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Preparation method of cellulose diaphragm

A cellulose diaphragm and cellulose technology, applied in the field of preparation of cellulose diaphragm, can solve the problems of increasing the production cost of lithium battery diaphragm, insufficient wetting of electrolyte, affecting the stability of battery rate, etc., to achieve good cycle performance, thermal Good shrinkage performance and good immersion performance

Active Publication Date: 2019-05-10
JIANGXI TONRY NEW ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the hydrophobic nature of the polyolefin separator leads to insufficient wetting of the electrolyte, which affects the ion transport between the separators and affects the rate stability of the battery.
Although the existing coated separator has improved its thermal shrinkage and liquid immersion performance to a certain extent, it also greatly increases the production cost of the lithium battery separator.

Method used

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  • Preparation method of cellulose diaphragm
  • Preparation method of cellulose diaphragm
  • Preparation method of cellulose diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The diaphragm provided in this example is a diaphragm prepared from lignin as a raw material and water as a diluent. The thickness of the diaphragm is 12 microns, the porosity is 52%, the rupture temperature is 185°C, and the heat shrinkage is 1% in MD and 0.5% in TD.

[0040] The diaphragm provided in this embodiment is prepared according to the following steps:

[0041] Put 2kg of lignin fibers into 3kg of water, and stir for 15min at a speed of 10000rpm until the cellulose is suspended and dispersed in the water. Pour the suspension into the extruder 1, extrude through the die, cast onto the peelable casting carrier 2, and then filter through the suction filtration device 3 to extract the water to form a film, and at the same time control its thickness , then enter the drying equipment 4, dry under the conditions of 93°C and 0.5Mpa, and then carry out the winding operation through the winding equipment 5, and then cut through the first scraper 6 and the second scrape...

Embodiment 2

[0043] The diaphragm provided in this example is a diaphragm prepared with microfibrillated cellulose as a raw material and ethanol as a diluent. The thickness of the diaphragm is 16 microns, the porosity is 55%, the rupture temperature is 200° C., and the thermal shrinkage MD is 1%, TD0. 5%.

[0044] The diaphragm provided in this embodiment is prepared according to the following steps:

[0045] Put 3.5kg of lignin fibers into 1.5kg of water, and stir for 20min at a speed of 12000rpm until the cellulose is suspended and dispersed in the water. Pour the suspension into the extruder, extrude it through the die, and cast it on the peelable carrier, then filter it with suction, draw out the water, form a film, and control its thickness at the same time, then enter the dryer, ℃, 1Mpa conditions, and finally get the 16 micron membrane we want.

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Abstract

The present invention relates to a preparation method of cellulose diaphragm, the method comprises following steps: (1) mixing cellulose and diluent in a weight ratio of 40:60 to 90:10 to prepare a mixture solution; and (2) feeding the mixture solution prepared in the step (1) to a mixing machine, in a normal temperature, and at a rotating speed of 1000 rpm, stirring for 15 to 20 minutes to form asuspension solution; (3) putting the suspension solution obtained in the step (2) into an extruder, performing extrusion, casting, and suction filtration; (4) sending filtered diaphragm in the step (3) to an oven, drying under condition of 90 to 100 degree Celsius, and 0.1 to 1 MPa, and finally winding to obtain the diaphragm desired to prepare. The cellulose diaphragm has good immersion liquidity, sufficient infiltration of electrolyte on surface of the diaphragm, reduces internal resistance of a lithium ion battery, and make the battery have good cycle performance and high charge and discharge performance; the fiber of the present application The membrane has a high membrane rupture temperature, which is beneficial to improve the safety performance of the battery. The cellulose diaphragm has a high diaphragm rupture temperature, and is beneficial to improve safety performance of the battery.

Description

technical field [0001] The invention relates to the technical field of diaphragm production, in particular to a preparation method of a cellulose diaphragm. Background technique [0002] Cellulose is a macromolecular polysaccharide composed of glucose. Insoluble in water and general organic solvents. It is the main component of plant cell wall. Cellulose is the most widely distributed and most abundant polysaccharide in nature, accounting for more than 50% of the carbon content in the plant kingdom. The cellulose content of cotton is close to 100%, making it the purest natural source of cellulose. In general wood, cellulose accounts for 40-50%, and there are 10-30% hemicellulose and 20-30% lignin. [0003] Cellulose is one of the main chemical components in pulp and paper. The special paper produced from cellulose has many excellent properties, such as high dielectric constant, strong puncture resistance, good chemical stability, good thermal stability, and degradation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16B01D67/00B01D69/02B01D71/10C02F1/44H01M50/403H01M50/44H01M50/489
CPCY02E60/10
Inventor 程跃熊磊傅尧
Owner JIANGXI TONRY NEW ENERGY TECH DEV CO LTD