33 results about "Applications of capacitors" patented technology

The invention relates to the technical field of inorganic nonmetallic materials, in particular to a high voltage ceramic capacitor dielectric sintered at the low temperature of 930 to 980 DEG C. The lead-free and cadmium-free high dielectric high voltage ceramic capacitor dielectric is prepared from ordinary chemical raw materials of capacitor ceramics by adopting a conventional ceramic capacitordielectric preparation method, and the sintering temperature of the capacitor ceramics can be greatly reduced. The dielectric is suitable for the preparation of a monolithic ceramic capacitor and a multilayer chip ceramic capacitor, can greatly reduce the cost of the ceramic capacitor, simultaneously improve voltage resistance to widen the application range of the ceramic capacitor, and avoid environmental pollutions in preparation and using processes.

The invention relates to the field of high-voltage reactive power compensation devices, in particular to the application of a capacitor integrated online monitoring technology in a high-voltage reactive power compensation device. In the application, a capacitor online monitoring loop, a full-film high-voltage parallel capacitor, a fuse, a permanent magnet mechanism vacuum contactor, a high-voltage reactive power integrated compensation controller and a fault protection loop are involved. A knee-protective and shoulder-protective healthcare massager has the advantages that: the problem that the capacitor integrated online monitoring technology is applied to an intelligent maintenance-free distributed high-voltage reactive power compensation device is focused to be solved; and the outstanding problems that equipment is easy to damage, not easy to use, difficult to maintain and the like in practical application are solved.

The invention discloses an electrolyte for a high-voltage super-capacitor and a preparation method of the electrolyte and belongs to the technical field of super-capacitors. The electrolyte is composed of a traditional electrolyte and a carbon nano-material, and the mass fraction of the carbon nano-material is 0.01%-1%; and the traditional electrolyte is selected from an organic electrolyte or an ionic liquid, and the carbon nano-material is one or more of a carbon nano-tube, nano-graphite and nano-carbon granules. The preparation method of the electrolyte includes in the environments with the oxygen content of 0.1-1 PPM and the water content of 0.1-1 PPM, subjecting the carbon nano-material to ultrasound treatment for 2-50 hours at the temperature of 20-60 DEG C under the power of 30-3000W or stirring the carbon nano-material for 2-50 hours at the rotation speed of 300-40000 revolutions per minute, so that the carbon nano-material can be dispersed in the traditional electrolyte. The electric conductivity of the electrolyte is 1.3-2 times that of the traditional electrolyte, the service life of the capacitor is prolonged, costs are saved, and application ranges of the capacitor are broadened.

The invention relates to a preparation method of a graphene-like structured carbon electrode material. The method comprises the following steps: immersing dried shell biomasses in an aqueous solution of a nickel salt, and drying the shell biomasses I; charring the shell biomasses in an inert atmosphere at 650-750 DEG C, immersing the charred shell biomasses in an aqueous solution of an acid, and filtering the obtained product to obtain a charred product; and immersing the charred product in an aqueous solution of an alkali, drying the obtained charred product, activating the dried charred product in an inert atmosphere at 650-750 DEG C, and cooling and washing the activated charred product until the product is neutral in order to obtain the graphene-like structured carbon electrode material. The invention also discloses an application of the graphene-like structured carbon electrode material, prepared through the method, as a capacitor. Raw materials are economical and can be easily obtained, and are processed through a simple catalytic activation technology to prepare the graphene-like structured carbon electrode material; and a research direction is provided for the large-scale production of carbon electrode supercapacitors from the shell biomasses.

The invention discloses a preparation method of a Mn7O13.5H2O/alpha-Fe2O3 composite, and relates to the technical fields of material preparation and application of capacitor electrode materials. The method provided by the invention comprises the steps that (1) a hexagonal alpha-Fe2O3 nanosheet is prepared; (2) the hexagonal alpha-Fe2O3 nanosheet is crystallized; (3) a Mn7O13.5H2O/alpha-Fe2O3 nanosheet composite is prepared. The invention further provides the Mn7O13.5H2O/alpha-Fe2O3 composite prepared by the preparation method and the application of the composite in a supercapacitor electrode.According to the invention, the Mn7O13.5H2O/alpha-Fe2O3 composite has good capacitance characteristics, exhibits excellent electrochemical performance under a three-electrode system, and can be widelyapplied to supercapacitor electrode materials.

