90results about How to "Increase charge and discharge rate" patented technology

This invention relates to a kind of improving method of lithium ionic cell cathode materials. The cathode materials in need of improving are mixed evenly with catalyst which has 0.1úÑ-10úÑ weight percent of cathode materials. The materials are then put into reaction furnace, which uses hydrocarbon as carbon source. The cathode materials are mixed with buffer gas according to 1í†(0-10) volume ratio. Then the mixture are reacted in reaction furnace at 600-1300íµ for 1-900 minutes. A kind of improved composite cathode materials, at the surface of which in-situ grows nanometer carbon fibrin/ carbon tube, are gained. The improved materials have good cell kinetic ability, circulating ability, charge-discharge capacity and consistency with electrolyte.

The invention relates to the technical field of a lithium ion secondary battery, in particular to a preparation method of high-rate fast-rapid graphite. The preparation method is characterized by comprising the following steps of (1) smashing and shaping a raw material; (2) mixing; (3) performing graphitization high-temperature processing, in which graphitization high-temperature processing is performed on the mixed material for 24-48 hours at 2,800-3,200 DEG C under protection of inert gas; (4) mixing the materials; (5) performing low-temperature thermal treatment; (6) performing carbonization thermal treatment; and (7) screening the mixed material. compared with the prior art, the preparation method has the advantages that the graphite is high in charge-discharge rate, large in discharge capacity and good in cycle performance, a button cell prepared from the graphite has excellent comprehensive performance and has main following advantages of relatively good large-current charge-discharge performance, good electrochemical performance, good cycle property, relatively high safety, relatively good adaptability to an electrolyte and other additives and stable product characteristic, the charge-discharge rate can reach over 10C, and the preparation method is suitable for industrial production.

The present invention relates to freestanding carbon nanotube paper comprising purified carbon nanotubes, where the purified carbon nanotubes form the freestanding carbon nanotube paper and carbon microparticles embedded in and/or present on a surface of the carbon nanotube paper. The invention also relates to a lithium ion battery, capacitor, supercapacitor, battery/capacitor, and fuel cell containing the freestanding carbon nanotube paper as an electrode. Also disclosed is a method of making a freestanding carbon nanotube paper. This method involves providing purified carbon nanotubes, contacting the purified carbon nanotubes with an organic solvent under conditions effective to form a dispersion comprising the purified carbon nanotubes. The dispersion is formed into a carbon nanotube paper and carbon microparticles are incorporated with the purified carbon nanotubes.

The invention discloses a nano sheet self-assembled MoS2 nano hollow material and preparation and application of the MoS2 nano hollow material serving as a lithium storage electrode material. The nano sheet self-assembled MoS2 nano hollow material is obtained by mixing raw materials including molybdenum oxide, sodium fluoride and potassium thiocyanate according to the mass ratio of 0.8-0.9:0.5-0.6:1.5-2.9; adding into water-ethanol mixed solvent; placing into a reaction kettle to be sealed; reacting at 140-220 DEG C for 12-30h; and performing washing, separating and drying to obtain products. The method is simple and easy in required condition, cheap and facile in raw materials and controllable in shape and height and easily achieves industrial production. Lithium storage electrodes prepared by adopting the prepared nano sheet self-assembled MoS2 nano hollow material not only have high electro-chemical lithium storage reversible capacity and excellent cycling performance, but also have good rate capability.

The invention discloses a method for realizing parallel connection of two sets of vehicle-mounted battery systems. A general positive relay and the like are included; the general positive relay, a battery management system, a first parallel relay, a parallel-connection protection relay and a second parallel relay are connected in parallel; the parallel-connection protection relay is connected with a pre-charging resistor in series; the battery management system is connected with a 24V power supply in series; and a first battery system and a second battery system are connected in parallel for supplying power for at least one electronic load. By adoption of the method, the problem existing in improvement of charging and discharging rate when the conditions of energy density, energy requirement and the like are not changed in the power supply system of the existing power automobile is solved; compared with the conventional design, the charging and discharging current can be effectively lowered; damage to a high-voltage device caused by heating due to a high current is effectively reduced, heating in the connecting place of battery modules is lowered, and the long-standing problem existing in module connecting design is relieved; the problem of ring current impact of parallel instantaneous high current in parallel connection use is solved; and the battery system is more reliable, and the service life of electrical devices can be prolonged.

