70results about How to "Improve charge and discharge rate performance" patented technology

The invention is suitable for the technical field of batteries, and provides a lithium iron phosphate composite material, its preparation method and an application. The lithium iron phosphate composite material has a nanoparticle structure with lithium iron phosphate nanocrystals as the core. The external surface of the nanoparticle structure is covered with a nano-carbon particle coating, the external surface of which is covered with grapheme. The chemical composition of the lithium iron phosphate nanocrystals is LiFe1-xMxPO4, wherein M is metal ions and x is being less than 1 and greater than or equal to 0.001. By cladding the nano-carbon particles with the lithium iron phosphate crystals, adding grapheme and adding metal ions in the lithium iron phosphate crystals, conductivity of the lithium iron phosphate composite material in the embodiment of the invention is greatly improved. Simultaneously, the nano particle size of the lithium iron phosphate crystals guarantees rapid charge and discharge of the lithium iron phosphate crystals in the embodiment of the invention.

The invention discloses a lithium ion battery and a positive electrode piece thereof. The positive electrode piece comprises a positive electrode current collector, a priming coat coated on the positive electrode current collector and a positive electrode diaphragm coated on the priming coat, the positive electrode current collector is aluminum foil, and the positive electrode diaphragm contains a positive electrode active material and a PVDF homopolymer binder; and the priming coat comprises a conductive agent and acrylic acid modified polyvinylidene fluoride copolymer (Ac-PVDF) used as a binder. The priming coat is introduced to the positive pole electrode piece of the lithium ion battery, the priming coat mainly contains the acrylic acid modified polyvinylidene fluoride copolymer and the conductive agent, the Ac-PVDF can significantly increase the adhesion between the positive electrode diaphragm and the positive current collector, and the conductive agent can reduce the interface resistance, so the charge and discharge performance of the battery is improved, and the cycle life of the battery is prolonged.

The invention discloses an electrospinning preparation method for cobaltosic oxide carbon nanometer fibers for a sodium-ion battery. An electrospinning precursor liquid is prepared from Co2+ salts, polyvinylpyrrolidone and an organic solvent, a Co2+ salt/PVP composite fiber membrane by adopting an electrospinning method, then preparing Co3O4 carbon nanometer fibers through an air atmosphere calcination technology, and prepared Co3O4 crystals have a regular hexagonal nano-sheet structure and are uniformly inlaid in the carbon nanometer fibers to enable a material to have larger specific surface area. According to the electrospinning preparation method, with unique carbon nanometer fiber porous structure and ultrathin nano-sheet crosslinking structure, permeation of electrolyte and electron/ion transfer are effectively promoted, the diffusion path of sodium ions in the material is shortened, embedding and disembedding of the sodium ions are facilitated, the capacitance is higher, the cycling stability is better, and the dynamics performance of the material is greatly improved. The electrospinning preparation method is simple in technology and low in cost.

The invention belongs to the technical field of battery materials, and particularly relates to an anode material, a preparation method of the anode material, an anode, a lithium ion total battery, and a manufacturing method of the total battery. The anode material provided by the invention comprises a Na2Ti3O7 nano-tube material; a synthesis method of the nano-tube material comprises the following steps: mixing TiO2 nano-powder and alkali solution, conducting a heating reaction under high pressure, and then, washing a precipitate, generated after a reaction, with water, drying and annealing at 300 to 500 DEG C. According to the anode material provided by the invention, the synthetic raw materials are wide in source and easy to obtain; the cost is low; the charge-discharge rate performance is ultrahigh; the reversible discharge capacity of the anode material reaches 350 mAh/g; and the lithium ion total battery through combination of the anode material has the energy density at a battery level and the power density similar to a capacitor.

The invention belongs to the technical field of lithium ion batteries and particularly relates to an adhesive for a negative pole material of a lithium ion battery. The adhesive is a polyacrylic acid type polymer, and the polyacrylic acid type polymer is formed by condensation of polyacrylic acid and a polyether type high molecular polymer, wherein the polyacrylic acid accounts for 10-30% by weight of the total weight of the polyacrylic acid type polymer. The adhesive disclosed by the invention adopts the water-soluble polyether type polymer with high lithium ion conductivity to modify carboxylic acid groups in the polyacrylic acid. Therefore, the obtained novel polyacrylic acid type polymer after modification can be used as the adhesive for the negative pole material of the lithium ion battery, the first charge-discharge efficiency of the battery can be effectively improved, and the high-temperature circulation performance, high-temperature storage performance, charge-discharge rate and low-temperature rate performance of the battery are also greatly improved. In addition, the invention further discloses a preparation method of a lithium ion electrode.

