43results about How to "Improve voltage hysteresis" patented technology

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 is lithium cell with foamed nickel material as current collector and its making process. This kind of lithium cell is obtained through the process including ultrasonic wave treatment, coating, and rolling or negative pressure adsorption to fill active matter, copper powder, PTFE emulsion, distilled water and alcohol into foamed nickel electrode. The lithium cell making process includes main steps of compounding material, filling, drying, pressurizing, etc. The present invention has obviously lowered electrochemical polarization of lithium cell, improved electron conducting path of electrode, improved heavy load work capacity, low temperature performance, lagging characteristic, etc of cell, and raised safety performance.

The invention discloses a preparation method of an Ag@C-modified fluorinated carbon electrode material. The method comprises the following steps of: mixing an Ag compound and a solvent, adding carbonfluoride, 15-25 parts of NaOH or KOH aqueous solution, parts by mass fraction, adding reducing agent for action after temperature rise, performing filtering, washing, drying and grinding, and performing 100-200mesh screening to prepare an Ag@C-modified fluorinated carbon electrode material. Part of fluorinated carbon material is restored to C while restoring the Ag compound to Ag by employing thechemical reduction method. The Ag@C is employed to perform modification of the fluorinated carbon material, and the surface of the fluorinated carbon material is uniformly coated with the Ag@C to increase the conductivity of the fluorinated carbon material, effectively improve the problems of the voltage hysteresis and low-temperature performance of the fluorinated carbon material and improve therate performance of the lithium fluorocarbon battery.

The invention discloses a method for preparing a modified carbon fluoride positive electrode material, which comprises the following preparation steps: (1) selecting raw materials: including carbon fluoride, additional carbon source, and binder; (2) modifying the carbon fluoride positive electrode Material preparation: Mix fluorocarbons, additional carbon sources and binders according to a certain proportion, put them into a sintering furnace under a nitrogen atmosphere, control the reaction temperature in the furnace, carry out carbothermal reduction treatment on the materials for a certain period of time, and then cool down to obtain The material is the modified carbon fluoride cathode material in the present invention. The present invention utilizes carbothermal reduction method to process fluorinated carbon, improves the electronic conductivity of the material, reduces the internal resistance and polarization phenomenon of the lithium/carbon battery during discharge, and improves the initial voltage hysteresis of the lithium/carbon fluorinated battery. Rate discharge performance.

The invention discloses a pitch carbon coated fluorocarbon cathode material and a preparation method thereof. The preparation method comprises the following steps: mixing fluorocarbon with pitch, performing heat treatment on the obtained mixture and sieving the mixture to obtain the pitch carbon coated fluorocarbon cathode material. According to the method, fluorocarbon is coated with pitch carbon, and by improving binding force between the fluorocarbon surface and a carbon source, the electric conductivity of the material is improved to a greater extent, so that the discharge voltage plateau, specific capacity and high-current discharge performance of the material are improved substantially. The method has the advantages of low cost, simple equipment, simple and easily controllable process conditions, high yield and the like and is quite suitable for large-scale industrial production.

The present invention is improved preparation process of electrolyte for lithium thionyl chloride. The SOCl2 solution is first rectified, then added with LiAlCl4 and metal lithium and heated and reflux purified for at least 12 hr, SO2 gas is injected into the solution, and in dry environment, the solution is filtered to prepare the electrolyte. The electrolyte has raised purity and can improve the voltage lag state of the lithium cell effectively.

The invention relates to a preparation method of a fluorinated nanometer graphite as a cathode material of a lithium fluoride carbon battery, belonging to the technical field of the cathode material of the lithium battery. Nano-graphite was prepared by magnetic stirring milling method as precursor. Fluorine gas and nano-graphite intercalated into carbon and fluorine at high temperature by direct fluorination method to obtain fluorinated nano-graphite. Compared with commercial graphite fluoride, the method has higher voltage plateau and higher specific capacity, and overcomes the problem of voltage hysteresis when the fluorocarbon material starts to discharge. Fluorinated graphite nanoparticles are excellent cathode materials for lithium fluoride batteries.

The invention discloses a preparation method of a nanometer material modified carbon fluoride electrode material. The method comprises the following steps: mixing a medium and carbon fluoride, addinga nanometer material, performing reaction, drying, vacuum drying and grinding, performing calcination in argon atmosphere, cooling down the medium and carbon fluoride to room temperature, grinding, and sieving the medium and carbon fluoride through a 100 to 200-mesh sieve, so as to obtained the nanometer material modified carbon fluoride electrode material; the mass ratio of the nanometer materialto the carbon fluoride is equal to (0.5-5): 100. The method has the advantages that the carbon fluoride material is modified through the nanometer material, the nanometer material is uniformly coatedon the surface of the carbon fluoride material, the conductivity of the carbon fluoride material is improved, the problems of voltage hysteresis and poor low-temperature performance of the carbon fluoride material are effectively improved, and the rate capability of a lithium carbon fluoride battery is improved.

