47results about How to "Reduced electrochemical performance" patented technology

The invention relates to the field of lithium ion batteries and discloses a laminated lithium ion battery preparation method and a prepared battery. The method comprises the following steps of: laminating negative pieces and positive pieces to obtain a laminated cell body; arranging a diaphragm layer between any one of the positive pieces and any one of the negative pieces in the laminated cell body; fixing the middle of the laminated cell body; naturally arranging the laminated cell body on the top of an arc-shaped bracket; carrying out hot-pressing on the laminated cell body so as to adhere each diaphragm layer in the laminated cell body to the corresponding positive piece and the corresponding negative piece; standing the laminated cell body until the laminated cell body is arc-shaped; arranging the arc-shaped laminated cell body into a cell body pit in an aluminum plastic film shell; covering a top aluminum plastic film layer of the aluminum plastic film shell on the top surface of the arc-shaped laminated cell body; and performing heat-sealing on an aluminum plastic film so as to package the arc-shaped laminated cell body in the aluminum plastic film shell, and thus a laminated lithium ion battery is obtained.

The invention discloses a method and a system for preparing an electrode plate by a dry process, and application. The method comprises the following steps: mixing an electrode active material, a conductive agent and a dry binder to obtain a mixture; carrying out kneading treatment on the mixture through mechanical extrusion so as to carry out preliminary fibration on the dry-method binder to obtain a blocky and/or flocculent pre-fibration product; carrying out crushing treatment on the pre-fibration product so as to obtain a granular material; and carrying out roll forming on the granular material and the current collector so as to form a pole piece film on the surface of the current collector, thereby obtaining the dry electrode plate. The method is simple and feasible, required equipment is simple, the problem that the electrode active material structure is damaged in the material crushing treatment process can be effectively solved, the production efficiency is higher, amplification is easy, the method is more suitable for large-scale mass production of the dry electrode technology, development of the new energy industry is promoted, and the method has wide application prospects.

The invention belongs to the technical field of energy materials, and relates to a preparation method and an application of a carbon cloth-based nickel-cobalt bimetal selenide nano square sheet electrode material. The preparation method comprises the following steps: adding a soluble cobalt salt, a soluble nickel salt, medium-tetra(4-carboxyphenyl)porphin and 4, 4 '-dipyridyl into an N, N-dimethylformamide and ethanol solution, carrying out ultrasonic uniform dispersion, carrying out a hydrothermal reaction with controllable temperature programming together with a carbon cloth substrate, and carrying out cleaning and drying to obtain a carbon cloth-based nickel-cobalt bimetal organic framework nano square sheet precursor; and putting selenium powder and the carbon cloth-based nickel-cobaltmetal organic framework nano square sheet precursor into a tubular furnace, and carrying out selenylation reaction to obtain a carbon cloth-based nickel-cobalt bimetal selenide nano square sheet electrode material. The metal selenide electrode material prepared by the invention has stable morphology, high specific surface area, more active sites, good mechanical stability, high conductivity, excellent electrochemical energy storage performance and electrochemical cycling stability.

The invention provides a method for preparing a manganese dioxide-titanium carbide composite material through a hydrothermal method and the composite material prepared through the method. The method comprises the steps that Ti3C2 nanopowder and dopamine hydrochloride are dispersed in ultrapure water separately, mixed to be uniform and then stirred under the shading condition; a Tris-buffer solution is added, and stirring continues under the shading condition; the obtained mixed solution is separated, washed and dried to obtain Ti3C2@PDA nanopowder; the Ti3C2@PDA nanopowder is added into ultrapure water and dispersed to be uniform, and then KMnO4 is added for a hydrothermal reaction; and after the reaction ends, natural cooling is conducted, and then the manganese dioxide-titanium carbide composite material can be obtained. According to the method, uniformly-distributed manganese dioxide can be formed on the surface of titanium carbide, the obtained composite material is good in electrochemical performance, and the preparation method is low in requirement on equipment, easy and convenient to operate, low in cost and beneficial to achievement of industrialized mass production.

