33results about How to "Excellent high rate charge and discharge performance" patented technology

The invention relates to a titanium dioxide/graphene nanocomposite material, a preparation method of the nanocomposite material and application of the nanocomposite material in the field of energy source and cleaning environment. The graphene accounts for 1-25wt% and the balance is titanium dioxide. Morphology of the titanium dioxide is a mesoporous structure or a structure with a dominant high energy surface, and titanium dioxide is scattered uniformly on the surface of graphene. According to the invention, by adopting a titanium source and graphene as initial materials, and water or organic solvents as reaction solvents, the nanocomposite material with titanium dioxide with the mesoporous structure or a titanium dioxide nano sheet with the dominant high energy surface compounded with graphene can be obtained through hydrothermal synthesis or a hydrolysis reaction. The invention can be carried out in an aqueous solution system and the crystallinity of the product is high. The composite material can be applied to a cathode material of a power ion battery, has a higher charge-discharge capacity, is excellent in high current charge and discharge, stable in circulating performance, has very good photocatalytic performance and can be used to light degradation of organic pollutants and water photolysis for preparing hydrogen.

The invention provides a method for preparing nano-graphite with an electric arc method. Graphite rods are taken as two poles of an electric arc furnace, electric arc discharge is performed under the high-current and helium atmosphere, a graphite rod of the positive pole is continuously consumed in the electric arc discharge process, and graphite can be obtained in an inner wall area of a reaction chamber. The graphite prepared with the method has a smaller size, the migration path of lithium ions is short when the graphite is used as a lithium ion battery anode material, and accordingly, the graphite has excellent high-rate charge-discharge performance.

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a manufacturing method of a lithium ion battery containing gel electrolyte. The manufacturing method comprises the steps of preparation of a micro-pore isolating diaphragm plate, preparation of a cell, pouring of the electrolyte, after-treatment and the like. Compared with the prior art, the manufacturing method provided by the invention adopts a two-step method to polymerize gel; a good cathode pole sheet/electrolyte interface and a good anode pole sheet/electrolyte interface are formed on the cell by a pre-gelling step; in a formation process, a cathode activity material and an anode activity material can be sufficiently activated; the lithium ion battery is pressurized in a heating process after the formation is completed, so that air bubbles generated in the formation process of the battery and existing between the cathode pole sheet/electrolyte interface and the anode pole sheet/electrolyte interface can be removed; and an interface gap can be smaller, thereby being beneficial to the generation of the cathode pole sheet/electrolyte interface and the anode pole sheet/electrolyte interface. Therefore, the battery has better electrochemical performance.

The invention provides a chemical power supply. The chemical power supply comprises an anode, a cathode, an isolation film and electrolyte, and is characterized by being formed by mixing a lithium ion battery and the inner part of a super capacitor, wherein the cathode is subjected to the pre-doping lithium process, so that the SOC (State of Charge) of the cathode is 30%. According to the chemical power supply, particularly the lithium titanate-based chemical power supply provided by the invention, not only is high-multiplying power charging and discharging performance good, also the cycle service life is long, the internal resistance can not be increased, and the gas expansion can be occur after the long-term use of the chemical power supply, the safety is high, and the circulation performance and the power performance are good, so that the chemical power supply has wide application field.

The invention provides a preparation method of a lithium titanate material, the lithium titanate material, and a lithium ion battery. The preparation method comprises the steps that: a mixture containing a lithium source and a nickel source is subjected to primary ball milling; the mixture is calcined, such that a precursor is obtained; the precursor is mixed with a titanium source, and the mixture is subjected to secondary ball milling; and the mixture is calcined in an inert or reductive atmosphere, such that the lithium titanate material is obtained. With the method, the prepared lithium titanate material has excellent rate discharge performance, and is especially suitable to be applied in fields such as power batteries which require high-rate charging and discharging.

It is an object of the present invention to provide an active material for lithium ion battery capable of producing a lithium ion battery having an excellent high rate charge and discharge performance and a lithium ion battery having an excellent high rate charge and discharge performance.

The present invention provides an active material for lithium ion battery represented by a composition formula: Li[Li_(1-x)/3Al_xTi_(5-2x)/3]O₄ (0<x<1) in which a part of the element of lithium titanate is substituted with Al, and a lithium ion battery using this active material as a negative electrode active material.

