209results about How to "Increase volume capacity" patented technology

This invention discloses the method for preparing high-density spherical lithium ferric phosphate used as the positive material of lithium ion cell, which contains synthesizing the ferric iron salt aqueous solution, phosphorus source aqueous solution and alkali aqueous solution to form spherical or spheroid ferric phosphate precursor, uniformly mixed with lithium source, carbon source and doped metal compound after being washed and dried, high temperature heat treating at 600-900 degree centigrade for 8-48 hr under inertia or reducing atmosphere protection to obtain lithium ferric phosphate with mean grain size of 7-12 micrometer,2.0-2.2g/cm3 of tap density, high buck density of 140-155mAh/g first discharge ratio capacity at normal temperature, and high volume ratio capacity.

The invention relates to a negative electrode material used for a lithium battery and a preparation method and application thereof, the negative electrode material includes a conductive substrate material layer and a silicon based thin film material layer, the silicon based thin film material layer contains one or more components selected from the group consisting of silicon element, SiOX and silicon alloy, wherein, 0 < X =< 2; in the silicon based thin film material layer, silicon accounts for 10-100% of the weight of the silicon based thin film material layer; the silicon based thin film material layer is a thin film formed by regular and/or irregular columnar and/or fibrous micro nano naps, wherein the micro nano naps are connected with each other by root parts, and the root parts of the micro nano naps are connected with the conductive substrate material layer; gaps are existed among the micro nano naps, and the porosity among the micro nano naps is 2%-98%; the diameter size of the micro nano naps is 1 nm to 10 mum, and the thickness of the silicon based thin film material layer is 50 nm-10 mum.

The utility model discloses a spherical hydroxyl nickel oxide cobalt manganese and the fabrication method, relating to the anode material of a lithium battery, and aiming to provide a spherical hydroxyl nickel oxide cobalt manganese and the fabrication method. The fabricated anode material of the lithium battery has the advantages of big tap density, good electrochemical activity, big specific volumetric capacity, low synthesis temperature and short reaction time. The key points of the technical proposal of the utility model are that: the general formula of the spherical hydroxyl nickel oxide cobalt manganese is Ni1-x-yCoxMnyOOH; the spherical hydroxyl nickel oxide cobalt manganese and the fabrication method comprise the following steps: (1)a mixed salt solution of nickel, cobalt and manganese is confected according to the ratio that Ni:Co:Mn=1:(1/5-2/5):(1/5-2/5); (2) an alkaline solution of two to ten mol/L is confected; (3) the mixed salt solution of nickel, cobalt and manganese, the alkaline solution and the ammonia are conducted to an reaction kettle; (4) the intermediate products are added to the reaction kettle according to the solid-liquid ratio of 1:2 to 10, and reacted with the oxidant to produce the utility model. The utility model is used as the anode material of lithium batteries.

The invention relates to a preparation method for iron oxide/carbon composite material. The preparation method comprises the steps as follows: 1, taking a water-soluble iron salt as an iron source, taking a water-soluble organic carbon source as a carbon source, and uniformly mixing the iron salt water solution, ammonia water with the organic carbon source to form a liquid phase mixture; 2, performing spray drying, freeze drying or spray pyrolysis on the liquid phase mixture to form a powder precursor, and performing calcination on the precursor to prepare into the iron oxide/carbon composite material; or performing spray pyrolysis on the mixed solution directly to prepare into the iron oxide/carbon composite material. The preparation method for the iron oxide/carbon composite material, which is provided by the invention, is high in production efficiency and suitable for large-scale production; the utilization efficiency of the composite material is improved; the iron oxide/carbon composite material provided by the invention is taken as the anode material of a lithium ion battery, so that the lithium storage capacity of the anode material of the lithium ion battery is several times as much as that of commercial carbon anode material.

The invention relates to a preparation method of an isotropous graphite secondary particle. The preparation method comprises the following steps: 1, mixing initial carbon material particles with modified asphalt particles to obtain a powder mixture with the initial carbon material particles as a continuous phase and the modified asphalt particles as a dispersion phase; 2, carrying out hot isothermal pressing treatment of the powder mixture, and removing the initial carbon material particles unbonded by the modified asphalt to obtain an isotropous graphite secondary particle precursor; and 3, sequentially carrying out heat treatments comprising non-melting treatment, charring treatment and graphitization treatment of the isotropous graphite secondary particle precursor. The isotropous graphite secondary particle macroscopically has the isotropy, can maintain the specific mass capacity of a cathode material, and simultaneously solves problems comprising low compacted density of a graphite cathode material piece and large baking expansion rate after the compacting of the piece, so the specific volume capacity of a lithium ion battery is improved.

