161results about How to "Good high current discharge performance" patented technology

The invention discloses a preparation method of a silicon and carbon-coated graphene composite cathode material. The technical problem to be solved is to enhance the electronic conductivity of the silicon-based cathode material, buffer the volume effect produced in the process of deintercalation of the lithium in the silicon-based cathode material and enhance the structure stability in the circulation process of the material at the same time. The material is prepared by using a spray drying-thermally decomposing treatment process in the invention. The preparation method comprises the following steps of: evenly dispersing nano silicon and graphite micro powder in a dispersion solution of oxidized graphene, carrying out thermal treatment under an inert protection atmosphere after spray drying, subsequently cooling along a furnace to obtain the silicon and carbon-coated graphene composite cathode material. The extra binder does not need to add in the process of manufacturing balls in the invention and the outer oxidized graphene is thermally reduced in situ to graphene in the thermal treatment process of the composite precursor, so that the process is simple and easy to operate; and the practical degree is high. The prepared composite material has the advantages of great reversible capacity, designable capacity, good cycling performance and high-current discharging performance, high tap density and the like.

In a lithium-ion secondary battery of the present invention, the electrical resistivity of the mixture of a positive electrode active material, an electrically conductive member, and a binder is 0.1 Ωcm or more but 1 Ωcm or less. The positive and negative electrodes each have an electrical capacity of 10 mAh or more but 50 mAh or less per volume of a rectangular parallelepiped that has a 1 cm² square base on a face of the electrode of one polarity facing the electrode of the other polarity and that has a height equal to the thickness of the electrode of the one polarity at the square base. Used as the negative electrode thereof is a negative electrode formed by sintering graphite powder, non-graphitizing carbon, and fibrous powder retained in the pores of a porous metal structure in an inert gas atmosphere at a temperature of between 600 and 1000° C.

The invention discloses a high-performance flexible composite nonwoven fabric membrane for a lithium ion battery, as well as a preparation method and an application of the membrane, which belongs to the technical field of a lithium-ion battery membrane material. The prepared composite nonwoven fabric membrane is formed by coating functional serous fluid with thermally curable or optically curable functional groups onto a substrate membrane containing an active functional group, thermally curing or optically curing the substrate membrane, removing a pore-forming agent, and hot pressing and drying the substrate. The prepared composite nonwoven fabric membrane is good in flexibility. The composite nonwoven fabric membrane has good ion electric conductivity and hot shrinkage resistance, can bear the large-current discharge, and also can improve the safety performance of the battery. Since no fluorine-containing adhesive is used in a preparation process, nano particles or nano optical fibers are connected with the substrate membrane through a chemical key, the nano particles or the nano fibers are bonded together through the chemical key and free from dropping off in the charging-discharging cycle, the stability of the coating is enhanced, and the cycling performance of the battery can be improved. The prepared flexible composite nonwoven fabric membrane is used as a membrane assembly of the lithium ion battery.

The invention discloses a lithium ion battery phosphatic composite cathode material and a preparation method thereof. The composite material is a multinuclear core shell structure composed of a plurality of cores and a housing layer, the cores are lithium iron phosphate particles wrapped by lithium vanadium phosphate and the housing layer is amorphous carbon. Preparation of the lithium iron phosphate particles wrapped by lithium vanadium phosphate comprises the following steps: preparing precursor sol with a sol gel method, adding lithium iron phosphate powder to disperse uniformly, carrying out spray drying on the above mixture, calcining the above resultant in inert gas, and followed by cooling and grinding to obtain the lithium iron phosphate particles wrapped by lithium vanadium phosphate. Preparation of the composite cathode material comprises the following steps: dissolving a carbon source compound into deionized water, adding core materials, dispersing the above resultant uniformly, carrying out second spray drying, calcining the above resultant in inert gas, and followed by cooling to obtain the composite cathode material. The composite material prepared in the invention has good electronic conduction performance, good ionic conduction performance and excellent electrochemistry performance. Because of existence of lithium vanadium phosphate, energetic density of a material is raised. Because of the multinuclear core shell structure like nano/micro structures, the composite material has good processing performance, and tap density of the material is greatly raised.

