76results about How to "Excellent high magnification performance" patented technology

The invention relates to a preparation method of lithium titanate-graphene combination electrode material, belonging to the field of electrochemical power source; in the invention, the lithium titanate and graphite oxide are mixed and are prepared into titanate-graphene combination electrode material by heating under inert atmosphere; in the synthesized lithium titanate-graphene combination electrode material, metallic lithium is used as the cathode for preparing a battery, and the first charging and discharging capacity exceeds 186mAh/g when 10C charging and discharging is carried out; after 100 circles of the charging and discharging are carried out, the discharging capacity is higher than 116mAh/g. the method in the invention has low cost, and simple and flexible preparation procedures, and is suitable for industrial large-scale production. High multiplying power of the prepared titanate-graphene combination electrode material has good performance, and the combination electrode material has high specific capacity and can be widely applied to lithium ion batteries of various kinds of potable electronic equipment and various electric motors.

The invention discloses a sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode and a production method thereof, and belongs to the field of material synthesis. The chemical formula of a lithium-rich manganese base positive electrode material is aLi2MnO3.(1-a)LiMO2, and the chemical formula of a spinel material is LiMn2-xMxO4, wherein x is not less than 0.1 and is less than 1, M = Mn1-x-yNixCoy, x is not less than 0 and not more than 0.5, and y is not less than 0 and not more than 0.5. The production method comprises the following steps: carrying out a coprecipitation technology to obtain a manganese nickel cobalt carbonate spherical precursor, uniformly mixing the precursor with a lithium salt compound, calcining the obtained mixture to obtain the spherical lithium-rich manganese base positive electrode material, mixing the positive electrode material with a graphene oxide dispersion, carrying out a vacuum suction filtration technology to produce a sandwich structured lithium-rich manganese base and graphene oxide composite film, and carrying out high-temperature in-situ carbothermal reduction to produce the sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode. The production method has the advantages of simple process and low production cost; and the sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode has the advantages of obviously improved and reliable performances, large specific capacity, excellent rate and excellent cycle performances.

The invention discloses a method of preparing a g-C3N4/silicon carbon cathode material of a lithium ion battery by electrostatic spinning and an application thereof. The method comprises the followingsteps: (1) adding polyvinylpyrrolidone into N,N-dimethylformamide to obtain a polyvinylpyrrolidone solution; (2) adding nano silicon into the polyvinylpyrrolidone solution to obtain a mixed solutionA; (3) adding urea into the mixed solution A to obtain a mixed solution B; (4) carrying out electrostatic spinning on the mixed solution B to obtain a silicon polymer composite material; and (5) putting the silicon polymer composite material in an inert gas environment, heating the material to 200-400 DEG C, keeping the temperature constantly for 3-6 hours, and heating the material to 500-700 DEGC and keeping the temperature constantly for 3-6 hours to obtain the g-C3N4/silicon carbon cathode material of the lithium ion battery. The g-C3N4/silicon carbon cathode material of the lithium ion battery has the advantages of being high in specific capacity, stable to recycle, good in rate performance and the like.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a hollow-structure carbon and silicon negative pole material used for a lithium ion battery. The inner side of the negative pole material is of a hollow structure, and a wall layer of the negative pole material comprises an inner wall and an outer wall; the inner wall is subjected to homogeneous phase compounding by nanometer silicon and a low carbon residue carbon source; the outer wall is a carbon coating layer formed by an original pyrolysis carbon source; the particle size of the nanometer silicon is 5-300nm; the softening point of the low carbon residue carbon source is less than 200DEG C, and a carbon residue rate is less than 40%; the thickness of the outer wall is 0.1-10 microns; thethickness of the inner wall is 1-8 microns. The invention designs the large hollow-structure carbon and silicon negative pole material used for the lithium ion battery, a large hollow part is reservedfor the volume expansion of silicon, the volume expansion problem of a silicon negative pole can be obviously solved, the formation of the large hollow structure is guaranteed by the low carbon residue carbon source, meanwhile, the nanometer silicon is subjected to homogeneous phase dispersion, a transmission channel and rate of electrons and lithium ions can be guaranteed, and the carbon coatinglayer coats the outmost layer so as to form a protection shell for isolating electrolyte.

