21results about How to "Improve power characteristics" patented technology

The present invention relates to a SiC@C nanowire quasi-array with a core-shell structure and a preparation method and application thereof, and belongs to the technical field of nanomaterials. The present invention discloses a SiC@C nanowire quasi-array with a core-shell structure, wherein the phase composition of SiC in the SiC@C nanowire quasi-array is 3C-SiC, and the C of the shell layer is a carbon material doped with sulfur after freeze-drying and carbonization of a PEDOT layer. The present invention also discloses a preparation method of a SiC@C nanowire quasi-array with a core-shell structure, wherein the preparation method comprises: covering the pretreated carbon cloth on the crucible mouth containing polysilazane and melamine powder, heating in a high-temperature atmosphere furnace, and cooling to obtain a carbon cloth depositing a SiC quasi-array; arranging the carbon depositing SiC nanowires in a reaction vacuum chamber, inducing gaseous EDOT into the reaction vacuum chamber, and introducing gaseous FeCl3 into the reaction vacuum chamber to deposit a SiC@PEDOT nanowire quasi-array, and washing, freeze-drying, and carbonizing to obtain a sulfur-doped SiC@C nanowire composite material.

An embodiment of the present invention provides a positive electrode active material for a lithium secondary battery. The positive electrode active material for a lithium secondary battery includes: first lithium metal phosphorus oxide particles having a single particle form; and second lithium metal phosphorus oxide particles containing iron and manganese and having a secondary particle form in which primary particles are aggregated.

Provided is a positive electrode active material that improves charge / discharge cycle characteristics of a non-aqueous electrolyte secondary battery and suppresses an increase in resistance. The positive electrode active material contained in the nonaqueous electrolyte secondary battery contains a lithium transition metal composite oxide, the lithium transition metal composite oxide contains Ni, Ca, and Sr, and contains secondary particles formed by aggregating primary particles, and in the element concentration distribution in the cross section of the lithium transition metal composite oxide using time-of-flight secondary ion mass spectrometry, the element concentration distribution in the cross section of the lithium transition metal composite oxide is less than the element concentration distribution in the cross section of the lithium transition metal composite oxide, and the element concentration distribution is less than the element concentration distribution in the cross section of the lithium transition metal composite oxide. The Gini coefficient of the surface of the secondary particles of Ca and Sr is 0.7 or less, and the Gini coefficient of the interior of the secondary particles of Ca and Sr is 0.6 or less.

The invention discloses a functional electrolyte in the technical field of electrolytes, and a preparation process of the functional electrolyte comprises the following steps: fully and uniformly mixing a carboxylic ester solvent and a fluorinated organic solvent, then adding lithium hexafluorophosphate and one or more lithium salts, heating and stirring for dissolving, then adding a multifunctional additive with a certain mass ratio, and stirring for dissolving to obtain the functional electrolyte. And stirring until the additive is completely and uniformly dissolved to obtain the functional electrolyte of the technical scheme. The functional electrolyte disclosed by the invention has higher oxidation potential and ionic conductivity at high and low temperatures, and the lithium ion capacitor assembled by the functional electrolyte has excellent high and low temperature discharge performance and can meet discharge in an environment of-40 DEG C to 60 DEG C. And meanwhile, high-rate (10C charging / 20C discharging) long cycle performance and high power characteristic can be realized.

The invention relates to a composite diaphragm. The composite diaphragm comprises a porous base material; and a ceramic layer formed on one surface or both surfaces of the porous substrate and containing inorganic particles and a binder, in which the binder contains polyacrylamide and carboxymethyl cellulose having a weight average molecular weight of 180000 g / mol or more and a degree of substitution of 0.6 to 1.2 in a weight ratio of 60 to 90: 40 to 10, the composite diaphragm can simultaneously satisfy excellent mechanical stability, thermal stability and ionic conduction characteristics.

The application discloses an ultra-wideband GaAs amplitude-phase control transceiver front-end chip, which is applied to the field of phased array radars, and aims at the fact that high-low pass type phase shifters adopted in existing transceiver front-end chips are only applicable to low-frequency phase shift units, and are limited by the problem of filter order; the application proposes a novel phase shift structure based on a magnetic coupling all-pass network and an active complementary dual-mode amplification circuit, the structure can realize a great expansion of available frequency on the premise of ensuring phase shift precision, and a 180-degree phase shift network based on an active structure can effectively provide transmission gain, reduce the number of used link amplifiers, further reduce the noise coefficient of a receiving link and assist in improving the power characteristics of a transmitting link. The application of the technology helps to realize good phase shift precision, input and output return loss and lower phase shift error of the chip in an ultra-wideband range of 2-18GHz.

A positive electrode active material for a lithium secondary battery according to an embodiment of the present invention contains lithium metal oxide particles containing cobalt and aluminum. The lithium metal oxide particles have a secondary particle form in which primary particles are aggregated, and the ratio of the weight of aluminum contained in the primary particles to the weight of cobalt satisfies a predetermined relational expression. According to the present invention, a positive electrode having improved structural stability and high-temperature stability and having high energy density and high power characteristics can be realized.

