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A kind of all-solid asymmetric capacitor and its preparation method

An asymmetric capacitor, all-solid-state technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of poor conductivity of positive electrode materials, achieve high specific capacitance, controllable shape, and simple and novel preparation methods Effect

Active Publication Date: 2018-02-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide an all-solid asymmetric capacitor and its preparation method, wherein the key electrode material structure and composition, the corresponding preparation method process steps, and The improvement of the reaction conditions can effectively solve the problem of poor conductivity of the current all-solid capacitor positive electrode material compared with the prior art, and the preparation method is simple to operate, the morphology of the positive and negative electrode materials is controllable, and the prepared capacitor has high The specific capacitance, energy density and power density of

Method used

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  • A kind of all-solid asymmetric capacitor and its preparation method
  • A kind of all-solid asymmetric capacitor and its preparation method
  • A kind of all-solid asymmetric capacitor and its preparation method

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Embodiment 1

[0028] The all-solid asymmetric capacitor in Example 1 is composed of a positive electrode, a diaphragm, a solid electrolyte and a negative electrode, and is prepared according to the following steps:

[0029] (1) Clean nickel foam is used as current collector;

[0030] (2) Preparation of negative electrode polypyrrole nanowire material: use a mixed solution containing 0.01M sodium perchlorate, 0.15M pyrrole monomer and 0.2M disodium hydrogen phosphate as the electropolymerization solution, and deposit on nickel foam by constant potential deposition method 10min to obtain polypyrrole nanowires.

[0031](3) Preparation of positive electrode polypyrrole nanowire@nano manganese dioxide composite material (that is, polypyrrole nanowire composite material with nano manganese dioxide attached): at room temperature (also at other temperatures, such as 20 ° C ~ 40 ℃), immerse the nickel foam with polypyrrole nanowires in 50mM ~ 100mM potassium permanganate, and react in the dark for ...

Embodiment 2

[0036] This embodiment 2 is to carry out the charging and discharging performance test on the all-solid-state asymmetric supercapacitor provided in embodiment 1, and the results are as follows image 3 shown.

[0037] The specific charge and discharge performance test can be performed by using a three-electrode system for cyclic voltammetry test to test the electrochemical energy storage performance of the all-solid capacitor of the present invention. The test system can be a CHI760E electrochemical workstation, and the charge-discharge cycle test is carried out within the range of 0-1.6V potential range, and the charge current density is 1, 2, 4, 6, 10mA / cm 2 . The electrochemical performance test results show that when the all-solid capacitor prepared in the present embodiment 1 is 1mA / cm at a current density 2 , its area capacitance can be as high as 672mF·cm -2 .

[0038] Such as figure 1 As shown, from the negative electrode to the positive electrode of the capacitor...

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Abstract

The invention discloses an all-solid asymmetric capacitor and a preparation method thereof, wherein the all-solid asymmetric capacitor sequentially includes a negative electrode, a first solid electrolyte, a diaphragm, a second solid electrolyte, and a positive electrode; the positive electrode is attached with nano The polypyrrole nanowire composite material of manganese dioxide, the negative electrode is the polypyrrole nanowire. Compared with the prior art, the present invention can effectively solve the problem of poor conductivity of the positive electrode material of the current all-solid capacitor by improving the structure and composition of the key electrode material, the corresponding preparation method process steps, and the reaction conditions, and the present invention The preparation method is simple to operate, the morphology of the positive and negative materials is controllable, and the prepared capacitor has high specific capacitance, energy density and power density.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and more specifically relates to an all-solid asymmetric capacitor and a preparation method thereof. The capacitor uses polypyrrole nanowire@nanometer manganese dioxide and polypyrrole nanowire as positive and negative electrodes respectively The asymmetric capacitor is an all-solid-state asymmetric supercapacitor. Background technique [0002] As a new type of energy storage device between traditional capacitors and batteries, supercapacitors have the advantages of high charge and discharge rates, environmental protection, long cycle life, and high power density. a wide range of applications. However, the energy density of commercial supercapacitors is relatively low, which greatly hinders the process of replacing traditional batteries. Therefore, it is very important to increase the energy density of supercapacitors. According to the energy density formula E=1 / 2CV 2 (E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/46H01G11/48H01G11/24H01G11/86
CPCY02E60/13
Inventor 刘宏芳董爽王正运肖菲
Owner HUAZHONG UNIV OF SCI & TECH