55results about How to "High rate charge and discharge performance is good" patented technology

The invention discloses a preparation method of a graphene/lithium titanate composite anode material, which comprises the following steps: compounding compounds serving as a lithium source and a titanium source and graphene oxide through a liquid-phase method and reducing graphene oxide of the compound in inert gas mixed with reducing gas into graphene so as to obtain the graphene/lithium titanate composite anode material. The method has the characteristic of realizing uniform distribution of graphene in lithium titanate through an in-situ compounding technique. Under the same conditions, the discharge time of a hybrid capacitor which respectively takes the graphene/lithium titanate composite anode material and activated carbon as the anode and cathode is obviously greater than that of an electric double-layer capacitor which takes activated carbon as an electrode and that of a hybrid capacitor which respectively takes lithium titanate and activated carbon as the anode and cathode. The lithium titanate phase purity of a hybrid supercapacitor and lithium ion battery composite anode materials prepared by the method disclosed by the invention is higher. Furthermore, the preparation method further has the characteristic of easily realizing the large-scale industrial production.

The invention provides a hydrothermal preparation method of a graphene-coated sulfur/porous carbon composite material and relates to a preparation method of the graphene-coated sulfur/porous carbon composite material for a positive electrode material of a lithium-sulfur storage battery. The hydrothermal preparation method is used for solving the technical problem that the electrochemical property of the positive electrode material of an existing lithium-sulfur battery, namely a graphene-coated sulfur-containing composite material, is low. The hydrothermal preparation method comprises the steps of mixing and scattering the sulfur/porous carbon composite material with graphene slurry or oxidized graphene slurry, carrying out hydrothermal synthesis to prepare a hydrogel column, and drying to obtain the graphene-coated sulfur/porous carbon composite material. According to the graphene-coated sulfur/porous carbon composite material prepared by utilizing the hydrothermal preparation method, the outer surfaces of the graphene sheet layers are coated with sulfur/porous carbon composite material particles, a graphene conduction network is generated among the particles, and the obtained graphene-coated sulfur/porous carbon composite material is in a hierarchical core-shell structure; the positive electrode material has the high specific capacity, the long cycle life and the good rate capability; the composite positive electrode material can be used as a positive electrode material in a lithium secondary battery.

The invention relates to the technical field of lithium ion battery carbon cathode materials and in particular to a modified microcrystal graphite cathode material of a lithium ion battery as well asa preparation method and application thereof. The material has the advantages that (1) a modified core-shell structured natural graphite cathode material with artificial graphite embedded into and onthe surface of natural graphite in situ is prepared, the overall structural properties of natural microcrystal graphite are maintained, pores of the natural microcrystal graphite is filled with the artificial graphite, and the outer surface of the natural microcrystal graphite is wrapped by the artificial graphite; (2) compared with a conventional cathode material, the cathode material prepared byusing the method provided by the invention is good in isotropy, is capable of inhibiting and absorbing expansion of electrodes in the charge and discharge process, is high in primary coulombic efficiency, long in service life and good in high-magnification charge and discharge performance and is capable of replacing artificial graphite to manufacture cathode materials of power batteries, so as tolower the cost greatly; and (3) the method is simple in preparation process, low in cost and relatively high in practicability.

The invention discloses an active material of a lead storage battery plate. An anode active material comprises the following components by weight: 100kg of lead powder, 0.01 to 2kg of conductive fiber, 0.1 to 5kg of metallic oxide, 0.1 to 2kg of conductive carbon material, 0.01 to 1kg of sodium carboxymethyl cellulose and 1 to 15kg of diluted sulfuric acid; and a cathode active material comprises the following components by weight: 100kg of lead powder, 0.01 to 2kg of conductive fiber, 0.1 to 5kg of conductive carbon material, 0.1 to 0.6kg of barium sulfate, 0.2 to 1kg of humic acid, 0.01 to 0.1kg of lignin and 1 to 15kg of diluted sulfuric acid. The components and ratio of the active material are improved and optimized, and the active material comprises various carbon materials, so a super lead storage battery consisting of the plate made of the active material has high low-temperature performance, high rate charge and discharge performance and long charge and discharge cycle life, and particularly has strong market competition advantages when applied to electrically-driven vehicles.

