Cathode plate for lithium-ion capacitor and production method of cathode plate

A technology for negative electrode sheets and capacitors, which is applied in the field of preparation of negative electrode sheets for lithium ion capacitors, can solve the problems of complex process, long process time, uneven lithium intercalation, etc.

Inactive Publication Date: 2015-03-11
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art, such as complex pre-intercalation lithium process, harsh assembly equipment and assembly environment, long process time-consuming, low production efficiency, easy to cause uneven lithium intercalation, etc., to provide and prepare a A method for pre-intercalating lithium ion capacitors with uniform lithium intercalation, precise control of the amount of lithium intercalation, continuous production, and low production cost, wherein the binder I is selected from sodium carboxymethyl cellulose, styrene-butadiene rubber, polystyrene Tetrafluoroethylene, 2-ethylhexyl polyacrylate, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, ammonium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose Polymer, methyl methacrylate-styrene-butadiene rubber, acrylonitrile-butadiene rubber, polyacrylate, polyacrylonitrile, polyimide, polyN-vinylacetamide, vinylidene fluoride, Polyvinylidene chloride, ethylene acrylic acid, ethylene vinyl acetate or polytetrafluoroethylene; binder II selected from polytetrafluoroethylene, polyvinylidene fluoride, ethylene acrylic acid, ethylene vinyl acetate or styrene-butadiene rubber; conductive agent Selected from metal powder, acetylene black, Ketjen black, furnace black, Super-P Li conductive carbon black, conductive graphite, carbon nanotubes, carbon fiber or graphene; carbonaceous active material is selected from natural graphite, artificial graphite, mesophase carbon Microspheres, hard carbon, graphene or polyaniline

Method used

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  • Cathode plate for lithium-ion capacitor and production method of cathode plate
  • Cathode plate for lithium-ion capacitor and production method of cathode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Coating for the first time: (1) first inject 150wt% deionized water into the stirring disperser, then add 2wt% sodium carboxymethylcellulose in the mixing tank, and stir for 360min at a speed of 20r / min; (2 ) Add 4wt% Super-P Li to the stirring tank, stir for 60min at a speed of 20r / min; (3) add 90wt% artificial graphite to the stirring tank, stir at a low speed of 20r / min for 10min, and wait until fully wetted , evacuate to -0.098Mpa, stir in vacuum at a speed of 20r / min, open the high-speed dispersing shaft at the same time, disperse with a speed of 4000r / min, and the time of vacuum stirring and dispersing is 240min; (4) Add 4wt% of Styrene-butadiene rubber (bonding agent I), vacuumize to -0.098Mpa, and stir in vacuum at a speed of 20r / min for 60min; (5) pass the above-mentioned slurry through a 150-mesh sieve; (6) utilize a transfer coater to coat On the front and back sides of 9μm thick copper foil, the thickness of one side coating is 30μm (after drying), the coati...

Embodiment 2

[0066] Coating for the first time: (1) first add the artificial graphite of 93wt% and the graphene of 2wt% in stirring disperser, stir at low speed 60min with the rotating speed of 20r / min; (2) add 75wt% in advance The prepared sodium carboxymethyl cellulose solution with a concentration of 2wt% ensures that the quality of the added sodium carboxymethyl cellulose is 1.5wt%. At the same time, turn on the high-speed dispersing shaft to disperse at a speed of 4000r / min, and the vacuum stirring and dispersing time is 240min; (3) Add 2.5wt% styrene-butadiene rubber to the mixing tank, and at the same time add 126.wt5% deionized water, vacuumed to -0.098Mpa, and vacuum stirred at a speed of 20r / min for 60min; (4) passing the above slurry through a 150-mesh sieve; (5) using a transfer coater to coat 9μm thick copper On the front and back sides of the foil, the coating thickness on one side is 50 μm (after drying), the coating speed is 3 m / min, and it is dried in a blast drying oven a...

Embodiment 3

[0070]Coating for the first time: (1) inject 146wt% deionized water into the stirring disperser at first, then add the polyacrylic acid-2 ethylhexyl aqueous binding agent of 5wt% in the mixing tank (the mass fraction of this emulsion 15wt%), stirred at a speed of 30r / min for 240min; (2) added 4wt% Super-P Li to the stirring tank, and stirred at a speed of 30r / min for 60min; (3) added 91wt% of Super-P Li to the stirring tank Artificial graphite, stirred at a low speed of 20r / min for 10min, after being fully wetted, vacuumed to -0.098Mpa, stirred in vacuum at a speed of 40r / min, at the same time turned on the high-speed dispersion shaft, dispersed at a speed of 4000r / min, vacuum stirred and The dispersion time is 120min; (4) pass the above slurry through a 200-mesh sieve; (5) use a transfer coating machine to coat the front and back sides of a 9 μm thick copper foil, and the coating thickness on one side is 100 μm (drying After), the coating speed is 2m / min, and it is dried at 1...

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Abstract

The invention relates to a cathode plate for a lithium-ion capacitor. The cathode plate comprises a current collector, a bottom coating and an upper coating. The bottom coating coats two sides of the current collector, and the upper coating coats the bottom coating. The bottom coating comprises a carbonaceous active material, a conductive agent and a binding agent I. The upper coating comprises stabilized lithium metal powder and a binding agent II. The invention further relates to a method for producing the cathode plate. The method is simple in production process, easy to operate on a large scale and capable of achieving pre-embedding without harsh environments; meanwhile, energy matching between the cathode plate and an activated-carbon anode plate of the lithium-ion capacitor is achieved easily by adjusting the coating thickness.

Description

technical field [0001] The invention relates to the field of electrochemical capacitors, in particular to a method for preparing a negative electrode sheet for lithium ion capacitors. Background technique [0002] With the rapid development of modern society and the continuous emergence of a large number of portable electronic products and electric vehicles, higher requirements are put forward for secondary energy storage devices with higher energy density and power density, long cycle life, low manufacturing cost, and environmental friendliness . Due to the advantages of high power density and long cycle life, supercapacitors have received widespread attention in recent years, and are predicted to have broad application prospects in mobile energy storage and other fields. However, supercapacitors are also used in many applications due to their low operating voltage and low energy density. field is restricted. Different from supercapacitors, the anode of lithium-ion capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/70H01G11/86H01G11/06
CPCY02E60/13H01G11/38H01G11/06H01G11/50H01G11/68H01G11/86
Inventor 郭德超
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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