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Blend superfine fiber diaphragm for lithium ion battery

A lithium-ion battery and ultra-fine fiber technology, which is used in the field of lithium-ion battery separators and blended ultra-fine fiber separators for high-specific-capacity lithium-ion batteries, can solve the problems of small output and low production efficiency, and achieve a short processing flow. , high strength, the effect of improving the utilization rate of lithium intercalation

Inactive Publication Date: 2015-02-18
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the preparation of ultrafine fiber separators for lithium-ion batteries by electrospinning in existing reports: 1) The output is small and the production efficiency is low. In most cases, the extrusion rate of spinning solution per hole is less than 10ml / h. 0.1-5ml / h; 2) The heat resistance and mechanical properties of electrospun ultrafine fiber separators made of polyvinylidene fluoride and its blended polymers need to be further improved

Method used

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  • Blend superfine fiber diaphragm for lithium ion battery
  • Blend superfine fiber diaphragm for lithium ion battery
  • Blend superfine fiber diaphragm for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) 80 parts by weight of polyvinylidene fluoride with a molecular weight of 350,000, 18 parts by weight of cellulose acetate with a molecular weight of 60,000, and 2 parts of aryl cage silsesquioxane are dissolved in N, N with a weight mixing ratio of 3:7. - in dimethylformamide / acetone composite organic solvent, stir it with a high-speed stirrer to make it completely dissolved to make a uniform and stable spinning solution with a total mass fraction of 13% polyvinylidene fluoride / cellulose acetate;

[0022] (2) The above configuration spinning solution 1 is injected into the microinjector 2, and extruded from the inner channel 31 of the metal nozzle 3 at an extrusion rate of 15ml / h. The spinning solution 1 is connected to the outer channel at the outlet of the nozzle inner channel 31. In 32, the high-speed airflow of 0.15MPa generated by the air compressor 4 meets, and the metal nozzle 3 is connected to the positive electrode 51 of the high-voltage electrostatic genera...

Embodiment 2～11

[0025] Implementation process embodiment 1 is basically the same, but differs to some extent in the processing conditions, as shown in table 1 and table 2:

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Abstract

The invention relates to a blend superfine fiber diaphragm for a lithium ion battery. The blend superfine fiber diaphragm is characterized by comprising polyvinylidene fluoride, cellulose acetate and polyhedral oligomeric silsesquioxane. The polyhedral oligomeric silsesquioxane is one of alkyl silsesquioxane, alkenyl silsesquioxane or aryl silsesquioxane. The blend superfine fiber diaphragm provided by the invention has good hydrophilcity, high strength and excellent thermal size stability; the solution absorbing rate of the blend superfine fiber diaphragm is 300-900 percent, the thermal shrinkage rate of the blend superfine fiber diaphragm is smaller than 5 percent, the specific capacity of a gel polymer lithium ion battery assembled by adopting the blend superfine fiber diaphragm reaches 200-220 mAh.g<-1>, and the lithium intercalation utilization rate of an anode material LiCoO2 can reach above 70 percent.

Description

technical field [0001] The invention relates to a diaphragm for a lithium ion battery, in particular to a blended superfine fiber diaphragm for a lithium ion battery with a high specific capacity, belonging to the field of textile materials. technical background [0002] The emergence of the energy crisis has made people focus more and more on reversible energy materials with high specific energy, light weight, safety and non-toxicity. The research and development of lithium-ion batteries are in line with this trend, and are recognized as the world's The most advanced commercial secondary battery in the world. Compared with traditional lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, fast charging, and low self-discharge rate, etc. Advantages, it has been applied in many high-tech fields such as automobil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/414H01M50/417H01M50/44
CPCH01M10/0525H01M50/411H01M50/44Y02E60/10
Inventor 程博闻康卫民厉宗洁焦晓宁庄旭品闫静赵义侠李磊任元林胡敏
Owner TIANJIN POLYTECHNIC UNIV
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