High-performance nickel-cobalt oxide composite nanowire film for super capacitor
A supercapacitor, nickel-cobalt oxide technology, applied in the direction of capacitors, electrolytic capacitors, hybrid capacitor electrodes, etc., can solve the problems of unstable alkaline environment, easily damaged sheet structure, low mass specific capacity, etc., and achieve good cycle performance, The effect of simplifying the electrode preparation process and high-quality specific capacity
Inactive Publication Date: 2012-10-03
CHONGQING UNIV
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Problems solved by technology
Although the membranes mentioned in 1-4 above have high capacity, the cycle performance is not good. The main reason is that the Ni(OH) prepared by electrochemical deposition and chemical water bath precipitation 2 、Co(OH) 2 Most of them are porous membranes composed of nano-scale flakes. OH- ions are easy to destroy the flake structure during the process of intercalation and extraction, and the growth is not strong enough to easily fall off the base. Although the fifth type of membrane has good cycle performance, its quality The specific capacity is low, and most of these films are based on nickel, which is unstable to alkaline environments and will be limited in practical use
Method used
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example 1
[0048] The cyclic voltammetry performance test of the different scan rates of example 1 is as Figure 5 As shown, the constant current charge and discharge performance test is as follows Image 6 shown.
[0049] Table 2. Mass specific capacity performance data table of example 1 Unit: F / g
[0050]
[0051] The sample of Example 1 with the best performance has been tested for charge-discharge cycle performance, such as Figure 7 As shown, the sample cycled 3000 cycles at a charge-discharge current density of 16A / g, and the capacity changed from 2424F / g to 2307F / g, maintaining 95.2%.
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Abstract
The invention discloses a high-performance nickel-cobalt oxide composite nanowire film for a super capacitor. Nickel salt and cobalt salt are used as raw materials, the nickel-cobalt composite nanowire film is generated on a metal titanium substrate, wherein the molar ratio of nickel salt and cobalt salt is 1-5:1-5. The film not only has the advantages of larger specific surface area, simplification in electrode preparation process, alkaline environment stability and the like, but also has excellent super capacitance performance, such as high quality specific capacity and favorable cycle performance, and is an excellent electrode material for the super capacitor in electrochemistry.
Description
technical field [0001] The invention belongs to the field of electrochemical supercapacitors, in particular to a high-performance nickel oxide-cobalt composite nanowire film for supercapacitors. Background technique [0002] Electrochemical supercapacitor is a new energy storage element between traditional capacitors and batteries. It has the characteristics of high specific power of traditional capacitors and high specific capacity of batteries, long cycle life, and wide operating temperature range. It is widely used in electric vehicles, communications, aerospace, signal control and other fields. Electrode materials are the core of supercapacitor performance and the key factor to improve capacitance performance. The development of electrode materials with superior performance has become the goal that researchers have been pursuing for a long time. Nickel oxide and cobalt oxide have become the most popular materials for making supercapacitors due to their high theoretical ...
Claims
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IPC IPC(8): H01G9/058H01G11/46
Inventor 肖鹏杨飞姚建玉周明张云怀何辉超李小玲蒙小琴王志峰袁履辉
Owner CHONGQING UNIV
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