The present invention discloses a three-dimensional hollow carbon foam electrode materials, a preparation method of the three-dimensional hollow carbon foam electrode materials and an application of the three-dimensional hollow carbon foam electrode materials. The method concretely comprises the following steps: mixing zinc nitrate, fuel and deionized water to perform full stirring and dissolution, putting the mixed solution on an electric furnace for heating until viscidity cementing products are obtained, the products are arranged in a muffle furnace for annealing to obtain zinc oxide template materials with multi-stage holes, and preparing charcoal electrode materials with multistage apertures through adoption of a template method. Compared to the prior art, the reaction materials are wide in source, low in cost and environmentally friendly, the synthesis steps are simple, the raw materials is nontoxic and safe and mild in reaction condition, and the method for removal of temperature materials is unique so as to fit large-size production and commercialization application. The prepared multi-stage hole carbon materials have multistage aperture structures having micropores, mesoporouses and macroporouses, large in specific surface area, have excellent charge and discharge multiplying power characteristics and cycle stability in an application and can satisfy the application requirement of an electrochemistry power storage device.

The invention belongs to the technical field of batteries, and particularly relates to power battery oil-based negative electrode slurry. The slurry comprises the following components in parts by mass: 93 to 96.5 parts of a negative active substance, 1.5 to 4.5 parts of a binder, 1 to 2 parts of a conductive agent, 0.05 to 1 part of a defoaming agent and 70 to 100 parts of a solvent, wherein the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone. Compared with the prior art, the scheme of the invention solves the problem that in the preparation of the existing slurry, alarge amount of bubbles are generated when the viscous slurry is stirred at high speed after an oily bonding system is added, the large amount of bubbles are difficult to be removed, the decrease inthe quality of electrode sheets is further caused, and the electrochemical performance is affected. In addition, the invention also provides a preparation method of the power battery oil-based negative electrode slurry, which reduces the batching time, improves the stirring process, increases the production efficiency, and reduces the energy consumption.

The invention relates to modified zinc oxide and a preparation method and application thereof, in particular to a zinc negative electrode material for an alkaline zinc-air secondary battery, and belongs to the field of an air battery. The modified zinc oxide comprises a zinc oxide inner core, a first coating layer and a second coating layer, wherein the first coating layer is coated on the zinc oxide inner core, the second coating layer is coated on the first coating layer, the material of the first coating layer is C, and the material of the second coating layer is a titanium sub-oxide. The preparation method of the modified zinc oxide comprises the steps of growing a layer of phenolic resin on a surface of zinc oxide in an in-situ way; coating a layer of titanium-based organic-inorganicmixed gel; and performing reaction at 760-880 DEG C to obtain the product with the designed structure. When the product is used as a zinc negative active material of the alkaline zinc-air secondary battery, the product shows excellent electrochemical performance. The material is reasonable in structural design, the preparation process is simple, the obtained product has favorable performance, andindustrial application on a large scale is convenient.

The invention discloses a preparation method of a hexagonal lamellar SnS2 sodium-ion battery anode material. The preparation method comprises the following steps: 1) dissolving thioacetamide into deionized water to obtain a solution A; 2) adding hexadecamethyl trimethyl ammonium bromide in the solution A to obtain a transparent clear solution C; 3) dissolving stannic chloride pentahydrate into the transparent clear solution C according to the element molar ratio of nSn to nS being 1.0 to (1.2 to 2.4), and uniformly mixing a mixture to obtain a mixed solution D; 4) regulating a pH value of the mixed solution D to be 1 to 9 so as to form a solution E; 5) carrying out microwave hydrothermal reaction on the obtained solution E; and 6) washing and freeze drying a product to obtain the hexagonal lamellar SnS2 sodium-ion battery anode material. The preparation method has the characteristics of low preparation cost, simpleness in operation and short preparation cycle. A prepared product has the lamination thickness reaching several to several tens nanometers, is high in purity, strong in crystallinity and uniform in morphology and has excellent charge-discharge rate performance by being applied to a sodium-ion battery anode.