The invention discloses a lithium-thionyl chloride button cell anode carrier and a preparation method thereof, and belongs to the field of button cells. The preparation method comprises the following steps of mixing anode powder, drying by a drying box at a constant drying oven temperature of 180 DEG C for about 15 hours, cooling the fully dried anode powder to a temperature of 90 to 100 DEG C, maintaining the temperature, heating alcohol to a temperature of 55 to 65 DEG C by hot water, rolling an anode carrier 3-5 times by a rolling mill to obtain a thin sheet, coating a binder layer on the rolled anode carrier, carrying out punching and perforation, carrying out sintering at a high temperature of 240 DEG C for 10 to 30 minutes, and carrying out cooling and sealing for next use. The preparation method has simple processes. The lithium-thionyl chloride button cell anode carrier obtained by the preparation method greatly improves cell reliability and assembly efficiency and effectively improves voltage hysteresis and large current discharging of a lithium-thionyl chloride button cell.

The invention discloses a method for modifying a carbon fluoride positive electrode material by using a chromium oxide or a chromium oxide compound, which comprises the following steps of: (1) adding CrO3 and carbon fluoride into absolute ethyl alcohol, and performing high-energy ball milling to form mixed slurry; (2) drying the mixed slurry and sieving the dried mixed slurry with a 100-200-mesh sieve to obtain mixed powder; (3) putting the mixed powder in an air atmosphere furnace, and heating the mixed powder to 196-240 DEG C to obtain a molten-state mixture; and (4) stirring the molten-state mixture for 2 hours to fully and uniformly mix the carbon fluoride and the molten-state CrO3, heating and calcining the mixture, taking out a product, cooling and grinding the product, and sieving with a 100-200-mesh sieve to obtain the carbon fluoride positive electrode material modified by the chromium oxide or the chromium oxide compound. According to the obtained material, the problem of voltage lag at the initial stage of discharge is effectively solved, the rate capability and platform voltage of a lithium carbon fluoride battery are improved, the temperature rise of the lithium carbon fluoride battery in the discharge process is reduced, and the preparation method is simple and low in cost.

The invention discloses a manufacturing method for a lithium thionyl chloride battery electrolyte. The manufacturing method specifically comprises the following steps of putting LiAlCl<4> into a dry container, and rectifying and purifying SOCl<2>; pumping SO<2> gas into the LiAlCl<4>, and then standing for 15-20h after the SO<2> is completely pumped; pumping a proper amount of water vapor to BrCL, and performing a complete reaction to obtain HCl and HBrO; adding the rectified and purified SOCl<2>, HCl and HBrO into a lithium salt product after the SO<2> is completely pumped; and then adding a lithium sheet, and maintaining a humidity dew-point temperature value of the container to be lower than minus 35 DEG C to obtain the electrolyte. According to the manufacturing method for the lithium thionyl chloride battery electrolyte, a proper amount of halogen or halogen compounds is added to the electrolyte; based on a principle that BrCl plus H<2>O is equal to HCl plus HBrO, the content of the halogen or halogen compounds in the electrolyte is increased; and the voltage delay condition of the battery is effectively reduced.

The invention relates to a manufacturing method for a lithium/thionyl chloride battery. The method comprises the following steps: adding calcium chloride at mass ratio of 0.02-0.05 in a production process of a cathode material, thereby obtaining the cathode material of the lithium/thionyl chloride battery containing calcium chloride; adding calcium chloride till calcium chloride is saturated in an electrolyte material in the production process of the electrolyte material, thus obtaining the electrolyte material of the lithium/thionyl chloride battery containing calcium chloride; winding the cathode material of the lithium/thionyl chloride battery containing calcium chloride, the glass fiber diaphragm and the metal lithium anode into a battery core under a dry environment at relative humidity less than or equal to 1%; packaging into a battery shell; performing girth welding on the battery, injecting the electrolyte material of the lithium/thionyl chloride battery containing calcium chloride into the battery, plugging the hole and welding according to the present technique; at last, storing the lithium/thionyl chloride battery containing calcium chloride into a hot air blower box with the temperature of 54 DEG C for 48h and thus obtaining the end product.

The invention discloses a nickel-based high-entropy alloy/carbon nanotube modified lithium carbon fluoride battery positive electrode plate. The nickel-based high-entropy alloy/carbon nanotube modified lithium carbon fluoride battery positive electrode plate comprises a current collector and an active substance coating applied onto the current collector; the active substance coating comprises the following components in percentage by mass: 70-90% of carbon fluoride powder, 5-20% of catalyst powder and 5-10% of binder, wherein the catalyst is a nickel-based high-entropy alloy/carbon nanotube composite material. According to the method, the nickel-based high-entropy alloy/carbon nanotube composite material is prepared from a compound containing an iron source, a cobalt source, a copper source, a zinc source, a nickel source and a carbon source to serve as the catalyst, and then the current collector is coated with the carbon fluoride and the catalyst; after the carbon fluoride and the nickel-based high-entropy alloy/carbon nanotubes are mixed, the conductivity of the battery positive electrode material is improved, the carbon fluoride voltage hysteresis phenomenon is improved, the capacity, the storage performance, the rate capability and the platform stability of a lithium carbon fluoride high-voltage plateau are improved, and the performance improvement of a lithium carbon fluoride battery is achieved.