34results about How to "Improve lithium intercalation capacity" patented technology

The invention relates to a method for preparing layered tin coatings in an electrolytic deposition manner. According to the method, the problem that an existing tinning method can only prepare bright compact coatings is solved. The method comprises the steps of removing oil on a coated part in an alkaline manner, rinsing the coated part, and pickling the coated part; then rinsing the coated part again, and drying the coated part to obtain an electroplating negative pole and using elementary substance tin as an electroplating positive pole; and setting the electroplating current density as 2-5A / dm<2>, the electroplating temperature as 10-35 DEG C and the electroplating time as 3-9min to obtain the layered tin coatings. Plating solution comprises stannous mono sulphate, concentrated sulfuric acid, gelatin, additive and ascorbic acid. The method can be used for preparing tin coatings of a layered structure in the electrolytic deposition manner, the plating solution is simple in composition, and the electroplating process is easy to control. The method is applied to the field of material preparing.

The invention provides a preparation method of a hard carbon negative electrode material. The preparation method comprises steps as follows: aggregates and asphalt with a softening point being 200-280DEG C are mixed and kneaded at 300-380 DEG C, and a mixed material is obtained; the mixed material is subjected to molding and then is carbonized at 400-500 DEG C, and a precursor is obtained; the precursor is crushed and carbonized at 900-1400 DEG C, and the hard carbon negative electrode material is obtained. Compared with the prior art, the preparation method has the beneficial effects as follows: air and asphalt can be sufficiently and uniformly mixed in a mixing and kneading pot, a uniform cross-linking reaction is performed, oxygen-containing functional groups on the surface of asphaltare increased through oxidizing modification, and superior conditions are created for production of a large quantity of uniform lithium storage holes based on carbonization.

The invention discloses a high-volume V2O5 film anode material for a lithium ion battery. A preparation method of the high-volume V2O5 film anode material for a lithium ion battery comprises the following steps of 1, preparing V2O5 sol by mixing V2O5 powder and H2O2 with stirring, 2, preparing sol having different concentrations by preparing the V2O5 sol into the sol respectively having concentrations of 0.002-0.016mol / L, 3, pre-treating a Pt substrate by immersing the Pt substrate in hydrogen peroxide for 10 min, flushing by deionized water and naturally drying in air, and 4, preparing a V2O5 film electrode by taking 10 microliters of the V2O5 sol having the required concentration, laying the V2O5 sol on the Pt substrate, naturally drying in air, putting the Pt substrate with the dried V2O5 sol into a muffle furnace having a temperature of 500 DEG C, carrying out calcination for 2 hours, and naturally cooling to a room temperature to obtain a V2O5 film electrode. The high-volume V2O5 film anode material for a lithium ion battery has a special microstructure and can improve a specific capacity of a lithium ion battery.

The invention relates to a power lithium-ion battery negative electrode material with a core-shell structure of an electric automobile and a preparation method thereof. The power lithium-ion battery negative electrode material comprises a graphite core and a shell, wherein the shell has a single-layer structure or a double-layer structure and is formed by one cladding or two cladding through a solid-phase cladding method; the shell with the single-layer structure is a hard-carbon and soft-carbon mixed carbide layer; the shell with the double-layer structure consists of an inner layer and an outer layer, the inner layer is a hard-carbon and soft-carbon mixed carbide layer, and the outer layer is a pure soft carbon carbide layer. The shell is prepared by the following steps: uniformly mixing and cladding the crushed hard-carbon and soft-carbon mixed coatings and isotropic graphite in a conical mixer, performing carbonization in an inert atmosphere, cooling, crushing and screening to obtain the shell formed by one cladding or a shell formed by two cladding. The compatibility of the graphite negative electrode material on an electrolyte solution is enhanced, and the problems that a lithium ion battery is poor in rate charge and discharge performance in high / low-temperature environments and a graphite structure is easily damaged in a charge and discharge process are solved.

The invention discloses a preparation method of a coal pitch-based lithium ion battery negative electrode material. Pitch balls with a diameter of less than 100 μm and a softening point of 90° C. to 130° C. are added with a sulfonating agent to be sulfonated at room temperature, and then sulfonated at a temperature of 400 to 500° C. The sulfonating agent is decomposed at ℃, the asphalt balls from which the sulfonating agent has been removed are placed in the reaction vessel, and air-oxidized at 280-350 ℃. Hard carbon anode materials with different median diameters were obtained. The invention has the advantages of high yield, simple process, convenient operation and very low cost compared with mesophase carbon microspheres.

