31results about How to "Improve high current charge and discharge capability" patented technology

The invention relates to a high-magnification supercapacitor composite electrode material and a preparation method thereof. The composite electrode material is obtained by H-bond action between an oxygen-containing group of a graphene oxide and an oxygen-containing group of a carbohydrate, graphene is wrapped on the surface of activated carbon particles at the microscopic scale, and the high-magnification supercapacitor composite electrode material is of a spongy porous structure on the whole. The material disclosed by the invention is prepared by high-temperature activation, so that the structure is stable; and as the electrode material of a supercapacitor, the activated carbon/graphene composite material prepared by adopting the method disclosed by the invention shows more excellent magnification performance in comparison with the traditional activated carbon.

The invention belongs to the technical field of a new energy material, specifically a preparation method of a vanadium tetrasulfide/graphene composite material used for an electrode of a sodium ion battery. By adopting a hydrothermal synthesis method and by adopting layered graphene as a template, vanadium tetrasulfide is grown on the layered graphene template (or vanadium tetrasulfide particles are coated with graphene) so as to form the vanadium tetrasulfide/graphene composite material; the method is simple in process, low in cost, high in repeatability, and suitable for a commercial application of the electrode material of the sodium ion battery; according to the preparation method, by virtue of a graphene thin film sheet layers, the nanometer vanadium tetrasulfide particles are connected between the sheet layers to form a stable solid electrolyte interface film, thereby effectively improving conductivity of the composite electrode material, and showing high rate capability and cycle stability; and the reversible specific capacity in charging and discharging cycles at the current of 0.2A.g<-1> can reach 580mAh.g<-1>, and high-current charging and discharging capability of as high as 20A.g<-1> can be realized, so that the commercial electrode application of the sodium ion battery can be satisfied.

The producing method applies the normal temperature reactive solution SnCl2 as the solution, the ammonia as the precipitator, and the cabamide as the compound to supply the O-H, and the KBH4, NaH2PO2 as reducer. The catalyst and some compound complexing agent are also added. During the reaction procedure, the concentration of the reducer is to be controlled to keep definite ratio Sn, to reduce the irreversible capacity in the electrochemical lithium storage procedure. The material produced effectively remites the volume changing of the electrode resulted in the discharging process.

The invention discloses a high-rate and safe cylindrical lithium ion battery. The battery comprises a positive pole piece and a negative pole piece, wherein a ceramic diaphragm is arranged between thepositive pole piece and the negative pole piece, a positive coating is arranged on a surface of the positive pole piece, a negative coating is arranged on a surface of the negative pole piece, an aluminum foil is arranged on the positive pole piece, a copper foil is arranged on the negative pole piece, high-temperature insulating adhesive tapes are arranged on the outer side surfaces of the positive coating and the negative coating, and polymer adhesives are arranged on surfaces of high-temperature insulating adhesive tapes. The battery is advantaged in that gathered multiple tabs are weldedwith a planar metal sheet current collector to form a full tab, so internal resistance is greatly reduced, and the high-current charging and discharging capacity of the battery is improved. The dry battery cell is subjected to electrolyte injection, packaging, formation and capacity grading, so the high-rate and safe lithium ion battery is assembled, the manufacturing process is simple and convenient, and the lithium ion battery is particularly suitable for new energy application fields of electric vehicles, large-scale energy storage and the like.

The invention discloses a hybrid current collector used for lead storage batteries, which is characterized in that the hybrid current collector comprises at least one conducting framework and a shaping framework, the conducting framework is molded in a hybrid form, the shaping framework is manufactured by lightweight hard materials, and the hybrid current collector is a grid plate with hollow grids or a plate-shaped current collector without grids. The hybrid process of the conducting framework and the shaping framework includes injection molding and joggle fixing molding, wherein the injection molding utilizes thermal plastic and cold extrusion or uses cement concrete, the joggle fixing comprises steps of utilizing the lightweight hard material to manufacture a substrate module which is used as the shaping framework and then joggling and fixing the shaping framework with the conducting framework which is designed as a coupling module. The conducting framework of the current collector can extend to form an integrated lead electrode or is electrically fixedly connected with a split lead electrode. The polar plate manufactured by utilizing the current collector is light in weight, high in specific energy, simple in manufacture and low in material cost.

The invention relates to the technical field of batteries, in particular to an opposite bipolar plate and an opposite bipolar battery. The opposite bipolar plate is mainly characterized in that one end of a conductive substrate is provided with an anode plate, and the other end thereof is provided with a cathode plate. The opposite bipolar battery is mainly characterized in that the two ends thereof are respectively provided with a unipolar anode plate group and a unipolar cathode plate group; the opposite bipolar plate groups with the bipolarity are stacked in sequence between the unipolar anode plate group and the unipolar cathode plate group; the adjacent single batteries are internally connected in series as the opposite bipolar plate penetrates the separator; no single battery requires external connecting component; the structure is simple; the current density, working conditions and environmental conditions of heat and moisture for the polar plates are uniform; the internal resistance and the connection requirements are greatly reduced; the weight is greatly reduced; the reliability and security are substantially improved; the service life is long; and the cost is greatly reduced. The invention can greatly improve the power density and energy density of the battery, and simultaneously improves the high-current battery charge and discharge capacity, the charge-discharge efficiency, the adaptability to the thermal environment, the anti-vibration capability and the like.

