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

The invention relates to a compound material of millimicron metal or alloy / electrode active substance, comprising: millimicron metal or alloy and electrode active substance; millimicron metal or particle of alloy takes up 0.02~30 wt% of electrode active substance. The compound material is negative electrode active material of secondary lithium battery, cooperating with of metal oxide containing lithium, organic electrolyte solution, diaphragm, battery shell, and afflux agent and lead, to form secondary lithium battery. The electrode active substance of compound material supplies rigid skeleton structure and center for inlaying lithium, helps the formation of solid electrolyte layer on the surface of electrode active substance which has excellent ion conducting power; can avoid destruction to lamellar structure of graphite, stop unit of millimicron material effectively and increase periodicity and capacity of discharge and discharge with large current. The a secondary lithium battery has excellent abilities of circulation and safety, suitable for the place needing fairly high energy density.

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 discloses a lithium ion capacitor cathode piece, and cathode piece is formed by mixing active material, conductive agent and binder into sizing agent and then coating the sizing agent on a current collector. the active material is spherical polyimide charcoal, and the current collector has pore structures which allow the lithium ions to pass through freely, and the aperture ration is 20% - 60%, and the thickness is 10-30Mum. The cathode piece has the advantages of good spherical degree, small particle size, high specific surface area, good conductivity and low cost. In addition, the cathode piece can effectively improve the speed of the lithium ion of the lithium ion capacitor that embeds / remove out of negative electrode materials, so as to improve the large current discharge capacity of the lithium ion capacitor. The invention also discloses a lithium ion capacitor using the cathode pieces. The lithium ion capacitor includes an anode, a cathode, a diaphragm, electrolyte and lithium auxiliary electrodes.

The invention discloses a silicon-carbon negative electrode and a preparation method thereof. The silicon-carbon negative electrode comprises a current collector, an active material layer coated on the current collector, and a functional coating coated on the active material layer; the functional coating includes a poly Pyrrole and single-wall carbon nanotubes, polypyrrole and single-wall carbon nanotubes form a three-dimensional mesh conductive network. The present invention also provides a method for preparing a silicon carbon negative electrode, comprising: (1) coating an active material layer slurry on a current collector; (2) coating a functional coating slurry on an active material layer of a current collector to obtain a silicon carbon negative electrode. The carbon negative electrode; the functional coating slurry is prepared by the following method: the pyrrole monomer is dispersed in a solution containing single-walled carbon nanotubes to prepare the functional coating slurry; during the reaction, the pyrrole monomer is polymerized to form polypyrrole, Polypyrrole and single-walled carbon nanotubes form a three-dimensional mesh-like conductive network. The silicon-carbon negative electrode of the invention suppresses the volume expansion of the silicon-carbon negative electrode of the silicon-based lithium ion battery, and improves the conductivity of the silicon-carbon negative electrode.

The invention discloses a preparation method of porous nanoscale TiNb2O7. The preparation method of the porous nanoscale TiNb2O7 comprises the following specific steps: (a) adding a titanium source and a niobium source in the molar ratio of 1 to 2 into a dispersant, dispersing and mixing; and (b) pouring the mixture obtained in the step (a) into a porcelain boat, roasting at the temperature of 700-900 DEG C, preserving heat for 3-6 hours, and cooling the product of reaction to room temperature to obtain the porous nanoscale TiNb2O7, wherein the temperature is increased at a speed of 1-5 DEG C per minute. The preparation method of the porous nanoscale TiNb2O7 is easy to operate, and the obtained porous nanoscale TiNb2O7 has small particle size, uniform particle size distribution and good stability and consistency. Due to the abundant pore passages of the porous nanoscale TiNb2O7, an active material can be fully soaked by an electrolyte, and due to the nanoscale particles of the porous nanoscale TiNb2O7, the transmission distance between lithium ions and electrons in the charging and discharging process can be shortened effectively, and the high-current charging and discharging capability of the TiNb2O7 can be improved. The porous nanoscale TiNb2O7 has excellent electrochemical properties and broad application prospects.

The invention discloses a preparation method of a carbon-coated ternary cathode material, belonging to the technical field of lithium ion batteries. 11) adding the ternary cathode material and the silicon dioxide precursor into an organic solvent, uniformly mixing, dripping deionized water, stirring for reaction, evaporating all solvent, and calcining to obtain the silicon dioxide-coated ternary cathode material; (2) adding silica coated ternary cathode material and organic carbon source into dispersant to obtain suspension, evaporating and sintering to obtain silica coated ternary cathode material and carbon coated ternary cathode material; (3) immersing the ternary cathode material coated with silicon dioxide and carbon in alkaline solution to obtain the ternary cathode material coated with carbon. A silicon dioxide layer is used as an intermediate protective layer to prevent a carbon source from releasing a reducing gas to reduce a main material in a high-temperature carbonization process, so that a carbon coating formed by the silicon dioxide layer can give full play to its conductivity, thus improving the charging and discharging capacity of a battery at a large current, and further improving the rate performance.

