32results about How to "Improve capacity stability" patented technology

The invention discloses a preparation method of a positive composite material of a graphene-lithium battery. The preparation method comprises the following steps of (1) performing coprecipitation-loading on graphene, a graphene precursor, graphene powder or graphene dispersion and a positive material of a lithium battery, namely adding the graphene, the graphene precursor, the graphene powder or the graphene dispersion and the positive material of the lithium battery in the mass ratio of 1:8 to 1:100 into a solvent to keep the concentration at 1-120 g / L, then adding auxiliaries which is 1-10 mass percent of the grapheme, adjusting the hydrogen ion concentration to be 1.0*10<-5> to 1.0*10<2> mol / L through a pH value adjustment agent, and mixing at the temperature of 10-80 DEG C for 1-96 hours to obtain a loaded product; (2) performing centrifugal separation on the loaded product, wherein one product is a solid sample; (3) roasting the separated solid sample at the temperature of 400-700 DEG C for 0.5-4 hours, and performing activation to obtain the positive composite material of the graphene-lithium battery. The preparation method disclosed by the invention has the beneficial effects that the volume specific capacity and the attenuation resistance are improved, the cycle life is long, and the capacity stability is high.

The invention relates to the technical field of battery materials, in particular to a sulfur / vanadium disulfide / MXene composite material and a preparation method and application thereof. In the preparation method disclosed in the present invention, the high specific surface area and a large number of active sites of the sulfur-loading material MXene can increase the loading capacity of sulfur; MXene has unique flexibility and good conductivity, so it can buffer the volume change of the positive electrode material And improve the conductivity of the composite material; MXene surface has a large number of functional groups and static electricity can attract vanadate ions and then undergo coordination, so that vanadate ions are evenly adsorbed on the surface of MXene, and the vanadate ions and sulfur source are formed at an appropriate temperature Uniform vanadium disulfide nanosheets are generated in situ on the surface of MXene, and the introduction of catalytically active and conductive vanadium disulfide nanosheets into MXene can chemically adsorb lithium polysulfide, and can quickly convert it into electrolyte in the electrolyte. Insoluble Li 2 S 2 / Li 2 S, thereby inhibiting the severe shuttle effect and improving the stability and cycle life of lithium-sulfur batteries.

The invention provides compound cathode slurry of graphene high-power lithium batteries, relates to the technical field of cathode slurry of lithium batteries and aims to solve the technical problems that cathode slurry used in the prior art causes reduced energy storage capacity and poor cycle performance and stability of the lithium batteries, as a result, the lithium batteries easily heat and are short in service life and low in utilization rate during usage. Thus, the invention provides the compound cathode slurry of graphene high-power lithium batteries. Compared with traditional cathode slurry for the lithium batteries, the prepared compound cathode slurry has the battery capacity reduced from 195.256 mAh / g to 193.658 mAh / g and the capacity retention rate up to 99.18% under the conditions that the temperature is 35 DGE C and 1C charge and 6C discharge are circulated 500 times, the discharge specific capacity and attenuation resistance are improved, and the high cycle life and high capacity stability are realized.

The invention relates to a manufacturing method of a super capacitor, which belongs to the technical field of new energy storage. The surface of a metal collector electrode is roughed, active material, conductive material and a compound adhesive are mixed uniformly and pressed into a pole piece with the thickness of 100-150 mum, the pole piece is stuck onto the surface of the collector electrode to form a band-shaped electrode, the electrode is cut into two electrodes with the same size, and after the two electrodes are riveted with a leading wire, an electrode diaphragm with the thickness of 10-50 mum is added to be wound into a core, the core is dried in vacuum for 8-72 hours at the temperature of 100-150 DEG C, then is soaked in an organic electrolyte and electrified for 10 hours at the temperature of 50 DEG C and the direct current voltage of 2.7V, and finally is packaged in a circular aluminum shell to obtain a super capacitor product, wherein the compound adhesive is the mixture of the substance with the general formula of (CH3) n (SiOSiOSi) mC3H6O (CpH2pOH) and polytetrafluoroethylene. The electrode manufactured by the compound adhesive disclosed by the invention is soft, has large mechanical strength and is easy for large-scale continuous production, and the service life is greatly prolonged.

The invention provides a copper tin alloy-based three-dimensional copper tin compound nanoparticle-microporous copper lithium ion battery cathode and a one-step preparation method. The lithium ion battery cathode is composed of a three-dimensional microporous copper framework with porous walls / pore orientation and copper tin compound nanoparticles. The copper tin compound nanoparticles are Cu6Sn5nanoparticles or mixed particles of Cu6Sn5 nanoparticles and Cu3Sn nanoparticles. The copper tin compound nanoparticles are dispersed and embedded in pore structures of the three-dimensional microporous copper framework with porous walls / pore orientation to form a nanoporous structure so as to finally form a double continuous opened micro-nano graded porous structure. The lithium ion battery cathode provided by the invention can alleviate huge volume change generated in circular lithium embedding and removing processes of the tin cathode material, so that the cyclic performance of the tin cathode is improved.

The invention relates to a preparation method for a lithium ion battery negative electrode material, and belongs to the technical field of a lithium ion battery. The preparation method comprises the steps of taking and placing silicate glass in a ball-milling tank, adding a sodium chloride solution for ball-milling, and sieving to obtain silicate glass powder; taking and placing Arabic gum and tragacanth gum in the ball-milling tank for ball-milling, and sieving to obtain tragacanth gum and Arabic gun mixture power; mixing the silicate glass ball-milling powder, the Arabic gum and the tragacanth gum, adding zinc powder, and performing stirring to obtain a colloid powder mixture; filling the colloid powder mixture in a die, performing pressing and pressure preservation, placing the die in abaking box, and performing standing and cooling to a room temperature after thermal curing to obtain a cured material; and placing the cured material in a tubular atmosphere furnace, introducing nitrogen to remove air, controlling a temperature, performing heat preservation and carbonization, and performing standing and cooling to the room temperature, thereby obtaining a silicon carbon compositenegative electrode material. The obtained negative electrode material has good rate performance, high capacity and good conductivity, and the application of the silicon negative electrode material isexpanded by electrical contact.