Binder for electricity storage device
A technology for power storage devices and adhesives, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of easy detachment of battery active materials, not necessarily enough, low fluororesin adhesion, etc., and achieve good charge-discharge characteristics. , The effect of inhibiting swelling and good adhesion
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Embodiment 1
[0165] [Example 1] Production of fluorinated copolymer A
[0166] In this example, a redox polymerization initiator was used.
[0167] That is, after degassing the inside of a stainless steel pressure-resistant reactor with an inner volume of 3200 mL equipped with an anchor blade for stirring, 1700 g of ion exchange water and 13.3 g of sodium lauryl sulfate as an emulsifier are added to the reactor. , 60 g of disodium hydrogen phosphate dodecahydrate and 0.9 g of sodium hydroxide as a pH adjuster, and 4.4 g of ammonium persulfate as an initiator (1 hour half-life temperature 82°C). Then, 0.4 g of ethylene diamine tetraacetic acid disodium salt dihydrate (hereinafter referred to as EDTA) and 0.3 g of ferrous sulfate heptahydrate as a redox catalyst were dissolved in 200 g of ion exchange water, and the resulting aqueous solution Add to the reactor. The pH of the aqueous medium in the reactor at this time was 9.2.
[0168] Next, a monomer mixture gas of TFE / P=95 / 5 (molar ratio) was ...
Embodiment 2
[0175] [Example 2] Production of fluorinated copolymer B
[0176] Except that in Example 1, the ratio of the monomer mixture gas initially pressed into the reactor was changed from TFE / P=95 / 5 (molar ratio) to TFE / P=93 / 7 (molar ratio), and the pressure was changed during polymerization. Except that the ratio of the monomer mixed gas entering the reactor was changed from TFE / P=70 / 30 (molar ratio) to TFE / P=63 / 27 (molar ratio), the same operation as in Example 1 was performed to obtain a fluorine-containing copolymer 物B latex. The content of the fluorinated copolymer B in the latex was 29% by mass.
[0177] The copolymer composition of the fluorinated copolymer B is (a) / (b)=63 / 37 (molar ratio).
[0178] In addition, an electrode mixture 2 and an electrode 2 were prepared in the same manner as in Example 1, and the same evaluation was performed.
Embodiment 3
[0179] [Example 3] Production of fluorinated copolymer C
[0180] In this example, a thermal decomposition type polymerization initiation system was used.
[0181] That is, after degassing the inside of a stainless steel pressure-resistant reactor with an inner volume of 3200 mL equipped with a stirring anchor blade, 1700 g of ion exchange water, 13.3 g of sodium lauryl sulfate, and dihydrogen phosphate were added to the reactor. Sodium dodecahydrate 4g, sodium hydroxide 2.0g, ammonium persulfate 4.4g (1 hour half-life temperature 82°C). Next, a monomer mixture gas of TFE / P=93 / 7 (molar ratio) was injected at 75°C under the condition that the internal pressure of the reactor reached 2.50 MPaG. The anchor paddle was rotated at 300 rpm to start the polymerization reaction.
[0182] Maintain the polymerization temperature at 75°C for polymerization. As the polymerization progresses, the pressure in the reactor drops, so when the internal pressure of the reactor drops to 2.49 MPaG, TFE / ...
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