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Wood pulp fiber/nanometer barium sulfate composite lithium battery diaphragm paper and preparation method thereof

A lithium battery separator, nano barium sulfate technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc. Wetting and other problems, to achieve the effects of excellent wetting performance, moderate pore size, improved wettability and thermal stability

Pending Publication Date: 2020-01-03
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of separator has two inherent limitations: one is the low porosity
The low porosity caused by its semi-crystalline structure and melt-blown technology hinders the absorption of liquid electrolyte by the separator, making the separator have poor electrolyte wettability, resulting in low rate capability of the battery, and in the interface layer of the separator and electrode Produces high ionic conduction resistance, compromising the safety of Li-ion batteries
Second, poor thermal stability
At present, there are two main methods to prepare lithium battery separators from polyimide resin. One is to interweave polyamide fibers with adhesive to form a porous film, and then coat other materials to fill the pores. This separator has good wettability. , but there are disadvantages such as low membrane strength, large pore size, and high electrolyte permeability
The other is to directly coat polyimide resin to form a membrane. This kind of membrane has high strength, small pore size, narrow distribution range, but poor wettability.

Method used

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  • Wood pulp fiber/nanometer barium sulfate composite lithium battery diaphragm paper and preparation method thereof
  • Wood pulp fiber/nanometer barium sulfate composite lithium battery diaphragm paper and preparation method thereof
  • Wood pulp fiber/nanometer barium sulfate composite lithium battery diaphragm paper and preparation method thereof

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Effect test

Embodiment 1

[0052] A kind of preparation method of wood pulp fiber / nano barium sulfate composite lithium battery separator paper, its steps are as follows:

[0053] (1) Mix the virgin softwood pulp fiber of 50% by mass and the hardwood pulp of 50% by mass that have been disintegrated, and carry out high-viscosity beating treatment to obtain mixed wood pulp with a beating degree of 80 ° SR Fiber slurry; the paper preparation process of high-density tissue paper is used to prepare a basis weight of 30g / m 2 fiber base paper.

[0054] (2) Mix 50% by mass of nanofibers (30±5nm in diameter, 50±5:1 aspect ratio) and 50% by mass of nanobarium sulfate composite material (30±5nm in diameter), and coat On both sides of the fiber base paper in step (1), the coating amount is 18g / m 2 , and use a hot press machine to carry out hot pressing and drying under the conditions of a temperature of 120 ° C and a pressure of 5 MPa to obtain a semi-finished lithium battery separator paper.

[0055] (3) dissol...

Embodiment 2

[0061] A kind of preparation method of wood pulp fiber / nano barium sulfate composite lithium battery separator paper, its steps are as follows:

[0062] (1) Carry out high-viscosity beating treatment to the original coniferous wood pulp fiber that has been decomposed, and the mixed wood pulp fiber slurry that the degree of beating is obtained is 80 ° SR; The paper preparation process of high-density tissue paper is used to prepare quantitatively 30g / m 2 fiber base paper.

[0063] (2) Mix 50% by mass of nanofibers (30±5nm in diameter, 50±5:1 aspect ratio) and 50% by mass of nano barium sulfate composite material (30±5nm in diameter), and coat On both sides of the fiber base paper in step (1), the coating amount is 18g / m 2 , and use a hot press machine to carry out hot pressing and drying under the conditions of a temperature of 120 ° C and a pressure of 5 MPa to obtain a semi-finished lithium battery separator paper.

[0064] (3) dissolving the polyimide resin with a dioxan...

Embodiment 3

[0070] A kind of preparation method of wood pulp fiber / nano barium sulfate composite lithium battery separator paper, its steps are as follows:

[0071] (1) Carry out high-viscosity beating treatment to the original hardwood pulp fiber that has been disintegrated, and the obtained beating degree is 80 ° SR, fiber slurry; the prepared fiber slurry adopts the paper preparation process of high-density tissue paper The preparation quantity is 30g / m 2 fiber base paper.

[0072] (2) Mix 50% by mass of nanofibers (30±5nm in diameter, 50±5:1 aspect ratio) and 50% by mass of nano barium sulfate composite material (30±5nm in diameter), and coat On both sides of the fiber base paper in step (1), the coating amount is 18g / m 2 , and use a hot press machine to carry out hot pressing and drying under the conditions of a temperature of 120 ° C and a pressure of 5 MPa to obtain a semi-finished lithium battery separator paper.

[0073] (3) dissolving the polyimide resin with a dioxane solven...

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Abstract

The invention relates to wood pulp fiber / nanometer barium sulfate composite lithium battery diaphragm paper and a preparation method thereof. According to the invention, wood pulp fiber is used as a raw material; fiber base paper is prepared by using a paper preparation process in a high-beating-degree viscous beating manner; a mixed coating is prepared from a nanometer fiber-nanometer barium sulfate composite and uniformly coats the two sides of the base paper; then treatment in a hot-pressing drying manner is performed; dipping with in a polyimide resin solution is carried out; and finally,drying is performed to obtain the lithium battery diaphragm paper. The preparation method is mature and simple in process and uses environment-friendly raw materials; the nanometer fiber-nanometer barium sulfate composite is used as the coating, large pores of the diaphragm base paper is filled, and good wettability and high-temperature stability are achieved; and since the polyimide resin is usedas a diaphragm outer layer, the long-time high-temperature thermal stability of the lithium battery diaphragm is improved. The lithium battery diaphragm paper prepared by using the method is novel and environment-friendly in material and convenient for industrial production.

Description

technical field [0001] The invention relates to a wood pulp fiber / nano-barium sulfate composite material lithium battery separator paper and a preparation method thereof, in particular to a wood pulp fiber with excellent wettability, high thermal stability, high film strength, simple process, environmental protection and pollution-free The invention relates to lithium battery diaphragm paper of nanometer barium sulfate composite material and a preparation method thereof, belonging to the technical field of papermaking and battery. Background technique [0002] With the rapid development of science and technology, battery applications are becoming more and more extensive. Due to its high energy density, stable cycle characteristics, low discharge rate and high operating voltage, lithium batteries have been successfully used in portable electronic devices such as mobile phones, computers and cameras, and are expected to be used in electric vehicles and energy storage systems. ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411H01M50/431H01M50/44Y02E60/10
Inventor 赵传山李辉李杰华韩文佳姜亦飞
Owner QILU UNIV OF TECH
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