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 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 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 belongs to the field of battery materials, and relates to a preparation method of an organic sulfur cathode material for a lithium-sulfur battery. In the present invention, sublimated sulfur is mixed with iodide, and under high temperature conditions in a specific atmosphere, the sublimated sulfur undergoes ring-opening polymerization to form linear sulfur to obtain a linear sulfur mixed liquid containing iodide; then, organic materials are added to the mixed liquid containing iodide The linear sulfur is grafted onto the carbon chain of the organic material; finally quenched and solidified to obtain an organic sulfur cathode material containing iodide. The obtained organosulfur cathode material has good electrical conductivity and good rate performance.

The invention provides a Pb / C supercapacitor battery cathode preparation method, and aims to provide a supercapacitor battery cathode preparation method which is high in active material utilization rate, good in power characteristic, small in leakage current, long in cycle life and excellent in pole piece electric energy storage and release performance. The method is implemented through the following technical scheme which comprises the steps of firstly adding 5%-15% of modified functionalized activated carbon material slurry with high specific surface area into a stirring tank, and stirring for 10-15min; then adding 50wt%-65wt% of cathode active material lead powder with the oxidation degree being 75%, 1wt%-5wt% of conductive agent and 1wt%-3wt% of addition agent into the stirring tank, and stirring for 5-10min; then adding 10wt% of deionized water, and stirring for 25-30min; and finally adding 10wt% of H2SO4 with the concentration being 6mol / L, and stirring for 20min so as to prepare energy storage type or a power type supercapacitor battery cathode material paste. The modified functionalized activated carbon material slurry with the high specific surface area is cleaned by HNO3, H3PO4 and a urea solution with the temperature being 90-100DEG C and loaded with part of metal compounds.

The invention discloses a silicon-carbon negative electrode, a preparation method thereof, a lithium ion battery and an electric vehicle, which relate to the technical field of the silicon-carbon negative electrode of the lithium ion battery. The silicon-carbon negative electrode comprises a negative electrode current collector, a coating and a silicon-carbon negative electrode material layer sequentially arranged on the surface of the negative electrode current collector; Coatings include: mesophase pitch, graphene and coating binder, mesophase pitch, graphene and binder mass ratio of 20-50:40-65: 1.5-10. The silicon-carbon negative electrode current collector of the present invention is coated with a mesophase pitch, The coating of graphene and binder can improve the conductivity and heat dissipation of silicon-carbon negative electrode, improve the cycle performance, safety and high current charging and discharging ability of lithium ion battery. The binder is PVDF of water system,and the adhesive between coating and negative electrode material PVDF of water system is synergistic to enhance the adhesion between coating and negative electrode material and further improve the cycle performance.

The invention relates to a sodium ion capacitor with a negative pole made of a FeS2-xSex material. The sodium ion capacitor comprises a positive pole sheet, a negative pole sheet, a diaphragm, an electrolyte and a shell; an active material, a conductive agent and a binder are mixed, a solvent is added into an obtained mixture, the solvent and the mixture are mixed to form a slurry, the slurry coats a collector, and therefore, the negative pole sheet can be obtained; and the active material in the negative pole sheet of the capacitor is the FeS2-xSex material, wherein x ranges from 0.1 to 1. The negative pole of the sodium ion capacitor of the invention is made of the FeS2-xSex material; the peak position of the XRD diffraction pattern of the FeS2-xSex material slightly shifts leftwards compared with that of FeS2, which indicates that an inter-layer spacing is increased, and therefore, the implanting and extraction of sodium ions can be better facilitated; the diffusion of Na<+> is faster, electronic conductivity is higher, and therefore, the high-current charge and discharge capacity of the sodium ion capacitor can be greatly improved, namely, the power performance of the sodium ion capacitor is improved; if the power density of the sodium ion capacitor is 172 W kg<-1>, the energy density of the sodium ion capacitor is as high as 67 Wh kg<-1>; and even if the power density of the sodium ion capacitor is as high as 2543 W kg<-1>, the energy density of the sodium ion capacitor is still maintained at about 27Wh kg<-1>.