Laminated separator for nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery member, and nonaqueous electrolyte secondary battery
a technology of nonaqueous electrolyte and secondary battery, which is applied in the direction of climate sustainability, final product manufacturing, synthetic resin layered products, etc., to achieve the effect of improving the rate characteristic of nonaqueous electrolyte secondary batteries
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example 1
[0129]A PVDF-based resin (manufactured by Arkema. Inc.; product name “KYNAR2801”) was stirred and dissolved in N-methyl-2-pyrrolidone at 65° C. for 30 minutes so that a solid content was 7% by mass. A resultant solution was applied as a coating solution to a polyethylene porous film (thickness 12 μm, porosity 44%, average pore diameter 0.035 μm) through a doctor blade method so that a volume per unit area of the PVDF-based resin in the coating solution, was 0.56 cm3 / m2. A laminated body (1-i), which was a material thus obtained by applying the coating solution to the polyethylene porous film, was immersed in 2-propanol while a coating layer remained wet with NMP, and then was allowed to stand at 25° C. for 5 minutes, so that a laminated porous film (1- ii) was obtained. While the laminated porous film (1-ii) thus obtained was in an immersion solvent wet state, the laminated porous film (1-ii) was further immersed in another 2-propanol, and then was allowed to stand at 25° C. tor 5 m...
example 2
[0130]The laminated porous film (1-iv) obtained in Example 1 was immersed in diethyl carbonate, and then was allowed to stand at 70° C. for 5 minutes. The laminated porous film (1-iv) was taken out from diethyl carbonate and then was dried at room temperature, so that a laminated separator in accordance with Example 2 for a nonaqueous electrolyte secondary battery was obtained. Table 1 shows a rate characteristic of the laminated separator in accordance with Example 2.
example 3
(Example 3
[0131]The laminated porous film (1-iv) obtained in Example 1 was immersed in diethyl carbonate, and then was allowed to stand at 70° C. for 15 minutes. The laminated porous film (1-iv) was taken out from diethyl carbonate and then was dried at room temperature, so that a laminated separator in accordance with Example 3 for a nonaqueous electrolyte secondary battery was obtained- Table 1 shows a rate characteristic, of the laminated separator in accordance with Example 3.
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