95results about How to "Increase volume specific energy" patented technology

The invention belongs to the technical field of a cathode material for a lithium primary battery, particularly relates to the field of preparation of the cathode material for a fluorocarbon battery, and in particular to a composite carbon fluoride cathode material for the lithium primary battery, a preparation method and an application thereof. The material is a composite material prepared by ballmilling and mixing a porous carbon fluoride material having a high tap density and a carbon fluoride material having a high graphitization degree and then fluorinating the mixture. The composite material has a carbon content of 38-60%, a fluorine content of 40-62% and a tap density of greater than 0.8g/ml; the mixing mass ratio is in the range of 1:0.1-1:10; and the composite material has high specific surface area, high tap density and high graphitization degree. Due to the high tap density of the material, the overall high volumetric specific energy of the material is guaranteed; through anion diffusion channel composed of porous carbon fluorides, the voltage hysteresis phenomenon at the initial stage of the battery discharge is effectively improved and the overall discharge performance of the material is improved.

The invention discloses a water-soluble three-dimensional network type electrode binding agent, comprising a water-soluble polymer polyelectrolyte. Molecular chains of the polyelectrolyte contain active groups; the molecular chains of the polyelectrolyte are cross-linked and bridged by a cross-linking agent to form a three-dimensional network type molecular structure. The invention also disclosesa preparation method of the binding agent, an electrode piece prepared by utilizing the binding agent, and electrochemical devices. In the water-soluble three-dimensional network type electrode binding agent disclosed by the invention, the water solubility is good, the viscosity is adjustable, and the tensile strength and the Young modulus are controllable; in the carbon electrode piece prepared by the electrode binding agent, the mechanical property is good, the phenomenon of common material falling of the electrode piece can be avoided, the irreversible capacity is low in the first chargingprocess, the reversible capacity is high, and electrochemical devices such as lithium-ion batteries and super capacitors and the like with excellent circulating performance can be manufactured.

The invention discloses a method for preparing a lithium nickel manganese oxide anode material. The method includes the steps that A, divalent nickel salt, divalent manganese salt and Li<+> compounds are evenly mixed and grinded, and a nickel, manganese and lithium mixture is obtained; B, persulfate with the molar weight larger than the sum of the molar weight of the divalent nickel salt and the molar weight of the divalent manganese salt and the mixture obtained in the step A are mixed and grinded, and a reaction mixture is obtained; C, the reaction mixture obtained in the step B is transferred into a polytetrafluoroethylene reaction kettle, water is added, a cover and a stainless steel reaction-kettle outer bush are arranged for sealing, the reaction temperature is controlled and kept, and reactants are obtained; D, the reactants obtained in the step C are taken out and washed with water till no sulfate radical is detected, suction filtration is carried out, and brown or black solid is obtained; E, the brown or black solid is transferred into a crucible, in the atmosphere environment, roasting is carried out, natural cooling is carried out, and the lithium nickel manganese oxide anode material is obtained. The raw materials are abundant, the price is low, environment pollution is avoided, and a brand new easy and convenient solid-liquid film phase reaction method with the easily-controlled conditions and the simple devices is adopted.

The invention discloses a liquid flexible packaged lithium-ion cell and a manufacture method thereof. The liquid flexible packaged lithium-ion cell comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein an active medium of the positive electrode is lithium cobalt oxide LiCoO2, an active medium of the positive electrode is synthetic graphite, and the electrolyte is an electrolyte in which an impregnating compound, a stabilizing agent and a high-temperature additive are added. The manufacture method comprises the following steps of: preparing the positive electrode, namely, the lithium cobalt oxide, a conductive agent and a macromolecule binding agent form a mixture and then the mixture is uniformly coated on the surface of a metal aluminum foil; preparing the negative electrode, namely, the synthetic graphite, the conductive agent and the binding agent form a mixture, and the mixture is uniformly coated on the surface of a metal copper foil; and preparing the electrolyte, namely, the impregnating agent, the stabilizing agent and the high-temperature additive are blended into the electrolyte. According to the manufacture method, the volumetric specific energy of the lithium-ion cell can be remarkably improved, and the final battery cell is good in electrochemical performance.