The invention discloses a preparation method of a diaphragm, electrode and current collector integrated structure as well as a preparation method of a battery. The preparation method of the integratedstructure comprises the following steps of S1.taking a diaphragm as a matrix and printing electrode slurry on the surface of the diaphragm through a printing technology or a printing technology in order to distribute the electrode slurry on the surface of the diaphragm in a patterned mode; S2.carrying out vacuum drying on the diaphragm obtained in the step S1 in order to solidify the electrode slurry on the surface of the diaphragm to form an electrode material distributed in the patterned mode; and S3.plating or depositing a conductive thin film on the whole surface of the electrode materialdistributed in the patterned mode as a current collector through a vacuum coating technology or a spraying deposition technology in order to obtain the integrated structure. The integrated structureprepared by the invention is applied to the battery, so that the cycling performance of the battery can be improved, and the energy density of the battery can be improved.

The invention provides a MnO2 nanosheet/TiC composite and a preparation method thereof. The method comprises the following steps: dispersing Ti3C2 nanopowder and dopamine hydrochloride in ultrapure water respectively, performing mixing evenly, and performing stirring under the shading condition; adding a Tris-buffer solution, and performing stirring continuously under the shading condition; performing separating, water washing and drying on the obtained mixed solution to obtain Ti3C2@PDA nano-powder; adding the Ti3C2@PDA nano-powder to ultrapure water, and adding a KMnO4 solution after uniformdispersing for liquid phase reaction; performing cooling naturally after the reaction is finished to obtain the MnO2 nanosheet/TiC composite. With the method, uniformly distributed MnO2 nanosheets can be formed on the surface of TiC, and the preparation method has low equipment requirement, is simple to operate and low in cost, and facilitates industrial large-scale production.

The invention relates to a device and process for manufacturing a positive/negative electrode material of a lithium battery. The device consists of a feeder, a fluidized bed mixer, a gas-solid separator, a spiral continuous feeding reaction device preheating section, a spiral continuous feeding reaction device reacting section, and a cooling device. The process for manufacturing the positive/negative electrode material of the lithium battery comprises the following steps of: firstly feeding raw materials for manufacturing the positive/negative electrode material of the lithium battery into the fluidized bed mixer through the feeder, fully mixing and then separating by the gas-solid separator, sequentially entering the spiral continuous feeding reaction device preheating section and the spiral continuous feeding reaction device reacting section, heating and reacting to generate the positive/negative electrode material of the lithium battery, and then entering the cooling device to be cooled, finally discharging the positive/negative electrode material of the lithium battery from a product outlet. The device and process provided by the invention can be used for continuously manufacturing the positive/negative electrode material of the lithium battery efficiently with low energy consumption.

The invention relates to the field of lithium ion batteries and discloses a preparation method of a laminated lithium ion battery and the laminated lithium ion battery. The method comprises the following steps: laminating a negative plate and a positive plate to obtain a laminated cell body; fixing the middle of the laminated cell body; naturally placing the laminated cell body on the top of an arc-shaped bracket; hot-pressing the laminated cell body; standing the laminated cell body to obtain an arc-shaped laminated cell body, wherein the natural lengths of the positive plate and the negative plate are gradually lengthened from inside to outside along the arc of the arc-shaped laminated cell body in the arc-shaped laminated cell body; placing the arc-shaped laminated cell body into a cell body recess of an aluminum plastic film shell, and thermally sealing an aluminum plastic film to encapsulate the arc-shaped laminated cell body into the aluminum plastic film shell to obtain the laminated lithium ion battery. By the adoption of the technical scheme, the appearance of the battery can be improved, and the electrical performance of the battery is improved.

