Diaphragm with high safety performance, battery cell and method for improving safety performance of battery
A technology of safety performance and diaphragm, applied in the field of high safety performance diaphragm, can solve the problems of high production cost, separation of battery separator and pole piece, complicated process, etc., and achieve the effect of good adhesion, difficult separation and improved safety performance.
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[0029] like figure 1 As shown, it is the first embodiment of the present invention, a separator with high safety performance, comprising: a base film 10, an inorganic particle layer 20 and a functional coating 30, and the inorganic particle layer 20 is arranged on the base film 10 and the functional coating 30. Between the layers 30, the inorganic particle layer 20 is made of ceramic particles to increase the heat resistance of the separator; the functional coating layer 30 is laminated and fixed on the inorganic particle layer 20, and the functional coating layer 30 includes adhesive particles, which are adhered to. The nodular particles have a core-shell structure. Disposing the functional coating 30 on the inorganic particle layer 20 can make the separator have higher heat resistance and higher liquid retention capacity.
[0030] like image 3 As shown, the adhesive particles are uniformly distributed in the functional coating 30, the core material 312 of the adhesive par...
Embodiment 1
[0038] Step 1: Preparation of cohesive particles.
[0039]Preparation of core-shell structure: the core material is No. 58 paraffin, the shell material is polymethyl methacrylate, and the shell material accounts for 30% of the mass.
[0040] 1.8 g of emulsifier PVP and 250 mL of deionized water were added to a 500 mL three-necked flask, and stirred at a low speed at 60°C. 40 g of paraffin wax (paraffin wax No. 58), 17.8 g of monomer methyl methacrylate, 2.2 g of cross-linking agent pentaerythritol tetraacrylate and 0.5 g of initiator AIBN were added to a beaker and mixed with stirring at 60°C. After stirring and mixing, the oil phase was poured into the water phase and mechanically stirred at 1500 rpm for 10 min. After the temperature was raised to 80 °C, the reaction was carried out under mechanical stirring at 700 rpm for 5 h. The samples obtained after the reaction were filtered with suction while hot, and washed three times with water and ethanol at 70° C. respectively t...
Embodiment 2
[0048] Step 1: Preparation of cohesive particles.
[0049] 1.8 g of emulsifier PVP and 250 mL of deionized water were added to a 500 mL three-necked flask, and stirred at a low speed at 60°C. 30 g of paraffin wax (paraffin wax No. 58), 26.7 g of monomer methyl methacrylate, 3.3 g of cross-linking agent pentaerythritol tetraacrylate and 0.8 g of initiator AIBN were added to a beaker and mixed with stirring at 60°C. The oil phase was poured into the water phase, and the homogenizer was sheared at a high speed of 17000 rpm for 10 min at 60 °C. The temperature was raised to 80°C, and the reaction was carried out under mechanical stirring at 700rpm for 5h. The samples obtained after the reaction were filtered with suction while hot, and washed three times with water and ethanol at 70° C. respectively to wash off the traces of paraffin, residual dispersant and unreacted monomers attached to the surface of the microcapsules.
[0050] A cohesive particle sample M2 was prepared.
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