Lithium ion battery positive current collector high in safety performance, preparing method thereof and lithium ion battery
A technology for positive current collectors and lithium-ion batteries, applied in the direction of electrode carriers/collectors, battery electrodes, secondary batteries, etc., can solve the problems of small short-circuit resistance, fire and explosion, thermal runaway, etc., to reduce current value and increase resistance , Improve the effect of cycle life
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[0038] Example 1
[0039] Using aluminum foil with a thickness of 25 μm as the base material, the aluminum foil was ultrasonically oscillated in ethanol for 15 minutes to remove the oil stains on the aluminum foil, and then placed in a 0.5 mol / L sodium hydroxide solution for 2 minutes to remove the naturally formed surface of the aluminum foil The oxide layer is then rinsed with distilled water for 15 seconds to obtain a pretreated aluminum foil. The pretreated aluminum foil is used as the anode and the graphite plate is used as the cathode. The voltage is 30 V and the current density is 20 mA / cm in a 0.5 mol / L sulfuric acid aqueous solution. 2 Oxidized for 25 minutes, then rinsed with distilled water for 15 seconds, and dried with hot air at 55 ℃ to obtain aluminum foil coated with a porous alumina resistance layer. The thickness of the porous alumina resistance layer is 75 nm and the blind surface is uniformly distributed. Pore structure (such as figure 1 As shown), the pore...
Example Embodiment
[0045] Example 2
[0046] Using aluminum foil with a thickness of 35μm as the substrate, the aluminum foil is ultrasonically oscillated in acetone for 10 minutes to remove the oil stains on the aluminum foil substrate, and then placed in a 0.25 mol / L potassium hydroxide solution for 1 minute to remove the surface of the aluminum foil. The oxide layer is then rinsed with distilled water for 10 seconds to obtain a pretreated aluminum foil. The pretreated aluminum foil is used as the anode and the graphite plate is used as the cathode. In a mixed aqueous solution of 0.1 mol / L sulfuric acid, 0.05 mol / L phosphoric acid and 0.02 mol / L 2-hydroxypropionic acid, the voltage is 20 V and the current density is 15 mA / cm 2 , Oxidize for 20 minutes, then rinse with distilled water for 15 seconds, blow and dry with hot air at 55 ℃, so as to obtain an aluminum foil positive collector with a porous resistance layer.
[0047] The thickness of the porous alumina resistance layer is 43 nm, and the b...
Example Embodiment
[0050] Example 3
[0051] Using aluminum foil with a thickness of 20 μm as the substrate, the aluminum foil was ultrasonically oscillated in acetone for 10 minutes to remove the oil stains on the aluminum foil substrate, and then mixed with 0.1 mol / L sodium hydroxide and 0.05 mol / L sodium bicarbonate solution Let it stand for 1 minute to remove the oxide layer formed on the surface of the aluminum foil, and then rinse with distilled water for 10 seconds to obtain the pretreated aluminum foil. The pre-treated aluminum foil is used as the anode and the graphite plate is used as the cathode. In a mixed aqueous solution of 0.1 mol / L oxalic acid and 0.02 mol / L 2-hydroxypropionic acid, the voltage is 12 V and the current density is 15 mA / cm 2 , Oxidize for 20 minutes, then rinse with distilled water for 15 seconds, blow and dry with hot air at 55 ℃, so as to obtain an aluminum foil positive collector with a porous resistance layer.
[0052] The thickness of the porous alumina resistance...
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