The invention relates to the field of a lithium-ion battery, and discloses a preparation method of a laminated lithium-ion battery and the battery. The preparation method comprises the following steps of: loading each positive plate into a diaphragm bag according to the following bag loading process to obtain a positive plate diaphragm bag, wherein the bag loading process is as follows: a first diaphragm and a second diaphragm are respectively arranged on the top surface and the bottom surface of each positive plate, and at least one wide end of each of the first diaphragm and the second diaphragm is thermally sealed; laminating a negative plate diaphragm bag and the positive plate diaphragm bag to obtain a laminated cell body, fixing the middle part of the laminated cell body, naturally placing the laminated cell body to ensure that each diaphragm layer inside the laminated cell body is bonded with adjacent positive plate and negative plate of the diaphragm layers; standing the laminated cell body to obtain an arc laminated cell body; placing the arc laminated cell body into a cell body concave position of an aluminum-plastic film shell to be thermally sealed with an aluminum-plastic film, and packaging the arc laminated cell body into the aluminum-plastic film shell to obtain the laminated lithium-ion battery.

The invention relates to the technical field of lithium ion battery, and discloses a packaging mold and a packaging method used for an aluminum/plastic film. The mold comprises an upper packaging part and a lower packaging part, the bottom of the upper packaging part is a curved surface; the top of the lower packaging part is a second curved surface; the first curved surface and the second curved surface can be tightly matched with each other face to face. With the technical solution, the appearance of the battery can be improved; and electrochemical performance can be increased.

The invention discloses MXene/graphene/carbon nanotube gel with high magnification and long service life as well as a preparation method and application of the MXene/graphene/carbon nanotube gel. The invention belongs to the field of supercapacitor electrode materials and preparation thereof. The invention aims to solve the technical problem that the existing supercapacitor electrode material MXene is easy to oxidize, stack and agglomerate. The MXene/graphene/carbon nanotube gel provided by the invention is formed by mutual crosslinking of a two-dimensional MXene sheet layer, a graphene nanosheet and a carbon nanotube, and the MXene/graphene/carbon nanotube gel has a three-dimensional hierarchical porous structure. The three-dimensional porous open structure effectively inhibits serious stacking and agglomeration of two-dimensional MXene sheet layers, improves the surface utilization rate of the MXene material, increases the number of active sites, and increases the specific capacity of the material; meanwhile, due to the addition of graphene and vitamin C, the oxidation of MXene can be inhibited, so that the gel has relatively good oxidation resistance; in addition, the porous structure can be used as a reservoir to shorten the diffusion path of electrolyte ions and improve the rate characteristic of the electrode.

The invention discloses a nano solid-core iron phosphate-carbon source-graphene composite material; the surfaces of nano solid-core iron phosphate particles are coated with a carbon source, the particles are connected through graphene, and the nano solid-core iron phosphate-carbon source-graphene composite material is formed. The invention also discloses a preparation method of the material. The process flow is simple, the cost is low, at the same time, nitrate radicals are adopted, and the disadvantages in a traditional process that sulfate radicals in an FeSO4 raw material are difficult to wash cleanly and chloride ions in an FeCl3 raw material have a corrosion effect on equipment are overcome. The prepared lithium iron phosphate positive electrode material has the tap density reaching up to 1.68 g/cm<3>, has large volume specific capacity, is beneficial for preparation of a positive electrode material slurry and coating of an electrode slice, and improves the quality of the electrode slice.

The invention discloses a preparation method of a composite coated modified lithium iron manganese phosphate positive electrode material in the technical field of lithium ion battery positive electrode materials. The preparation method comprises the steps of carrying out composite coating modification on lithium iron manganese phosphate at room temperature by utilizing a mutual promotion effect between silicon source hydrolysis and dopamine polymerization processes; and calcining to obtain the SiO2 and nitrogen-doped carbon co-coated lithium iron manganese phosphate positive electrode material of the lithium battery. By means of composite coating modification of SiO2 and carbon coating, direct contact between the positive electrode material and electrolyte is avoided, harmful side reactions are reduced, the thermal stability of the positive electrode material can be improved, and the conductivity of the positive electrode material can be effectively improved, so that the rate performance and the cycle performance of the positive electrode material can be improved.

