Negative electrode plate of high-rate and high-power battery capacitor and preparation method of negative electrode plate

A technology for battery capacitors and negative pole pieces, which is applied in the manufacture of battery electrodes, non-aqueous electrolyte battery electrodes, and hybrid/electric double-layer capacitors. and other problems, to achieve the effect of satisfying high current charging and discharging, improving rate performance, and increasing energy density

Active Publication Date: 2017-05-31
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high crystallinity and highly oriented layered structure of graphite, it is sensitive to electrolyte and has poor compatibility with solvents; in addition, graphite has low high-current charge and discharge capacity
At the same time, during the charge-discharge cycle, the distance between graphite layers changes greatly; and lithium and organic solvents are intercalated between graphite layers and organic solvents are decomposed, which may easily cause graphite layers to peel off gradually, and graphite particles to crack and pulverize. Thereby reducing the cycle life of graphite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The large-rate and high-power battery capacitor negative pole piece in this embodiment includes the current collector and the electrode material coated on all areas on one side of the current collector: wherein the current collector is corroded aluminum foil, and the corroded aluminum foil is the entire surface side of the The area is obtained after corrosion; the electrode material is obtained by uniformly pressing the active material, conductive agent, and binder. The active material is graphite, carbon nanotube, activated carbon, coke, mesocarbon microspheres, hard carbon, and soft carbon. One or more of the composite materials. Use a separator to separate the positive pole piece of the battery capacitor from the negative pole piece sample of this program to make a battery cell, dry it in a vacuum at 80°C for 24 hours, inject electrolyte into a glove box, and encapsulate it in aluminum plastic film, and let it stand for 12 hours. Formation and secondary packaging to o...

Embodiment 2

[0037] The negative pole piece of the large-rate and high-power battery capacitor in this embodiment includes a current collector and electrode materials coated on all areas on both sides of the current collector: the current collector is corroded aluminum foil, and the corroded aluminum foil is on both sides of its surface All areas are obtained after corrosion; the electrode material is obtained by uniformly pressing the active material, conductive agent, and binder. The active material is graphite, carbon nanotube, activated carbon, coke, mesocarbon microspheres, hard carbon, soft A composite material of one or a mixture of several types of carbon. Use a separator to separate the positive pole piece of the battery capacitor from the negative pole piece sample of this program to make a battery cell, dry it in a vacuum at 80°C for 24 hours, inject electrolyte into a glove box, and encapsulate it in aluminum plastic film, and let it stand for 12 hours. Formation and secondary p...

Embodiment 3

[0039] The negative pole piece of the large-rate and high-power battery capacitor in this embodiment includes a current collector and an electrode material coated on the middle and lower regions on both sides of the current collector (such as the lower two-thirds of the two sides): where the current collector is Corroded aluminum foil, the corroded aluminum foil is obtained after etching all of its surface on one side and the middle and lower areas on the other side (such as the lower two-thirds of the side); the electrode material is composed of active materials, conductive agents, adhesives The binding agent is mixed and uniformly pressed, and the active material is a composite material of one or a mixture of graphite, carbon nanotubes, activated carbon, coke, mesocarbon microspheres, hard carbon, and soft carbon. Use a separator to separate the positive pole piece of the battery capacitor from the negative pole piece sample of this program to make a battery cell, dry it in a ...

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Abstract

The invention discloses a negative electrode plate of a high-rate and high-power battery capacitor. The negative electrode plate comprises a current collector and an electrode material coating at least one part of area of the current collector, wherein the current collector is a corrosive aluminum foil; the corrosive aluminum foil is obtained through corrosion of at least one part of area of the surface thereof; the electrode material is obtained by mixing an active material, a conductive agent and a binder evenly and pressing a mixture; and the active material is a composite material of one or a mixture of more of graphite, carbon nanotubes, activated carbon, coke, mesocarbon microbeads, hard carbon and soft carbon. The substances of the electrode material of an electrode disclosed by the invention are good in bondability and are not easy to strip, the service life is prolonged, the negative electrode plate has a relatively low potential platform and the average working voltage of a hybrid capacitor battery is higher than that of a traditional double electric layer capacitor, so that the energy density of a system is improved.

Description

Technical field [0001] The invention relates to a battery capacitor electrode pole piece and a preparation method thereof, in particular to a large-rate, long-life, high-power battery capacitor negative pole piece and a preparation method thereof. Background technique [0002] Currently commonly used energy storage devices mainly include lithium-ion batteries and supercapacitors. Lithium-ion batteries have the characteristics of high energy density, but have short cycle life and low power density. Although supercapacitors have high specific power and cycle life, they have low energy density. There is an urgent need to develop a hybrid energy storage device with both high power density and high energy density. [0003] Supercapacitor battery is a new type of energy storage device with both high energy density and high power density. It mainly performs "dual function" energy storage through two methods of electric double layer capacitor and lithium ion insertion / desorption, and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/50H01G11/86H01M4/13H01M4/139
CPCH01G11/26H01G11/50H01G11/86H01M4/13H01M4/139Y02E60/10Y02E60/13
Inventor 阮殿波吴奕环郑超陈雪丹刘秋香
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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