33 results about "Applications of capacitors" patented technology

The invention relates to the technical field of inorganic nonmetallic materials, in particular to a low-loss high-voltage ceramic capacitor dielectric. By adopting a conventional ceramic capacitor dielectric preparation method and using common chemical raw materials for capacitor ceramic, a lead-free and cadmium-free low-loss high-voltage ceramic capacitor dielectric is prepared and the sintering temperature of the capacitor ceramic can be reduced. The dielectric is suitable for preparing monolithic ceramic capacitors or chip multi-layer ceramic capacitors, the cost of the ceramic capacitors can be greatly reduced, the withstand voltage can be improved and the losses can be reduced to expand the application scope of the ceramic capacitors, the safety of the ceramic capacitors can be greatly improved and the environment is not polluted during preparation and use at the same time.

The invention relates to a lead-free ceramic material with high energy density and charging and discharging properties and a preparation method of the lead-free ceramic material. The composition of the ceramic is (1-x) BaTiO3-x(Bi0.9Na0.1) (In1-yZry)O3 (0< / = x< / = 0.2, 0.1< / = y< / = 0.3), and the ceramic is obtained by a common sintering method. Compared with a lead-based antiferroelectricity material, the material disclosed by the invention does not contain lead, and is an environmentally friendly material. Compared with an antiferroelectricity material, the system disclosed by the invention hasquite high energy storage density, current density and power density, and has microsecond charging and discharging time. By the characteristic, application of a pulse type capacitor is greatly facilitated. The material is simple in manufacturing process, has excellent charging and discharging properties, and is suitable for being used on a high-voltage pulse capacity with requirements on energy storage and charging and discharging characteristics.

The invention relates to a preparation method for constructing an ion channel with polyvinyl alcohol as a base at room temperature and its application as a solid electrolyte for a supercapacitor. The material uses polyvinyl alcohol and nucleoside guanine as the main raw materials, and at the same time, boric acid is added to cross-link the polyvinyl alcohol chain, and a hydroxide electrolyte is added to naturally polymerize at room temperature to form a gel. The material is used as a solid electrolyte in a supercapacitor, and has the characteristics of high ionic conductivity, good bendability, and strong self-healing ability. The preparation method of the material is simple, which provides a possibility for wide production and application.

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 discloses an LDH-based supercapacitor composite electrode material, a preparation method and an application. The MnCo LDH nanowire array based on nickel foam was first prepared by hydrothermal method; then the MnCo LDH / C rough nanowire array based on nickel foam was prepared by calcination and carbonization; and then the NiMn ‑LDH nanosheets and MnCo‑LDH / C nanowires are combined to form a three-dimensional core-shell structure. Compared with other nanostructures such as nanoparticles, the formation of a three-dimensional core-shell nanowire array is conducive to giving full play to its electrochemical activity; the composite material is used as a super When the capacitor electrode material is applied, it can be used as a pseudocapacitive electrode material with high specific capacitance and rate charge and discharge performance; at the same time, it can also be used as anode material for supercapacitor devices with high energy density.

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 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 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.