Separation film for secondary battery and the secondary battery
A secondary battery and separator technology, applied in the field of secondary batteries, to achieve the effects of high durability, resistance not easy to increase, and excellent heat resistance
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Embodiment 1
[0253]
[0254] Add F(CF 2 ) 5 COONH 4 is 3300ppm, and CH 2 = CFCF 2 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4The polymerization tank was sealed as an aqueous solution with a concentration of 200 ppm. Vacuumize the vacuum in the tank after replacing it with nitrogen, and put 400 cc equivalent amount of isopropanol as a chain transfer agent into the tank while vacuuming. Thereafter, a mixed gas monomer having a composition ratio of vinylidene fluoride (VdF) / tetrafluoroethylene (TFE) of 67 / 33 mol % was charged into the tank up to 0.8 MPaG while stirring at 70°C. Thereafter, an aqueous solution in which ammonium persulfate was dissolved in an amount corresponding to 100 ppm was injected with nitrogen gas to initiate a reaction. In order to maintain the pressure in the tank, a mixed monomer having a composition ratio of VdF / TFE of 67 / 33 mol % was additionally charged. When the added monomer reached 346 g, the stirring was adjusted to a low speed, and the gas in the tank was ...
Embodiment 2
[0271] Instead of using the aqueous fluoropolymer dispersion A used in Example 1, the following aqueous fluoropolymer dispersion B was used, except that the same operation as in Example 1 was performed to produce a composite porous membrane slurry, Separators and secondary batteries.
[0272]
[0273] Add F(CF 2 ) 5 COONH 4 is 3300ppm, and CH 2 = CFCF 2 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 The polymerization tank was sealed as an aqueous solution with a concentration of 200 ppm. Vacuumize the vacuum in the tank after replacing it with nitrogen, and put 600 cc equivalent amount of isopropanol as a chain transfer agent into the tank while vacuuming with a syringe. Thereafter, a mixed gas monomer having a VdF / TFE composition ratio of 67 / 33 mol % was charged into the tank while stirring at 450 rpm at 70° C. to 0.8 MPaG. Thereafter, an aqueous solution of ammonium persulfate in an amount corresponding to 100 ppm was injected with nitrogen gas to initiate a reaction. In ...
Embodiment 3
[0281] Instead of using the aqueous fluoropolymer dispersion A used in Example 1, the following aqueous fluoropolymer dispersion C was used, except that the same operation as in Example 1 was performed to produce a composite porous membrane slurry, Separators and secondary batteries.
[0282]
[0283] Add F(CF 2 ) 5 COONH 4 is 3300ppm, and CH 2 = CFCF 2 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 The polymerization tank was sealed as an aqueous solution with a concentration of 200 ppm. After replacing the vacuum in the tank with nitrogen, evacuate, and inject 800 cc equivalent amount of isopropanol as a chain transfer agent while evacuating with a syringe. Thereafter, a mixed gas monomer having a VdF / TFE composition ratio of 67 / 33 mol % was charged into the tank while stirring at 450 rpm at 70° C. to 0.8 MPaG. Thereafter, an aqueous solution in which ammonium persulfate was dissolved in an amount corresponding to 100 ppm was injected with nitrogen gas to initiate a reactio...
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