A kind of cross-linked composite lithium-ion battery separator based on cellulose acetate and its preparation method and application
A technology of cellulose acetate and lithium-ion batteries, which is applied in the direction of secondary batteries, battery components, circuits, etc., and can solve the problems of not meeting the requirements of high-performance lithium-ion batteries, sustainable development, and non-renewability , to achieve the effects of increasing absorption, increasing porosity, and increasing electrical conductivity
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Embodiment 1
[0043] Example 1: Preparation of methacryloyl chloride modified cellulose acetate (M-CA)
[0044] Drying of cellulose acetate: At 120 ºC, cellulose acetate (with a hydroxyl content of 3.5 wt %, Aladdin) were dried in an oven for 6 h.
[0045] Preparation of methacryloyl chloride-modified cellulose acetate (M-CA): Weigh 3.0 g of dry cellulose acetate, dissolve it in the organic solvent N, N`-dimethylacetamide (DMAc), add 2.5 g of three Ethylamine (TEA) was repeatedly filled and discharged with nitrogen three times to remove the air and moisture in the system; then, under nitrogen atmosphere, 2.6 g of methacryloyl chloride was slowly added dropwise at -10 ºC; after the dropwise addition, the system was The reaction was continued for 24 h under stirring at 25 ºC; the product was precipitated with deionized water, washed several times, and then lyophilized in vacuum for 72 h to obtain modified cellulose acetate, which was denoted as M-CA and used in the following examples.
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Embodiment 2
[0049] Embodiment 2: M-CA / PEGMEMA / SiO 2 Preparation of cross-linked composite lithium-ion battery separator
[0050] At room temperature, weigh 1.0 g of M-CA and put it in 5.0 g of DMAc solvent, stir for 2 h; then add 0.5 g of PEGDMA (number-average molecular weight of 750) and stir for 2 h; then add 0.265 g of SiO 2 @VTMO, ultrasonic for 1 h and continue to stir for 6 h to disperse the inorganic nanoparticles uniformly in the solution, finally add 0.042 g of initiator AIBN and stir evenly; ultrasonic for 15 min to remove air bubbles to obtain a casting solution, and then use a film applicator to The casting solution was evenly scraped and coated on a smooth PE plate; finally, it was placed in an oven at 70 ºC for 12 h, and finally M-CA / PEGMEMA / SiO 2 Cross-linked composite lithium-ion battery separator, denoted as C-CAS.
[0051] Add different content of SiO 2 M-CA / PEGMEMA / SiO 2 Preparation of cross-linked composite lithium-ion battery separator
[0052] At room temperatu...
Embodiment 3
[0069] Coat the mixed slurry of lithium iron phosphate, acetylene black and PVDF on the aluminum foil, cut it after drying to obtain the positive electrode, then cover the positive electrode with the C-CAS separator (thickness 80 microns) in Example 2, and dropwise add commercial The electrolyte solution LB-302 is then covered with a lithium sheet, and pressed together to prepare a lithium-ion battery based on a cross-linked composite lithium-ion battery separator, which is a half-cell. The specific pressing and dropping of the electrolyte are conventional techniques.
[0070] The C-CAS separator in Example 2 was replaced with a C-CA or commercial PE separator, and the rest were the same to prepare a C-CA half-cell or a commercial PE half-cell.
[0071] Figure 10 It is the 100-cycle cycle charge and discharge curves of the half-cells assembled by C-CAS, C-CA and commercial PE separators in Example 2 and Comparative Example 1. It can be seen from the figure that at a constan...
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