51 results about "Electrode material" patented technology

Positive electrode active materials are described that have a very high specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. Some materials of interest have the formula Li_1+xNi_αMn_βCO_γO₂, where x ranges from about 0.05 to about 0.25, α ranges from about 0.1 to about 0.4, β ranges from about 0.4 to about 0.65, and γ ranges from about 0.05 to about 0.3. The materials can be coated with a metal fluoride to improve the performance of the materials especially upon cycling. Also, the coated materials can exhibit a very significant decrease in the irreversible capacity lose upon the first charge and discharge of the cell. Methods for producing these materials include, for example, a co-precipitation approach involving metal hydroxides and sol-gel approaches.

A process for producing a spherical carbon material, comprising: subjecting a spherical vinyl resin to an oxidation treatment in an oxidizing gas atmosphere to obtain a spherical carbon precursor, and carbonizing the spherical carbon precursor at 1000-2000° C. in a non-oxidizing gas atmosphere. The thus-obtained spherical carbon material exhibits excellent performances, including high output performance and durability, when used, e.g., as a negative electrode material for non-aqueous electrolyte secondary batteries.

The invention discloses an alumina coating method of a lithium ion battery positive electrode material. The method comprises the following steps: adding ammonia water to a positive electrode material suspended aluminum nitrate solution in a dropwise manner to form a precipitate coated by Al(OH)3, and heating the precipitate in an air atmosphere muffle furnace to form an alumina coated positive electrode material. The coating method can improve the charge and discharge capacity of the lithium ion battery and prolong the cycle life.

The invention relates to a lithium silicate-coated Ni-Co lithium aluminate positive electrode material and a preparation method thereof. The mass percent of lithium silicate in the material accounts for 1-10wt%, a coating layer with a thickness being 2-20 nanometers is formed from the silicon silicate and is coated on Ni-Co lithium aluminate, and the positive electrode material is a spherical particle with a grain size being 5-15 micrometers. The method comprises the following steps of (1) adding a silicon source into an organic solvent, performing uniform stirring, adding water, adding Co-Alnickel hydroxide, performing heating and stirring reaction, and performing drying to obtain silicon dioxide-coated Co-Al nickel hydroxide precursor powder; and (2) grinding and uniformly mixing the silicon dioxide-coated Co-Al nickel hydroxide precursor powder and a lithium salt, placing the mixture in a tubular furnace, and performing two-segment calcination under an oxidization atmosphere, thereby obtaining the lithium silicate-coated Ni-Co lithium aluminate positive electrode material. The positive electrode has relatively good cycle stability and large-rate discharging performance; and bythe method, the problem of lithium resided on a surface during conventional coating can be effectively reduced, and the method is low in cost and simple in process and is suitable for industrial production.

A discharge surface-treatment method includes generating a pulse-like discharge by using a green compact of metal powder, a metal compound powder, or a ceramic powder as an electrode and applying a voltage equal to or greater than 500 volts between the electrode and a workpiece in a gas atmosphere; and forming a coating consisting of an electrode material or a substance resulting from a reaction of the electrode material to the energy of the pulse-like discharge on a surface of the workpiece with an energy of the pulse-like discharge.

The invention provides a preparation method of a radial structure spherical NCM811 type ternary positive electrode material. The preparation method comprises the following steps: preparing a nickel salt, cobalt salt and manganese salt solution used as a solution 1, wherein a molar ratio of Ni:Co:Mn is 8:1:1; taking a precipitant, and preparing a solution 2; taking a complexing agent, and preparinga solution 3; adding the complexing agent solution into a reaction kettle as a base solution; adding the solution 1, the solution 2, and the solution 3 into the reaction kettle, introducing an inertgas to carry out protection, controlling the total ammonia concentration of the reaction system to be 0.5-1.5 mol/L, and performing aging under a pH value of 11.3-11.7 at a temperature of 45-55 DEG Cfor 5-15 h; washing the obtained reaction product, performing suction filtration, and drying the reaction product to prepare a precursor; grinding and uniformly mixing the precursor and a lithium saltwhich are used as raw materials; placing and sintering the obtained mixture in a muffle furnace in an oxygen atmosphere, wherein the sintering process comprises sintering at 400-500 DEG C for 4-8 h,and sintering at 700-780 DEG C for 10-15 h; and cooling the sintered mixture to room temperature to prepare the positive electrode material. The material obtained by the invention has the advantages of stable structure, excellent electrochemical performances, and reduction of the industrialization cost.