The invention discloses a preparation method for a composite cathode material of a lithium ion battery by means of spray drying pyrolysis treatment. The preparation method includes the steps: dissolving a first type of binder organic carbon source into solvent of a proper quantity, adding a silicon source, a second type of binder and a dispersing agent, dispersing uniformly, adding graphite, dispersing for a certain time, subjecting uniformly dispersed suspension to spray drying, and using the first type of binder organic carbon source to bond the silicon source, the graphite and the second type of binder particles into spherical or spherical-like forms to obtain a composite precursor; and transferring the precursor into a shielding atmosphere for sintering, heating the second type of binder to a certain temperature to be melted into a liquid crystal state, bonding the particle silicon source and the graphite into cores, subjecting the organic carbon source to pyrolysis at the high temperature to form a coating, and furnace cooling to obtain the carbon-silicon composite cathode material of the lithium ion battery. The preparation method is simple, easy in implementation and high in practicality. The carbon-silicon composite prepared by the method has the advantages of high reversible capacity, designable capacity, high circulating performance and high-current discharging performance, high tap density and the like.

The invention provides a preparation method of lithium iron phosphate of a lithium-ion secondary battery positive electrode active material, the method comprises: a ferrous source compound, a phosphorus source compound, a lithium source compound and a carbon source compound are mixed, the first sintering is carried out on the obtained mixture under the protection atmosphere, products in the first sintering are ball-milled and dried, the second sintering is further carried out to obtain the lithium iron phosphate, wherein, the method further comprises the heating of the mixture at the temperature of 60-250 DEG C under the oxidation atmosphere before the first sintering or after the first sintering. The lithium iron phosphate which is obtained by adopting the method can have both high volume specific capacity and excellent high-current discharge performance.

A foam lithium cathode of a lithium metal secondary battery and a method for preparing the same relate to a lithium metal secondary battery cathode and a method for preparing the same. The present invention solves the problems that the prior lithium metal secondary battery cathode material with lithium foil metal as the main material has poor cyclicity and safety. The foam lithium cathode consists of a foam metal substrate and a lithium deposit layer deposited on the surface of the foam metal substrate. The preparation method comprises the following procedures: the surface of the foam metal substrate is treated and then lithium is electrodeposited or plated lithium is vaporized. With the foam lithium material as the cathode of the lithium metal secondary battery, the real area of the cathode is large and the real current density of charge and discharge is small; no dendritic crystal and no dead lithium are produced easily; in a three-dimensional foam structure, the dendritic crystal grows in the inner side of the foam, thereby reducing the occurrence of short circuit and improving the safety and the cyclicity of the lithium metal secondary battery.

The invention discloses cathode diachylon used for a power-type lead-acid storage battery, comprising the following components: 100kg of lead powder, 0.10-0.12kg of short fiber, 0.40-0.60kg of humic acid, 0.12-0.30kg of sodium lignin sulfonate, 1.00-2.00kg of acetylene black, 1.00-1.50kg of conduction graphite, 2.00-3.00kg of activated carbon, 0.60-1.00kg of barium sulphate, 15000-22000g of deionized water and 7200-6000ml of sulfuric acid with the concentration of 1.30-1.40g/cm<3>(25 DEG C). The cathode diachylon has the beneficial effect that the power-type battery produced by the cathode diachylon has the advantages of high specific energy and good large current discharging capability, the low-temperature volume and cycle life are obviously improved.

