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Asymmetric electrochemical capacitor and preparation method of asymmetric electrochemical capacitor

An electrochemical and asymmetric technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of limiting asymmetric electrochemical capacitors, polluting the environment, and time consumption, and achieves easy promotion and high power Good density and circulation

Active Publication Date: 2013-04-17
UNIV OF SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

The excellent prospects of carbon-containing asymmetric supercapacitors are very attractive, but the current synthesis and preparation methods of related electrode materials are quite time-consuming, costly, and pollute the environment. The defects of these methods greatly limit the practical application of asymmetric electrochemical capacitors.

Method used

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  • Asymmetric electrochemical capacitor and preparation method of asymmetric electrochemical capacitor
  • Asymmetric electrochemical capacitor and preparation method of asymmetric electrochemical capacitor
  • Asymmetric electrochemical capacitor and preparation method of asymmetric electrochemical capacitor

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preparation example Construction

[0036] The present invention further discloses a method for preparing the above-mentioned asymmetric electrochemical capacitor, which includes the following steps:

[0037] Step a) Preparation of positive electrode material: put the pyrolyzed bacterial cellulose in KMnO 4 and K 2 SO 4 Shake and react in the mixed solution for a period of time to obtain the positive electrode material p-BCMnO 2 . In this step MnO 4 - Generation of MnO by oxidation of carbon on the surface of pyrolyzed bacterial cellulose 2 , and finally the surface-coated nano-MnO 2 Particulate Carbon Composite Cathode Material p-BCMnO 2 , in order to make the surface of the pyrolyzed bacterial cellulose covered with nanometer MnO as much as possible 2 Microparticle coating, the shaking reaction time is preferably 0.5h-2.5h, the temperature is preferably 20°C-60°C, and the rotation speed is preferably 50rpm-300rpm. Due to the three-dimensional porous network structure and high conductivity of the pyrol...

Embodiment

[0047] 1. Preparation of cathode material:

[0048] Bacterial cellulose (BC) was frozen with liquid nitrogen for 1 hour, then freeze-dried in a freeze dryer at a pressure of 0.04 mbar for 4 days, and then pyrolyzed at 1000 °C for 2 hours under nitrogen protection to obtain pyrolyzed bacterial cellulose ( p-BC).

[0049] Weigh four pieces of 2-3mg p-BC materials and soak them in four pieces of 30mL KMnO 4 and K 2 SO 4 The beaker of the mixed solution, in which KMnO 4 The concentration is 0.1mol / L, K 2 SO 4 The concentration of the solution is 0.1mol / L, react in a shaking table at 100rpm at 30°C for 0.5h, 1.5h, 2h, and 2.5h respectively, after the reaction, wash with deionized water until the washing liquid is colorless, and obtain the positive electrode material p -BCMnO 2 . In order to distinguish the cathode materials prepared under different reaction times, p-BCMnO is used in the following description 2 -xh represents the positive electrode material, where x represe...

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Abstract

The invention provides an asymmetric electrochemical capacitor and a preparation method of the asymmetric electrochemical capacitor. The prepared asymmetric electrochemical capacitor comprises a positive electrode, a negative electrode, electrolyte, a diaphragm and a current collector, wherein the positive electrode is made of p-BC@MnO2, and the negative electrode is made of p-BC / N, wherein the p-BC is pyrolyzed bacterial cellulose. The asymmetric electrochemical capacitor provided by the invention has the advantages that the bacterial cellulose with low cost and rich yield is used as electrode raw materials, the prepared asymmetric electrochemical capacitor has high specific capacitance, good cyclicity and high stability, and high energy density and power density are realized.

Description

technical field [0001] The invention relates to the field of electrochemical capacitors, in particular to an asymmetric electrochemical capacitor and a preparation method thereof. Background technique [0002] Electrochemical capacitors, also known as supercapacitors, are a new type of energy storage device between capacitors and batteries. Compared with traditional capacitors, electrochemical capacitors have higher specific capacity, higher specific power than batteries, can release large current instantly, have short charging time, high charging efficiency, long cycle life, no Advantages such as memory effect and basic maintenance-free. Therefore, electrochemical capacitors have great potential application value in the fields of mobile communications, consumer electronics, electric vehicles, and aerospace. [0003] At present, the electrode materials of electrochemical capacitors are mainly divided into three categories: metal oxides, conducting polymers, and hybrid mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86
CPCY02E60/13
Inventor 俞书宏陈立锋黄志红
Owner UNIV OF SCI & TECH OF CHINA
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