35results about How to "Lower specific capacity" patented technology

A sulfide polymer coated sulfur / carbon composite material and a preparation method thereof. The composite material includes composite containing carbon with high surface area and sulfur and a sulfide polymer cladding layer. The preparation method is as below: conducting ball-milling on sulfur and carbon with high surface area in a ball mill and conducting heat treatment on the product under protective atmosphere; dispersing the product in a solution containing polymer monomers and adding a initiator to initiate polymerization; filtering, washing and drying; and conducting heat treatment on the product under protective atmosphere, so as to obtain the sulfide polymer coated sulfur / carbon composite material. The composite material provided by the invention as an anode material for lithium sulfur battery has the following advantages: high surface area carbon material can improve the electronic conductivity of sulfur, and inhibit polysulfide erosion; the sulfide polymer coating layer not only inhibits the loss of polysulfide but also provides part of the capacity. Lithium sulfur battery composed of the composite material has the advantages of high specific capacity, long service life, high rate capability, simple preparation and low cost, and has good application prospect.

The invention provides a preparation method of a porous oxide-coated battery silicon anode material and relates to the technical field of preparation of lithium ion battery anode materials. The preparation method provided by the invention comprises the following steps: performing silicon anode material drying treatment; performing surface passivation treatment on a silicon anode material with ethyl alcohol; performing set cyclic cycle deposition in a gas-phase atomic layer deposition chamber to obtain the porous oxide-coated battery silicon anode material. The preparation method provided by the invention is simple and good in repeatability; the prepared lithium ion battery silicon anode material not only has large specific capacity, but also can inhibit the expansion of the silicon anode material in the charting and the discharging processes of a lithium ion battery, so that the lithium ion battery silicon anode material has good charging and discharging cycle performance.

The invention discloses a silicon-based cathode composite material for a lithium ion battery and a preparation method thereof. The cathode composite material is a Si / CuOx / C composite material (0<=x<=1) with a porous structure. Silicon with a porous structure is used as a base, and CuOx particles are inserted in the pores, and carbons with different forms are distributed on a surface and pore walls of the silicon-based material. The preparation method of the cathode composite material comprises steps that silicon material realizes pore-forming through an in situ catalytic reaction between silicon and halogenated hydrocarbon, and reaction condition parameters are regulated to control pore size, distribution and amount of porosity of the silicon material; a post-modification technology is employed to carry out modifications on the surface and the pore walls of the porous silicon, so as to obtain the Si / CuOx / C composite material with a porous structure. The porous silicon-based cathode composite material has low production costs, simple process and no pollution, and is suitable for industrialized production; besides the porous silicon-based cathode composite material has high charge and discharge capacity, small initial irreversible capacity and good cycle performance.

The invention discloses a method of preparing nickel-manganese spinel cathode material through magnetic field texturing, which includes steps of: 1) performing coprecipitation to nickel salt and manganese salt to prepare a Ni-Mn precursor; 2) uniformly mixing the Ni-Mn precursor with a lithium source, and calcining the mixture to prepare a nickel-manganese spinel material; 3) crushing and sievingthe nickel-manganese spinel material and stirring and mixing the nickel-manganese spinel material with an additive in a stirrer, and during the stirring, applying an external magnetic field to the slurry. By means of interaction between Mn<3+> and the magnetic field, texturing is achieved in the magnetic field, so that the cathode slurry can face to the contact direction of an electrolyte with (111) crystal face as most as possible when coating an aluminum foil, thereby solving the problems of capacity degradation and poor high temperature cycle performance during charge / discharge process of the nickel-manganese spinel material; in the invention, when being used for assembling a battery, a cathode plate has excellent cycle and rate performance, is high in energy density, and has excellentapplication prospect in the fields such as power cars, large-size power plants and the like.

The invention relates to a carbon fluoride composite positive active material for a lithium-carbon fluoride battery as well as a preparation method and application of the carbon fluoride composite positive active material. The invention aims to solve the technical problem that it is difficult for an existing carbon fluoride composite positive electrode active material for the lithium-carbon fluoride battery to simultaneously consider high specific capacity, high rate capability and improvement of voltage hysteresis phenomenon. The material is prepared by ball-milling and mixing carbon fluoride and ketjen black, and the mixing mass ratio of the carbon fluoride to the ketjen black is (1: 0.01)-(1: 0.1). The preparation method comprises the following steps: 1) preparing carbon fluoride by adopting a gas phase fluorination method; and 2) mixing the carbon fluoride and the ketjen black through ball milling to obtain the uniformly mixed carbon fluoride composite material mixed with the ketjen black. When the carbon fluoride composite positive electrode active material is applied to the carbon fluoride composite positive electrode active material for the lithium-carbon fluoride battery, relatively high specific capacity can be reserved, the rate capability can be improved, the discharge rate can reach 6C, and the voltage hysteresis phenomenon at the initial stage of discharge can be improved.

The invention discloses a preparation method of an Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material. The method is characterized by, accurately weighing an aluminium source, a manganese source, a nickel source and a lithium source according to stoichiometric ratio; mixing the weighed manganese source, the nickel source and Al2O3 and carrying out ball milling; drying the mixture obtained after ball milling into powders; weighing oxalic acid powders and mixing the oxalic acid powders with the mixture dried into powders; adding PEG into the obtained mixture, carryingout stirring to obtain grey-black colloidal mixture, and preheating the grey-black colloidal mixture to obtain black precursor powders; mixing and ball milling the obtained black precursor powders and the weighed lithium source; and keeping the obtained mixture for 5-24 h under the temperature of 800 DEG C, and then, reducing the temperature to less than 600 DEG C and keeping the mixture for 5-24h and then, carrying out annealing to reach room temperature to obtain a submicron-level Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material. The method obtains the Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material by combining a low-cost high-temperature solid phase method and a polymer auxiliary method; and the material is high in cost performance.

The invention provides a preparation method for a low-internal-resistance and high-specific-energy graphene-based button type supercapacitor. The preparation method is characterized in that the low-internal-resistance and high-specific-energy graphene-based button type supercapacitor is prepared by the procedures of preparation of an electrode, preparation of a conductive glue solution, preparation of the button type supercapacitor and the like. By adding graphene, the preparation of the low-internal-resistance and high-specific-energy graphene-based button type supercapacitor is realized and the preparation process of the supercapacitor is lowered; by adding graphene to the electrode and the conductive glue in a powder state and in a liquid state, an adverse phenomenon of graphene agglomeration is avoided consequently; meanwhile, by introducing the high-conductivity and high-purity graphene material to the preparation process of the button type supercapacitor, the specific capacity of the supercapacitor is improved, and the internal resistance value of the supercapacitor is also lowered; and in addition, water content is not added in the electrode preparation process, so that internal electrode corrosion and generation of gas of the supercapacitor can be avoided.

The invention discloses a preparation method of an Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material. The method is characterized by, accurately weighing an aluminium source, a manganese source, a nickel source and a lithium source according to stoichiometric ratio; mixing the weighed manganese source, the nickel source and Al2O3 and carrying out ball milling; drying the mixture obtained after ball milling into powders; weighing oxalic acid powders and mixing the oxalic acid powders with the mixture dried into powders; adding PEG into the obtained mixture, carryingout stirring to obtain grey-black colloidal mixture, and preheating the grey-black colloidal mixture to obtain black precursor powders; mixing and ball milling the obtained black precursor powders and the weighed lithium source; and keeping the obtained mixture for 5-24 h under the temperature of 800 DEG C, and then, reducing the temperature to less than 600 DEG C and keeping the mixture for 5-24h and then, carrying out annealing to reach room temperature to obtain a submicron-level Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material. The method obtains the Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material by combining a low-cost high-temperature solid phase method and a polymer auxiliary method; and the material is high in cost performance.

The invention discloses a preparation method of a nickel iron sulfide / foam nickel nano composite electrode material, The nickel-iron sulfide was prepared by calcination method combined with alcoholicheat method. The nickel-iron sulfide was directly grown on the surface of nickel foam, the material does not need processing and can be used as that electrode material of the supercapacitor directly,The invention can overcome the shortcomings of easily falling off active material and increasing electrode impedance in the process of electrochemical cycle of electrode material, and innovatively combines cobalt-nickel sulfide nanostructure and foam nickel to construct three-dimensional hollow interconnected nanostructure, increases ion nanochannels, and effectively improves the comprehensive capacitance performance of electrode material.

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 CNTs (carbon nanotubes)-doped tin oxide negative electrode material for a lithium-ion battery and a preparation method thereof. The preparation method comprises the following steps: firstly, compositely electroplating a CNTs-doped tin plating layer with the thickness of 10-15 microns on one side of the surface of a substrate of a pretreated copper strip; and secondly, anodizing the material obtained in the first step to obtain a mesoporous oxide, and performing heat treatment to finally obtain the lithium-ion battery negative electrode material with CNTs-uniformly-doped mesoporous tin oxide layer on one side of the surface of the substrate of the copper strip. The mesoporous diameter is 3-10nm and the obtained oxide layer has the thickness of 5-10 microns. The first specific discharge capacity of the lithium-ion battery negative electrode material can be as high as 650mAh / g, and after 50 cycles, the specific capacity is attenuated by only 0.8%-5%. The preparation method is simple in process, and large-scale industrial production can be carried out.