The present invention relates to a compound lithium cobaltate cathode material, a preparing method thereof and a lithium ion secondary battery. The chemical formula of the cathode material is xLiNi1/3Mn1/3Co1/3O2-LiCoO2, wherein the numerical value of x is 0.005-0.05. The compound lithium cobaltate disclosed by the invention not only can satisfy the requirement of high energy density, but also can cause that the lithium ion battery has excellent electrochemical property. The problem of electrochemical property of large-particle lithium cobaltate is effectively settled. The compound lithium cobaltate cathode material has the characteristics of high volumetric specific energy and excellent circulating performance.

The invention discloses a preparation method of a cobalt-based material for the positive poles of lithium batteries, which comprises the following steps of: coating a nickel-cobalt-manganese hydroxide on the outer surface of spherical cobaltosic oxide and sintering to form the cobalt-based material of LiCo0.6Mn0.2Ni0.2O2. The cobalt-based material prepared by using the preparation method only not maintains the characteristics of lithium cobaltate materials of high volumetric specific energy and high discharge platform, but also has higher heat stability compared with lithium cobaltate, also reduces the cost of the lithium cobaltate materials and is the substitute of the next generation lithium cobaltate positive pole materials.

Belonging to the technical field of lithium ion battery anode materials, the invention relates to a method for uniform carbon coating on a lithium iron phosphate surface. The method includes the steps of: (1) preparation of an emulsion: preparing an organic carbon source and water into an aqueous solution, conducting heating to 50-100DEG C, adding an additive, and performing stirring to form an emulsion; (2) coating of the lithium iron phosphate surface with the organic carbon source: adding spherical iron phosphate into the emulsion, performing mixing for 0.5-8h to obtain a rheological body, and conducting drying to obtain iron phosphate powder; and (3) preparation of a lithium iron phosphate/carbon composite cathode material: mixing iron phosphate powder with a lithium source according to a Fe-Li mole ratio of 1:1-1:1.2, placing the mixture into an argon protective atmosphere sintering furnace, conducting heat preservation at 250-400DEG C for 2-6h, then raising the temperature to 550-700DEG C and performing heat preservation for 6-16h, and carrying out furnace cooling and sieving so as to obtain the lithium iron phosphate/carbon composite cathode material. The method provided by the invention has the advantages of stable process, simplicity and easy control, low cost, safety and environmental protection, high utilization ratio of the organic carbon source, high volumetric specific energy of the material, and easy industrialization, etc.

The invention discloses a three-dimensional netted graphite foam or netted glassy carbon bipolar plate of an all-vanadium redox flow battery, which can improve the active material utilization of battery electrodes by increasing the specific surface area. According to the technical scheme, the bipolar plate comprises three-dimensional netted graphite foam or netted glassy carbon (1), and is characterized in that the three-dimensional netted graphite foam or netted glassy carbon (1) is provided with holes communicated with each other, and the carbon content of the three-dimensional netted graphite foam or netted glassy carbon (1) is 10%-100%; one or more graphite current collectors (2) are arranged on one or two sides or in the middle of the three-dimensional netted graphite foam or netted glassy carbon (1), and the carbon content of the graphite current collector (2) is 10%-100%.

The invention discloses a manufacturing method of a high-capacity high-magnification high-safety lithium ion battery. A positive pole material, a netty current collector, a negative pole material, a diaphragm and an electrolyte are adopted, and the positive pole material and the negative pole material are applied to the current collector to prepare a pole piece and prepare the battery. The preparation method of the current collector comprises the following steps of: (1) in an agitator kettle, dissolving PVDF (polyvinylidene fluoride) or PTFE (polytetrafluoroethylene) into NMP (N-methylpyrrolidone), or dissolving CMC into deionized water, then adding SBR (styrene butadiene rubber), stirring for 3-6hours, then adding a power mixture of one or more of silicon dioxide and aluminum oxide, with a concentration of 0.5-2%, and stirring so that powder is uniformly dispersed in the PVDF solution; and (2) applying a glue solution of the powder to the netty current collector by using a coater, and baking with an oven, so that the thickness of the powder on the current collector is 0.5-3mu m. The manufacturing method of the high-capacity high-magnification high-safety lithium ion battery has the beneficial effects of being simple in preparation, easy for production, and suitable for large-scale popularization and application.

