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Flame-retardant cellulose diaphragm of lithium battery prepared through electrostatic spinning

A lithium battery diaphragm and flame-retardant cellulose technology, which is applied in lithium batteries, non-aqueous electrolyte batteries, battery pack components, etc., can solve the problems of cellulose being easy to burn, cellulose is insoluble, and restricting direct use

Active Publication Date: 2015-07-01
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

However, because cellulose is insoluble and flammable when exposed to fire, its direct use in the fields of life and industry is greatly limited. Therefore, a new solvent system is developed to derivatize and flame-retardant cellulose. Can expand the application field of cellulose

Method used

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  • Flame-retardant cellulose diaphragm of lithium battery prepared through electrostatic spinning
  • Flame-retardant cellulose diaphragm of lithium battery prepared through electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 5 g of cellulose pulp with a degree of polymerization of 400-1500 is dissolved in a mixed solution of methylmorpholine oxide and water at a volume ratio of 1:1 to form a cellulose solution with a mass fraction of 5%, and 1 g ammonium phosphate, stir well. 2 mL of the mixed solution was taken out and placed in a syringe with a needle inner diameter of 0.6 mm and aluminum foil as a receiving device. The preset spinning conditions were: a fixed voltage of 20 kV, a fixed distance of 10 cm, and a fixed solution flow rate of 2 mL / h. After spinning, the fiber membrane was compacted with a pressure of 10 MPa.

[0016]

Embodiment 2

[0018] 5 g of cellulose pulp with a degree of polymerization of 400-1500 was dissolved in a mixed solution of methylmorpholine oxide and water at a volume ratio of 1:1 to form a cellulose solution with a mass fraction of 5%, and 2 mL of the mixed solution was taken out Placed in a syringe, the inner diameter of the needle is 0.6 mm, and aluminum foil is used as the receiving device. The preset spinning conditions are: a fixed voltage of 20 kV, a fixed distance of 10 cm, and a fixed solution flow rate of 2 mL / h. After spinning, the fiber membrane was compacted with a pressure of 10 MPa. Then configure 1 g of polyimide and 1 g of decabromodiphenyl ether to dissolve in 50 mL of dimethylacetamide to obtain a polymer material flame retardant solution, and apply the polymer material flame retardant solution to the fibers made above on the diaphragm.

[0019]

Embodiment 3

[0021] 15 g of cellulose acetate are dissolved in a mixed solution of dimethylformamide and acetone at a volume ratio of 2:1 to form a cellulose acetate solution with a mass fraction of 15%, and 1 g of ammonium phosphate is added thereto and stirred evenly Finally, 2 mL of the mixed solution was taken out and placed in a syringe with a needle inner diameter of 0.6 mm and aluminum foil as a receiving device. The preset spinning conditions were: a fixed voltage of 27 kV, a fixed distance of 15 cm, and a fixed solution flow rate of 1.5 mL / h. After spinning, the fiber membrane was compacted with a pressure of 10 MPa.

[0022]

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Abstract

The invention discloses a flame-retardant cellulose diaphragm of a lithium battery prepared through electrostatic spinning, belonging to the field of lithium battery materials. The lithium battery diaphragm provided by the invention is a flame-retardant cellulose diaphragm and is prepared by adding a fire retardant in the process of electrostatic spinning or coating the fire retardant in post-treatment. The lithium battery diaphragm has a thickness of 20 [mu] m to 200 [mu] m, air permeability of 5s-700s / 100cc, porosity of 40 to 90%, electrolyte absorptivity of 100 to 1500%, mechanical tensile strength of 3 to 100 MPa, good dimension thermal stability, excellent flame resistance and high security. Moreover, the prepared lithium battery diaphragm has high ion conductivity and excellent electrochemical interface stability; and a lithium battery assembled with the diaphragm has high rate capability and long cycle life. A preparation method for the lithium battery diaphragm is rapid and simple and can easily realize large scale production.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a flame-retardant cellulose diaphragm for lithium batteries. Background technique [0002] Lithium batteries have many advantages such as large specific energy, long cycle life, and no environmental pollution. They are gradually replacing lead-acid batteries, nickel-metal hydride and nickel-cadmium batteries, and are widely used in portable electronic devices. In recent years, the application of lithium batteries in the fields of electric vehicles, hybrid vehicles and energy storage batteries has received great attention. Lithium batteries are mainly composed of four parts: positive and negative electrode materials, electrolyte, diaphragm and battery case. Among them, the separator, as one of the key components of the lithium battery, plays the role of preventing the short circuit of the positive and negative contacts and providing lithium ion transmission channels. The...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/44
CPCH01M10/052H01M50/411H01M50/44Y02E60/10
Inventor 崔光磊张建军徐泉孔庆山岳丽萍刘志宏徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI