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Positive electrode and application of positive electrode in supercapacitor

A technology for supercapacitors and positive poles, which is applied to positive poles and its application in supercapacitors, can solve the problems of poor electrode cycle life and low capacity, and achieve the effect of improving cycle life

Inactive Publication Date: 2014-08-27
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem of existing MnO as positive electrode 2 The disadvantages of poor electrode cycle life and low capacity provide a MnO with better capacity properties and cycle life 2 positive electrode

Method used

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  • Positive electrode and application of positive electrode in supercapacitor
  • Positive electrode and application of positive electrode in supercapacitor
  • Positive electrode and application of positive electrode in supercapacitor

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0028] Cut commercially available nickel foam (thickness 1.8mm, pore density 110PPI) into small pieces, then soak in acetone, rinse with secondary water after ultrasonic treatment for a few minutes, and then soak it in a volume ratio of 1:2 ( 37.5wt% concentrated hydrochloric acid: secondary water) hydrochloric acid aqueous solution for several minutes, and then washed with secondary water several times until neutral.

[0029] The above-mentioned treated and dried nickel foam was used as the working electrode, the saturated calomel electrode (SCE) was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. First with Mn(CH 3 COO) 2 The aqueous solution is the electrolyte, and the electrodeposition is performed at a voltage of about 1.0 V (vs. SCE), and the MnO is controlled by controlling the depo...

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Abstract

The invention discloses a positive electrode which comprises a base body. The base body is loaded with MnO2, and the surface of the MnO2 is loaded with Co3O4. The positive electrode is prepared through the following steps that (1) the MnO2 is arranged on the base body through electro-deposition; (2) cobalt hydroxide is arranged on the base body, provided with the MnO2 through electro-deposition, and heat treatment is then conducted on the base body. By means of the positive electrode, the cycle life of a MnO2 electrode can be prolonged remarkably, specific capacity of the MnO2 electrode can be increased, and resistance of the MnO2 electrode can be decreased as well. The positive electrode can serve as the positive electrode of a supercapacitor.

Description

technical field [0001] The invention specifically relates to a positive electrode and its application in supercapacitors. Background technique [0002] MnO 2 Due to its high theoretical specific capacitance, low cost, no pollution, low toxicity, and wide potential window, it is widely used as the cathode material of supercapacitors. However, the currently prepared MnO 2 Electrodes generally have the disadvantages of low actual specific capacity and poor cycle life in aqueous solution, which limit the practical application. The reasons mainly include the following two points: 1. The utilization rate of the electrode active material prepared by the tablet method is low, resulting in an unsatisfactory electrode capacity. 2. MnO 2 The mechanical strength of the electrode material itself is low, the structure of Mn oxide is unstable, and MnO in aqueous solution 2 Over-reduction will lead to its dissolution and limit the cycle life of the electrode. [0003] In order to sol...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/86
CPCY02E60/13
Inventor 徐彩玲赵永青张漩辛宾宾
Owner LANZHOU UNIVERSITY