The invention discloses a graphite composite negative electrode material, a preparation method thereof and a battery. Specifically, the invention provides a graphite composite negative electrode material which comprises a graphite inner core and a coating layer coating the outer side of the graphite inner core. The coating layer comprises a titanium and lithium doped porous hard carbon composite material. Therefore, through the coating layer comprising the titanium and lithium doped porous hard carbon composite material, the lithium ion extraction rate of a negative electrode prepared from the graphite composite negative electrode material in the charging and discharging process can be improved, the rate capability and the cycle performance of the negative electrode are good, and the quick charging performance, the safety performance and the like of a battery using the negative electrode are improved.

The invention discloses a preparation method for a flexible and bendable aluminum ion battery. The preparation method comprises the steps of extruding graphene oxide or a graphene oxide inorganic salt mixed solution to rotary inorganic salt solution coagulating bath in spinning equipment with certain diameter; then filtering and collecting short fibers from the coagulating bath by a filtering net, and lapping joint the short fibers into graphene oxide cloth; reducing the obtained graphene oxide cloth in a reduction temperature to obtain graphene cloth; and then assembling the obtained graphene cloth positive electrode material, a diaphragm, a negative electrode, an electrolyte and a battery shell to obtain the aluminum ion battery taking the graphene cloth as the positive electrode material. The flexible and bendable aluminum ion battery is green, environment-friendly and low in cost, and suitable for continuous and controllable large-scale industrial production; under the premise of ensuring relatively high energy density, power density and cycle life of the aluminum ion battery, the flexibility and bendable property of the battery are realized; and the flexible and bendable aluminum ion battery is applicable to the field of high-safety wearable energy storage devices.

The invention provides a lithium battery with total solid ions for conducting power, effectively solving the problems in the prior art that the energy density and the power density are low and the service life is short. The technical scheme is that the lithium battery comprises a positive electrode, a negative electrode and a housing, wherein the positive electrode and the negative electrode are arranged in the housing; a positive pole connected with the positive electrode and a negative pole connected with the negative electrode are respectively arranged on the housing; the positive electrode is a positive plate comprising of aluminum foil and nanocarbon/sulphate composite material coated thick in 2 to 10 microns on the aluminum coil; and an LiPON solid electrolyte film is arranged between the positive electrode and the negative electrode. The lithium battery has a simple structure, is easy to produce, has a good effect in use, high energy density, high power density, high charging and discharging rate and long service life, and is an innovation based on a power lithium battery and an energy storage battery.

The invention belongs to the field of lithium ion batteries, and particularly relates to a high-rate lithium ion battery graphite cathode material and a preparation method thereof. The preparation method comprises the following steps: (1) pulverization and shaping of raw materials; (2) graphitization; (3) demagnetization screening; (4) liquid phase coating granulation; (5) surface oxidation treatment. According to the high-rate lithium ion battery graphite cathode material and the preparation method thereof, a liquid phase coating granulation process replaces traditional secondary granulationthrough optimized fine graphite, so as to realize uniform coating of the surface of graphite, reduce the anisotropism of the graphite and shorten the diffusion path of lithium ions; then a micro porestructure is formed on the surface of the graphite through a surface oxidization pore formation process, so that a lithium ion migration channel of a cardinal plane is added to increase the migrationspeed of lithium ions. The charging rate of the graphite obtained by the method is more than 8 C, and the capacity can be maintained at 80 percent or above under the discharging rate more than 30 C.

The invention relates to the technical field of a lithium ion secondary battery, in particular to a preparation method of high-rate and rapid-charge graphite. The preparation method is characterized by comprising the following steps of (1) smashing and shaping; (2) mixing a modifying agent; (3) performing graphitization high-temperature processing; (4) mixing an adhesive; (5) performing low-temperature thermal treatment; (6) performing carbonization thermal treatment; and (7) screening a mixture. Compared with the prior art, the graphite has the advantages of high charge-discharge rate, large discharge capacity and good cycle performance; and the prepared button cell is excellent in integral performance and mainly has the following advantages that 1, the large-current charge-discharge performance is relatively good; 2, the electrochemical performance is good; 4, the cycle property is good; 5, the safety is relatively good; 6, the adaptability to an electrolyte and other additives is relatively good; and 7, the product property is stable, and the button cell is suitable for industrial production.

The invention provides a pole piece and a battery. The pole piece comprises a current collector and a functional layer located on the first surface of the current collector, wherein the first surface is provided with a tab, the functional layer is composed of a normal region away from the tab and a sunken region close to the tab, and the thickness of the sunken region is smaller than that of the normal region. The pole piece can effectively avoid the problem that the part, close to the tab, of a battery cell is too thick, and improve the safety, the charge-discharge rate and other qualities of the battery.