The invention discloses a method for preparing a lithium iron phosphate cathode material with high-compaction and high-rate performance, and relates to the technical field of lithium ion battery cathode materials. The method comprises the following steps of: according to a mass ratio of 100:4.5:(0.5-4), adding and dispersing a layered mesoporous graphite phase carbon nitride powder g-C3N4, PVP anda carbohydrate to deionized water to obtain a dispersion A; weighing FePO4 according to a mass ratio of FePO4:g-C3N4=50:(0.8~1.5), and adding and dispersing the FePO4 to the dispersion A to obtain adispersion B; weighing a lithium source according to a stoichiometric ratio of Fe:Li=1:1, and adding and dispersing the lithium source to the dispersion B to obtain a dispersion C; ultrafine grindingthe dispersion C, spray-drying the dispersion C, and then presintering and sintering the dispersion C under a protective atmosphere, naturally cooling a product so as to obtain the lithium iron phosphate cathode material. The method uses the g-C3N4 as a layered template and a main carbon source, and uses the excellent dispersing property of the PVP for shape control and modification in the processof lithium iron phosphate, thereby greatly improving the compaction and charge-discharge rate performance of the lithium iron phosphate cathode material.

The invention discloses a silicon-carbon negative electrode material and a preparation method and application thereof. The method comprises the steps of adding silicon powder and a solid carbon sourceinto a V-shaped mixer for mixing; adding a liquid carbon source into the V-shaped mixer in a spraying form, and further mixing to obtain a mixture; sending the mixture to a high-speed crusher, drawing a liquid carbon source into a film to coat the surface of the mixture of the silicon powder and the solid carbon source, and obtaining a mixture containing a coating layer ; and roasting the mixturecontaining the coating layer in an inert atmosphere to obtain the silicon-carbon negative electrode material. By adopting the method, the silicon-carbon negative electrode material with uniformly dispersed silicon and carbon and stable compounding can be prepared, and the expansion of silicon during charging and discharging processes can be suppressed. Compared with a silicon-carbon negative electrode material prepared by adopting an existing preparation process, the silicon-carbon negative electrode material prepared by adopting the preparation process has better charge-discharge performance, cycle performance and charge-discharge rate performance. The preparation method is simple to operate. A drying process of a traditional preparation process is abandoned. Industrial production is facilitated, and the production cost is reduced.

The invention discloses a method for manufacturing a fast-charging long-circulating graphite negative pole piece, which comprises the steps of 1) crushing petroleum coke, 2) mixing petroleum coke particles, a high-temperature asphalt binder and stearic acid, 3) carrying out multi-stage temperature coating and bonding, 4) cooling to the room temperature, 5) adding Fe3O3 for graphitization treatment, 6) coating a nano Fe3O4 ionic liquid and carrying out magnetization treatment; and 7) drying to obtain the finished product. The method not only can improve the graphitization degree, greatly reducethe graphitization temperature of various amorphous carbons and improve the first charge-discharge efficiency and circulation stabilization of a graphite negative pole material, but also coats magnetic nanoparticle Fe3O4 on the surface, carries out the magnetization treatment and greatly reduces the OI value of the pole piece.

The invention belongs to the technical field of lithium ion battery, and especially relates to a positive electrode sheet of a lithium ion battery. The positive electrode sheet is provided with a crack structure, wherein the opening of the crack structure is provided on the surface layer of the electrode sheet. With the crack structure, absorption rate of the electrode sheet upon electrolyte can be greatly improved, and standing time after liquid injection of the lithium ion battery can be reduced. In a lithium ion battery with the crack structure, with the existence of the crack, a highway is provided for rapid transmission of the electrolyte in the electrode sheet, and battery charge/discharge rate capability is greatly improved. Also, the invention discloses a lithium ion battery.

