14results about How to "Improve Capacitive Performance" patented technology

This invention provides a method for screening the stability of biomass shell-derived hard carbon raw materials. The method investigates the optimal ratio and relationship between the lignin content and sugar content measured after alkali treatment in biomass shell materials, thereby screening the stability of biomass shell materials from different sources and batches. When the lignin content of the biomass shell material itself and the sugar content measured after alkali treatment satisfy the relationship 15≤β×L≤60, an effective balance between the lignin and sugar content in the biomass shell material can be achieved, resulting in a good porous structure. This method provides a simple and rapid screening process to obtain biomass shell materials with better stability. When biomass shell materials with better stability are subsequently used to prepare hard carbon battery materials, the resulting hard carbon battery materials exhibit good overall performance in terms of cycle life, capacity, and coulombic efficiency.

This invention discloses a method for reusing negative electrode graphite from waste lithium batteries, comprising the following steps: stripping graphite from the current collector to obtain waste graphite; mixing and grinding the waste graphite, sublimed sulfur, and red phosphorus to obtain a mixed powder; placing the mixed powder in an inert gas atmosphere and rapidly burning it in a rapid-burning device for a period of time, followed by cooling, to obtain recycled graphite. The invention also discloses the preparation and application of this recycled graphite. This invention is applicable to the field of lithium battery recycling technology. Rapid burning effectively removes impurity elements from the negative electrode graphite in waste lithium batteries, helping to reduce the negative impact of these impurities on the performance of the negative electrode graphite; subsequently, through the grinding reaction with sublimed sulfur and red phosphorus, C-S-P bonds are formed, improving the conductivity and rate performance of the graphite, thereby enhancing the capacity and cycle performance of the obtained recycled graphite.

The present application relates to lithium ion battery cathode material preparation technical field, and is a kind of preparation method of nitrogen-phosphorus-potassium co-doped carbon-coated lithium-rich lithium iron phosphate cathode material, comprising the following steps: cocoa powder is added dropwise with acetic acid solution, after reaction, dropwise add hydrogen peroxide, add lithium hydroxide, and the pH of mixed solution is controlled by the amount of deionized water added;After adding deionized water and carbon-coated lithium iron phosphate precursor, stir evenly, vacuum freeze-drying is carried out, and the product is obtained after sintering treatment of dry product in inert atmosphere.Cocoa powder resource is renewable, environment-friendly, and can provide rich nitrogen, phosphorus and potassium elements to complete the doping modification of carbon-coated lithium iron phosphate.The present application provides an environmentally friendly, clean and simple cathode material modification and synthesis idea, and the prepared cathode material has good rate performance and capacity performance.

The invention relates to the technical field of secondary batteries, in particular to a sodium ion battery positive electrode active material and a preparation method thereof, a positive electrode plate and a secondary battery, the sodium ion battery positive electrode active material comprises a polyanion material, the chemical formula of the polyanion material is Na < 3-x > A < x > V < 2-y > B < y > (PO4) 2F3, 0lt, x is less than or equal to 0.3, 0lt; y is less than or equal to 0.2, the doping element A is one or more of Li and K, and the doping element B is one or more of Y, Cr, Fe and Mg. The sodium-ion battery positive electrode active material obtained by co-doping the vanadium sodium fluorophosphate with the doping elements A and B has obviously improved capacity performance, cycling stability and rate capability.

The invention belongs to the technical field of quinoline insoluble extraction and utilization and carbon material preparation, and particularly relates to a quinoline insoluble extraction method, spherical capacitance carbon and a preparation method thereof. The extraction method of the quinoline insolubles comprises the following steps: mixing coal liquefaction residues, quinoline, an extraction agent and a dispersing agent to form a mixed solution containing the quinoline insolubles; and adding an auxiliary agent into the mixed solution, mixing, standing and filtering to obtain the quinoline insoluble substance and an asphalt solution. The extraction method of the quinoline insoluble substances has the beneficial effects that the quinoline insoluble substances are extracted from the coal liquefaction residues through mixed solvent extraction-sedimentation, the high-purity asphalt product is obtained, the purity of the asphalt product and the quinoline insoluble substances can be remarkably improved, the ash content in related products is effectively reduced, and the production cost is reduced. The preparation requirement of the carbon material is met; the spherical capacitor carbon has the advantages of high specific surface area, high mechanical strength, low porosity, high volume energy density and high capacitance performance.

The invention relates to the technical field of batteries, and discloses a lithium-position nickel-doped positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) carrying out first mixing on a first lithium source, a first nickel source and a solvent to obtain a mixed metal solution; (2) carrying out spray drying on the mixed metal solution, and calcining to obtain lithium-nickel composite oxide microspheres; and (3) carrying out second mixing on the lithium-nickel composite oxide microspheres, a positive electrode precursor material and a second lithium source, and then sequentially pre-sintering and sintering to obtain the lithium-position nickel-doped positive electrode material. The lithium-position nickel-doped positive electrode material with excellent performance is prepared through mutual cooperation of designed specific preparation processes, so that the obtained positive electrode material can simultaneously exert excellent capacity performance and crystal structure stability in the running process of the lithium ion battery.