The invention relates to a method for preparing anode material lithium vanadium phosphate by adopting quenching, which comprises the following steps: mixing a lithium source compound, a vanadium source compound, a phosphorus source compound and a fluoride at a molar ratio of lithium : vanadium : phosphorus : fluorine = (1-1.05):1:1:1, adding a carbon source at a molar ratio of the carbon source : the vanadium source compound = 1:1-10:1, performing high-energy ball-milling for uniform mixing to obtain a precursor mixture, drying the precursor mixture, placing the dried precursor mixture in a non-oxidizing atmosphere and heating to 500-1000 DEG C, performing constant-temperature calcination for 0.5-48 h, rapidly transferring the high-temperature powder to a low-temperature medium (-209-40 DEG C), and allowing rapid quenching for a period from 1 min to 1 h to obtain lithium vanadium phosphate powder. The lithium vanadium phosphate powder prepared by using the quenching method provided by the invention has nano size, uniform particle size distribution, and excellent large-multiplying factor charging/discharging performance.

The invention provides a negative plate and a lithium ion battery comprising the same. The negative plate contains a negative active material, and the negative active material has the following characteristics: the particle size distribution Dv10/Dv90 is greater than 0.35; the specific surface area is 2-3m < 2 >/g; and the tap density is 1.0-1.3 g/cm < 3 >. The high-rate charge-discharge performance of the negative plate is excellent, the low-temperature charge-discharge polarization of the negative plate is smaller, the start-stop/HEV lithium ion battery has excellent performance in low-temperature high-rate charge-discharge, and the application prospect of the negative plate is wide.

The invention discloses a lithium battery positive electrode material surface transmission efficiency regulation and control method and an obtained positive electrode material. The method comprises the following steps: S1, uniformly mixing two or more polymers according to a certain ratio to obtain a polymer mixed solution; S2, dispersing a lithium battery positive electrode material into the polymer mixed solution to obtain a suspension; and S3, heating the suspension, and drying a powder to obtain the final polymer-coated lithium battery positive electrode material. A polymer composite coating layer is formed on the surface of the positive electrode material, the elasticity of the polymer and a cross-linking property between two or more polymers are utilized, a defect of interface incompatibility is eliminated while multiple electron/ion channels are constructed, the compactness and completeness of a coating structure are realized, and different polymers are coated so that electron/ion transmission efficiency of an interface can be regulated and controlled. The method is simple, convenient, low in cost and high in raw material selectivity. Universality is high, and a commercial application is easy.

The invention discloses a preparation method of transition metal regulated and controlled needle coke and application of the transition metal regulated and controlled needle coke in a lithium ion battery, the transition metal regulated and controlled needle coke is prepared by the following steps: by taking coal-based needle coke as a substrate, activating the coal-based needle coke, performing hydrothermal mixing treatment on the activated coal-based needle coke and transition metal salt, and performing simple roasting to modify the surface by metal, thereby obtaining the transition metal regulated and controlled needle coke. And metal on the surface is removed through low-concentration acid pickling to obtain the high-performance electrode material. The method disclosed by the invention is simple in preparation process, safe, effective and short in operation time, shows excellent cycle performance and rate charge-discharge performance as a lithium ion battery negative electrode material, and has a wide application prospect in the field of energy storage.

The invention discloses a preparation method and application of a high-performance lithium ion power battery/porous carbon composite positive electrode material. The preparation method comprises the following steps: performing refluxing on porous carbon with nitric acid at 40-60 DEG C for 0.5-2 hours; adding lithium carbonate/lithium nitrate/lithium acetate, ammonium metavanadate, ammonium dihydrogen phosphate and citric acid into a reactor according to the mole ratio of 3 to 2 to 3 to (1-3), adding a proper amount of deionized water and ethyl alcohol, stirring by a magnetic stirrer for 10-30 minutes, then adding porous carbon, further stirring for 10-15 minutes, carrying out ultrasonic treatment for 5-10 minutes, and drying at 50-80 DEG C for 2-3 hours; and forging the obtained powder in a N2 atmosphere tubular furnace at 700-900 DEG C for 4-6 hours, thereby obtaining the Li3V2(PO4)3/porous carbon composite material. The preparation technology is simple, the cost is low, the energy consumption is low, the reproducibility is good, and the high-performance lithium ion power battery/porous carbon composite positive electrode material can be produced on a large scale, and conforms to the environment requirement.