45results about How to "High rate discharge" patented technology

The invention relates to a preparation method of a mixed anode material for a lithium battery. The preparation method is characterized by comprising the following steps: doping an Ag2V4O11 material into a carbon fluoride material, wherein the doping process comprises the step of placing carbon fluoride, Ag2V4O11 and a solvent into a ball mill to be milled to form mixed slurry; drying the mixed slurry, and cooling the dried slurry to obtain a dried mixture; screening the dried mixture to obtain the mixed anode material for the lithium battery. According to the preparation method disclosed by the invention, the Ag2V4O11 material is mixed with the carbon fluoride material, the two substances are mixed through an additive, and the Ag2V4O11 material is good in high-rate discharge performance, so that the initial voltage lagging problem of carbon fluoride can be solved, the discharge performance of carbon fluoride can be effectively improved, the high rate discharge of a lithium-carbon fluoride battery system can be greatly improved, the low-temperature heavy current discharge of the lithium-carbon fluoride battery can be improved, and the application range of the lithium-carbon fluoride battery system can be expanded.

The invention discloses a composite positive electrode material and a preparation method and an application thereof, and belongs to the technical field of preparation of an electrochemical power supply material. The composite positive electrode material provided by the invention adopts a core-shell structure, wherein the inner core is metal oxide-doped and composite carbon material-coated lithiummanganese iron phosphate, and the shell is metal oxide-doped and composite carbon material-coated lithium vanadium iron phosphate. The composite positive electrode material provided by the invention has excellent cycle life, high-rate discharging and low-temperature performance and safety performance, as well as relatively high energy density. When the composite positive electrode material is at 0.5C rate, the initial discharging specific capacity of a button cell is greater than 155mAh / g, and after 100 cycles, the capacity retention ratio is greater than 95%.

The invention relates to a surface finish method of a carbon fluoride material. The method comprises the following steps: (1) mixing nanometer copper and carbon fluoride, then adding a solvent for ball milling so as to form a combined pulp; (2) drying the mixed pulp so as to form a mixture; (3) screening the mixture so as to obtain the powder mixture; (4) putting the powder mixture into an atmosphere oven so as to be calcined; (5) taking out the calcined powder mixture, lowering the temperature of the calcined powder mixture to the room temperature, and then screening the calcined powder mixture of which the temperature is lowered so as to form the carbon fluoride material modifies by the nanometer copper. According to the invention, the carbon fluoride and the nanometer copper with good conductivity are mixed, and after the mixture is calcined at a high temperature in an inert atmosphere, the nanometer copper reacts on the surface of the carbon fluoride, so that the phenomenon that the voltage of carbon fluoride is delayed is obviously improved, and high-ratio discharge and low temperature performance are greatly improved. The carbon fluoride with a finished surface, prepared by the method, is used as a positive material to be made into a lithium-carbon fluoride battery system, wherein the lithium-carbon fluoride battery system has the properties of high-ratio discharge and low temperature high-current discharge, so that the application range of the lithium-carbon fluoride battery system is extended.

The present invention relates to the technical field of lithium batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises: (1) mixing a manganese source and a zinc source in an organic solvent evenly, and then adding terephthalate Formic acid, mixed evenly, sealed and reacted at 120-180°C for 3-8 hours to obtain precursor A; (2) heat-treating precursor A at 180-250°C in a water vapor atmosphere to obtain the lithium-ion battery negative electrode material; In the present invention, the manganese source and the zinc source are simultaneously reacted with the terephthalic acid ligand to generate zinc-doped Mn(PTA) n , the precursor A is heat-treated in water vapor to obtain Mn x Zn 1‑x O‑PTA material, which is a metal oxide organic framework with manganese dioxide and zinc dioxide as active centers, this structure can reduce the volume change of manganese dioxide during charging and discharging, thereby improving material stability and reducing The internal resistance of the material can extend the cycle life of the manganese dioxide electrode material and improve the performance of rate discharge.

The invention belongs to the technical field of batteries, and particularly relates to a battery diaphragm and a preparation method thereof. The battery diaphragm provided by the invention comprises abase film and a PVDF / PMMA composite coating arranged on at least one side face of the base film in a coating manner; and preferably, the battery diaphragm comprises a base film and PVDF / PMMA composite coatings arranged on both sides of the base film in a coating manner. According to the battery diaphragm provided by the invention, a PVDF / PMMA composite coating is obtained by spraying a mixed slurry of PVDF and PMMA on at least one side face of the base film in a spraying manner, and the prepared battery diaphragm has low air permeability value added, has excellent bonding performance, needlepunching strength, tensile strength and heat shrinkage performance, and can improve the rate discharge and cycle performance of the battery.

The invention discloses a binding agent coateing the surface of a diaphragm as well as a preparation method and application of the binding agent. The binding agent is prepared from acrylonitrile, methyl methacrylate, an unsaturated carboxylic acid monomer, acrylamide, water and an initiator; the mol ratio of the acrylonitrile to the methyl methacrylate to the unsaturated carboxylic acid monomer to the acrylamide to the water is (1.5 to 2.5) : 1 : 1 : (0.5 to 1) : (6.67 to 55); the initiator accounts for 0.5 percent to 0.8 percent of the total mass of reaction materials. By coating between the diaphragm and positive and negative pole pieces with the binding agent, the binding is firm and a boundary has no gap; a transmission way of lithium ions is shortened and a high-temperature energy storage property of batteries can be improved; the safety of the batteries under a working condition is improved; furthermore, the diaphragm of the binding agent is utilized, so that the liquid preserving amount of electrolyte can also be increased, and rate discharge and circulating properties are improved.

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery with high stability, comprising a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the negative electrode comprises a negative electrode active material, a conductive agent and a binder, and is characterized in that: The negative electrode active material is Mn x Zn 1‑x O‑PTA, where 0.1≤x≤0.5; in the present invention, the manganese source and the zinc source are simultaneously reacted with terephthalic acid ligands to generate zinc-doped Mn(PTA) n , heat treatment of precursor A in water vapor to obtain Mn x Zn 1‑x O‑PTA material is a metal oxide organic framework with manganese dioxide and zinc dioxide as active centers. This structure can reduce the volume change of manganese dioxide during charging and discharging, thereby improving material stability and reducing The internal resistance of the material can prolong the cycle life of the manganese dioxide electrode material and improve the performance of the rate discharge.