The invention discloses a manufacturing method of a lithium ion battery high-compaction density pole plate. The pole plate comprises a metal current collector and a conducting mixed slurry; the conductive mixed slurry is coated on the metal current collector at twice or multiple times, the pole plate is dried and rolled after the first coating, and the plate is dried and then rolled after the second coating, the coating, the drying, and the rolling are orderly performed until the conducting mixed slurry is completely coated. The thickness of the conducting mixed slurry wet coating layer through twice or multiple coating is thinner than that of once coating process, the drying load is educed, the drying time is shortened, the single rolling load is reduced, the roll coating is hard to occurunder high rolling pressure, the coating uniformity and precision are improved, the compaction density of the pole plate is increased, so that the volumetric specific energy is increased, the internal resistance of the pole plate is reduced, the polarization is reduced, the discharge capacity is increased, the battery energy density is increased, the cost is reduced, the flexibility of the pole plate is guaranteed, and the phenomena that the surface is curly uneven and even the plate is broken or crisp are avoided.

The invention relates to a lead-acid storage battery, in particular to a bipolar-plate type unit high-energy lead-acid battery, a high-voltage battery pack formed from the same and a package method of the high-voltage battery pack. The unit high-energy lead-acid battery comprises an electronic conductor bipolar plate, wherein a positive active material layer and a negative active material layer are respectively coated on two surfaces of the electronic conductor bipolar plate and are the same active material prepared by taking lead sulfate as main, and a batter partition plate is laid on the active material layer on one surface. After the unit battery disclosed by the invention is adopted to package batteries stacked in series, the battery with high voltage, low internal resistance and long cycle lifetime is easy to achieve, meanwhile, the production process of the battery is simplified, and the production cost is reduced.

A lithium ion power low temperature cell comprises a tab (1), an anode plate (2), a cathode plate (4), a diaphragm (3), electrolyte (6) and an aluminum plastic die (5), and the invention adopts special proportioning and structure in the anode plate, the cathode plate and the electrolyte. The lithium ion power low temperature cell of the invention overcomes the defects that conventional products only can discharge under the environment of minus 20 DEG C to 60 DEG C, and has short discharging time or incapability of discharging under the condition of below minus 20 DEG C; the invention features stable performance, high energy of volume ratio, good safety and can satisfy high power discharging; the low temperature environment can satisfy normal work under the condition of minus 40 DEG C, and can discharge more than or equal to 70% of initial volume.

A volumetric specific energy valve-controlled sealed storage battery and a preparing method of the storage battery are disclosed to solve the problems in limited capacity and low volumetric specific energy of the storage battery. The storage battery comprises a storage battery groove, a storage battery cover, a big sealing cover, pole groups and a terminal, wherein the storage battery groove is provided with six single battery grooves side by side; the pole group is arranged in each of the single battery groups; the storage battery is characterized in that: the upper parts of the pole groups are higher than the single battery grooves; the pole groups in two adjacent single battery grooves are connected in series through a bus bar; terminal bus bars are arranged on the upper parts of the pole groups located in the single battery grooves at the two ends; and the terminal bus bars are provided with a terminal welding platform. The invention further provides a preparing method of the storage battery. In the preparing method of the invention, under the condition of an effective space, the height of a grid is maximized by cancelling a traditional structure that a middle pole is in bridged connection with a single battery, so that capacity maximization of the valve-controlled sealed battery within an effective volume is realized, and the volumetric specific energy of the storage battery is increased.

The invention relates to a manufacturing method of a lithium iron phosphate anode. The manufacturing method comprises the following steps: adding a polytetrafluoroethylene emulsion to an aqueous carboxymethyl cellulose solution, stirring, adding lithium iron phosphate and a conductive agent, stirring, adding water to form a slurry, shaping by coating the slurry, drying, and sintering in an inert atmosphere, and compacting by a roller press. By using the manufacturing method provided in the invention and utilizing an aqueous solution system to manufacture the anode of a cell, the pollution of NMP (N-methyl pyrrolidone) to the environment and harms of the NMP to human bodies are avoided, and the volumetric specific energy of the cell is increased.