The invention discloses a manufacturing method of a negative plate of a safety lithium-ion battery. The method comprises the steps of mixing a negative active material with a conductive agent at a certain mass ratio to obtain a mixture A; carrying out ball-milling and mixing on an additive B and the mixture A at a certain mass ratio to form a mixture C; preparing a certain mass percent of water solution from CMC which accounts for a certain mass ratio of the mixture C, carrying out constant-temperature stirring, adding an SBR which accounts for a certain mass ratio of the mixture C in batches, simultaneously adding an NMP which accounts for a certain ratio of the mixture C and carrying out constant-temperature stirring to form a sizing material D; adding the mixture C to the sizing material D in batches, controlling the solid content of the mixture C and stirring to obtain slurry; adding a proper amount of water, adjusting, controlling the viscosity and stirring to obtain negative slurry E; employing copper foil as a current collector F, intermittently coating a single side or double sides of the current collector F with the negative slurry E, reserving a certain current collector, carrying out drying, controlling the surface density, carrying out rolling and controlling the compactness and the thickness of the negative plate; and dividing, cutting, welding and pasting a tab adhesive tape to obtain the negative plate of the safety lithium-ion battery. The lithium-ion battery assembled by the negative plate has good electric cycle performance and safety performance.

The invention discloses a preparation method of a high-performance graphite negative electrode material for a lithium ion battery. The method comprises the following steps of 1) collecting petroleum coke micropowder in a shaper and a grinder in normal graphite production, and mixing the petroleum coke micropowder, ground expanded graphite powder, raw mesocarbon microbeads and an adhesive in a mixer for 0.5-3 hours according to a mass ratio of 1 to (0.01-0.3) to (0.7-1.5) to (0.1-0.2) to form a solid-phase coated mixture, wherein the frequency of the mixer is 30-50HZ; and 2) graphitizing the solid-phase coated mixture obtained in the step 1) to obtain the high-performance graphite negative electrode material for the lithium ion battery. The method is simple and feasible; micropowder wastes in a dust collector are recycled, so that the cost is reduced; the method is easy for large-scale industrial production; and the obtained graphite negative electrode material has the characteristics of high energy density, good liquid absorption and retention performance, good cycle performance, good isotropic performance, good high-rate charge/discharge performance and low expansion rate in a charge/discharge process.

The invention relates to a lithium ion battery composite cathode material which is characterized by being prepared from powder which is formed by uniformly coating amorphous carbon on the surfaces ofin situ composite Li3V2(PO4)3 and LiFePO4, wherein the powder contains the components in percentage by weight: 75.0-74.0 percent of LiFePO4, 21.8-21.8 percent of Li3V2(PO4)3 and 2.3-4.8 percent of amorphous carbon. A preparation process of the composite cathode material adopts a carbothermic reduction solid phase sintering method which comprises the following steps: mixing raw materials of FePO4,Li2CO3, NH4H2PO4 and NH4VO3 according to a stoichiometric ratio; adding petroleum coke accounting for 15-25 percent of the total weight of the raw materials; and after adding acetone to ball mill andmix the raw materials on a ball milling machine, and calcining the raw materials in argon atmosphere at 600-700 DEG C for 8-12 hours. When used as a cathode of a lithium ion battery, the composite cathode material has the advantages of simple preparation method, high charge and discharge capacity, good performance of high multiplying power charge and discharge, good cyclical stability, and the like.

The invention relates to a novel mixed super capacitor which adopts a nano MnO2 electrode as a positive electrode, an activated carbon electrode as a negative electrode and alkaline lithium hydroxide water solution as electrolyte. The positive electrode stores energy by a Faraday oxidation reduction mechanism, and the negative electrode stors energy by a double electrode layer mechanism. When the lithium hydroxide electrolyte is adopted, the reaction mechanism of the nano MnO2 electrode is different from the reaction mechanism in potassium hydroxide electrolyte or neutral water solution. Therefore, the nano MnO2 electrode has higher specific capacitance. The super capacitor has the advantages of perfect high energy intensity, high power intensity, high-rate charge and discharge performance, long circulation service life, low cost and no environmental damages and can be applied to large power charge and discharge occasions.