The invention discloses a polypyrrole minitype super capacitor in the range of the capacitor manufacturing technology based on MEMS technology and the preparation method thereof. The polypyrrole minitype super capacitor adopts the structure that a metal comb two-dimensional plane structure as a current collector is prepared on the surface of the silicon matrix by utilizing the micro-machining technology; a comb-shaped polypyrrole active electrode is prepared on the surface of the current collector by adopting the method of polypyrrole substance being prepared by the electric precipitation method; a layer of gel solid electrolyte is covered on the surface of the comb-shaped polypyrrole electrode and between a positive electrode and a negative electrode; and a layer of polyimide material is covered on the surface of the structure to accomplish the encapsulation of the minitype super capacitor. The MEMS-based manufacturing technology has the characteristic that the process is simple, and is suitable for mass manufacture. The minitype super capacitor has the advantages of small volume, high energy storage and stable performance, and is widely applicable to micro-robot electronic intelligence systems, chemical sensors, battlefield friend-or-foe identification devices, distributed type battlefield sensors and other fields.

This invention relates to FeLiPO4 doped with La or Ac, positive material of Li ionic secondary cells and its preparation method characterizing that the formula is: LiMxFe1-xPO4 (M is La or Ac, 0.01<-x<-0.05) in the structure of olivine, the preparation includes the following steps: taking Li compound, Fe, phosphate, La or Ac as the raw materials to add them into a ball mill for wet mill then putting them into N2 and H2 mixed atmosphere for pre-calcining, then wet-grinding them and drying them and then ball-milling them, then putting them into N2 and H2 mixed atmosphere for secondary calcining to get the invented positive material. Advantages: fine crystalizatin, conduction performance of ions is good and discharge performance of heavy current is good, tap density is great and the problem of easy oxidation of Fe2+ is solved.

The invention relates to a nickel-zinc secondary battery and a preparation method thereof. The technical scheme is that: the preparation method comprises the following steps of: mixing 85 to 99 weight percent of anode active substance, 0.5 to 10 weight percent of anode additive and 0.5 to 5 weight percent of anode bonding agent uniformly; adding water into the mixture to prepare paste; coating the paste on an anode conductive matrix; drying, performing roll forming and slicing to obtain an anode plate; mixing 75 to 99 weight percent of cathode active substance, 0.5 to 20 weight percent of cathode additive and 0.5 to 5 weight percent of cathode bonding agent uniformly; adding water into the mixture to prepare paste; coating the paste on a cathode conductive matrix; drying, performing roll forming and slicing to obtain a cathode plate; separating the anode plate from the cathode plate by using diaphragm paper; winding the separated anode plate and cathode plate to be a cylindrical shape; sleeving the cylindrical object into a battery case; injecting electrolyte, wherein the anode plate is connected with an anode cap by a lug and the cathode plate contacts with the battery case; and sealing the battery to form the nickel-zinc secondary battery. The nickel-zinc secondary battery prepared by the method has a long cycle life, a high discharging platform and high specific energy.

The invention discloses a high-multiplying power lithium ion battery and a preparation method thereof. The lithium ion battery comprises a cathode plate, an anode plate, a composite diaphragm and an electrolyte solution, and the surfaces of the diaphragm are coated with composite conductive layers; each composite conductive layer is composed of a bonding agent, a conductive agent and micropores; the cathode plate and the anode plate are each of a full-tab structure. The preparation method comprises the steps that the diaphragm coated with the composite conductive layers, the cathode plate and the anode plate are subjected to a winding process to prepare a wound core, and the wound core is subjected to the processes of packaging, baking, liquid injecting, hot-cold pressing, forming and capacity grading to prepare the high-multiplying power lithium ion battery. According to the high-multiplying power lithium ion battery and the preparation method thereof, by improving the characteristics of the interfaces between the diaphragm and cathode and anode membranes and optimizing the structural design of the battery, the bonding performance of the contact interfaces between the diaphragm and the cathode and anode plates is improved, the lithium ion transfer resistance between the different interfaces is decreased, the electronic conductivity of the cathode and anode plates is enhanced, the porosity and the air permeability of the composite diaphragm are improved, wetting of the electrolyte solution to the diaphragm is improved, the retaining capacity of the electrolyte solution in the battery is improved, the high-multiplying power performance of the lithium ion battery is greatly improved, the high-multiplying power discharge capacity retention rate is increased by 10% or above compared with the prior art, and the high-multiplying power lithium ion battery is suitable for industrialized production.