The invention provides a printed circuit board. The printed circuit board includes a first wiring portion having a first insulating body and a plurality of first wiring layers. An uppermost first wiring layer of the plurality of first wiring layers is embedded on an upper side of the first insulating body, and at least a portion of an upper surface of the uppermost first wiring layer is exposed from an upper surface of the insulating body. The second wiring portion is disposed below the first wiring portion and includes a second insulating body and a plurality of second wiring layers. An electronic component is embedded in the first insulating body and partially exposed. The plurality of first wiring layers and the plurality of second wiring layers are electrically connected to each other. A minimum pitch of the wirings included in each of the plurality of first wiring layers is smaller than a minimum pitch of the wirings included in each of the plurality of second wiring layers.

The application provides a vehicle inverter, which comprises a printed circuit board, a DC busbar unit and an AC busbar unit. The printed circuit board comprises power devices and a gate drive circuit for driving the power devices to be turned on or turned off. The DC busbar unit comprises a first DC busbar welded on a first side of the printed circuit board. The first DC busbar comprises a plurality of DC busbar combinations, each of which comprises a DC positive busbar and a DC negative busbar. At least part of the area between the DC positive busbar and the DC negative busbar is arranged in an interlaced manner. The AC busbar unit is welded on a second side of the printed circuit board. The AC busbar unit is connected to output terminals of the power devices and a load, respectively, so as to drive the load based on the turning on or turning off of the power devices. The power characteristics of the power semiconductor in the inverter can be effectively improved.

The invention discloses a polyanion-doped sulfate carbon-coated sodium ion composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a mixed solution of titanium citrate and ammonium sulfate; (2) mixing high-purity water, citric acid, vanadium salt, manganese salt, phosphate, sodium salt and the mixed solution obtained in the step (1) to prepare a sodium ion positive electrode material precursor mixed solution; (3) heating the mixed solution obtained in the step (2) to obtain precursor sol; (4) performing spray drying on the precursor sol to obtain a precursor; and (5) sintering, crushing and drying the precursor in a protective gas atmosphere to obtain the positive electrode material. The positions of sodium ions and manganese ions in the positive electrode material particles are prevented from being mutually occupied, and the sodium ions are more easily removed. And the conductive carbon film is coated to form a nanofiber channel with electron conduction, sodium ion conduction and high heat conduction, so that the energy and power characteristics of the positive electrode material are greatly improved.

The present invention relates to a novel method for producing a poly-spheroidal graphite, a poly-spheroidal graphite produced using the method, and a secondary battery comprising the poly-spheroidal graphite as an anode active material. Specifically, the present invention relates to a novel method for producing a spheroidized graphite having a small specific surface area (excellent initial efficiency and excellent high power for a secondary battery) using natural graphite, a spheroidized graphite produced using the method, and a secondary battery comprising the spheroidized graphite as an anode active material.

The invention belongs to the technical field of energy storage, and particularly relates to active slurry, a positive pole piece as well as a preparation method and application thereof. The invention relates to an active slurry, which comprises an active material and an organic solvent, and the solid content of the active slurry is 45wt%-60wt%; the active material comprises the following raw materials in percentage by mass: 93.5 wt%-97.5 wt% of an active substance; 1.5 wt% to 4.0 wt% of a binder; and 1.0 wt%-2.5 wt% of a conductive substance.

The utility model relates to the technical field of batteries, and particularly discloses a large-current current collector and pole connecting structure and a battery, the connecting structure comprises a second busbar and a first busbar, the second busbar comprises a busbar body II, a busbar body I and a connecting edge which are integrally formed, an included angle is formed between the busbar body II and the busbar body I. The first busbar comprises a busbar body III. The second busbar is connected with the pole through the connecting edge, the first busbar is connected with the current collector, and the second busbar is connected with the first busbar through the busbar body II; the battery comprises a cover plate, a roll core and a shell, wherein a pole on the cover plate is connected with current collectors at two ends of the roll core through the connecting structure. The lithium ion battery has the advantages of strong over-current capability, less heat generated by over-current and compact structure, and is favorable for reducing the space volume ratio of inactive substances in the battery, improving the volume energy density and reducing the material cost.

The invention discloses a carbon nanotube-coated carbon-coated manganese titanium vanadium sodium phosphate composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) firstly preparing a citric acid titanium complex solution; (2) preparing a citric acid aqueous solution, and adding vanadium salt, manganese salt, phosphate, the titanium complex solution and sodium salt into the citric acid aqueous solution to prepare a mixed solution; (3) heating the mixed solution, and carrying out heat preservation to obtain first precursor sol; (4) adding a carbon nanotube absolute ethyl alcohol dispersion liquid into the first precursor sol, and uniformly stirring to obtain a second precursor sol; (5) performing spray drying to obtain a precursor; and (6) sintering in a protective gas atmosphere, and then cooling and crushing to obtain the composite material. The preparation method disclosed by the invention is feasible in operation and controllable in cost, carbon nanotube channels with electron conduction, sodium ion conduction and high heat conduction are formed in situ in the particles of the obtained positive electrode material, and the energy and power characteristics of the positive electrode material are greatly improved.