The invention discloses a vehicle-mounted new energy battery pack. The vehicle-mounted new energy battery pack comprises a battery box and multiple battery bodies arranged in the battery box; the battery box comprises a sealed type box body; a space partition plate is vertically arranged in the sealed type box body; the battery box is divided by the space partition plate into a battery placement region and a heat dissipation region; a fan is arranged on the battery box top plate above the battery placement region; a temperature detector is arranged in the battery placement region; multiple ventilating holes are formed in a battery fixation frame in the battery placement region; the ventilating holes are connected with the heat dissipation region to from an air circulation channel; and an air cooling apparatus is arranged in the air circulation channel. Compared with the prior art, the battery pack is arranged in the sealed box body according to the structure of the vehicle-mounted new energy battery pack, so that effects of thermal insulation and waterproofness are realized; by virtue of divisional setting, the temperature field distribution in the battery box can be improved; and by virtue of the battery bodies, the high-rate discharging performance of the lithium battery is improved, and excellent electronic conductivity and ionic conductivity and high high-rate charging-discharging performance are represented.

The invention discloses a preparation method of lithium iron phosphate. The preparation method comprises the following steps of: dissolving an iron salt, a lithium salt and a carbon source into aqueous solution of a phosphoric chelating agent, fully stirring the mixture, and filtering the mixture to remove water and obtain a precursor of the lithium iron phosphate; and putting the precursor into a high-temperature atmosphere furnace, heating to raise the temperature in an atmosphere with an argon gas, a nitrogen gas or a nitrogen-hydrogen gas mixture, and naturally cooling the precursor to the room temperature after constant temperature baking to obtain the lithium iron phosphate which is a lithium ion battery anode material. The lithium iron phosphate prepared by the method is suitable for a high-multiplying-power discharge power battery, and has the advantages of high conductivity, large specific capacity, high high-multiplying-power charge-discharge performance, and high electrochemical performance.

The invention relates to the field of ceramic diaphragms for lithium ion batteries, and discloses grafted ceramic powder, a preparation method of the grafted ceramic powder, a ceramic diaphragm, a preparation method of the ceramic diaphragm, a lithium ion battery, a battery module and a battery pack. The grafted ceramic powder comprises a ceramic nanomaterial and grafted polyolefin grafted on thesurface of the ceramic nanomaterial. The grafted ceramic powder is a one-dimensional rod-like material, has a modified surface, and can provide a more stable and uniform ceramic coating. The preparedceramic diaphragm is beneficial to improving the cycle performance of the lithium ion battery and the high-rate discharge performance of the battery.

The invention provides a modified carbon nano tube and a preparation method thereof, a lithium ion battery anode and a preparation method thereof and a lithium ion battery. The modified carbon nano tube comprises a carbon nano tube and a polar group on the surface of the carbon nano tube, wherein the polar group is -COOLi. The modified carbon nano tube provided by the invention has the characteristics of being easy to disperse, low in dispersing cost and good in electrical conductivity; compared with a lithium ion battery adopting the dispersion liquid of an unmodified carbon nano tube as a conductive agent, the lithium ion battery adopting the dispersion liquid of the carbon nano tube as a conductive agent has a lower direct current impedance and alternating-current impedance, and is greatly improved in the high-rate charge-discharge capability.

The invention discloses a preparation method of an anode material of a lithium ion cell, comprising the following steps of: (1) uniformly dispersing a Li source, a Mn source, a Ni source, a doping element and a metal element with superionic conductor attributes to prepare a precursor, wherein the metal element with the superionic conductor attributes is selected from two or two more of Ti, La andZr; (2) drying or igniting the precursor, then carrying out pretreatment to obtain pretreatment powder; (3) pressing the pretreatment powder into a sheet; (4) carrying out heat treatment for 6-24h; and (5) annealing, naturally cooling to room temperature, grinding, and sieving to obtain the anode material. In the invention, on the one hand, a crystal skeleton of the material and a Mn valence state are stabilized by using the doping element, on the other hand, a compound lithium ion superionic conductor improves a migration rate of the lithium ion in the material and improves the multiplying power property and cycling property of an electrode are improved.