The invention discloses a sodium-ion battery negative electrode material with Ce doped with SnS2 and a preparation method of the sodium-ion battery negative electrode material. The preparation method comprises the following steps: 1, preparing a SnCl4.5H2O solution, a Ce(NO)3 solution and a NaS.9H2O solution; 2, uniforming the solutions obtained in step 1 according to the mole ratio of Sn to S to Ce, namely nSn: nS: nCe= (1.0-2.5): (2.0-4.3): (0.005-0.01), so that a mixed solution D is obtained; 3, placing the mixed solution D in a hydro-thermo-electric deposition reaction still for conducting an arc discharge hydrothermal reaction; 4, conducting filtration, separation and washing, so that a precursor is obtained, and conducting freeze-drying on the precursor, so that the sodium-ion battery negative electrode material with Ce doped with SnS2 is obtained. A product prepared through the preparation method is of a flowerlike structure assembled by nanosheets, the slice layer shape thickness reaches 10-20 nm, the ball-flower shape diameter is about 300-400 nm, under the current density of 100 mA/g, the initial discharge capacity can reach 1493 mAh/g, and after 50 cycles are ended, the capacity is maintained to be 460 mAh/g.

The invention belongs to the technical field of lithium ion battery, and especially relates to a lithium ion battery negative electrode sheet. The negative electrode sheet is provided with a crack structure with an opening arranged on the surface layer of the electrode sheet. With the crack structure, the absorption speed of the electrode sheet upon electrolyte can be greatly improved, and lithium ion battery settlement time can be reduced after injection. In a lithium ion battery with the crack structure, with the crack, a highway is provided for fast transmission of the electrolyte in the electrode sheet, such that battery charge/discharge rate performance can be greatly improved. The invention also discloses a lithium ion battery.

The invention discloses a preparation method of a SnS2 sodium-ion battery anode material with a cubic structure. The preparation method comprises steps as follows: 1), sodium thiosulfate is dissolved in deionized water, a solution A is prepared, stannic chloride pentahydrate is dissolved in the equal amount of deionized water, and a solution B is prepared; 2), the solution B is dropwise added to the solution A, a solution C is obtained, hexadecyl trimethyl ammonium chloride is gradually added to the solution C, and a solution D is obtained; 3), the solution D is subjected to ultrasonic oscillation in an ultrasonic generator; 4), pH of the mixed solution D after ultrasonic oscillation treatment is regulated, and a solution E is prepared; 5), the solution E is subjected to a hydrothermal reaction; 6), after the reaction, a precursor is taken out, centrifugally washed with ionized water and anhydrous ethanol and then subjected to freeze drying, and the SnS2 sodium-ion battery anode material with the cubic structure is obtained. The preparation method is low in preparation cost, simple to operate and short in preparation cycle, and the prepared SnS2 sodium-ion battery anode material with the cubic structure has excellent charge-discharge rate performance.

The embodiment of the invention relates to an active material, an electrode, a secondary battery, a battery pack, and a vehicle. The invention provides the active material of the secondary battery which can achieve both high energy density and excellent charge-discharge rate performance, the electrode including the active material, the secondary battery including the electrode, the battery pack equipped with the secondary battery, and the vehicle equipped with the battery pack. According to one approach, an active material including a composite oxide is provided. The composite oxide has a monoclinic crystal structure and is represented by the general formula LiwM12-xTi8-yM2zO17+delta , wherein: M1 is at least one selected from the group consisting of Cs, K, and Na; M2 is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al; 0 <=w <=10; 0 < x < 2; 0 < y < 8; 0 < z < 8; and -0.5 <=delta <=0.5.

The application discloses a lithium ion battery with a positive electrode and a negative electrode arranged at the same side and a manufacturing method thereof. The lithium ion battery comprises a shell with an opening structure at an upper end, a naked cell held in the shell and provided with lugs at the left side and the right side, and a shell cover arranged at the upper opening of the shell and provided with poles at the left side and the right side; one end of the pole extends into the shell, and a lug connecting seam corresponding to the lug is formed on the pole extending into the shell; the lug extends into the lug connecting seam on the pole, and the lug is connected with the pole through the friction-stir welding process; the shell cover and the shell are connected together through the friction-stir welding process. By using the lithium ion battery disclosed by the application, the battery production efficiency and yield are improved, the battery capacity and the energy density are improved, the welding quality and the battery rate discharge performance are promoted, and the equipment input cost in the battery production process is lowered.