The invention discloses a graphite material and a preparation method thereof, an electrochemical device and electronic equipment. The graphite material meets the following conditions: La is less than or equal to 72 nm, and Lc is less than or equal to 15 nm; wherein La is a lattice constant of a graphite crystal in the graphite material on a 110 plane, and Lc is a lattice constant of the graphite crystal in the graphite material on a 002 plane; f is greater than or equal to 15 mN, and F is particle crushing force. An electrochemical device (especially a lithium ion battery) containing the composite material can ensure excellent first effect and fast charge performance, and also has excellent self-discharge performance, capacity performance and cycle performance.

This invention belongs to the field of structured light field generation and optical communication coding technology, and discloses a method and system for optical information expansion based on custom mask coding. The method involves: generating a coherent superimposed beam of conjugate modes based on the target light field; spatially filtering the coherent superimposed beam of conjugate modes to obtain a conjugate LG Gaussian beam with missing states; obtaining a high-dimensional information carrier phase distribution map based on the amplitude and phase information of the conjugate LG Gaussian beam with missing states; and expanding the target light field based on the high-dimensional information carrier phase distribution map. This invention solves the bottleneck of traditional algorithms easily getting trapped in local optima, significantly improves the quality of light field generation under complex diffraction screen conditions, and achieves high-efficiency, high-uniformity multi-vortex beam superposition control.

The application discloses a semiconductor process equipment, including a semiconductor chamber, an electromagnetic coil, a support component and an insulating capacitance adjusting piece, wherein: the semiconductor chamber has an inner cavity, the support component is arranged in the inner cavity, and the support component is used for supporting a wafer; the semiconductor chamber comprises a dielectric window, and the dielectric window is arranged opposite to the support component; the electromagnetic coil is arranged outside the semiconductor chamber and opposite to the dielectric window, and a containing space is formed between the electromagnetic coil and the dielectric window; and the insulating capacitance adjusting piece is movably arranged in the containing space and used for covering part of the dielectric window. The above scheme can solve the problem that part of the wafer cannot meet the processing requirements when the semiconductor process equipment processes the wafer.

This invention provides a negative electrode structure, its fabrication method, and a battery. The negative electrode structure includes two composite current collector layers and an electroplated mesh layer sandwiched between the two composite current collector layers. The surface of the composite current collector layers is covered with through holes. Each composite current collector layer includes a current collector and an anti-electroplating layer disposed on one side of the current collector. All anti-electroplating layers in the composite current collector layer are disposed on the side of the current collector away from the electroplated mesh layer. At least one anti-electroplating mesh layer is disposed between the current collector and the electroplated mesh layer. This invention simplifies the electrode fabrication process and improves the electrode capacity by adding an anti-electroplating mesh layer between the electroplated mesh layer and the current collector.

This invention proposes a long-life, high-capacity magnesium seawater activated battery cathode assembly and its preparation method. This invention relates to the field of seawater battery technology and includes the following steps: S1, mixing lead chloride, a composite carbon source, and pure water, and then centrifugally spray-drying to obtain a precursor; S2, sintering and air-jet crushing the precursor in an inert gas atmosphere to obtain a first cathode material; S3, mixing the first cathode material, a binder, a co-solvent, and pure water, and then drying to obtain a second cathode material; S4, rolling, drying, and cutting the second cathode material into cathode sheets, wrapping the cathode sheets with a current collector, and pressing them into a cathode assembly. The preparation method provided by this invention allows lead chloride to fully contact the conductive carbon layer, improving the conductivity of the material, thereby improving the capacity performance and working life of the magnesium seawater activated battery, ensuring long-term stable operation of marine equipment.

The application relates to the technical field of energy storage materials, and discloses a preparation method of a quasi-parallel arrangement structure MXene-rGO material loaded with RuO2 quantum dots and application of the quasi-parallel arrangement structure MXene-rGO material loaded with RuO2 quantum dots in a practical horizontal loading electrode. GO and MXene colloid are mixed, heated and gelled, and then immersed in a RuCl3 solution; the pH value is adjusted to 7 by using a NaOH solution to form a MXene-rGO hydrogel loaded with Ru(OH)3; after washing, drying and annealing, a MXene-rGO-RuO2 composite material is obtained. In the preparation process, the loading of Ru(OH)3 causes the mechanical flexibility of the two-dimensional nanosheet layer to decrease, and hydrogen bonds are formed with the end groups, so that the two-dimensional nanosheet layer is in a quasi-parallel arrangement structure, and the ion diffusion limitation in the practical horizontal loading electrode is reduced. The hydrogel structure and proper Ru 3+ immersion liquid ensure that Ru 3+ quantum dots are uniformly distributed, and the electrochemical active sites are fully exposed.

The invention belongs to the technical field of batteries, and particularly relates to a vanadium pentoxide composite material and a preparation method and application thereof. The preparation method comprises the following steps: mixing ammonium metavanadate, a coating agent and a solvent, carrying out hydrothermal reaction to obtain a precursor, and sintering the precursor to obtain the vanadium pentoxide composite material, wherein the conditions of the hydrothermal reaction are as follows: the temperature is 170-185 DEG C, and the time is 2-5 hours; the vanadium pentoxide composite material prepared from ammonium metavanadate under a specific hydrothermal condition has a large specific surface area and a short ion diffusion path, a coating agent is added to realize coating, a high-efficiency electron conduction network is formed, and the vanadium pentoxide composite material has excellent capacity performance and cycling stability due to the synergistic effect of the coating agent and the high-efficiency electron conduction network.