Composite separator membrane, preparation method thereof, and application thereof in lithium ion batteries
A composite diaphragm and lithium-ion technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of high-speed charging/discharging performance damage, battery performance degradation, and no positive improvement, etc., to achieve excellent Effects of charge/discharge characteristics, improvement of battery safety, and reduction of short-circuit phenomena
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[0064] This application also provides a method for preparing a composite diaphragm, including the following steps:
[0065] Mix the binder, the organic solvent and the garnet-type conductor material to obtain a suspension after dispersion;
[0066] The suspension is coated on the surface of the diaphragm and dried to obtain a composite diaphragm.
[0067] The garnet-type conductor material described in this application is preferably a lithium ion conductor as shown in formula (I):
[0068] Li x A 3 B 2 C δ O 12±λ (Ⅰ);
[0069] 3≤x≤8, 0≤λ≤1, 0≤δ≤1;
[0070] A is selected from Na, K, Mg, Ca, Sr, Ba, Sc, Y, Al, Cr, Fe, Mo, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm , One or more of Yb and Lu; when A is selected from more than one element, the sum of the atoms of each element is 3;
[0071] B is selected from one or more of Zr, Hf, Nb, Ta, W, In, Sb, Bi, Te, Y, Al, Cr, Fe, Mo, La, Sc, Ba, Sr, Ca, Sn and Mg Species; when B is selected from more than one element, the sum of the atoms of...
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[0086] Example 1
[0087] With an average particle size of 0.3 micron Li 3 Y 3 Te 2 O 12 For the ceramic layer, the mass ratio of binder, organic solvent and conductor material is 1:20:10. After the three are mixed and dispersed by planetary ball milling for 2 hours, use the AFA-II automatic coating machine of Shanghai Pushen Chemical Machinery Co., Ltd. The PP-PE-PP three-layer composite membrane (celgard 2300) was coated on one side, dried in an oven at 60°C for 4 hours, and transferred to a vacuum oven at 60°C for further drying for 10 hours to obtain a ceramic composite membrane. The thickness of the diaphragm before coating is 25 microns, and the thickness of the diaphragm after coating and drying is 27 microns. The calculated coating thickness is 2 microns. Li 3 Y 3 Te 2 O 12 -Scanning electron microscope photos of PP-PE-PP composite diaphragm section as image 3 As shown, the comparison of coating thickness, liquid absorption rate and conductivity data is shown in Table 1....
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[0089] Example 2
[0090] With an average particle size of 0.3 micron Li 5 La 3 Ta 2 O 12 For the ceramic layer, the mass ratio of binder, organic solvent and conductor material is 1:20:10. After the three are mixed and dispersed by planetary ball milling for 2 hours, use the AFA-II automatic coating machine of Shanghai Pushen Chemical Machinery Co., Ltd. The PP-PE-PP three-layer composite membrane (celgard 2300) was coated on one side, dried in an oven at 60°C for 4 hours, and transferred to a vacuum oven at 60°C for 10 hours. Get Li 5 La 3 Ta 2 O 12 Ceramic composite diaphragm. The comparison of coating thickness, liquid absorption and conductivity is shown in Table 1, and the comparison of heat shrinkage data is shown in Table 1. Figure 8 , The curve ○ in the figure is the heat shrinkage curve of the organic membrane treated at the undetermined temperature, and the curve ● is the heat shrinkage curve of the composite membrane prepared in this embodiment at the undetermined te...
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