The invention discloses an oxide-graphite interlayer compound, a preparation method thereof, an electrode and a battery; the oxide-graphite interlayer compound is an interlayer compound formed by inserting silicon oxide, aluminum oxide or titanium oxide between natural graphite crystalline structure layer pieces. The silicon oxide, aluminum oxide or titanium oxide particles located at the graphitelattice interlayer position have very high electrochemical activity in the charging and discharging process, and the energy density of the electrode can be obviously improved. Through surface activation, a dispersing agent and a binding agent are added and uniformly mixed, the interlayer compound is pressed, formed and dried to obtain an oxide-graphite interlayer compound electrode. The oxide-graphite interlayer compound electrode is suitable for various types of batteries using carbon electrodes. The aluminum ion battery with the carbon electrode used as a cathode, the metal aluminum used asan anode, and aluminum ionic liquid as an electrolyte solution is superior to the lithium ion battery in the aspects of energy density, charging and discharging performance, safety performance and the like. The battery is widely applied to electric appliances such as mobile phones, cameras and the like and power batteries of various vehicles, ships, unmanned aerial vehicles and underwater submerged devices.

The invention relates to a lithium battery of an aqueous-oily active material electrode and a method for producing the lithium battery. The lithium battery comprises a cathode piece and an anode piece. The lithium battery is characterized in that: an A-surface coating to which a battery active material is adhered is coated on one surface of the cathode and anode pieces; the A-surface coating comprises the battery active material, an aqueous adhesive and an antioxidant; the aqueous adhesive comprises polytetrafluoroethylene or butylbenzene latex; the weight ratio of the aqueous adhesive to the antioxidant is 100:1.6 to 100:2.0; a B-surface coating to which the battery active material is adhered is coated on the other surface of the cathode and anode pieces; the A-surface coating comprises the battery active material and an oily adhesive; and the oily adhesive is polyvinylidene fluoride. The invention has the advantages that: on the premise of no reduction of the performance (such as the specific capacity and cyclicity of the battery) of the conventional universal technical products, the using safety of aqueous-oily active material battery products is greatly improved; the charge multiplying power and discharge multiplying power of the products are improved; the internal resistance of the battery and the manufacturing cost of the products are reduced; and the social benefit and economic benefit of lithium battery products are further improved.

The invention discloses a preparation method of a high-magnification quick-charging graphite negative electrode material. The method comprises the following steps: carrying out coarse crushing and fine grinding on one or more of needle coke, petroleum coke and pitch coke, carrying out spheroidizing shaping treatment, mixing with a first carbon source, heating to carry out surface coating, and carrying out high-temperature carbonization; then carrying out high-temperature graphitization treatment to obtain an artificial graphite powder; and mixing the obtained artificial graphite powder with asecond carbon source, heating for surface coating, and carbonizing at a high temperature to obtain the high-magnification quick-charging graphite negative electrode material. The graphite negative electrode material prepared by the invention has the advantages of a high charge-discharge rate, a large discharge gram capacity and good cycle performance, and a battery prepared from the graphite negative electrode material has excellent comprehensive performance.

This invention relates to a Li ionic battery positive material and its preparation method. Said material contains Li transition metal oxide, carbon nm-tube, black carbon and an adhesive mixed in the quality ratio of 80-90%, 3-10%, 0-8% and 3-10% and mixed to a slurry after dissolved by an organic solvent then to be coated on the Al foil to be rolled and dried in vacuum to get the electrode membrane, which gets the advantages of high capacity, high circulation stability and high charge/discharge multiplying factor.

The invention relates to the technical field of intermediate phase coal micro powder preparation, and particularly relates to a preparing method of high-capacity intermediate phase coal micro powder. The preparing method of the high-capacity intermediate phase coal micro powder is characterized by comprising the first step of smashing and pretreatment, the second step of mixing, the third step of hot isostatic pressure treatment, and the fourth step of catalytic graphitization and high-temperature treatment. An adhesive is one of petroleum asphalt and coal pitch; graphitization catalyst is one or more of carbides or oxides of one or more of silicon, iron, tin and boron. Compared with the prior art, the preparing method of the high-capacity intermediate phase coal micro powder is simple and practicable in preparing method and is applicable to industrial production; the prepared high-capacity intermediate phase coal micro powder has high charge-discharge rate and good cycle performance, and a button cell prepared from the coal micro powder has good overall performance.