The invention discloses a method of preparing nickel-manganese spinel cathode material through magnetic field texturing, which includes steps of: 1) performing coprecipitation to nickel salt and manganese salt to prepare a Ni-Mn precursor; 2) uniformly mixing the Ni-Mn precursor with a lithium source, and calcining the mixture to prepare a nickel-manganese spinel material; 3) crushing and sievingthe nickel-manganese spinel material and stirring and mixing the nickel-manganese spinel material with an additive in a stirrer, and during the stirring, applying an external magnetic field to the slurry. By means of interaction between Mn<3+> and the magnetic field, texturing is achieved in the magnetic field, so that the cathode slurry can face to the contact direction of an electrolyte with (111) crystal face as most as possible when coating an aluminum foil, thereby solving the problems of capacity degradation and poor high temperature cycle performance during charge / discharge process of the nickel-manganese spinel material; in the invention, when being used for assembling a battery, a cathode plate has excellent cycle and rate performance, is high in energy density, and has excellentapplication prospect in the fields such as power cars, large-size power plants and the like.

The invention relates to a sulfur / nitrogen / silicon co-doped graphite composite negative electrode material and a preparation method thereof, belonging to the technical field of preparation of lithium ion battery materials. The technical solution is: (1) Weigh 1~5g of sulfur-containing organic compound and 1~5g of nitrogen-containing organic compound into 500g of organic solvent, stir evenly, add 100g of graphite into it and stir evenly, after filtering, transfer to the tube type In the furnace, under an inert atmosphere, heat up to 200-500°C and keep it warm for 1-6 hours, then cool down to room temperature in an inert atmosphere to obtain graphite composite material A; into the surface layer of the graphite composite material A, and then carbonized to obtain a sulfur / nitrogen / silicon co-doped graphite composite negative electrode material. The invention improves the specific capacity of the graphite material by doping sulfur in the graphite material, and improves the electrical conductivity of the sulfur through nitrogen doping; the expansion of the material can be reduced and the liquid absorption capacity of the material can be improved.

The invention provides a preparation method for a low-internal-resistance and high-specific-energy graphene-based button type supercapacitor. The preparation method is characterized in that the low-internal-resistance and high-specific-energy graphene-based button type supercapacitor is prepared by the procedures of preparation of an electrode, preparation of a conductive glue solution, preparation of the button type supercapacitor and the like. By adding graphene, the preparation of the low-internal-resistance and high-specific-energy graphene-based button type supercapacitor is realized and the preparation process of the supercapacitor is lowered; by adding graphene to the electrode and the conductive glue in a powder state and in a liquid state, an adverse phenomenon of graphene agglomeration is avoided consequently; meanwhile, by introducing the high-conductivity and high-purity graphene material to the preparation process of the button type supercapacitor, the specific capacity of the supercapacitor is improved, and the internal resistance value of the supercapacitor is also lowered; and in addition, water content is not added in the electrode preparation process, so that internal electrode corrosion and generation of gas of the supercapacitor can be avoided.

The invention provides a preparation method of a porous oxide-coated battery silicon anode material and relates to the technical field of preparation of lithium ion battery anode materials. The preparation method provided by the invention comprises the following steps: performing silicon anode material drying treatment; performing surface passivation treatment on a silicon anode material with ethyl alcohol; performing set cyclic cycle deposition in a gas-phase atomic layer deposition chamber to obtain the porous oxide-coated battery silicon anode material. The preparation method provided by the invention is simple and good in repeatability; the prepared lithium ion battery silicon anode material not only has large specific capacity, but also can inhibit the expansion of the silicon anode material in the charting and the discharging processes of a lithium ion battery, so that the lithium ion battery silicon anode material has good charging and discharging cycle performance.

The invention discloses a method for preparing a sodium ion transition metal oxide positive electrode material. The preparation steps include the following steps: S1, mixing: first, stoichiometrically mix sodium acetate trihydrate, manganese acetate tetrahydrate, nickel acetate tetrahydrate, and acetic acid tetrahydrate Cobalt, magnesium acetate, zinc acetate dihydrate and citric acid were taken out and uniformly dissolved in a certain amount of water, then fully stirred and dissolved, then transferred to a water bath and continued to stir until gelatinous. The sodium ion positive plate prepared by the present invention can effectively weaken the Jahn-Teller effect of Mn3+ ions by doping Zn element inside it, and better improve the structural stability of the positive electrode material in the cycle process, thereby The cycle life and rate performance of the prepared material are effectively improved, and the amount of Zn doping can be further increased to continue to improve the cycle stability of the material. When used, it has excellent cycle performance and rate performance. This kind of positive electrode material can effectively promote sodium ion The practical application of the battery has strong practicability.