Preparation method of high-performance cellulose-based lithium ion battery diaphragm

A lithium-ion battery and cellulose-based technology, applied in cellulose/protein conjugated artificial filaments, secondary batteries, battery components, etc., can solve the problems of poor mechanical strength of cellulose membranes and achieve thermal stability Good, inhibit transmission, improve thermal stability

Active Publication Date: 2021-11-23
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat-resistant temperature of the cellulose separator can reach above 230°C, and it has the characteristics of good wettability to the electrolyte and high liquid absorption rate. However, the mechanical strength of the cellulose membrane is poor, and the existing cellulose separator still has certain problems.
Therefore, it is still a great challenge to design and prepare a high-performance cellulose-based lithium-ion battery separator.

Method used

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  • Preparation method of high-performance cellulose-based lithium ion battery diaphragm
  • Preparation method of high-performance cellulose-based lithium ion battery diaphragm
  • Preparation method of high-performance cellulose-based lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of a high-performance cellulose-based lithium-ion battery diaphragm, comprising the following steps:

[0032] (1) Preparation of UIO-67 nanoparticles

[0033] Dissolve 7.5 g of zirconium chloride, 7.8 g of 4,4'-biphenyldicarboxylic acid, and 93 mL of acetic acid in 500 mL of N,N-dimethylformamide and 75 mL of H 2 In the mixed solution of O, heat to 110°C, stir and react for 60 minutes, after the reaction, cool to room temperature, centrifuge at 8000r / min for 5 minutes, collect the solid product, wash with water and ethanol, and obtain UIO-67nm particle.

[0034] (2) Preparation of CA / PU / UIO-67 separator

[0035] S1. Ultrasonic dispersion of UIO-67 nanoparticles in DMF / acetone mixed solvent, the volume ratio of DMF and acetone is 8:2, and the mass fraction of UIO-67 nanoparticles is 0.6wt%;

[0036] S2. Add CA and PU with a mass ratio of 7:3 to the dispersion prepared in step S1, stir at room temperature for 24 hours, and the mass fraction of CA a...

Embodiment 2

[0040] A method for preparing a high-performance cellulose-based lithium-ion battery diaphragm, the preparation of UIO-67 nanoparticles is the same as in Example 1, and the preparation of CA / PU / UIO-67 diaphragm includes the following steps:

[0041] S1. Ultrasonic dispersion of UIO-67 nanoparticles in DMF / acetone mixed solvent, the volume ratio of DMF and acetone is 7:3, and the mass fraction of UIO-67 nanoparticles is 0.8wt%;

[0042] S2. Add CA and PU with a mass ratio of 7:3 to the dispersion prepared in step S1, stir at room temperature for 12 hours, and the mass fraction of CA and PU is 8wt%;

[0043] S3. Transfer the dispersion obtained in step S2 to a plastic syringe, and perform electrospinning in an air atmosphere to obtain an electrospun film; dry the electrospun film under vacuum conditions to remove residual organic solvents in the film, A CA / PU / UIO-67 diaphragm was obtained. The parameters of the electrospinning process were set as follows: the distance between t...

Embodiment 3

[0046] A method for preparing a high-performance cellulose-based lithium-ion battery diaphragm, the preparation of UIO-67 nanoparticles is the same as in Example 1, and the preparation of CA / PU / UIO-67 diaphragm includes the following steps:

[0047]S1. Ultrasonic dispersion of UIO-67 nanoparticles in DMF / acetone mixed solvent, the volume ratio of DMF and acetone is 7.5:2.5, and the mass fraction of UIO-67 nanoparticles is 0.75wt%;

[0048] S2. Add CA and PU with a mass ratio of 7:3 to the dispersion prepared in step S1, stir at room temperature for 18 hours, and the mass fraction of CA and PU is 7.5wt%;

[0049] S3. Transfer the dispersion obtained in step S2 to a plastic syringe, and perform electrospinning in an air atmosphere to obtain an electrospun film; dry the electrospun film under vacuum conditions to remove residual organic solvents in the film, A CA / PU / UIO-67 diaphragm was obtained. The parameters of the electrospinning process were set as follows: the distance bet...

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Abstract

The invention discloses a preparation method of a high-performance cellulose-based lithium ion battery diaphragm, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: dispersing UIO-67 nanoparticles in an organic solvent, adding cellulose acetate (CA) and polyurethane (PU), and preparing a CA / PU / UIO-67 diaphragm by adopting an electrostatic spinning process. The CA / PU / UIO-67 diaphragm prepared by the method provided by the invention has the advantages of high lithium ion transference number, good thermal stability, uniform pore size distribution, smaller pore size and the like, and can effectively delay the nucleation rate of lithium dendrites and improve the electrochemical performance of a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a high-performance cellulose-based lithium ion battery diaphragm. Background technique [0002] Lithium-ion batteries are a very promising and important energy storage technology. Separator is a key component of lithium-ion batteries. Although the separator does not directly participate in the electrochemical reaction of the battery, its performance and structure play a key role in affecting the performance of the battery, including energy density, power density, safety and service life. Many factors should be considered when selecting a suitable separator for use in Li-ion batteries. Existing lithium-ion battery separators usually use polyolefins such as polyethylene and polypropylene. However, the shortcomings of polyolefin separators are also obvious, and it is difficult for them to meet the requirements of future development...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/44H01M50/411H01M10/0525D01F8/02D01F8/16D04H1/4258D04H1/4358D04H1/728
CPCH01M50/403H01M50/44H01M50/411H01M10/0525D04H1/728D04H1/4258D04H1/4358D01F8/02D01F8/16Y02E60/10
Inventor 付宇王永勤
Owner NANJING FORESTRY UNIV
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