes, so that the particle size was less than 270 mesh, and the quality of urea was 15wt% of the dickite quality;

[0033] b. Put the mixture in an open glass container, heat it in a microwave oven for 15 minutes, and then put it in an oven at 70°C for 50 hours;

[0034] c. the mixture was mixed with potassium chlorate and ground for 40 minutes, and the consumption of potassium chlorate was 4% of dickite quality;

[0035] d. Put the mixture mixed with potassium chlorate into an electric furnace at 550°C for 15 seconds and calcinate to obtain porous ground stone powder;

[0036] e. After uniformly mixing porous ground stone with binder, water, and modifier in a mass ratio of 70:23:5:2, stir in a homogenizer for 2 hours to obtain a coating slurry;

[0037] f. Immerse the PET non-woven fabric in the coating slurry for 30 minutes, then take it out and dry it in a vacuum oven at 40° C. to ...

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Abstract

The invention relates to a porous dickite coated non-woven lithium ion battery diaphragm and a preparation method thereof, and belongs to the field of diaphragm materials. The method is as follows: firstly preparing porous dickite powder having through pores and a pore size in the range of 0.1 to 1 mu m, using the powder as a coating material to mixing with a binder, a modifier and water to prepare coating slurry, and coating the surface of a PET nonwoven fabric with the coating slurry by a dipping method to form a lithium ion battery composite diaphragm. The method utilizes the unique pore structure feature of porous dickite to construct a uniform macroporous structure on the surface of a PET non-woven fabric substrate, thereby improving the porosity of the diaphragm; by use of good affinity of the surface functional group of the dickite to an electrolyte, the electrolyte wettability of the composite membrane is improved, the internal resistance of a battery is reduced, and the chargeand discharge cycle stability of the lithium ion battery can be improved. The preparation method has simple preparation method, low equipment requirement, low raw material cost and strong market competitiveness.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and relates to a high-temperature-resistant, power-type lithium-ion battery diaphragm suitable for high-current charging and discharging and a preparation method thereof. Background technique: [0002] With the rapid development of power vehicles, batteries will become the core of future development, and the diaphragm as a core component of batteries is ushering in a new round of development peak. The diaphragm used in the power lithium-ion battery is obviously different from the ordinary lithium-ion battery diaphragm. The former provides power for vehicles such as vehicles and needs to provide higher voltage, greater power and more electricity. Therefore, the diaphragm is proposed higher requirements. For example, the power battery separator should have higher heat resistance, greater air permeability, and better safety performance. At present, commercial lithium batter...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/449H01M50/454H01M50/489H01M50/491H01M50/497
CPCH01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 薛兵刘尧李芳菲徐远俊李冬妮徐航蒋引珊
Owner JILIN UNIV
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