The invention belongs to the technical field of new energy materials, in particular to an all-solid-state lithium ion battery and an integrated composite sintering preparation process thereof. The all-solid-state lithium ion battery comprises at least one electrode-electrolyte composite electrode sheet. The electrode of the electrode-electrolyte composite electrode sheet is made of lithium oxide positive electrode or oxide negative electrode material, and the electrode is a solid oxide electrolyte. The interface problem of the all-solid-state lithium battery can be effectively improved and theinterface bonding degree and the interface structure stability between the electrode and the solid electrolyte can be remarkably enhanced so that the single cell has higher density and energy densityand also has very excellent safety performance and is suitable for large-scale production and application.

The invention relates to the technical field of inorganic materials, and discloses a preparation method for a ferrous carbonate/graphene composite material. The preparation method comprises the steps of: I. mixing graphene materials, water-soluble ferrite, urea and water to form a suspension, wherein the mass ratio of the graphene materials to the water-soluble ferrite is (0.02-0.2):1, and the amount-of-substance concentration ratio of the urea to the water-soluble ferrite is (20-100):1; II. putting the suspension into a reaction kettle, controlling the temperature to be 100-180DEG C, and carrying out hydrothermal reaction for 4-12h to obtain the ferrous carbonate/graphene composite material. The invention further provides a lithium ion battery prepared by taking the ferrous carbonate/graphene composite material as a negative electrode material. By being synthesized through low-temperature hydrothermal reaction, the ferrous carbonate/graphene composite material is high in specific capacity and good in cycling performance, and has excellent development prospects after being applied to the negative electrode materials of the lithium ion battery.

The invention relates to the field of porous materials, and particularly discloses a high-thermal-conductivity pure porous silicon carbide material, and a preparation method and application thereof. The porous silicon carbide material is constructed by a three-dimensionally connected pure silicon carbide network and a three-dimensionally connected pore network in an interfingering mode, wherein the silicon carbide network is composed of silicon carbide crystal grains connected through grain boundaries to ensure high thermal conductivity of the porous silicon carbide material. By adopting the structure design and preparation method of the high-thermal-conductivity pure porous silicon carbide material, the high-thermal-conductivity pure porous silicon carbide material with adjustable pore size and porosity height can be obtained. The pure porous silicon carbide material is a novel porous material with simple preparation technology and high efficiency, has a wide range of application prospects, and can be used in the following fields such as composite material reinforcements, heat dissipation materials, electromagnetic shielding materials, wave-absorbing materials, filters, biologicalmaterials, catalytic carrier materials, electrode materials, and sound absorbing/noise reducing materials.

The invention belongs to the field of a lithium ion battery material, and discloses a titanium dioxide-copper oxide nano compound and a preparation method and an application thereof. The preparation method comprises the steps of adding nanometer TiO<2> and Cu(Ac)<2>.H<2>O into a solvent, and performing ultrasonic treatment, stirring and mixing uniformly to obtain a turbid liquid; next, dropwise adding stronger ammonia water to adjust PH to be alkali, heating to 85-95 DEG C and reacting for 10-15h, and performing natural cooling after the reaction is completed; and performing washing and dryingon the obtained solid product, and next, performing calcining in the air atmosphere at a temperature of 300-450 DEG C for 3-8h to obtain the titanium dioxide-copper oxide nano compound. The preparation method is simple and easy to implement, and energy-saving and environment friendly; and the obtained TiO<2>-CuO nanometer compound, when used as the negative electrode material of the lithium ion battery, is excellent in electrochemical performance.

The invention relates to a layered lithium-rich manganese oxide positive electrode material suppressing capacity/voltage attenuation during a circulation process effectively and a preparation method therefor and an application thereof. The preparation method of the layered lithium-rich manganese oxide positive electrode material comprises the following steps of: during a preparation process of a precursor of the layered lithium-rich manganese oxide positive electrode material of a lithium ion battery, adding the raw material precursor of LiNiO2; and performing high temperature heat treatment to obtain a layered lithium-rich manganese oxide composite positive electrode material. The Ni element in the layered lithium-rich manganese oxide positive electrode material can effectively suppress the migration of transitional metal elements during the circulation of the layered lithium-rich manganese positive electrode material and suppress the formation of a spinel phase, thereby effectively suppressing the capacity/voltage attenuation during the circulation process. The positive electrode and the lithium ion battery that use the material belong to the technical field of energy materials and energy conversion. The material used as the positive electrode material of the lithium ion battery has the advantages of high energy density, cycling stability, and good rate capability.

In at least one embodiment of the disclosure, a discharge lamp lighting device includes a discharge lamp driving unit that drives a discharge lamp (90) by supplying an AC driving current (I) to the discharge lamp (90). A memory unit (44) is configured to store driving parameters for the AC driving current (I). A control unit (40) is configured to control the discharge lamp driving unit based on the driving parameters stored in the memory unit (44). The driving parameters comprise a range of holding time values, each holding time value representing a time period in which the AC driving currentis to be continuously maintained at a same polarity. Upon a predetermined time condition, the control unit (40) selects one of the holding time values based on a predetermined probability and controls the discharge lamp driving unit based on the selected holding time value.

