Wet nonwoven fabric ceramic diaphragm of lithium ion power battery and preparation method thereof
A technology for ceramic diaphragms and power batteries, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of powder drop and low uniformity, damage, safety concerns, etc., achieve fast ion migration speed and reduce baking Time, the effect of improving productivity
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[0032] The preparation method of the ceramic diaphragm comprises the following steps: first preparing a ceramic solution, and then coating the ceramic solution on the surface of a base body to obtain a wet-process non-woven ceramic diaphragm for a lithium-ion power battery.
[0033] Preferably, the method of coating the ceramic solution on the surface of the substrate is at least one of dimple coating, extrusion coating, dip coating and spray coating.
Example Embodiment
[0035] Example 1:
[0036] Select area density 6~10g / m 2 The wet-laid non-woven fabric is used as the substrate; the mass percentage of each raw material in the prepared ceramic solution is as follows: ceramic powder (SiO 2 ): 20%; carboxymethyl cellulose: 2%; styrene-butadiene rubber 8%; deionized water: 70%.
[0037] The ceramic solution is coated on the surface of a wet-laid non-woven fabric substrate by means of extrusion coating, and dried to obtain a ceramic separator.
[0038] The SEM image of the ceramic diaphragm prepared in this embodiment is as follows figure 1 , where (a) is the SEM image of the front of the ceramic diaphragm, and (b) is the SEM image of the cross-section of the ceramic diaphragm.
[0039] The shrinkage test comparison chart of polypropylene diaphragm, polyethylene ceramic diaphragm, polypropylene ceramic diaphragm and the ceramic diaphragm prepared in this embodiment is as follows figure 2 As shown, where (a) is the polypropylene diaphragm ...
Example Embodiment
[0043] Example 2:
[0044] Select surface density 10~15g / m 2 The wet-laid non-woven fabric is used as the substrate; the mass percentage of each raw material in the prepared ceramic solution is as follows: ceramic powder (Al(OH) 3 ): 22%; carboxymethyl cellulose: 1%; styrene-butadiene rubber: 10%; deionized water: 67%.
[0045] The ceramic solution is coated on the surface of a wet-laid non-woven fabric substrate in a dimple coating manner, and dried to obtain a ceramic separator.
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