Super capacitor

A supercapacitor and electrolyte technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of low capacity density of supercapacitors, and achieve the effects of excellent cycle performance, strong operability and good reproducibility

Inactive Publication Date: 2011-08-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problem of low capacity density of existing supercapacitors, the present invention provides a supercapacitor with good safety performance, high capacity and excellent cycle performance

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh a certain amount of elemental molybdenum into a round-bottomed flask, add a certain amount of 30% hydrogen peroxide into the flask under ice-water bath conditions, stir and react to obtain a transparent yellow peroxomolybdic acid sol. Add a polystyrene template with a grain size of 200nm-250nm, adsorb for 1 hour, age overnight, put it into a crucible, and place it in a muffle furnace with 1 o C / min rate heating up to 450 o C, kept for half an hour, cooled to room temperature, and obtained nanosheet MoO 3 (SEM spectra are shown in the attached figure 1 a), The nanosheet size is 1 mm ′1 mm ′ 100 nm.

[0023] Molybdenum trioxide nanosheets were used as the active material of the negative electrode, mixed evenly with 10 wt.% (based on the negative electrode active material) of acetylene black (conductive agent) and 10 wt.% of polytetrafluoroethylene (binder), Pressed on the nickel mesh, as the negative electrode of the supercapacitor; use the nickel mesh as the co...

Embodiment 2

[0026] The polystyrene template is pretreated. The specific treatment method is: take a certain amount of polystyrene powder and disperse it in a PDDA (poly (diallyldimethyl-ammonium chloride) (molecular weight: 100,000, concentration: 2.0 wt.%) solution, soak 30 minutes, centrifuge and set aside.

[0027] Molybdenum trioxide is prepared according to the same method in Example 1, and the obtained molybdenum trioxide is a nanorod structure (scanning electron microscope collection is shown in the attached figure 1 b), the size of the nanostructure unit is 200 nm ′ 200 nm ′ 2 mm.

[0028] According to the same method in Example 1, the electrochemical performance test is carried out, and the cyclic voltammetry curve obtained under the scan rate of 1mV / s and the specific capacity under different scan rates are shown in the attached figure 2 and image 3 .

Embodiment 3

[0030] Weigh a certain amount of elemental molybdenum into a round-bottomed flask, add a certain amount of 30% hydrogen peroxide into the flask under ice-water bath conditions, stir and react to obtain a transparent yellow peroxomolybdic acid sol. Aging overnight, put into the crucible, as for the muffle furnace, with 1 o C / min rate heating up to 450 o C, kept for half an hour, cooled to room temperature, and obtained MoO with a spin-cone shape of 1 mm in size 3 (SEM spectra are shown in the attached figure 1 c). According to the same method in Example 1, the electrochemical performance test is carried out, and the obtained cyclic voltammetry curve and the specific capacity under different scanning speeds are also shown in the attached figure 2 and image 3 , test its energy density at different current densities, and calculate its power density, the results are shown in Figure 6 . The energy density was 31 Wh / kg at a power density of 421 W / kg.

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Abstract

The invention belongs to the technical field of chemical power sources, in particular to a super conductor. Negative electrode active substances of the super capacitor are oxide which has metal elements with two oxidation states except vanadium, and modified compounds of the oxide. The electrolyte of the super capacitor is aqueous solution containing alkaline metal ion. The negative active substance is the known active material. Compared with the conventional aqueous solution system super capacitor, the super capacitor has higher energy density and better safety performance. In addition, the capacitor also has excellent rate performance and better cycle performance. The super conductor has strong operability and good repeatability; and products produced by the super capacitor have stable product quality and good performance.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a supercapacitor. Background technique [0002] With the continuous expansion of the information society and the emergence of environmental and energy crises, the issue of energy storage and conversion efficiency is becoming more and more important. As we all know, supercapacitors have the characteristics of high power density, good cycle performance, and no memory effect (see: Wu Yuping, et al., "Green Power Materials". Beijing: Chemical Industry Press, 2008). However, with the development of technology, it is urgently required that the energy density of supercapacitors can be continuously improved, and at the same time, they must have good cycle performance and high safety performance. [0003] There are two types of supercapacitors commonly used at present: aqueous solution system and organic solution system. However, they basically use carbon mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/035
CPCY02E60/13
Inventor 唐伟田舒李琳琳刘丽丽施轶朱凯吴宇平
Owner FUDAN UNIV
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