The invention belongs to the field of metal corrosion protection, and particularly relates to preparation of an MXene/fluorosilane (FAS) super-hydrophobic surface composite film and application of theMXene/FAS super-hydrophobic surface composite film in metal corrosion protection. The application method comprises the following steps: pretreating the surface of a metal sample, modifying SiO2 nanoparticles with gamma-GPS silane, preparing dispersion liquid, preparing an MXene/FAS mixed solution, sequentially spin-coating the surface of the pretreated metal sample with the two dispersion liquidsto form a film, drying the spin-coated metal sample at room temperature, and then conducting curing in a drying oven to form the film. The MXene/FAS super-hydrophobic composite film surface protection technology is adopted, so that the composite film has excellent super-hydrophobic self-cleaning performance and corrosion resistance, and the durable cleaning and corrosion resistance of the surfaceof the metal material can be remarkably improved. In addition, the protective film prepared by the invention is simple to operate and meets the requirement of environmental protection. Doping of MXene can effectively hinder diffusion of a corrosive medium, and the corrosion resistance of the composite film is improved.

The invention relates to the field of lithium ion batteries and discloses a positive plate diaphragm bag as well as a laminated lithium ion battery and a manufacturing method thereof. A positive plate diaphragm bag comprises a first diaphragm layer, a second diaphragm layer and positive plates, the first diaphragm layer and the second diaphragm layer directly face the top surface and the undersurface of each positive plate respectively, and edges, exceeding the positive plates, of the first diaphragm layer and the second diaphragm layer are connected together by laser spot welding. By applying the technical scheme, improving of product appearance and electrochemical performance is facilitated.

The invention discloses electrode material ink, a preparation method and a method for preparing a miniature supercapacitor by using the same, and belongs to the technical field of miniature supercapacitors. The preparation method of the electrode material ink comprises the following steps: 1) adding a dispersing agent and an electrode material into an alcohol solution, and carrying out ultrasonictreatment to prepare a primary ultrasonic dispersion solution; 2) adding a target solvent into the primary ultrasonic dispersion liquid of the electrode material, and performing secondary ultrasonic treatment to obtain secondary ultrasonic dispersion liquid; and 3) removing the alcohol liquid in the secondary ultrasonic dispersion liquid to obtain the electrode material ink. By utilizing the preparation method disclosed by the invention, ink with different viscosities and different fluidity can be prepared by adjusting the amounts of the electrode material and the solvent, capacitors with different shapes and different sizes can be printed, and the preparation method does not contain toxic solvents and is suitable for large-scale production. The electrode material ink provided by the invention is uniform in dispersion of the electrode material, has good film-forming property, and can be printed on different substrates.

The invention discloses a method for synthesizing a delta-MnO2 nanosheet array. The method comprises the steps that a KMnO4 solution and a KF solution are mixed firstly according to the molar ratio ofKMnO4 to KF being 1:(2-6), and the pH is adjusted to range from 1 to 3 with dilute H2SO4; a substrate material is added, and a hydrothermal reaction is carried out at the temperature of 100 DEG C to140 DEG C; after the reaction is finished, flushing is carried out, and drying is carried out to obtain the delta-MnO2 nanosheet array. According to the method, a one-step hydrothermal method is adopted, and the array material which is ultrathin, free of agglomeration, undamaged in crystal, high in purity and controllable in morphology is prepared; and the process is simple, and energy consumptionis low. The prepared delta-MnO2 material with the nanosheet array morphology evenly grows on a substrate, the morphology is even, agglomeration is avoided, the delta-MnO2 material can be directly adopted as an electrode of various electronic devices, and reduction of the specific surface area of a nano material and reduction of the electrochemical performance due to use of an adhesive, a conductive agent and the like are avoided; and meanwhile the contact surface of the material can be effectively increased through the nanosheet array structure, and the utilization rate of the material is increased.

