High-strength composite lithium ion battery diaphragm

A technology for ion batteries and lithium composites, which is applied to battery components, circuits, electrospinning, etc., can solve problems such as poor mechanical properties, thermal stability, and electrochemical properties, and achieve reduced agglomeration, good dispersion, and good affinity liquid effect

Inactive Publication Date: 2019-11-12
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a high-strength composite lithium-ion battery diaphragm to solve the problems of poor mechanical properties, thermal stability and electrochemical performance of the existing diaphragm

Method used

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  • High-strength composite lithium ion battery diaphragm
  • High-strength composite lithium ion battery diaphragm
  • High-strength composite lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Accurately weigh 5g TiO 2 Put 5g of KH560 in a beaker, then add 15g of N-N dimethylacetamide and 20g of deionized water, then place the beaker in an ultrasonic machine and heat it to 60°C for 300min. After the ultrasound is finished, filter and dry to obtain the modified TiO 2 .

[0034] 2) Take 0.78g polyacrylonitrile and 0.06g modified TiO prepared in step 1) 2 Add it into 5.16g N-N dimethylacetamide, heat and stir in an oil bath to fully react, and obtain an electrospinning solution with a concentration of 13wt%, wherein TiO 2 The addition amount of 1wt% was then transferred to a syringe and left to stand for several hours to eliminate air bubbles.

[0035] 3) The electrospinning solution prepared in step 2) was spun at a speed of 0.00012 mm / s. After the preparation was completed, the prepared composite fiber was dried in an oven at 60°C for 12 hours, and then it was dried at a temperature of 80°C and The high-strength composite lithium-ion battery diaphragm w...

Embodiment 2

[0037] 1) Accurately weigh 5g TiO 2 Put 5g of KH560 in a beaker, then add 15g of N-N dimethylacetamide and 20g of deionized water, then place the beaker in an ultrasonic machine and heat it to 70°C for 300min. After the ultrasound is finished, filter and dry to obtain the modified TiO 2 .

[0038] 2) Take 0.78g polyacrylonitrile and 0.12g modified TiO prepared in step 1) 2 Add it into 5.16g N-N dimethylacetamide, heat and stir in an oil bath to fully react, and obtain an electrospinning solution with a concentration of 13wt%, wherein TiO 2 The addition amount of 2wt% is then transferred to a syringe and left to stand for several hours to eliminate air bubbles.

[0039] 3) The electrospinning solution prepared in step 2) was spun at a speed of 0.00012 mm / s. After the preparation was completed, the prepared composite fiber was dried in an oven at 60°C for 12 hours, and then it was dried at a temperature of 80°C and The high-strength composite lithium-ion battery diaphragm wa...

Embodiment 3

[0041] 1) Accurately weigh 5g TiO 2 Put 5g of KH560 in a beaker, then add 15g of N-N dimethylacetamide, 20g of deionized water, then place the beaker in an ultrasonic machine and heat it to 60°C for 300min. After the ultrasound is finished, filter and dry to obtain the modified TiO 2 .

[0042] 2) Take 0.78g polyacrylonitrile and 0.18g modified TiO prepared in step 1) 2 Add it into 5.16g N-N dimethylacetamide, heat and stir in an oil bath to fully react, and obtain an electrospinning solution with a concentration of 13wt%, wherein TiO 2 The addition amount of 3wt% was then transferred to a syringe and left to stand for several hours to eliminate air bubbles.

[0043] 3) The electrospinning solution prepared in step 2) was spun at a speed of 0.00012 mm / s. After the preparation was completed, the prepared composite fiber was dried in an oven at 60°C for 12 hours, and then it was dried at a temperature of 80°C and The high-strength composite lithium-ion battery diaphragm was ...

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Abstract

The invention discloses a high-strength composite lithium ion battery diaphragm. TiO2 particles are subjected to surface modification and then dissolved in a polyacrylonitrile solution, TiO2 is successfully grafted to a PAN fiber, then composite blending is performed, and the high-performance lithium ion battery diaphragm is prepared. TiO2 is very stable in the composite diaphragm and an electrolyte system, the chemical resistance and the electrochemical performance of the composite diaphragm can be improved, the specific surface area and the lyophilicity are high, a good channel and a good transport carrier are provided for free shuttling of lithium ions between electrodes, so that the lithium ion battery diaphragm has excellent mechanical properties and thermal stability at high temperature, aging of the diaphragm in the reaction process of the battery is reduced, and meanwhile, the thermal shrinkage performance of the diaphragm is not influenced, so that the safe operation of the battery is ensured. The preparation method is simple and convenient, raw materials are simple and easy to obtain, cost is low, and industrial production is easy.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-strength composite lithium-ion battery diaphragm. Background technique [0002] Under the pressure of the oil crisis and environmental protection, new energy has become the main development direction in the future, and all countries in the world are vigorously developing new energy. In recent years, the lithium battery industry has received strong financial support from countries all over the world. Lithium batteries are gradually replacing traditional batteries such as lead batteries, and have been widely used in new energy vehicles, electronic consumer products (such as mobile phones, computers, smart products, etc.) and storage energy field. From 2012 to 2017, the issuance of the new energy policy led to the "blowout" development of the battery industry, and the rapid development of domestic power battery companies. In 2018, the production and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14D01D5/00D01F1/10D01F6/54D04H3/005D04H3/147
CPCD01D5/003D01D5/0092D04H3/005D04H3/147D01F6/54D01F1/10H01M50/446H01M50/403Y02E60/10
Inventor 陈建李琳刘平唐成玉唐思琪周孝林
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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