The invention discloses a multielement-doped lithium iron phosphate positive electrode material and a preparation method thereof. The general formula of the multielement-doped lithium iron phosphate positive electrode material is Li1-xAxFe1-y-zNbyMzPO4, wherein x, y and z are more than zero and not more than 0.1. The preparation method comprises the following steps: mixing lithium source, iron source, phosphorus source, compound of A and carbon source, roasting at 400-800 DEG C, then quickly reducing the temperature to room temperature, crushing, grinding to obtain an intermediate, then mixing the intermediate with niobium compound, compound of M and carbon source, roasting at 400-850 DEG C, then quickly reducing the temperature to room temperature, grinding, and grading to obtain the product. The preparation method of the invention can obviously increase the tap density of the material; and the material can have higher specific capacity and volume specific capacity and excellent cycle performance, meanwhile the material is applicable to industrialized stable production and has wide application prospect in the battery positive electrode material field for energy sources.

The invention discloses a continuous rolling process for a lithium-ion battery electrode and a device thereof. The process is characterized in that an electrode plate adopts a low-temperature hot rolling process. The used device is characterized in that a heating device is increased between an unrolling shaft and a roll. The process has the advantages of ensuring the dryness of the electrode, increasing the plasticity of the electrode plate, reducing the rebound rate of the rolled electrode plate and properly increasing the single-side density of the electrode plate, thereby promoting the volume rate capacity of the battery; and the device has a simple structure and convenient operation.

A polymer electrolyte isolating membrane, preparation method and use thereof, relating to a polymer electrolyte isolating membrane, preparation method and use thereof. The invention solves the problem in the current lithium ion battery liquid electrolyte that is easy to leak and hard to shape the gel state electrolyte and has bad safe performance and mechanical performance. The polymer electrolyte isolating membrane is made of a lithium salt, an organic solvent, a photosensitive monomer, a photoinitiator and a nano-filler. The method includes the steps as follows: adding the lithium salt into the organic solvent, magnetically stirring them to obtain the electrolyte solution; adding the photoinitiator into the photosensitive monomer, magnetically stirring them to form a mixed monomer; adding the electrolyte solution and the nano-filler into the mixed monomer; ultrasonically shaking them to obtain the mixed solution; coating the mixed solution on the surface of the release material; radiating on the surface of the release material coated with the mixed solution via an ultraviolet light to obtain the polymer electrolyte isolating membrane. The polymer isolating membrane of the invention has the advantages of good mechanical performance, easy formation, high conductivity and good battery performance after the battery is assembled.

The invention provides a Si-TiO2-C nano fiber composite thin film, a preparation method and an application thereof. The preparation method for preparing the Si-TiO2-C nano fiber composite thin film includes following steps: (1) providing a spinning liquid which contains nano silicon powder, a titanium precursor and a carbon precursor; (2) performing electrostatic spinning to the spinning liquid to prepare a nano fiber film; (3) pre-oxidizing the nano fiber film under an oxygen-containing atmosphere at 100-300 DEG C to obtain a stabilized nano fiber film; and (4) carbonizing the stabilized nano fiber film under an non-oxidizing atmosphere at 500-1000 DEG C to obtain the Si-TiO2-C nano fiber composite thin film. By means of the method, the Si-TiO2-C nano fiber composite thin film can be prepared quickly and effectively. The preparation method is simple in operations, is convenient and quick, and can easily achieve large-scale production.

A silicon negative electrode of a lithium ion secondary battery comprises a conductive matrix and a material layer loaded on the surface of the conductive matrix, wherein the material layer is composed of a carbon material layer and a silicon layer; the carbon material layer is attached to the conductive matrix; and the silicon layer is attached to the carbon material layer. The battery prepared by the silicon negative electrode has both the higher volume ratio capacity and the favorable circulation performance.

