Asymmetric capacitor and preparation method thereof
A capacitor, asymmetric technology, applied in the field of capacitors, can solve the problems of poor matching of positive and negative electrodes, low energy density, low specific capacity of asymmetric capacitors, etc., and achieve the effect of improving the overall performance
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[0053] The present invention also provides a method for preparing the asymmetric capacitor described in the above technical solution, comprising the following steps:
[0054] A) coating the positive electrode slurry on the first current collector, followed by drying and compacting to obtain the positive electrode sheet; the positive electrode slurry includes nickel hydroxide;
[0055] B) rolling the negative electrode slurry onto the second current collector after forming a film to obtain the negative electrode sheet; the negative electrode slurry includes a carbon material;
[0056] C) Assembling the positive pole piece, the negative pole piece, the diaphragm and the electrolyte to obtain an asymmetric capacitor;
[0057] The steps A) and B) are not limited in order.
[0058] In the present invention, the positive electrode slurry is coated on the first current collector, and then dried and compacted in sequence to obtain the positive electrode sheet. In the present inventi...
Embodiment 1
[0083] (1) Preparation of positive pole piece: mix micron-sized spherical nickel hydroxide, polytetrafluoroethylene, acetylene black, and titanium oxide according to the mass ratio of 89:3:5:3, stir evenly, and then add the above total mass 20% carboxymethyl cellulose was stirred evenly to obtain positive electrode slurry; the above positive electrode slurry was evenly coated on the current collector with a scraper, dried at 90°C for 12h, and then compacted at 28MPa to control the mass density to 0.01 g / cm 2 , and finally cut into a circular pole piece with a diameter of 12.5 mm to obtain a positive pole piece.
[0084] (2) Preparation of the negative pole piece: Active carbon, polytetrafluoroethylene, acetylene black, and titanium oxide are dosed according to the mass ratio of 85:7:5:3, and stirred evenly to obtain the negative electrode slurry; DG-W100 type electric double-roller rolls repeatedly to form a film, and then rolls on the current collector to control the mass de...
Embodiment 2
[0088] (1) Preparation of positive pole piece: mix micron-sized spherical nickel hydroxide, polytetrafluoroethylene, graphene, and titanium oxide according to the mass ratio of 89:3:5:3, stir evenly, and then add the above total mass 20% carboxymethyl cellulose was stirred evenly to obtain positive electrode slurry; the above positive electrode slurry was evenly coated on the current collector with a scraper, dried at 90°C for 12h, and then compacted at 28MPa to control the mass density to 0.01 g / cm 2 , and finally cut into a circular pole piece with a diameter of 12.5 mm to obtain a positive pole piece.
[0089] (2) Preparation of the negative pole piece: Active carbon, polytetrafluoroethylene, graphene, and titanium dioxide are dosed according to the mass ratio of 85:7:5:3, and stirred evenly to obtain the negative electrode slurry; DG-W100 type electric double-roll machine rolls repeatedly to form a film, and then rolls on the current collector to control the mass density ...
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