This invention relates to a lead-acid battery, belonging to the field of lead-acid battery technology, to solve the problems of uneven current distribution and short cycle life of existing lead-acid batteries. The lead-acid battery includes a single cell, which comprises multiple positive and negative plates arranged in alternating layers. Each positive and negative plate includes a frame and tabs. The frame includes an upper frame, a lower frame, a left frame, and a right frame. Each positive and negative plate has a first tab and a second tab, symmetrically arranged along the length of the upper frame. The plane containing the first and second tabs is parallel to the plate surface. In the positive plate, the distance between the first and second tabs is d1; in the negative plate, the distance between the first and second tabs is d2, where d1 and d2 are different. In the positive plate, the first and second tabs are of the same size. The lead-acid battery of this invention has a long service life.

The utility model discloses an adjustable voltage pulsation adapter, which comprises an input filter, a bridge rectifier, an active PFC (Power Factor Correction), an analog controller and a DCDC (Direct Current to Direct Current) converter, after being connected to the input filter, commercial power is rectified by the bridge rectifier and then input to the active PFC. The output end of the active PFC is connected with the input end of the DCDC converter; and the rectification part of the DCDC converter directly outputs. Compared with the prior art, under the condition that direct-current square waves are effectively guaranteed, pulsating waveforms are independently controlled, the power characteristic of pulsating voltage is improved, pulsating voltage of any base point is achieved, and output pulsating voltage and direct-current base point voltage can be adjusted and set. The design can meet the requirements for different pulsating voltage auxiliary values and different frequencies, and the adaptability in different industries is improved.

The invention relates to the technical field of solid-state batteries, in particular to sulfide composite solid electrolyte and a preparation method thereof. According to the preparation method of the high-performance glassy state sulfide solid electrolyte, a modified sulfide positive electrode material is doped in the sulfide solid electrolyte, and nickel and iron elements are introduced, so that the proportion of a glassy state phase in the sulfide solid electrolyte is increased, and the lithium ion conductivity of the sulfide solid electrolyte is remarkably improved; the interface contact resistance is reduced, the composition of the SEI film is improved, and the power characteristic and the cycle life of the solid battery are improved. Acrylate has the characteristics of stable and excellent adhesive force, good lithium ion transmission characteristic, good elasticity, good flame retardance and the like, so that the sulfide solid electrolyte has a viscous surface, the interface contact resistance is reduced, meanwhile, the safety of a battery adopting the sulfide composite solid electrolyte is improved, and the combustible risk is reduced.

The method of preparing a negative active material for a secondary battery according to an exemplary embodiment of the present application includes adding a negative active material powder and a first binder powder to a mixer, adding a first solvent and performing first mixing to form a primary negative electrode composition, and after forming the primary negative electrode composition, adding a second binder powder to the mixer and performing second mixing to form a negative electrode composition.

This invention relates to a bifunctional co-solvent wide-temperature lithium-ion battery electrolyte and its application. The wide-temperature lithium-ion battery electrolyte is composed of lithium salt, organic solvent, thionyl chloride, tris(trimethylsilane)phosphate, and additives. The lithium-ion battery prepared with the bifunctional co-solvent wide-temperature electrolyte of this invention effectively broadens the operating temperature range, improves high-temperature cycle performance and low-temperature discharge performance, and features a wide operating temperature range, high specific energy, and long cycle life. Furthermore, it exhibits excellent thermal stability and good safety performance.

The invention relates to a composite diaphragm. The composite diaphragm comprises a porous base material; and a ceramic layer which is formed on one surface or both surfaces of the porous substrate, and which contains inorganic particles and a binder, in which the average particle diameter (D50) of the inorganic particles is 0.20 [mu] m to 0.40 [mu] m, and in a particle size distribution diagram of the inorganic particles, the particle size distribution diagram of the inorganic particles is greater than the particle size distribution diagram of the inorganic particles, the particle size distribution diagram of the inorganic particles is greater than the particle size distribution diagram of the inorganic particles. The ratio (A / B) of the area (A) on the small particle diameter side to the area (B) on the large particle diameter side, based on the maximum peak, is 1.05 or more, and the composite separator can simultaneously satisfy excellent mechanical stability, thermal stability, and ion conductivity characteristics.

This invention discloses a nitride epitaxial structure, its preparation method, and its applications. The nitride epitaxial structure includes a substrate with atomic steps, on which a nucleation layer with a striped pattern is grown; and on the striped patterned nucleation layer, a transition layer, a first semiconductor layer, and a second semiconductor layer epitaxial structure are grown. The nitride epitaxial structure of this invention achieves a high-crystal-quality GaN epitaxial layer within an ultrathin thickness range. This epitaxial layer possesses the characteristics of ultrathinness and high crystal quality, which can effectively improve the heat dissipation characteristics, voltage withstand characteristics, and trapping effects of device structures. Especially when applied to high-frequency, high-power devices, the improvement in heat dissipation, voltage withstand, and trapping effects helps to enhance the power characteristics and linearity of the device.