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A kind of preparation method of negative electrode current collector and supercapacitor using the same

A technology for supercapacitors and current collectors, which is applied to the preparation method of negative electrode current collectors and the field of supercapacitors using the current collectors, which can solve the problems of low-carbon negative electrode stability, large gap, corrosion of negative electrode current collectors, etc., and achieve long cycle life, The effect of high energy density and long service life

Active Publication Date: 2016-01-20
SHANGHAI AOWEI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

from PbO 2 / H 2 SO 4 According to relevant reports on the performance of / C asymmetric supercapacitors, at present, the main shortcoming of this type of supercapacitor is that the charge-discharge cycle life is too low, generally 1000-2000 times, and the highest can only reach 5000 times, which is different from other long-term supercapacitors. Compared with supercapacitors with cycle life, there is a big gap, which also limits their promotion and application in the market
[0004] in PbO 2 / H 2 SO 4 In / C asymmetric supercapacitors, the low charge-discharge cycle life is mainly due to the poor stability of the carbon negative electrode, which is mainly due to the poor bonding between the negative electrode current collector and the carbon material with high specific surface area; Corrosion exists during charging and discharging, which seriously affects the stability of supercapacitor work

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Production of the positive plate: mix lead powder and lead monoxide powder at a mass ratio of 45:55, add an appropriate amount of sulfuric acid and water to make a paste, and then coat it on a 1.25mm lead-calcium grid. After drying at ℃-8min, put it in an environment with a temperature of 45℃ and a relative humidity of 80% to cure for 12 hours, then take it out and make it into 120*75*1.25mm 3 positive electrode plate. Assemble the prepared positive electrode raw plate and lead foil with a glass fiber separator in between to form a half-cell, and inject an excess of 1.08g / cm 3 Aqueous sulfuric acid solution, after 4 hours of liquid injection, charge and discharge at 4mA / cm 2 The current (calculated based on the area of ​​the positive electrode) charges the formed half-cell for 24 hours, and then charges it at 8mA / cm 2 The current discharges it to a voltage of 1.75V, and then takes out the formed plate, rinses it with deionized water, and dries it in an oven at 80°C for...

Embodiment 2

[0048] The making of positive electrode sheet: with embodiment 1.

[0049] Production of negative electrode sheet:

[0050] (1) Chemical treatment on the surface of the negative electrode current collector: the overall size is 120*75*1.00mm 3 1. Put the lead-tin alloy foil with a round hole into the acetic acid aqueous solution with a temperature of 35°C and a mass percentage concentration of 25% for 25 minutes, take it out and wash it with deionized water to remove the residual solution, and put it in an oven at 80°C to dry 30 minutes, take out and set aside.

[0051] (2) Coating of the metal oxide layer on the surface of the negative electrode current collector: SnO 2 1. Weigh CMC according to the mass ratio of 90:10, add an appropriate amount of water to make a paste, and then coat it on the above-mentioned lead-tin alloy foil, and then put it in an oven at 100°C to dry for 1 hour. The thickness of the metal oxide layer on the surface is 20 μm.

[0052] (3) Coating of t...

Embodiment 3

[0056] The making of positive electrode sheet: with embodiment 1.

[0057] Production of negative electrode sheet:

[0058] (1) Chemical treatment on the surface of the negative electrode current collector: the overall size is 120*75*1.00mm 3 1. Put the lead-tin alloy foil with a round hole into the hydrochloric acid aqueous solution with a temperature of 35°C and a concentration of 15% by mass for 8 minutes, take it out and wash it with deionized water to remove the residual solution, and put it in an oven at 80°C to dry 30 minutes, take out and set aside.

[0059] (2) Coating of the metal oxide layer on the surface of the negative electrode current collector: SnO 2 1. Weigh CMC according to the mass ratio of 90:10, add an appropriate amount of water to make a paste, and then coat it on the above-mentioned lead-tin alloy foil, and then put it in an oven at 100°C to dry for 1 hour. The thickness of the metal oxide layer on the surface is 20 μm.

[0060] (3) Coating of the ...

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Abstract

The invention proposes a method for preparing a negative electrode current collector, which is characterized in that it includes the following steps: 1) immersing the negative electrode current collector in a high-temperature acidic solution for a period of time; 2) washing off the surface acidic solution and drying; 3) coating the metal The oxide layer is dried; 4) the carbonaceous material layer is coated and dried. The present invention also proposes a supercapacitor using the negative electrode current collector of the above preparation method, which is composed of a positive electrode sheet, a negative electrode sheet, a diaphragm and an acid electrolyte, and is characterized in that the active material of the positive electrode sheet is composed of lead oxide, so The active material of the above-mentioned negative plate adopts porous carbon material. The supercapacitor of the present invention has high energy density (18-25Wh / Kg) and long cycle life (>15000 times), and can be well applied in some occasions requiring high energy and long service life.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a method for preparing a negative current collector and a supercapacitor using the current collector. Background technique [0002] Supercapacitor is a chemical energy storage device that has developed rapidly in the past ten years. Its overall performance is between that of traditional capacitors and batteries. Has been widely used in consumer electronics backup power, hybrid vehicles, wind power, high-power UPS and other fields. However, compared with batteries, supercapacitors have lower energy, which limits their use in some occasions that require high energy density. [0003] At present, in order to increase the energy density of supercapacitors, an asymmetric structure design is generally adopted, that is, one electrode of the supercapacitor uses the electrode of the battery (such as nickel hydroxide, lead dioxide, lithium manganate, lithium titanate, etc.), and th...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/86H01G11/46H01G11/26H01G11/32
CPCY02E60/13
Inventor 许检红杨恩东颜亮亮
Owner SHANGHAI AOWEI TECH DEV