The invention relates to an amorphous nanospherical active ferric phosphate hydrate, and a preparation method and an application thereof. The preparation method of the amorphous nanospherical active ferric phosphate hydrate comprises the following steps: 1, preparing a sustained release agent solution 1; 2, preparing a surfactant solution 2; 3, mixing the sustained release agent solution 1 with the surfactant solution 2 to obtain a solution A; 4, preparing a ferric nitrate nonahydrate solution; 5, dropwise adding the ferric nitrate nonahydrate solution into the solution A to prepare a solution B; 6, adding a phosphoric acid solution into the solution B to prepare a solution C; and 7, transferring the solution C into a polytetrafluoroethylene lined reaction kettle, carrying out a hydrothermal reaction, cooling the obtained reaction product, and carrying out separation and drying to obtain white powder which is the amorphous nanospherical active ferric phosphate hydrate. The method has the advantages of short reaction time, small and uniform product particle sizes, lithium iron phosphate obtained through the lithiation of the ferric phosphate hydrate prepared through the method has large tap density, and a battery product finally obtained through using the hydrate has good high-rate charge and discharge performances.

The invention discloses an accumulator, specifically a lead accumulator. An electrode plate in the invention is implemented by taking lead as substrate, lead, stibium, arsenic, copper, sulphur alloys as plate materials with electrolyte replacing fluoro-sulphuric acid solution with silicate. Advantages of the invention lie in that the lead accumulator has long service life, great high-rate charging and discharging performance, rapid charge, great deep discharging performance, great low temperature resistance performance and environment protection features. Products of the invention can be widely applicable for various bicycle dynamos, automobiles and so on.

The invention discloses a preparation method of a high-rate battery, which comprises the following steps: preparing positive electrode slurry, namely weighing a positive electrode conductive material,a positive electrode binder, a positive electrode conductive agent and a pore regulator in proportion, adding an auxiliary solvent, and mixing by a vacuum mixer to obtain the positive electrode slurry; preparing negative electrode slurry, namely weighing a negative electrode conductive material, a negative electrode conductive agent, a thickening agent, a negative electrode binder and a pore regulator in proportion, adding an auxiliary solvent, and mixing by virtue of a vacuum stirrer, so as to obtain the negative electrode slurry; preparing an electrolyte, namely weighing lithium salt, a solvent and an additive in proportion; and manufacturing a battery cell, namely preparing the lithium battery cell according to a specified design process flow; The preparation method has the advantagesof simple preparation conditions, no need of an ultrahigh temperature environment, low requirements on production conditions, and low production cost; and meanwhile, the lithium battery cell with thegap is prepared, the high-rate charging and discharging performance is excellent, and the high retention rate can be maintained during high-rate charging and discharging.

The invention relates to a porous silicon/carbon composite negative electrode material in-situ synthesized by taking porous polymer microspheres as a template, a preparation method and a lithium ion battery. The preparation process comprises the following steps of: adding porous polymer microspheres into water, heating and stirring to obtain a suspension solution; adding a silicon source into the suspension solution to obtain a mixed solution; filtering the mixed solution, washing the mixed solution with deionized water and drying the mixed solution in sequence, then adding a reducing agent, and conducting grinding and mixing to obtain an intermediate product A; treating the intermediate product A through a thermal reduction process to obtain an intermediate product B; and carrying out acid pickling on the intermediate product B, washing with deionized water, filtering, and drying to obtain a final product. Compared with the prior art, a carbon layer obtained through in-situ compounding can better improve the electrical conductivity, the cycling stability, the charge-discharge efficiency, the rate capability and other electrochemical properties of a silicon negative electrode, and the unique micro-nano pores reserve a lithium-intercalation expansion space for silicon and reduces the absolute volume change of the composite material in the charge-discharge process.