Adhesive sheet for battery and lithium ion battery
An adhesive sheet and battery technology, applied in the field of lithium ion batteries, can solve the problems of increased manufacturing cost and achieve the effect of excellent performance
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[0075] (3) Preparation of Adhesive Composition P
[0076] Adhesive composition P can be prepared by preparing (meth)acrylate polymer (A), adding inorganic microparticles 121 to the obtained (meth)acrylate polymer (A), and adding a crosslinking agent as needed (B), additives, etc.
[0077] The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer using a general radical polymerization method. It is preferable to perform polymerization of a (meth)acrylate polymer (A) by the solution polymerization method using a polymerization initiator as needed. However, the present invention is not limited thereto, and polymerization may be performed without a solvent. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, and the like, and two or more of them may be used in combination.
[0078] As a polymerization initiator, an azo compound, an orga...
Embodiment 1
[0123] 1. Preparation of Coating Liquid of Adhesive Composition
[0124] A (meth)acrylate polymer was prepared by copolymerizing 80 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of dodecyl methacrylate, and 5 parts by mass of acrylic acid by a solution polymerization method. As a result of measuring the molecular weight of this polymer using gel permeation chromatography (GPC) described later, the weight average molecular weight (Mw) was 750,000.
[0125] Then, 100 parts by mass (solid content conversion value; hereinafter the same) of the obtained (meth)acrylate polymer, 3.72 parts by mass of trimethylolpropane-modified toluene diisocyanate (TOYOCHEMCo , Ltd., trade name "BHS8515") were mixed and diluted with ethyl acetate to prepare a diluted solution with a solid content concentration of 30%. This diluent contains the above-mentioned (meth)acrylate polymer and the above-mentioned isocyanate crosslinking agent as an adhesive component.
[0126] With respect to 1...
Embodiment 2～7、 comparative example 1～4
[0141] An adhesive sheet for batteries was produced in the same manner as in Example 1 except that the type and addition amount of the inorganic fine particles were changed to those shown in Table 1. In addition, the description of "-" in Comparative Example 6 means that no fine particles were used.
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