A non-aqueous electrolyte secondary cell having superior high temperature-operation properties and excellent large current-discharge properties is provided. The non-aqueous electrolyte secondary cell has a positive electrode composed of a positive electrode collector and positive electrode active material layers formed thereon. A positive electrode active material contained in the above layer is formed of a first composite oxide and a second composite oxide mixed therewith. The first composite oxide is formed of grains of a first lithium transition metal composite oxide containing at least nickel as a transition metal and a cover layer formed on at least part of the surface of each of the grains for suppressing decomposition of an electrolyte caused by the first lithium transition metal composite oxide. The second composite oxide is composed of grains of a second lithium transition metal composite oxide.

The invention relates to a cathode of a lithium ion secondary battery, comprising a current collector and cathode material smeared over and/or filled in the current collector. The cathode material comprises cathode active substance and cathode adhesive. The cathode active substance is the mixture of a natural graphite and an artificial graphite, wherein, the natural graphite is the natural graphite with a ball shape, the artificial graphite is the artificial graphite with a micro granule scaly shape, the particle diameter of the natural graphite with the ball shape is longer than that of the artificial graphite with the micro granule scaly shape, the difference in value of the median diameter D50 between the natural graphite with the ball shape and the artificial graphite with the micro granule scaly shape is 4-25 microns; the median diameter D50 of the artificial graphite with the micro granule scaly shape is 0. 3-6 microns; the proportion by weight between the natural graphite with the ball shape and the artificial graphite with the micro granule scaly shape is 1:0.05-0.2. The lithium ion secondary battery provided by the invention has good circle performance and discharging performance with a large rate and safety performance under the condition of high capacity.

A lithium primary battery including a positive electrode, a negative electrode, an organic electrolyte, and a separator interposed between the positive electrode and the negative electrode: the negative electrode including a negative electrode active material; the negative electrode active material being at least one selected from the group consisting of lithium metal and a lithium alloy; at least a surface layer portion of the negative electrode including a composite of amorphous carbon material and the negative electrode active material; and the surface layer portion facing the positive electrode with the separator interposed therebetween.

According to one embodiment, there is provided an active material including monoclinic niobium titanium composite oxide particles and a carbon material layer. The monoclinic niobium titanium composite oxide particles can absorb and release Li ions or Na ions and satisfy Formula (1) below. The carbon material layer covers at least a part of surfaces of the niobium titanium composite oxide particles and satisfies Formula (2) below: 0.5≰(α/β)≰2  (1) 0≰(γ/σ)≰0.1  (2)

The invention discloses a manufacturing method of a nickel-hydrogen battery. The manufacturing method comprises a positive plate manufacturing process, a negative plate manufacturing process, a rolling process, a placement process, an electrolyte injection process and a seal process. A diaphragm is arranged between a positive plate and a negative plate. A turnup edge of the positive plate stretches out of the upper end of the diaphragm and a raised part of a negative plate stretches out of the lower end of the diaphragm so that the plates are rolled together to form a cell. The upper end of the cell is connected to a battery cap by a current collector disc. The nickel-hydrogen battery comprises the positive plate, the negative plate, the diaphragm sandwiched between the positive plate and the negative plate, the battery cap and a battery case. The turnup edge of the positive plate stretches out of the upper end of the diaphragm and is bent by pressing to reach to the upper end surface of the cell. The upper end of the cell is electrically connected to the battery cap by the current collector disc. The manufacturing method is convenient for operation and batch production. The nickel-hydrogen battery has high charging efficiency, good heavy current discharge performances and excellent dynamic performances.

