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Capacitor battery and preparation method thereof

A technology of capacitor battery and conductive agent, which is applied in the direction of hybrid capacitor electrodes, hybrid capacitor electrolytes, capacitors, etc., and can solve problems such as reduced competitiveness

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, companies including Japan's FDK, JM Energy, TAIYO YUDEN, Toshiba and other companies have developed and applied related products, but the current marketization and reported results show that the specific energy of lithium-ion capacitors is less than 40Wh / kg
At present, the specific power of high-power lithium-ion batteries can also reach 3000-5000Wh / kg, so the advantage of lithium-ion capacitors is mainly cycle life, and their competitiveness is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Positive electrode: Dissolve PVDF in N-methylpyrrolidone (NMP), the mass concentration of PVDF is 5%, and the specific surface area is 2000m 2Activated carbon active material and elemental sulfur active material (ratio is 40:20) of / g, carbon nanotube conductive agent is according to active material: conductive electrode: the ratio mixing of binding agent=70:20:10, add NMP to make slurry The solid content is 30%, stirring and mixing in a high-speed mixer, and the mixing time is 8 hours. The positive electrode slurry was coated on a 20 micron thick aluminum foil current collector, the electrode was dried at 85°C, and the positive electrode was collected for future use.

[0036] Negative electrode: Dissolve PVDF in N-methylpyrrolidone (NMP), PVDF mass concentration is 5%, hard carbon active material, carbon black conductive agent according to the ratio of active material: conductive electrode: binder = 94:2.5:3.5 Mix, add NMP to make the viscosity suitable, stir and mix ...

Embodiment 2

[0042] Positive electrode: Dissolve PVDF in N-methylpyrrolidone (NMP), the mass concentration of PVDF is 10%, and the specific surface area is 2500m 2 / g of foam carbon (foam carbon: Co 3 o 4 =90:10) and Li 2 S active material (ratio is 30:30), carbon fiber conductive agent is mixed according to the ratio of active material: conductive electrode: binding agent=60:32:8, add NMP to make the solid content of slurry at 15%, in high-speed mixer Stir to mix, and the mixing time is 20 hours. The positive electrode slurry was coated on a porous aluminum foil current collector with a thickness of 15 microns, the electrode was dried at 65° C., and the positive electrode was collected for future use.

[0043] Negative electrode: Dissolve CMC in deionized water, CMC mass concentration is 3%, SBR binder (Japan Daicel, concentration 50%), MCMB active material, carbon nanotube conductive agent according to active material: conductive electrode: CMC: SBR=90:5:1.5:2.5, add deionized water ...

Embodiment 3

[0049] Positive electrode: Dissolve PVDF in acetone, the mass concentration of PVDF is 15%, and the specific surface area is 2000m 2 / g load RuO 2 Graphene (Graphene: RuO 2 =80:20) and Li 2 S active material (ratio is 55:5), graphene conductive agent is mixed according to the ratio of active material: conductive electrode: binding agent=60:30:10, adds acetone to make the solid content of slurry at 40%, at high speed Blend in a blender for 2 hours. The positive electrode slurry was coated on a porous aluminum foil current collector with a thickness of 15 microns, the electrode was dried at 90°C, and the positive electrode was collected for future use.

[0050] Negative electrode: Dissolve PVDF in acetone, the mass concentration of PVDF is 5%, the silicon-carbon composite and metal lithium powder active material, TiC conductive agent are mixed according to the ratio of active material: conductive electrode: binder = 80:10:10, Add acetone to make the solid content of the slur...

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Abstract

The present invention relates to a capacitor battery comprising a positive electrode, a negative electrode, and a diaphragm disposed between the positive and negative electrodes and an electrolyte. The positive electrode includes a positive electrode current collector and a positive electrode material applied on the current collector, and the positive electrode material includes a positive electrode active material, a binder and a conductive agent, wherein the positive electrode active material includes a mixture of carbon and sulfur or sulfide with redox activity. The negative electrode comprises a negative electrode current collector and a negative electrode material applied on the negative electrode current collector, wherein the negative electrode material comprises a negative electrode active material, a conductive agent and a binder, the negative electrode active material is one or more material in the group consisting of a compound of hard carbon, graphite and silicon carbon anda mixture of the compound and lithium, and the electrolyte contains a sulfur-containing additive. According to the above capacitor battery, active components with redox reaction are added in the positive electrode and the electrolyte, the capacitor battery has the advantages of high specific energy, high working voltage, high power output, high safety and low cost, and the invention further provides a preparation method of the capacitor battery.

Description

Technical field: [0001] The invention relates to an electrochemical energy storage device, in particular to a capacitor battery and a preparation method thereof Background technique: [0002] Electrochemical energy storage devices are showing more and more important influences in the national economy. Electrochemical capacitors and lithium-ion batteries are two of the most representative secondary electrochemical energy storage devices. Electrochemical capacitors are comparable to electric double layer capacitors. Compared with higher specific energy, it is gradually replacing electric double layer capacitors. Electrochemical capacitors have the advantages of high power input / output performance, long cycle life and excellent low temperature performance, and are widely used in smart meters, electric tools, Electric toys, as well as wind power generation, smart grid, rail transit, heavy machinery and other fields. Lithium-ion battery is a kind of energy storage device with hi...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/50H01G11/64H01G11/84H01G11/06
Inventor 王崇陈剑
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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