The invention discloses a high thermal stability titanium dioxide-based ceramic material and a preparation method thereof. The ceramic material has the formula of (Cu1/4M3/4)xTil-xO2, in the formula,M represents Nb or Ta, and x is 0.005-0.02. The ceramic material disclosed by the invention is simple in preparation method, good in repeatability and high in finished product rate; due to introduction of CuNb or CuTa into the titanium dioxide-based ceramic material, the ceramic material has a high dielectric constant and a low dielectric loss within a frequency of 40-160Hz, when x is 0.005, the dielectric loss is constantly kept as 0.08 or less within a frequency testing range, meanwhile, the ceramic material has high thermal stability, and within a temperature range of minus 200 DEG C to 200DEG C, CuNb or CuTa codoped titanium dioxide ceramic respectively meets application requirements of X9F and X9E ceramic capacitors. Compared with an X9R ceramic capacitor, the ceramic material disclosed by the invention has a low capacitance change rate and good thermal stability and practicability, and has the potential of being applied to electronic markets such as multi-layer ceramic capacitors.

The present invention discloses a titanium dioxide and cobalt aluminum hydrotalcite heterojunction inorganic composite material and application with the inorganic composite material as a photo-charging supercapacitor. A hydrothermal method is used to grow TiO2 nanorods on the FTO; and the mixture of cobalt nitrate, aluminum nitrate and sodium nitrate is taken as an electrolyte, the FTO for growingthe TiO2 nanorods is taken as a working electrode, Ag/AgCl is taken as a reference electrode, and the Pt wire is taken as a counter electrode, and the cobalt aluminum hydrotalcite is deposited on theTiO2 nanorods by using a three-electrode method. The titanium dioxide and cobalt aluminum hydrotalcite heterojunction inorganic composite material prepared by the present invention has a simple operation, good stability and a strong light response; and the nanometer TiO2 is taken as a light absorber to convert light energy into chemical energy, the cobalt aluminum hydrotalcite is taken as an energy storage element to convert the chemical energy into the light energy, and under the illumination, the light energy is converted into the chemical energy to be stored in supercapacitors, so that thelimitation of solar energy by season and no light is broken through.

The invention belongs to the technical field of capacitors, and discloses a method for calculating the discharge time of a capacitor, and a mobile terminal. The method comprises the following steps that: a capacitor chip acquires a voltage U1 before the capacitor discharges; the capacitor chip acquires a voltage U2 after the capacitor discharges; the capacitor chip calculates discharge capacity according to the voltage U1 before the capacitor discharges and the voltage U2 after the capacitor discharges, wherein the discharge capacity is calculated according to formulas: Q=C*(U1-U2) and discharge capacity=Q*1/3.6milliampere*hour; and the capacitor chip calculates the discharge time of the capacitor according to a clock electrically connected with the capacitor chip, wherein the discharge time of the capacitor is calculated according to a formula: T=discharge capacity/consumed current. By the method, when the voltages on the two sides of the capacitor change, the capacity of the capacitor can be accurately calculated and the time is calculated according to the capacity of the capacitor, so that the application of the capacitor is expanded.

The invention relates to a preparation method and application of a carbon paper derived flexible current collector, and belongs to the technical field of materials. The preparation method of the carbon-paper-derived flexible current collector comprises the following steps: attaching a polyimide adhesive tape to three-dimensionally woven carbon paper, and applying pressure to enable the polyimide adhesive tape to be tightly attached to the three-dimensionally woven carbon paper; and stripping off the polyimide adhesive tape to obtain carbon paper, namely the carbon paper-derived flexible current collector. The synthesized carbon paper derived flexible current collector has good flexibility and mechanical strength, the surface of the current collector has a three-dimensional porous structure with longitudinal and transverse gullies, compared with original carbon paper with a relatively smooth surface, the surface of the current collector is rougher, the specific surface area is remarkably increased, loading of more active materials is facilitated, the current collector can be used for preparing some flexible energy storage devices, and the application prospect is wide. The flexibility of the capacitor is improved, and the application of the capacitor is greatly expanded.