The invention discloses a silicon-containing porous amorphous alloy negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the field of electrochemical power sources. The negative electrode material mainly comprises 10 to 60 at% of Si, 10 to 35 at% of B and 0 to 55 at% of Fe, with the balance being other elements. The preparation method comprises the following steps: adding Si-containing Fe-based amorphous alloy (an amorphous nanocrystal composite material) into dilute hydrochloric acid for corrosion so as to remove Fe; and then successively carrying out standing, pumping filtration, washing, drying, ultrasonic crushing and sieving so as to obtain the silicon-containing porous amorphous alloy material. The preparation method which prepares the silicon-containing porous amorphous alloy material by using a chemical corrosion method has the advantages of simple preparation process and low cost; and the prepared silicon-containing porous amorphous alloy material has excellent electrochemical properties like high specific capacity and a stable discharge platform when used as the negative electrode material for the lithium ion battery, and has good application prospects.

The invention discloses a graphene composite transition metal oxide nanofiber lithium ion battery electrode material and a preparation method thereof. The composite electrode material combines a function of a graphene laminated structure for embedding and binding transition metal oxide nanoparticles, a function of a micropore tunnel structure interconnected in graphene composite transition metal oxide nanofiber for quickly embedding and taking off lithium ions and a function of three-dimensional space structures wound with each other among nanofibers and used for effectively releasing greatly-changed stress when the volume in an electrode membrane is expanded or contracted. Due to the integration of the three functions, the volume effect of the transition metal oxide material in the process of embedding / taking off the lithium ions can be effectively restrained and buffered, the loss of the irreversible capacity can be reduced, and then, the capacity and the cycling stability performance of a lithium ion battery are further improved.

The invention relates to the field of electrochemical energy storage devices, in particular to a novel lithium ion carbon-based super capacitor. The lithium ion carbon-based super capacitor is composed of a shell, a positive electrode slice, a negative electrode slice, a diaphragm located between the positive electrode slice and the negative electrode slice and organic electrolyte. The lithium ion carbon-based super capacitor is characterized in that the positive electrode slice is mainly formed by pressing activated carbon and a single conductive agent and bonding agent mixing face on a current collector; the negative electrode slice is mainly formed by coating copper foil with graphite and a single conductive agent and bonding agent mixing face; the organic electrolyte is composed of electrolyte salt containing lithium ions and a mixed organic solvent, and a lithium slice and a diaphragm are further arranged between the shell and the negative electrode slice. The super capacitor has the advantages that compared with an existing lithium ion battery, the product is higher in power density, longer in service life and better is safety performance.

The invention discloses an alumina-modified graphene lithium ion battery anode material and a preparation method thereof, which belong to the technical field of lithium ion battery anode materials. The alumina-modified graphene lithium ion battery anode material consists of the following raw materials: nano-silicon powder, carbon fibers, graphene, carbon nanotubes, ethylene carbonate, alumina andpolyacrylic acid; and the lithium ion battery anode material is prepared by steps such as ultrasonic treatment, magnetic stirring, microwave treatment and high-temperature calcination. According to the invention, by means of a reinforcing system composed of ethylene carbonate, alumina and polyacrylic acid, the lithium intercalation capacity, lithium deintercalation capacity, initial coulombic efficiency and cycle performance of the alumina-modified graphene lithium ion battery anode material are increased.

The invention discloses a slurry blending process of a composite graphite cathode of a lithium ion battery. The slurry blending process comprises the following steps: adding an additive into deionizedwater, stirring until dissolving, so as to obtain an additive solution; adding a thickening agent into the additive solution so as to prepare a glue solution, and equally dividing the glue solution into two parts for later use; adding a conducting agent and composite graphite into one half of the glue solution, and carrying out dry blending, so as to obtain slurry 1; adding the other half of theglue solution into the slurry 1, carrying out high-speed dispersion, so as to obtain slurry 2; and adding an adhesive into the slurry 2, uniformly dispersing so as to obtain slurry 3, adjusting the viscosity of the slurry 3 within a process range, and discharging. The primary efficiency of the lithium ion battery prepared by virtue of the slurry blending process of the cathode is improved, graphite does not settle in the slurry blending process, the performance of the battery is improved, and the service life of the battery is prolonged.