The invention discloses a method for repairing a ternary positive electrode material with deteriorated performance and the acquired ternary positive electrode material. The material repairing method comprises the steps that a repairing agent is dispersed in an organic solvent; after ultrasonic dispersion, the ternary positive electrode material with deteriorated performance under a state of continuous stirring is added; and the repaired ternary positive electrode material is acquired after filtering and high temperature sintering. The interface of the ternary material can be adjusted by adjusting the amount of the repairing agent and other parameters. At the same time, the repairing agent can react with residual lithium on the surface of the material to form a stable compound, which is beneficial to reducing the residual lithium on the surface of the material and can significantly restore the material performance. According to the invention, the previous technical ideas of preventing performance degradation or deterioration of the ternary positive electrode material of a lithium battery is broken; the material which is degraded and deteriorated is remedially treated; and the problems which are not effectively solved during the preparation, transportation and storage of the ternary positive electrode material are solved.

An electrode material for a secondary battery and a secondary battery are provided. The electrode material for the secondary battery includes tin-manganese-nickel-oxide. The secondary battery includes a cathode, an anode, an electrolyte, and a package structure, wherein the anode includes the electrode material for the secondary battery.

The invention discloses a composite electrode material, a preparation method and a super capacitor. The preparation method of the composite electrode material comprises: after carbon cloth loaded withCo-MOF is calcined, obtaining carbon cloth loaded with Co<3>O<4> nanosheets; and taking the carbon cloth loaded with the Co<3>O<4> nanosheet as a working electrode, and carrying out electrodepositionin an electrolyte to obtain the composite electrode material. The electrolyte comprises aniline and 0.8 to 1.2 M of sulfuric acid, and the electro-deposition time is 10 to 14 minutes. The compositeelectrode material provided by the invention is the composite electrode material in which carbon cloth is loaded with core-shell structure nanosheets, wherein the core is Co<3>O<4> nanosheets, and theshell is made from polyaniline. According to the composite electrode material disclosed by the invention, the Co<3>O<4> nanosheets obtained in preparation and the core-shell structure nanosheets in aproduct uniformly grow on carbon cloth, and collapse is avoided; and the composite electrode material can be directly used as a working electrode, is high in specific capacitance, good in cycling stability and large in specific surface area, and can improve the utilization rate of active substances.

The invention discloses a preparation method of a SnS2 nanosheet loaded graphene-based nano composite material, which comprises the following steps: step 1, dispersing graphene oxide nanosheets in deionized water to prepare a graphene oxide solution; 2, dissolving tin tetrachloride in deionized water, and adding thiourea as a sulfur source and a reducing agent; 3, adding the graphene oxide solution in the step 1 into the solution obtained in the step 2, and carrying out mixing treatment through ultrasonic waves and transferring a mixture of the two solutions subjected to ultrasonic treatment into a hydrothermal reaction kettle for reaction to obtain a precipitate; and 4, centrifuging, washing, drying and grinding the precipitate obtained by the reaction in the step 3 to obtain the graphene nanosheet/tin disulfide composite nanomaterial. The graphene nanosheet/tin disulfide composite nanomaterial prepared by the method has higher capacity and stability when being used as a sodium storage electrode material.

The invention discloses a polypyrrole coated Ni-Co-S nanoneedle array composite material. Nickel acetate, cobalt acetate, urea and thiourea are used as raw materials for preparing an NF/NiCo2S4 nanoneedle array material; polypyrrole is used as a conductive polymer for preparing the polypyrrole coated Ni-Co-S nanoneedle array composite material through an adhesive and a curing agent, wherein the nanoneedle structure has a shell-core structure, the core structure is NiCo2S4, and the shell structure is polypyrrole. A preparation method of the NF/NiCo2O4 nanoneedle array material comprises the following steps: 1) preparing the NF/NiCo2O4 nanoneedle array material; (2) preparing the NF/NiCo2S4 nanoneedle array material; (3) preparing the polypyrrole coated Ni-Co-S nanoneedle array composite material. When the material is applied as a supercapacitor electrode material, the window voltage is 0-0.5 V, and the specific capacitance is 1,800-1,900 F/g when the discharge current density is 1A/g. The nanoneedle array grown on the surface of the foamed nickel carrier is regular and ordered in structure and large in specific surface area, so the electron transmission is facilitated; the coating of the conductive polymer is realized by adopting a direct dripping method, so the electrochemical performance is effectively improved.

