Lithium secondary battery
A lithium secondary battery and battery reaction technology, applied to secondary batteries, lithium batteries, battery electrodes, etc., can solve problems such as uneven precipitation and inactive coatings that cannot be removed
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Embodiment 1
[0075] (production of positive electrode)
[0076] 85% by mass of lithium iron phosphate as the first active material of the positive electrode active material, 4.5% by mass of manganese dioxide as the second active material, 6.1% by mass of acetylene black as the conductive material, and the solid content concentration of the binder An appropriate amount of ions was added to a 40% by mass acrylic copolymer solution of 2.7% by mass (in terms of solid content) and an aqueous solution of carboxymethylcellulose having a solid content concentration of 2% by mass as a thickener 1.8% by mass (in terms of solid content). Stirring and kneading were performed while exchanging water, thereby preparing positive electrode slurry.
[0077] Next, the positive electrode slurry was coated on one side of a current collector made of aluminum foil having a thickness of about 0.02 mm, and dried at 70° C. for 10 minutes. Then, a positive electrode layer was formed on one side of the current colle...
Embodiment 2
[0082] Except using the positive electrode slurry prepared by the following method, the positive electrode was produced by the same method as Example 1, and the evaluation cell similar to Example 1 was assembled using this positive electrode as a working electrode.
[0083] For the positive electrode slurry, 71.6% by mass of lithium iron phosphate as the first active material of the positive electrode active material, 17.9% by mass of manganese dioxide as the second active material, 6.1% by mass of acetylene black as the conductive material, and 6.1% by mass of acetylene black as the binding material. 2.7% by mass (in terms of solid content) of an acrylic copolymer solution with a solid content concentration of 40% by mass of the agent, and 1.8% by mass (in terms of solid content) of a carboxymethyl cellulose aqueous solution with a solid content concentration of 2% by mass as a thickener. It is prepared by adding an appropriate amount of ion-exchanged water and stirring and kn...
Embodiment 3
[0085] 85.5% by mass of lithium cobalt oxide as the first active material of the positive electrode, 4.5% by mass of manganese dioxide as the second active material, 3% by mass of acetylene black and 3% by mass of graphite as the conductive material, and 3% by mass of graphite as the viscous A positive electrode slurry was prepared by adding an appropriate amount of N-methyl-2-pyrrolidone to a polyvinylidene fluoride solution with a solid content concentration of 12 mass% and 4 mass% (solid content conversion) while stirring and kneading.
[0086] Next, the positive electrode slurry was coated on one side of a current collector made of aluminum foil having a thickness of about 0.02 mm, and dried at 100° C. for 10 minutes. Then, a positive electrode layer was formed on one side of the current collector by pressing the dried coating film to a density of 3.3 g / cc to prepare a positive electrode. Furthermore, an evaluation cell similar to that of Example 1 was assembled using this...
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Abstract
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