A non symmetric water natrium/kalium ion battery capacitor

A potassium ion, asymmetric technology, applied in the direction of electrolytic capacitors, capacitors, battery electrodes, etc., can solve the problem of low energy storage density of capacitors, and achieve the effects of high power, safe use, high specific capacity and specific energy

Inactive Publication Date: 2008-08-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with traditional capacitors and secondary batteries, the specific power of supercapacitors is more than 10 times that of batteries, the ability to store charges is higher than that of ordinary capacitors, a

Method used

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  • A non symmetric water natrium/kalium ion battery capacitor
  • A non symmetric water natrium/kalium ion battery capacitor
  • A non symmetric water natrium/kalium ion battery capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The positive electrode material is NaMnO synthesized by solid phase method 2 . Positive plate composition according to NaMnO 2 : carbon black: binder = 8: 1: 1 weight ratio mixed evenly, coated on the nickel mesh current collector, dried and pressed into electrodes. The negative electrode material is commercial activated carbon, and the negative electrode slurry is mixed according to the ratio of activated carbon: conductive agent: binder = 8:1:1, and then evenly coated on the nickel mesh current collector, dried and pressed into an electrode. Use non-woven fabrics for commercial alkaline manganese batteries as separators, use 0.5MNa 2 SO 4 The aqueous solution is used as an electrolyte and assembled into a battery. The discharge current between 0~2V is 30C, and the charge and discharge curve is as attached figure 1 As shown, the capacity of the battery is 240mAh, and the capacity retention rate after 10,000 cycles can be 89% (see attached figure 2 ).

Embodiment 2

[0020] The cathode material is made of synthetic NaCoO 2 . Positive sheet composition according to NaCoO 2 : carbon black: binder = 8: 1: 1 weight ratio mixed evenly, coated on the nickel mesh current collector, dried and pressed into electrodes. The negative electrode material is commercial activated carbon, and the negative electrode slurry is mixed according to the ratio of activated carbon: conductive agent: binder = 8:1:1, and then evenly coated on the nickel mesh current collector, dried and pressed into an electrode. Using non-woven fabric as the diaphragm, with 0.5M Na 2 SO 4 The solution acts as an electrolyte and is assembled into a battery. The discharge current between 0~2V is 30C, the discharge capacity of the battery is 220mAh, the charge and discharge curve is as attached image 3 As shown, the capacity retention rate of 10,000 cycles can be 91%.

Embodiment 3

[0022] The cathode material is made of synthetic NaV 3 o 8 . Positive sheet composition according to NaV 3 o 8 : carbon black: binder = 8: 1: 1 weight ratio mixed evenly, coated on the nickel mesh current collector, dried and pressed into electrodes. The negative electrode material is commercial activated carbon, and the negative electrode slurry is mixed according to the ratio of activated carbon: conductive agent: binder = 8:1:1, and then evenly coated on the nickel mesh current collector, dried and pressed into an electrode. Using non-woven fabric as the diaphragm, with 0.5M Na 2 SO 4 The aqueous solution is used as an electrolyte and assembled into a battery. The discharge current between 0~2V is 30C, the capacity of the battery is 200mAh, and the capacity retention rate can be 83% after 10,000 cycles.

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Abstract

The present invention belongs to the technique field of the battery and the capacitor, and in particular to an asymmetrical water-system sodium/potassium ion battery capacitor. The invention combines an insertion-extraction mechanism of sodium ion or potassium ion in the electrode material and the double electrode layer capacitor mechanism generated by ionic adsorption into an energy storing device. In the energy storing device, the positive electrode adopts the electrode material in which the sodium ion or potassium ion can be inserted and extracted. The negative electrode adopts the porous carbon material of high specific surface area activated carbon, carbon nano-tube, carbon fiber, mesoporous carbon or carbon aerogel and the like. The electrolyte adopts the water solution containing sodium or potassium ion compound. The battery and capacitor of the invention have the advantages of wide material source, easy preparing, low cost, good security, no environmental pollution, long cycle lifetime, higher energy density and power density. The battery and capacitor can be used as the energy source of various electric appliance, and are especially suitable as the electrokinetic cell of the electric car.

Description

technical field [0001] The invention belongs to the technical field of batteries and capacitors, and in particular relates to a novel high-performance asymmetric water-based sodium / potassium ion battery capacitor. Background technique [0002] The continuous development of human beings requires more and more energy, whether in the family or in industry, the demand for energy is increasing. At the same time, human beings are also facing new problems: environmental pollution and global warming. In addition, the available natural resources are limited, therefore, it is necessary to improve the efficiency of resource and energy use. [0003] The development of new and renewable energy sources such as nuclear energy, wind energy, solar energy, hydroelectric energy, etc. is the focus of various countries today, but the latter three are often affected by climate and weather. Compared with traditional energy sources, these new energy sources have indisputable advantages. However,...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/155H01G9/042H01G9/058H01G9/022H01G9/035H01M10/00H01M4/36H01M14/00H01G11/06H01G11/30
CPCH01G11/04H01G11/58Y02E60/13Y02T10/70
Inventor 曲群婷王高军施轶吴宇平
Owner FUDAN UNIV
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