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
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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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