The invention provides a preparation method of a manganese dioxide electrode (epsilon-MnO2). The method comprises the following steps: mixing a divalent manganese salt, hydrogen peroxide, an alkali metal hydroxide and water; carrying out centrifugal treatment on the mixed treatment product to obtain a centrifugal precipitate; and calcining the centrifugal precipitate to obtain the manganese dioxide electrode. The method is low in production cost, simple in process, convenient to operate, easy to control and environmentally friendly, and the prepared manganese dioxide electrode material has excellent electrochemical performance and is suitable for large-scale industrial production.

The invention provides a manganese dioxide nanowire/titanium carbide composite material and a preparation method thereof. The preparation method comprises the steps of respectively dispersing Ti3C2 nanometer powder and dopamine hydrochloride in ultrapure water, performing uniform mixing, and performing stirring under a shading condition; adding a Tris-buffer liquid, and continuing to stir under the shading condition; separating, washing and drying the obtained mixed solution to obtain Ti3C2@PDA nanometer powder; adding the Ti3C2@PDA nanometer powder into a PEG solution, adding KMNO4 solution after uniform dispersion, and performing liquid-phase reaction; and naturally cooling after reaction is ended, thereby obtaining the manganese dioxide nanowire/titanium carbide composite material. By the method, uniformly-distributed manganese dioxide nanowires can be formed on a surface of carbon titanium, the obtained composite material has good electrochemical performance, the preparation methodis low in equipment requirement and low in cost and is simple and convenient to operate, and industrial production on a large scale is favorably achieved.

The invention provides a preparation method for a lithium vanadium phosphate slurry-based positive electrode of a lithium ion battery. The preparation method comprises the steps of dispersing Li<3>V<2>(PO<4>)<3>/C, a conductive agent, a binder and a slurry additive into N-methyl-2-pyrrolidone in a way of ball grinding or stirring to obtain uniformly-mixed and high-dispersity monoclinic Li<3>V<2>(PO<4>)<3>/C slurry, wherein the ratio of an active material to the conductive agent to the binder to the slurry additive to the N-methyl-2-pyrrolidone is (81-84wt%) to (9-11wt%) to (4-6wt%) to (1-6wt%) to 10wt%, and the total weight percentage is 110%; uniformly coating a current collector with the monoclinic Li<3>V<2>(PO<4>)<3>/C slurry in a spin-coating manner, and performing vacuum drying at a temperature of 100-120 DEG C to obtain a primary electrode plate; and cutting the primary electrode plate into a finished electrode plate with an area of 0.8-1.5cm<2> and performing electrical performance test on the finished electrode plate. The preparation method has the beneficial effects that the rate and cycling performance of the Li<3>V<2>(PO<4>)<3>/C can be simply and effectively improved due to the design.

The invention discloses a high-performance carbon-based substrate for a supercapacitor and a preparation method thereof. The preparation method comprises the following steps that (1), a carbon cloth is soaked with absolute ethyl alcohol, then washed with deionized water, and then drying is conducted at a constant temperature; (2), the carbon cloth is subjected to high temperature heating treatment, and the heating process is performed under oxygen protection; (3), the carbon cloth obtained after oxidation is placed in aqua regia for soaking, washed with deionized water and then subjected to constant temperature drying treatment; (4), then the cloth is soaked in an aluminum chloride-containing sodium borohydride solution, washed with deionized water under ultrasonication and then dried; (5), then the cloth is soaked in a potassium permanganate solution, washed under the acidic condition of hydrogen peroxide, washed with deionized water and then dried at a constant temperature to obtain a high-performance carbon-based substrate for the supercapacitor. Accordingly, the performance optimization of the carbon-based substrate can be achieved, and the optimized carbon-based substrate has the certain size of oxidized pore morphology, good electrochemical performance and high specific capacitance, and the specific volume is increased by 477.7% compared with non-oxidized blank sample.