A method for improving the specific capacitance of graphene-based supercapacitors
A supercapacitor, graphene-based technology, used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve problems such as low capacitance retention, and achieve excellent specific capacitance, good energy storage performance, and nitrogen doping. improved effect
Inactive Publication Date: 2018-10-26
BEIHANG UNIV
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The general result is lower specific capacitance and lower capacitance retention
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[0020] The present invention is described further below in conjunction with example, but the present invention is not limited to specific embodiment.
[0021] (1) Measure 5ml of 9.8mg / ml liquid crystal graphene oxide in a beaker, then add 245mg of sodium chloride and 245mg of urea, add deionized water to dilute the graphene oxide to 3mg / ml, add The rotor was subjected to magnetic stirring and ultrasonic vibration for 3 hours, and then stood still for one day to obtain a uniform liquid crystal graphene oxide / sodium chloride / urea mixed dispersion.
[0022] (2) Place the prepared liquid crystal graphene oxide / urea / sodium chloride dispersion on the glass substrate at the front edge of the scraper of the scraper coater, set the distance between the scraper and the substrate to 1mm, and advance the scraper at a specified speed of 120r / min, evenly The dispersion liquid was coated on the glass to form a liquid crystal graphene oxide / urea / sodium chloride film.
[0023] (3) Stand still...
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The invention relates to a method for increasing the specific capacitance of a graphene-based supercapacitor. An electrode of a supercapacitor is prepared from graphene, and the theoretical capacitance can be up to 550F / g. However, because of factors such as material properties and preparation techniques, generally the contained specific capacitance is within 150-300F / g. According to the method, sodium chloride and urea are doped into a graphene oxide solution of a liquid crystal state for the first time, a film is prepared from the solution by using a scraper in a coating manner, and thus a film obtained after hydrothermal reduction is adopted as the electrode of the supercapacitor. Due to added substances, graphitization stacking of graphene layers can be prevented and nitrogen doping can be achieved in the hydrothermal reduction process of the graphene film, so that the specific capacitance can be greater than 400F / g when aqueous electrolyte is used, and is at a relatively high level. The electrode of the graphene-based supercapacitor prepared by using the method is uniform in thickness, good in operability and simple to operate, in addition, the used raw materials are cheap, and the method is green. The process of the scraper coating method for preparing the film can be further improved, and can be applied to industrial production.
Description
technical field [0001] The invention belongs to the field of graphene-based supercapacitors, and the main content is a preparation technology of an energy storage electrode, which can realize relatively high specific capacitance. By adding other chemical substances to the aqueous solution of liquid crystal graphene oxide, the graphene in the film obtained by hydrothermal reduction after doctor blade coating can not only suppress the graphitization accumulation between the sheets in the way of bending and wrinkling, but also realize Nitrogen doping improves the charge storage capacity, and the specific capacitance exceeds 400F / g, which provides a technical route for preparing supercapacitors with high energy density. Background technique [0002] Supercapacitors are also commonly called electrochemical capacitors and electric double layer supercapacitors. It is a new type of energy storage device between batteries and capacitors. It has the characteristics of high power dens...
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IPC IPC(8): H01G11/86H01G11/36
CPCY02E60/13
Inventor 刘金章赵逸
Owner BEIHANG UNIV