The invention relates to a preparation method of a lithium ion batteries cathode material solid solution with a core-shell structure. The solid solution is prepared by a two-step coprecipitation method, a molecular formula of the core-shell structure is Li1+y[(Mn1/3Ni1/3Co1/3)x(Ni1/4Mn3/4)1-x]1-yO2. The method comprises the following steps: spherical [Mn1/3Ni1/3Co1/3]CO3 is synthesized in a stirring reactor through the coprecipitation method, then nickel salt and manganese salt are placed in a reactor according to mol ratio of 1: 3, then a [Mn1/3Ni1/3Co1/3]CO3 precursor with the core-shell structure is obtained through a secondary coprecipitation method, and the precursor and the lithium salt are mixed for calcination to obtain the lithium ion batteries cathode material solid solution with the core-shell structure. The obtained product has excellent electrochemistry property, the preparation method is simple, and is suitable for large scale industrial production.

The invention relates to a method for synthesizing a high-density lithium iron phosphate material, belonging to the technical field of cathode materials of lithium ion batteries. The method for synthesizing the high-density lithium iron phosphate material comprises the following technical steps of: 1, synthesizing pure-phase lithium iron phosphate: firstly, drying and dehydrating iron phosphate for 1-10 hours at the temperature of 200-700 DEG C, and uniformly mixing the dehydrated iron phosphate with metal lithium powder in the atmosphere of dry air or inert gas; and applying the pressure of 0.1-10MPa to the surface of an iron phosphate and lithium powder mixed material, and heating for 1-5 hours at the temperature of 300-400 DEG C in an air isolation way; 2, cladding a thin carbon layer: crushing lithium iron phosphate, and then immersing into a polyvinyl butyral/ethanol solution, wherein the concentration of the polyvinyl butyral is 1-20%, and the weight ratio of the lithium iron phosphate to the solution is 1:(1-10); and 3, baking and calcining: baking at the temperature of 100-120 DEG C, and calcining for 1-10 hours at the temperature of 500-600 DEG C. The method provided by the invention has the advantages of simple process and convenience for operation, and the high-density lithium iron phosphate material has the advantages of stable quality, high material packing density, low carbon content, high gram capacity, high energy density per unit volume and the like.

The invention relates to the field of metal-air batteries, particularly to a positive electrode material of a metal-air battery, a preparation method of the positive electrode material, the metal-airbattery and a preparation method of the metal-air battery. The positive electrode material of the metal-air battery comprises a metal mesh structure substrate, a photocatalytic active material layer covering the surface of the metal mesh structure substrate, and cocatalyst nanoparticles loaded on the photocatalytic active material layer. The metal-air battery and the positive electrode material thereof provided by the invention have the advantages of good stability, high battery efficiency, low charging overpotential, low battery cost, high volumetric specific energy and the like under the conditions of the same capacity and energy density, and are easy to realize combination of solar energy and an energy storage system.

The invention discloses a negative electrode binder for a lithium-ion battery, the negative electrode binder comprises the following components in parts by weight: 100 parts of halogenated styrene, 80-110 parts of 1,3-butadiene, 170-220 parts of deionized water, 0.4-1.5 parts of an emulsifier 1, 0.4-1.5 parts of an emulsifier 2, 0.8-3 parts of an initiator 1, 20-30 parts of a seed emulsion, 1-9 parts of a carboxylic acid monomer 1, 0.5-2 parts of a molecular weight regulator 1 and 0.1-2.7 parts of an alkaline substance. Compared with the prior art, a halogenated styrene-butadiene rubber emulsion binder for the negative electrode of the lithium-ion battery is prepared by polymerizing the halogenated styrene and the 1,3-butadiene to form a main body and matching the main body with other components, the polarity of a high polymer is improved and the cohesiveness is enhanced due to the existence of halogen atoms on a benzene ring; and thus, the binder has favorable mechanical properties and electrochemical stability.

This invention discloses the negative of a Li ionic secondary battery, its preparation method and the battery containing said negative, among which, the negative includes: rhombic black phosphorus with orthogonal structure applied by an inorganic solid electrolyte crystal film in 20-5000 artificially