The invention relates to a novel energy storage device and a preparation method of a spinel lithium titanate/carbon composite material of a lithium-ion battery cathode material with long service life and high power. The lithium titanate/carbon composite material is prepared by adopting a sol-gel method and taking inorganic lithium salts and tetrabutyl titanate as materials and carbon black as a carbon source. The prepared lithium titanate/carbon composite material has small particles and even particle size distribution and shows excellent large-rate capability and cycling performance as the cathode of a lithium-ion battery with long service life and high power. When the lithium titanate/carbon composite material and metallic lithium form a half-cell, the first specific capacity of the half-cell can still reach 108.9mAh/g in the 60C discharging process, and the capacity retention ratio of the half-cell after 2000 cycles is 75.9 percent. When the lithium titanate/carbon composite material and spinel lithium manganite form the lithium-ion battery and the current density reaches 1A/g (about 60C multiplying power), the discharge capacity can still reach 85 percent of discharge capacity when the current density reaches 60mA/g. Therefore, the invention has wide application potential in the lithium-ion battery with long service life and high power.

The invention discloses a double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof. A CVD deposition method is used for depositing nano silicon on that graphite particle to obtain a precursor of a negative electrode material; The titanium dioxide, the lithium carbonate and the organic pyrolysis carbon source are dispersed in an organic solvent to prepare a gel; the precursor of anode material was added into the gel, and the core-shell structure anode material was prepared by low temperature treatment, homogeneous dispersion and high temperature reaction. The core of double-layer coated core-shell negative electrode material for the lithium ion battery is nano silicon and graphite, the nano silicon is deposited on the surface of graphite particles, the outer shell is an organic pyrolytic carbon layer, and the inner shell is formed by attaching lithium titanate to the inner wall of the organic pyrolytic carbon layer. The core-shell negative electrode material has high capacity, high rate and excellent cycling performance, and the preparation process is simple, green and pollution-free, suitable for large-scale production.

The invention discloses a cobalt nickel manganese lithium oxide-cooper oxide compound positive material for a lithium ion battery and a preparation method thereof. The compound positive material is obtained by coating cooper oxide on the surface of cobalt nickel manganese lithium oxide; and the chemical general formula of the compound positive material is LiCoxNiMn(1-x-y)O2/CuO, wherein x is large than or equal to 0.2 and less than or equal to 0.4, and y is more than or equal to 0.3 and less than or equal to 0.7. The preparation method comprises the following steps: preparing cobalt nickel manganese lithium oxide ternary compound oxide lithium salt by a high temperature solid method; and then coating the copper oxide on the surface of the cobalt nickel manganese lithium oxide through high-temperature sintering so as to obtain the cobalt nickel manganese lithium oxide-cooper oxide compound positive material for the lithium ion battery. The material provided by the invention has the advantages of high specific capacity, good circulation characteristic, short production period and the like, is suitable for industrial production, and can be applied to the fields of electromobiles, energy storing equipment, electric power tools and the like.

The invention relates to a carbon-supported porous spherical MoN lithium battery negative material formed by nanosheets. A preparation method of the material comprises the following steps: adding 0.1gof MoO2(acac)2, 0.2g of CH4N2S and 0.1g of glucose into 20ml of H2O and stirring for 1h, then placing in an oven at 200 DEG C for 12h, then taking out, centrifuging the product when the product is cooled to the room temperature, washing with ethanol and deionized water for a plurality of times, and placing in the oven at 70 DEG C to obtain a precursor of MoN; then, placing the obtained precursorin a tube furnace, and calcining for 4h at 800 DEG C in an ammonia atmosphere to obtain the carbon-supported porous spherical MoN material formed by the nanosheets. The prepared spherical MoN nanosheets having sizes of 500nm have good cycle stability and high rate performance as negative electrodes of lithium ion batteries, and has a specific capacity of 600mAh/g after 400 cycles of charge and discharge when the current density is 1A.

