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Biomass cellulose porous composite diaphragm used for lithium ion secondary cell

A biomass and composite membrane technology, applied in battery pack parts, circuits, electrical components, etc., to achieve the effects of uniform pore structure and distribution, convenient preparation and high heat resistance

Active Publication Date: 2012-06-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The safety performance of PE diaphragm and PP diaphragm can no longer meet this demand, so polymer diaphragm materials with better heat resistance are needed

Method used

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  • Biomass cellulose porous composite diaphragm used for lithium ion secondary cell
  • Biomass cellulose porous composite diaphragm used for lithium ion secondary cell
  • Biomass cellulose porous composite diaphragm used for lithium ion secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 3.0 g of cellulose and 8.0 g of lithium chloride were added to 89.0 g of N,N-dimethylacetamide and stirred at 25° C. for 24 hours to slowly dissolve to obtain a uniform cellulose solution (3% by mass). Then store the cellulose solution in a refrigerator at 0-5°C. Another 3.0 ml of cellulose solution was taken out for electrospinning, the needle diameter was 1.6 mm, the spinning voltage was 25 kV, the height from the needle tip to the receiving plate was 10 cm, and electrospinning was performed for 4 hours to obtain cellulose with a thickness of 85 microns. nanofibrous membrane. After soaking the film in 3% sodium alginate aqueous solution for 10 minutes, take it out, and after drying in the air, place the film in a roller press with a pressure of 2 MPa for 2 minutes to obtain a composite cellulose nanocomposite with a thickness of 40 microns. Fiber membrane.

Embodiment 2

[0025] Add 5.0 g of cellulose to 95 g of N-methylmorpholine-N-oxide and stir at 25° C. for 3 hours to slowly dissolve to obtain a uniform cellulose solution (5% by mass). Then store the cellulose solution in a refrigerator at 0-5°C. Another 3.0 ml of cellulose solution was taken out for electrospinning, the needle diameter was 1.6 mm, the spinning voltage was 25 kV, the height from the needle tip to the receiving plate was 10 cm, and electrospinning was performed for 4 hours to obtain cellulose with a thickness of 85 microns. nanofibrous membrane. The membrane was soaked in a DMF solution with 2.7% silica nanoparticles and 0.3% vinylidene fluoride and hexafluoropropylene copolymer dissolved in it for 10 minutes. After drying, the membrane was placed on a roller with a pressure of 2 MPa. Stay in the press for 2 minutes to obtain a regenerated cellulose nanofiber membrane with a thickness of 40 microns.

Embodiment 3

[0027] Add 5.0 g of cellulose to 95 g of N-methylmorpholine-N-oxide and stir at 25° C. for 3 hours to slowly dissolve to obtain a uniform cellulose solution (5% by mass). Then store the cellulose solution in a refrigerator at 0-5°C. Another 3.0 ml of cellulose solution was taken out for electrospinning, the needle diameter was 1.6 mm, the spinning voltage was 25 kV, the height from the needle tip to the receiving plate was 10 cm, and electrospinning was performed for 4 hours to obtain cellulose with a thickness of 85 microns. nanofibrous membrane. The film was soaked in a DMF solution of 2.4% silica nanoparticles and 0.6% polyetherimide (Ultem1000) for 10 minutes, taken out, and after drying, the film was placed on a roller with a pressure of 2 MPa Stay in the press for 2 minutes to obtain a regenerated cellulose nanofiber membrane with a thickness of 40 microns.

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Abstract

The invention discloses a cellulose porous membrane able to be used for a lithium ion secondary cell diaphragm. Two side surfaces of the membrane are coated with sodium alginate, a fluorine-containing polymer, polyaryletherketone, polyimide, polynorbornene or inorganic nanoparticles and other structure enhanced and interface stable components. The membrane has thickness of 15-100 micrometers, and air permeability of 2-500s. The upper and lower surfaces as well as inner pores of the membrane are symmetrically and uniformly distributed, with an average pore size of 20-200 nanometers and tensile strength of 50-250MPa. The invention also discloses a preparation method of the cellulose porous membrane. The membrane of the invention can be used as a lithium ion cell diaphragm and has good heat resistance, and even if at a temperature of 150DEG C, a cell short circuit phenomenon cannot occur. Therefore, the cell diaphragm provided in the invention is especially suitable for large capacity and power lithium ion cells. In addition, employment of biomass cellulose that has the largest output in the nature as the raw material for producing the lithium ion cell diaphragm has the advantages of low cost, sustainability and environmental protection.

Description

technical field [0001] The invention relates to a biomass cellulose porous membrane. [0002] The present invention also relates to a method for preparing the above-mentioned cellulose porous membrane. [0003] The present invention also relates to the application of the above-mentioned cellulose porous membrane in lithium-ion secondary batteries. Background technique [0004] Lithium-ion secondary batteries have achieved great development in the past ten years due to their advantages of high specific capacity, high voltage, small size, light weight, and no memory. However, for lithium-ion secondary batteries using liquid electrolytes, in Sometimes, lithium-ion batteries are prone to safety hazards such as smoke, fire, explosion, and even personal injury, which makes high-capacity and power lithium-ion batteries not widely used. Therefore, improving the safety performance of lithium-ion batteries is the key to developing lithium-ion secondary batteries. The key to the batt...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08L97/02H01M2/16
CPCY02E60/12Y02E60/10
Inventor 崔光磊刘志宏孔庆山张建军韩鹏献姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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