The invention relates to a mixed ion-electron conductor with a garnet structure and application of the mixed ion-electron conductor in an energy storage device. The general formula of the conductor is(LimM)xLa3(Zr<1-a>Xa)2O12, wherein m is greater than 0 and less than or equal to 1, n is greater than or equal to 0 and less than or equal to 0.5, the sum of m and n is less than or equal to 1, and xis greater than or equal to 3 and less than or equal to 7.5; M comprises at least one element selected from H, Na, K, Rb, Mg, Ca, Sr, Ba, Y, La, Ti, Zr, Zn, B, Al, Ga, In, C, Si, Ge, P, S and Se; a is greater than or equal to 0 and less than 1; and X comprises at least one element selected from Ta, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Si, Ge, Sn, Pb, As, Sb and Se. The conductor provided bythe invention has high ionic conductivity and electronic conductivity, and can be applied to an electrode/electrolyte interface layer in a battery or a capacitor, a positive electrode layer and a negative electrode layer. The mixed ion-electron conductor can be applied to a lithium ion battery, a rechargeable metal lithium battery, a lithium flow battery and a lithium ion capacitor, and the energystorage devices have wide application.

The invention discloses a conductive agent for a lithium battery and a preparation method thereof. The conductive agent for the lithium battery comprises the following components in percentage by weight: conductor particles, a dispersing agent, a binder and solvent; the conductor particles are carbon particles with carbon nanometer tubes growing on the surfaces. According to the conductive agent provided by the invention, the plurality of carbon nanometer tubes of the conductor particles are firmly connected with a carbon particle, so that the reliable long-range electrical conductivity is provided; the carbon nanometer tubes of the different conductor particles are connected with one another, and contact the active material, so that a conductive network can be constructed for the lithiumbattery; the conductive agent provided by the invention is beneficial to reducing the dosage, lowering internal resistance and temperature rise, and improving charging-discharging multiplying power and cycling performance. According to the conductive agent provided by the invention, the carbon nanometer tubes and the carbon particles form conductive particles of a whole composite structure, so that the steps for preparing the conductive agent only needs one time of dispersing and mixing, and thus the production technology is simplified.

The invention discloses a preparation method of modified graphene and application of the modified graphene to positive materials for lithium batteries. The preparation method for the modified graphene comprises the following steps: preparing a graphene oxide slurry; reducing the graphene oxide slurry at high temperature to prepare graphene; modifying the graphene by a graphene oxidant; modifying the graphene by quaternary ammonium salt; doping the modified graphene into the positive materials for the lithium batteries. The modified graphene prepared by the method has the advantages that the modified graphene is free of agglomeration, excellent in dispersion in solvents, free of toxicity in preparation process, free of pollution to environment and long in service life; through the application of the modified graphene to the positive materials for the lithium batteries, the electric capacity and the charge-discharge rate of the batteries are improved obviously; a small amount of modified graphene is added, so that the cost is reduced.

The invention discloses a preparation method of a lithium ion battery positive pole material LiFePO4/C. The preparation method comprises the following steps of dissolving or dispersing a ferric salt, a lithium salt and a phosphorus-containing compound in a solvent under the condition of inert gas purging to obtain a reaction precursor, transferring the reaction precursor into a high pressure reactor, carrying out a reaction process for a certain time, carrying out filtration, washing and drying, carrying out mixing with a carbon source, and carrying out calcination treatment to obtain the lithium ion battery positive pole material LiFePO4/C. The preparation method solves the problem that the traditional preparation method cannot simultaneously realize high crystallization, special morphology and nano-scale particle size. The preparation method can prepare the completely-crystalline flaky nano-scale lithium ion battery positive pole material LiFePO4/C.

The invention provides a 3D foil material, a preparation method and an application of a positive plate and a negative plate containing the same. The 3D foil material comprises a base material, wherein multiple first through holes are formed in the middle of the base material; lug bosses are arranged on the peripheries of the first through holes in the base material; the lug bosses and the base material are formed integrally; second through holes are formed in the lug bosses; the side walls of the second through holes are parallel to the side walls of the lug bosses; the second through holes are communicated with the first through holes; the pore diameter, far from the second through hole end, of the first through holes is greater than or equal to that in the connecting place between the first through holes and the second through holes; and the pore diameter in the connecting place between the first through holes and the second through holes is greater than that, far from the first through hole end, of the second through holes. The 3D foil material provided by the invention adopts a mechanical stamping and punching way, so that the foil material is endowed with the three-dimensional structure including the first through holes, the second through holes and the lug bosses; and therefore, the adhesive force between the foil material and slurry can be greatly increased, and dosage of adhesive and an additive in the slurry can be further lowered.