The invention relates to a lithium ion battery, more particularly to a power lithium ion battery. The inventive power lithium ion battery comprises an anode, a cathode, and a membrane between the anode and the cathode and organic electrolyte, wherein, the active material of the anode is nanometer LiFePO4/C which accounts for 85-95% (by mass) of the mixed powders of the anode; the active material of the cathode is nanometer Li4Ti5O12/C which accounts for 85-95% (by mass) of the mixed powders of the cathode; the organic electrolyte takes LiPF6 as an electrolyte and takes EC and DEC as solvents. Compared with the existing lithium ion battery which serves as the power source of electric vehicle, the inventive power lithium ion battery is good in conductivity, high in safety, stable in discharging, long in cycle life and excellent in high-current charging and discharging; the invention is extremely suitable for the power source of the electric vehicle.

A preparation method of a composite lithium iron phosphate material relates to a lithium ion battery cathode material. The method comprises the following steps: feeding main raw materials of Fe(NO)3, LiH2PO4, oxide doped with metal ions, and a polymer organic carbon source into an autoclave according to a stoichiometric ratio, adding water and argon to allow the raw materials to react and to be mixed well so as to obtain a slurry; cooling the slurry, drying and sieving; sintering the materials in argon atmosphere to obtain primary sintered materials; sieving the primary sintered materials, continuing to sinter the materials in argon atmosphere, cooling to obtain a composite lithium iron phosphate material. The prepared composite lithium iron phosphate material has high conductivity and excellent electrochemical performance, and the process is stable and simple, is easy for industrial production.

The invention discloses a B and N co-doped graphene coated silicon nano negative electrode material and a preparation method thereof. The negative electrode material is prepared from B and N co-dopedgraphene coated silicon nano particles. The preparation method comprises the following steps: (1) adding graphene oxide powder into water, and carrying out ultrasonic dispersion to obtain a graphene oxide aqueous dispersion; (2) adding silicon nanoparticles and a nitrogen source into the graphene oxide aqueous dispersion, carrying out primary ultrasonic dispersion, adding a boron source, carryingout secondary ultrasonic dispersion, and carrying out freeze drying to obtain a B and N-containing graphene oxide coated silicon nano composite material; and (3) in an inert atmosphere, carrying out heat treatment on the B and N-containing graphene oxide coated silicon nano composite material, washing with water, and drying to obtain the material. The battery assembled by the negative electrode material well solves the problem that the volume of the silicon negative electrode material is sharply expanded in the charging and discharging process and is good in cycle performance and high-rate electrochemical performance and low in cost; and the method is simple in process and suitable for industrial production.

The invention provides an amorphous carbon negative electrode material as well as a preparation method and application thereof. The amorphous carbon negative electrode material comprises a foam type carbon skeleton and carbon particles embedded in the foam type carbon skeleton, wherein the surface of the amorphous carbon negative electrode material comprises macropores and ultramicropores. The preparation method comprises the following steps: (1) subjecting carbon particles to reacting with an organic complex so as to obtain sol; (2) adding a curing and expanding agent into the sol, and conducting reacting to obtain a composite material; and (3) sintering the composite material to obtain the amorphous carbon negative electrode material. The material has a concave-convex structure similar to the surface of a lotus leaf, and the special structure can resist adsorption and provide a rapid diffusion channel for reaction ions, and shows excellent high-rate long-cycle performance in energy storage application.