The preparation process of artificial graphite charcoal as negative pole material includes the following steps: 1. adding artificial graphite powder and asphalt in the weight ratio of 1.5-19 to 1 while stirring, stirring for further 0.5-3 hr, and adding reaction assistant in 4-20 wt% of graphite powder and asphalt within 10-50 min; 2. heating to 500-600 deg.c in 4-10 hr and pumping out the light component in the first 1-2 hr; 3. maintaining at 500-600 deg.c for 3-8 hr while pumping out the heavy components and reaction assistant; 4. cooling to room temperature and 5. graphitizing. The present invention has environment friendship and high yield, and the prepared artificial graphite charcoal as negative pole material has the advantages of common artificial graphite, the density near that of natural graphite and lowered specific surface area.

The invention relates to a preparation method of lithium iron phosphate, an active substance applied in the anode of lithium-ion secondary batteries. The method comprises that a mixture that contains lithium compound, iron compound, phosphorus compound and carbon source additive is sintered and cooled to get a sintering product; wherein, the iron compound is ferric iron compound; the sintering method comprises the step: the mixture that contains lithium compound, iron compound, phosphorus compound and carbon source additive is sintered at a first constant sintering temperature, then a mixture of the product acquired at the first sintering temperature and the carbon source additive is sintered at a second constant sintering temperature, and the second sintering temperature is at least 80 DEG C higher than the first sintering temperature. Batteries made of the lithium iron phosphate acquired by the method of the invention have both high capacity and good discharge performance at high current.

The invention provides a lithium ion secondary cell cathode and a cell. The lithium ion secondary cell cathode comprises a conductive agent, graphite, a caking agent and a current collecting body; the graphite is formed by mixing first graphite and second graphite by weight percentage of 5-30 to 95-70; the average particle diameter of the first graphite is between 0.5 and 2 mu m; the average particle diameter of the second graphite is between 4 and 12 mu m, wherein the graphite is coated-type graphite coated with a coating agent; and the coating agent is 1 to 20 weight percent of gross weight of the graphite. The average particle diameter of the first coated-type graphite is between 0.8 and 2.3 mu m; and the average particle diameter of the second coated-type graphite is between 5 and 13 mu m. The provided cathode has excellent large-current discharging performance and is in particular suitable for application of a power cell.

The invention relates to a combined double-effect oxygen catalyst and an electrode and a battery containing the same. The catalyst is a combination of a non-crystalline alloy and a bifunctional catalyst. The electrode comprises a gas diffusion layer, a catalyst layer and a current collector electrically contacted with the catalyst layer, and is characterized in that the catalyst included in the catalyst layer is the combined double-effect oxygen catalyst of the invention. The battery mainly comprises an air electrode, a membrane and an anode, wherein the air electrode adopts a double-effect oxygen electrode. The catalyst and the electrode have the advantages that the catalyst has high catalytic activity and the electrode prepared from the same is characterized by high stability for charging and discharging circulation performance, high heavy-current discharging performance, high working voltage, simple preparation process and low cost.

The invention provides a lead-carbon super battery anode material which is a graphene/Pb nano composite material. The lead-carbon super battery anode material is prepared by mixing a lead salt solution with a graphite oxide solution, carrying out hydrothermal reaction, and then carrying out macro body freeze drying and burning. The lead-carbon super battery anode material is prepared from 91 to 99.5 percent of lead and 0.5 to 9 percent of graphene. The lead salt solution is prepared by dissolving soluble lead salt into deionized water; the soluble lead salt is one or several of lead-containing nitrate, acetate, carbonate, hydrochloride, sulfate and complex salt. The invention further provides a preparation method of the lead-carbon super battery anode material. The preparation method provided by the invention has the advantages of high efficiency, environmental friendliness, high uniformity and the like; the prepared lead-carbon super battery anode material is high in uniformity, high in stability and wide in application prospect.