The invention belongs to the technical field of waste electrode material recovery, and particularly discloses a combined treatment method of waste lithium ion battery black powder. The method comprises the following steps: putting the waste lithium ion battery black powder into a strong oxidizing acid liquor for oxidation treatment, and then carrying out solid-liquid separation to obtain oxidizedpowder; carrying out granulation treatment on the powder subjected to oxidation treatment to obtain secondary particles; heating the secondary particles to 600-1200 DEG C at the heating speed of 20-50DEG C/min, and carrying out heat preservation roasting under the pressure of 10-500 Pa; carrying out water leaching on the roasted materia,l and then carrying out acid leaching treatment; and mixingthe obtained leaching solution with the oxidation treatment solution obtained in step 1, and recovering a positive electrode material, wherein leaching residues obtained through acid leaching are recycled graphite. According to the technical scheme, the combined treatment of a positive electrode and a negative electrode can be realized, in addition, the graphite material with high electrochemicalactivity, particularly high fast charging stability, can be obtained, and a positive electrode material can be obtained through high-recovery-rate recovery.

The invention relates to a layered bimetallic oxide negative electrode material as well as a preparation method and application thereof, and belongs to a negative electrode material of an all-vanadium redox flow battery. The technical problem to be solved by the invention is to provide the layered bimetallic oxide negative electrode material which is simple to prepare and low in cost. The material takes a carbon-based material as a matrix, layered bimetallic oxide is loaded on the surface, and the layered bimetallic oxide is at least one of a NiFe2O4 spinel material and a NiFe2O4 spinel material with cation vacancies. The prepared electrode material has higher electrocatalytic activity, electrochemical polarization in a flow battery can be reduced, and the working current density of the battery is improved; meanwhile, the service life of the battery under high current density is prolonged, the electrocatalytic activity and reversibility of the redox reaction are improved, the charge transfer resistance is reduced, and the cycle performance and energy efficiency of the flow battery are improved. The preparation method is simple, raw materials are cheap and easy to obtain, and commercial popularization and application value is achieved.

The invention relates to a method for preparing a metatitanic acid doped polyaniline combined electrode nanomaterial for a super capacitor and electrochemical performance analysis for the nanomaterial, belonging to the field of preparation of electrode materials of the super capacitor. In the invention, an in-situ chemical polymerization method is used for preparing the metatitanic acid doped polyaniline combined electrode nanomaterial with a coralliform shape and a uniform dimension to serve as an anode material, activated carbon serves as a cathode material, the anode material and the cathode material are assembled into an asymmetrical super capacitor, and a comprehensive performance analysis test is performed. Results from the embodiment of the invention show that the metatitanic acid doped polyaniline combined electrode nanomaterial has the discharge specific capacitance reaching over 90F/g and the cycle life reaching over 2000 times, the specific capacitance value of the metatitanic acid doped polyaniline combined electrode nanomaterial is always stabilized to be over 90% of an initial value in a cyclic process, and the metatitanic acid doped polyaniline combined electrode nanomaterial has a practical application value.

The invention discloses a method for preparing a micro-mesoporous carbon anode material from an amino acid modified metallic organic framework and application. The method comprises steps of synthesizing the amino acid modified metallic organic framework, pretreating the metallic organic framework material, carrying out a carbonization reaction, and the like, the synthesized metallic organic framework is washed and dried, and high-temperature carbonization treatment is carried out directly, and then a nitrogen doped porous carbon material of a rich micro-mesoporous structure is prepared. Compared with a pure metallic organic framework-based carbon material, the carbon electrode material prepared by using the method has a large specific surface area, a large aperture distribution range and alarge pore volume, and has high activity for electro-catalysis oxygen reduction reactions. Meanwhile, the preparation method is simple and easy to control, gentle in condition, easy in raw material obtaining and good in application prospect.

The invention discloses a porous carbon material prepared by using self-modification of pseudomonas putida and a preparation method and application thereof. Self accumulation PHA of the pseudomonas putida (Pseudomonas putida KT2440, preservation serial number of ATCC No.47054) is regulated and controlled by changing ingredients of a culture medium, and carbonization is carried out by directly adopting thallus collected by centrifugation to prepare the graded porous carbon material without any excitation steps. The germ self-modification derived porous carbon material has a large number of mesopore structures. The porous carbon material is used as an electrode material of a super capacitor, when electric current density is 0.5 A/g, the specific volume of the porous carbon material reaches 298 F/g; and when the electric current density increases by 20 A/g, the specific volume of the porous carbon material maintains by 234 F/g, and good electric capacity and excellent rate performance aredisplayed. The preparation method has the advantages of novelty, simple operation, low manufacturing cost and the like, the prepared material has the characteristics of graded bore diameter, large specific surface area, good electrical conductivity and excellent electrochemical performance, and is an electrode material for the ideal super capacitor or batteries.