The invention relates to the technical field of functional material application and preparation and particularly relates to a method for preparing a porous carbon through a zeolite template. The method for preparing the porous carbon through the zeolite template comprises the following steps: preparing a carbon/template compound from the zeolite; and preparing the porous carbon from the carbon/template compound. A mesopore and macropore template carbon with wide pore size distribution can be prepared by taking a natural zeolite as the template. The specific surface area of the template carbon is 411m<2>/g, and the mesopore rate is 66%. In the H2SO4 medium, the template carbon has excellent high-rate capability. When the scanning speed is 1mV/s, the specific capacity is 185F/g; when the scanning speed is increased to 500mV/s, the specific capacity is 133F/g, and the capacity retention ratio is 72%, and a good scanning curve can be kept.

The invention discloses a preparation method for improving the potential of a lithium ion battery positive electrode material LiCoO2. The method comprises the following steps: mixing cobaltosic oxide with a lithium salt, adding an additive T1, preprocessing above mixed materials, carrying out high-temperature primary sintering on the above obtained preprocessed uniformly-mixed materials, carrying out surface treatment on the obtained sintered material, carrying out secondary mixing after the treatment ends, preprocessing the secondary mixed material, carrying out low-temperature secondary sintering, and carrying out surface treatment to obtain a product. Lithium cobaltate produced through the preparation method for improving the potential of the lithium ion battery positive electrode material has original properties, and also realize 4.4 v charge and discharge; the material is processed to form a final battery undergoing test, the test current rate is 0.2 C, the discharge voltage range is 3.0-4.35 V, the specific capacity of the tested material is greater than 160 mAh/g, and the capacity retention ratio is 99.5% or above after cycling 1 C charge/1 C discharge 10 times; and the preparation method has good economic and social benefits, and is suitable for being promoted and used.

The invention provides a composite lithium oxide film and a preparation method and an application thereof. The preparation method of the composite lithium oxide film comprises the step of performing co-sputtering treatment on a lithium oxide target material and an energy density contribution main element target material in an inert atmosphere so as to grow a composite lithium oxide film on a substrate. According to the preparation method of the composite lithium oxide film, the lithium oxide target material and the energy density contribution main element target material are directly depositedby adopting the co-sputtering method. The grown composite lithium oxide film is enabled to have the characteristic of low interfacial resistance. In addition, the generation of a solid electrolyte interface (SEI) film can be reduced, the stress of periodic volume change is relieved, and the structural stability of lithium ions in the embedding/disembedding process is maintained. Furthermore, thepreparation method effectively ensures that the grown composite lithium oxide film is stable in chemical performance.

The invention relates to the technical field of application and preparation of functional materials, in particular to a method of using a zeolite template to prepare porous carbon, comprising the steps of preparing a carbon/template composite with zeolite; preparing porous carbon with the prepared carbon/template composite. A template is made with natural zeolite to prepare medium- and large-poretemplate carbon with wide particle size distribution. The template carbon has specific surface area of 41 lm<2>/g and medium-pore rate of 66%; in H2SO4 medium, the template carbon has good high-rate performance; in case of scanning speed of 1 mV/s, the template carbon has specific capacity of 185 F/g; when the scanning speed is increased to 500 mV/s, the specific capacity is still 133 F/g, the capacity retention ratio is 72%, and a good scanning curve is maintained.

The invention discloses a double-ion battery based on molybdenum selenide-graphite and a preparation method of the double-ion battery. The gel containing phosphomolybdic acid is obtained through a simple sol-gel method. The preparation method comprises steps of calcining to synthesize the molybdenum selenide/nitrogen-doped carbon (MoSe2/NC) compound, and designing the molybdenum selenide-graphite-based dual-ion battery by taking the MoSe2/NC compound as a negative electrode material of the dual-ion battery and taking graphite as a positive electrode material. The method is advantaged in that the battery designed by the method is low in cost, the working voltage range of the assembled dual-ion battery is as high as 2-5V, and the assembled dual-ion battery is good in cycling stability, relatively high in reversible capacity and good in high-rate performance, the capacity is 86 mA h/g after 100 times of circulation under 2C multiplying power, and the 76 mA h/g reversible capacity can still be provided after circulation under 20 C super-large multiplying power.