The invention provides a method for improving the surface conductivity of nickelous hydroxide. The method includes the steps of adding powdery nickelous hydroxide to a water solution of dissoluble cobalt salt for cation exchange between nickel ions on the surface of the powdery nickelous hydroxide and cobalt ions in a water solution phase to form a replacement layer, and forming a CoOOH wrapping layer with conductivity on the surface of nickelous hydroxide through anodic polarization and oxidization, thereby improving the surface conductivity of nickelous hydroxide. The nickelous hydroxide electrode material prepared through the method for wrapping CoOOH has the advantages of being high in conductivity, high in charging and discharging reaction reversibility, good in large-current chargingand discharging performance and good in circulation performance.

The invention relates to a manufacturing method of an anode conducting strip and a cathode conducting strip of a battery or a capacitor, which comprises three steps of spot welding, roll welding and pasting an adhesive tape. The anode conducting strip and the cathode conducting strip can be positioned by spot welding, then connected by roll welding and fixing, and performed an insulation treatment by the adhesive tape. Compared with the spot welding process, the welding process of first spot welding then roll welding is capable of increasing the contact area of the conducting strip and a pole plate, tightly connecting the pole plate and the conducting strip, reducing the internal resistance, raising the conductivity, raising the effect of high power charge and discharge of the pole plate and enhancing the capability of ultra-high multiplying power rapid charge and discharge of the products.

The invention discloses a preparation method of a double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains. The material is regulated and controlled and designed from the dual perspectives of crystal grain arrangement and secondary particle morphology, the double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains is prepared, and the material shows good comprehensive performance, especially excellent rate capability and cycling stability. The material is simple in preparation process, low in production cost, environmentally friendly, expected to realize industrial mass production and wide in application prospect.

The invention belongs to the field of lithium ion battery material preparation and particularly relates to a lithium ion battery doped modified lithium manganese phosphate cathode material and a preparation method thereof. The lithium ion battery cathode material is carbon-coated doped modified lithium manganese phosphate, the doped modified lithium manganese phosphate is composed of lithium source compound, manganese source compound, phosphate source compound and arsenate source compound in a molar ratio of Li:Mn:PO43-:AsO43-=1:1:(1-x):x, and the x is greater than 0 and is not greater than 0.15. Through partially replacing backbone phosphate radicals in the lithium manganese phosphate crystal with arsenates, electronegativity of arsenic is weaker than that of phosphorus, partial doping ofarsenates changes the energy state structure of the lithium manganese phosphate crystal, electronic conductivity and ionic conductivity of the lithium manganese phosphate crystal are improved, large-current charging and discharging capacity and cycle performance of the lithium manganese phosphate cathode material are greatly improved, and the preparation process is simple in operation, easy to control and is advantageous for realizing large-scale industrial production.

The invention discloses a lead-acid storage battery current collector. The lead-acid storage battery current collector comprises a lead sheath, a light conductor and an edge sealing material; the leadsheath and the edge sealing material are combined together; the light conductor is wrapped and enclosed in an enclosed space to enable the light conductor and an external environment space of the current collector not to be communicated with each other so as to be isolated from each other; and the light conductor is conductively connected with the lead sheath. The invention further discloses a manufacturing method and tool of the current collector and a lead-acid storage battery comprising the current collector. The manufacturing method and tool of the current collector are beneficial to manufacturing the current collector. According to the current collector, the weight of the current collector of the lead-acid storage battery, and the usage amount and cost of lead materials can be greatly reduced, and the conductivity of the current collector can be improved. The lead-acid storage battery comprising the current collector has remarkably improved performance in multiple aspects, such as specific energy, capacity, high-current charging and discharging capacity, internal resistance, polarity inversion performance, environmental protection, cost, service life and the like.

The invention discloses lead powder with a lead oxide graphene core-shell structure and a preparation method thereof, relates to the technical field of lead-carbon batteries, and is used for solving the problems that in the prior art, the charge retention capacity is reduced, the manufacturing difficulty and cost are increased, and the sulfation weakening effect of a carbon material is reduced. The lead powder comprises lead oxide particles, an activated carbon layer wrapping the lead oxide particles and graphene dispersed in the activated carbon layer, the activated carbon layer is of a porous structure, and the graphene is dispersed in holes of the porous structure. The preparation method comprises the following steps: mixing a lead acetate solution, saccharides and graphene; mixing the alkaline solution with a mixed solution of lead acetate, saccharides and graphene; mixing a surfactant, an emulsifier and the mixed solution containing the lead hydroxide particles to obtain a suspension; and enabling the suspension liquid to be sequentially subjected to spray drying and sintering, and obtaining the lead powder of the lead oxide graphene core-shell structure. The lead powder and the preparation method can be used for the lead-carbon battery.