Negative electrode mix for non-aqueous electrolyte secondary batteries, negative electrode for non-aqueous electrolyte secondary batteries, and non-aqueous electrolyte secondary battery
A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte storage battery electrodes, non-aqueous electrolyte storage batteries, battery electrodes, etc., can solve the problems of insufficient peel strength of copper foil, and achieve the effect of excellent peel strength
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[0135] Next, the present invention will be described in more detail by giving examples, but the present invention is not limited by these examples.
[0136] The inherent viscosities of the polymers obtained in Production Examples 1 to 6 below were measured by the following method.
[0137] 20 ml of N,N-dimethylformamide (DMF) was added to 80 mg of the polymer obtained in each production example, and heated and dissolved at 70° C. for 2 hours to prepare a measurement sample. The inherent viscosity of the measurement sample was measured at 30° C. using an Ubbelohde viscometer manufactured by Kusano Scientific Co., Ltd.
[0138] In addition, regarding the randomness ratio of the polymers obtained in the following Production Examples 4 to 6, the amount of monomer chains containing acidic functional groups and the presence of structural units derived from monomers containing acidic functional groups were determined by the following methods: Quantity, calculate the random rate.
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manufacture example 1
[0146] (Manufacture of Polymer A)
[0147] Put 1020g of ion-exchanged water, 0.6g of methylcellulose, 2.2g of ethyl acetate, 8.0g of 50wt% diisopropyl peroxydicarbonate-Freon 225cb solution, and 396g of vinylidene fluoride into an autoclave with an inner volume of 2 liters. With 4.0 g of monomethyl maleate, the reaction was started at a temperature of 28° C. and a pressure of 4.3 MPa-G, and suspension polymerization was carried out until the pressure was reduced to 1.5 MPa-G (30 hours after the start of the reaction).
[0148] After the polymerization was completed, the polymer slurry was heat-treated at 95° C. for 30 minutes, then dehydrated, washed with water, and dried at 80° C. for 20 hours to obtain a polymer A powder. The rate of polymerization is 88%, and the inherent viscosity of the obtained polymer A is 1.1dl / g, A R (=A 1650-1800 / A 3000-3100 ) is 0.446.
manufacture example 2
[0150] (Manufacture of Polymer B)
[0151] 1010 g of ion-exchanged water, 0.2 g of methylcellulose, 1.7 g of ethyl acetate, 4.0 g of 50 wt % diisopropyl peroxydicarbonate-Freon 225cb solution and 400 g of vinylidene fluoride were put into an autoclave with an inner volume of 2 liters , the reaction was started at a temperature of 26° C. and a pressure of 4.1 MPa-G, and suspension polymerization was carried out until the pressure was reduced to 1.5 MPa-G (15 hours after the start of the reaction).
[0152] After the polymerization was completed, the polymer slurry was heat-treated at 95° C. for 30 minutes, then dehydrated, washed with water, and dried at 80° C. for 20 hours to obtain polymer B powder. The polymerization rate was 92%, and the inherent viscosity of the obtained polymer B was 2.2 dl / g.
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