The invention discloses a preparation method of a high-density non-ball shape ferric phosphate powder body which relates to a ferric compound. The invention aims to provide the preparation method of a high-density non-ball shape ferric phosphate powder body, and the ferric phosphate prepared by the method has high jolt density, small granule size and high specific surface area. The adopted technical scheme is as follows: a mixed water solution with a certain concentration of (FeNO3)3.9H2O and H3PO4 is prepared, (the mole ratio of Fe and P is 0.9:1.0); the mixed water solution is placed into a reactor, an ammonia solution is gradually added under a certain temperature and agitation until the pH value of the reaction liquid reaches 1 to 4 to obtain ferric phosphate slurry; the slurry is injected into a plate and frame filter press to obtain a filtered cake by pressing and filtration, the filtered cake is dried, soluble impurity ions are removed by water washing, and the washed material is dried again, pulverized and sieved to obtain the ferric phosphate powder body. The invention is used for the anode material of lithium ion batteries.

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 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 sintering method comprises the step: the mixture that contains lithium compound, iron compound, phosphorus compound and partial 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 residual carbon source additive is sintered at a second constant sintering temperature, and the second sintering temperature is at least 100 DEG C higher than the first sintering temperature. The batteries made of the lithium iron phosphate prepared by the method of the invention have markedly improved discharge performance at high current.

The invention relates to an acid single flow cell which can be applied to large-scaled energy storage and power generation. The cell comprises an electrolyte storage tank, a cadmium or indium deposited cathode current collector and a lead dioxide anode; an acid solution of soluble cadmium salt or indium salt is used as an electrolyte; and when the cell is charged, the cadmium or indium ions are deposited on the cathode current collector from the electrolyte, and when the cell is discharged, the metal cadmium or indium is dissolved in the electrolyte from the cathode current collector. The current cell has the advantages of simple structure, convenient preparation, high electric energy conversion efficiency, long cycle life, environmental protection, safe use, and the like.

The invention relates to preparation methods for lithium iron phosphate, in particular to a preparation method for lithium iron phosphate materials with high tap density. The preparation method for the lithium iron phosphate materials with the high tap density mainly solves the technical problems that in the prior art, lithium iron phosphate materials are low in tap density, small in volume capacity ratio, not prone to be widely used and the like. The preparation method comprises the steps of mixing lithium salt, ferric salt and phosphor salt, adding a doped modifying agent and a carbon source, carrying out wet process ball milling in a ball milling machine, carrying out spray drying, pre-sintering a dried precursor in inertia or reducing atmosphere, after preserving temperature, cooling to the room temperature along with a furnace, obtaining a pre-sintered product, sintering the pre-sintered product in an inertia or reducing atmosphere protective furnace at a high temperature, cooling to the room temperature along with the furnace, obtaining LiFePO4/C, placing the LiFePO4/C into a rotation type fusion balling machine for processing, and finally preparing the finished product of the lithium iron phosphate materials with the high tap density.

The invention provides positive slurry of a lithium ion battery as well as a preparation method and application of the positive slurry of the lithium ion battery. The preparation method of the positive slurry of the lithium ion battery comprises the following steps: (1) uniformly agitating and mixing a solvent and an oily binding agent to obtain a mixture A; (2) adding graphene into the mixture A at 25-40 DEG C and agitating uniformly to obtain a mixture B; and (3) adding nickel cobalt lithium aluminate powder into the mixture B; agitating to obtain the positive slurry; and during the agitating period, adding oxalic acid to adjust the pH value of the slurry to 8-9.5. The battery prepared from the positive slurry of the lithium ion battery has the excellent charging/discharging circulating service life and has the high power and safety performance. The battery prepared by the invention is applicable to the fields of hybrid electric vehicles, telecommunication networks, outer spaces, defending equipment and the like.

The invention relates to a battery cover plate with novel structure and a secondary battery thereof. The battery cover plate comprises a plate body with via-holes, positive/negative electrode connectors, positive/negative conductive sheets, an anti-explosion device and insulating gaskets arranged on the via-holes, wherein the positive/negative electrode connectors are respectively fixed on the plate body through respective insulating gaskets; the positive/negative conductive sheets are respectively connected with each electrode connector and fixed below the insulating gaskets; the electrode connector comprises two or more fasteners, an electrode press plate with fixing holes identical to the fasteners in number, and screw-thread connectors arranged on the electrode press plate for conductive connection; the via-holes on the plate body correspond to the fixing holes on the electrode press plate; and the fasteners penetrate through the via-holes and the fixing holes to fix the electrode press plate on the plate body. The battery cover plate and the positive/negative electrode connectors on the secondary battery of the invention have more stable sealing performance, more flexible external connection, maintenance and disassembly and more convenient usage.