126results about How to "Improve the first discharge capacity" patented technology

The invention discloses a modified high nickel ternary positive electrode material. The surface of a high nickel ternary positive electrode material is coated with a coating layer containing a fast ion conductor. The fast ion conductor has the chemical general formula of Li3x1La2/3-x1Ma1TiNz1O3, Li2+2x2Zn1-x2GeO4 or LiM'2(PO4)3, wherein M represents Ba<2+> and/or Sr<2+>, N represents Al<3+> and/orZr<4+>, x1 is greater than or equal to 0.04 and less than or equal to 0.167, a1 is greater than or equal to 0 and less than or equal to 1, z1 is greater than or equal to 0 and less than or equal to 1, x2 is greater than -0.3 and less than 0.8, and M' represents one or more of Zr, Ti, Ge and Hf. Compared with the existing positive electrode material, the modified high nickel ternary positive electrode material is provided with the coating layer containing the fast ion conductor and the coating layer can react with residual lithium on the surface of the material to reduce residual lithium on the surface of the material and inhibit side reactions of the residual lithium and the electrolyte so that material surface stability and cycle performances are improved. The modified high nickel ternary positive electrode material has good lithium ion deintercalation ability, improves the first discharge capacity of the material and first coulombic efficiency and has a good application prospect. The invention also discloses a preparation method of the modified high nickel ternary positive electrode material and a lithium ion battery.

The invention discloses an ultra-long single crystal V2O5 nano wire/graphene anode material and a preparation method, and belongs to the field of lithium ion battery electrode materials and preparation thereof. The V2O5 nano wire/graphene anode material consists of a two-dimensional graphene nano sheet and one-dimensional V2O5 nano wires, wherein the ultra-long single crystal V2O5 nano wires are regularly distributed on the surface and the interlayer of the transparent graphene nano sheet to form a sandwich structure. The preparation method comprises the following steps of: dispersing vanadium oxide powder and merchant graphite into deionized water, adding an oxidant, fully stirring mixture uniformly, performing ultrasonic treatment, putting the mixture into an autoclave, keeping the mixture for certain time at a certain temperature, and performing vacuum drying to obtain the ultra-long single crystal V2O5 nano wire/graphene composite anode material. The invention has the advantages that: the first discharge capacity, the magnification performance and the electrochemical cyclical stability of the composite anode material are remarkably improved. The method is simple, environment-friendly, convenient for operation and easy to realize large-scale production.

A method for preparing a ternary anode material of a long-service-life and high-capacity lithium ion battery and belongs to the technical field of material synthesis. The method comprises the following steps: weighing a lithium source and NixCoyMnz(OH)2, uniformly mixing, pre-burning at a temperature of 400-600 DEG C for 2-6 h, and forging at a temperature of 700-1000 DEG C for 6-16 h; uniformly mixing the ternary anode material, the lithium source and nanometer TiO2; forging at a temperature of 700-950 DEG C for 3-8 h to obtain the ternary anode material which is prepared by twice lithium adding and twice forging. The ternary anode material is prepared through twice lithium adding and twice forging, and the extra lithium source which is introduced through twice lithium adding and twice forging is electrochemically pre-embedded in an anode. Meanwhile, the Li+ diffusion rate can be effectively increased through the doping of Ti4+, and the irreversible capacity loss is reduced. In an interval of 2.3-4.6 V, a discharging platform is prolonged, and the first discharging capacity, the cyclic performance and the rate performance of the material are obviously improved. The method is simple, effective, economical and practical and has a remarkable industrial application effect.

The invention relates to a sodium doped lithium-rich manganese based cathode material for a lithium ion battery. The material is a sodium salt doped lithium-rich manganese based solid solution cathode material of which the general formula is xLi[Li1/3Mn2/3]O2.(1-x)LiNi0.2Co0.2Mn0.6O2, wherein x is equal to or greater than 0.4 and is equal to or less than 0.7, the doped quantity of sodium elements is 1-10% of the mol content of lithium elements, and the sodium salt is one selected from Na2CO3, Na2C2O4 and NaNO3. The mol content of ternary phase manganese of the sodium doped lithium-rich manganese based cathode material for the lithium ion battery is greater than 50%, and the manganese with high reserves and low price is used for replacing cobalt and nickel, so that the application cost can be reduced. Compared with the prior art, the sodium doping provided by the invention can improve the discharging specific capacity and the circulating stability of the rich lithium manganese based cathode material.

The invention discloses a preparation method for a waterborne polyurethane binder and a lithium-ion battery anode slurry containing the waterborne polyurethane binder, and relates to the technical field of lithium ions. The preparation method for the waterborne polyurethane binder comprises the following steps: subjecting macromolecular dihydric alcohol to dehydration treatment, mixing dehydratedmacromolecular dihydric alcohol with diisocyanate, carrying out a reaction under heating, then carrying out cooling, adding a side-chain type nonionic hydrophilic monomer, carrying out a reaction under heating, then carrying out cooling, adding a micromolecular chain extender, a catalyst and a solvent, carrying out a reaction under heating, and carrying out cooling and discharging so as to obtaina prepolymer emulsion; and adding water into the prepolymer emulsion, carrying out emulsification under high-speed dispersion, then adding a diamine chain extender, and carrying out pressure-reduced distillation to remove the solvent so as to obtain a waterborne polyurethane emulsion with a side-chain structure. The polyurethane binder prepared by using the preparation method provided by the invention has good flexibility and excellent bonding performance, and is used in an anode slurry; and a button type lithium-ion battery assembled by using the anode slurry has large first discharge capacity and good cycle performance.

The invention relates to a microwave synthesis method for a multi-element lithium manganate-doped positive electrode material of a lithium ion battery. The method comprises the following steps: adding deionized water into raw materials comprising lithium carbonate micropowder, industrial pure electrolytic manganese dioxide micropowder, analytical pure magnesium oxide micropowder, nickelic trioxide micropowder and chromic oxide micropowder to perform wet combination; mixing the raw materials with a ball mill; drying; mixing and sieving the dried products to serve as crude materials; shaping the crude materials into green bodies, and putting the green bodies into a microwave oven for sintering; and after the sintering is finished, taking the materials out, crushing and sieving the materials to obtain the lithium manganate-doped positive electrode material of the lithium ion battery. The material serving as a positive electrode active material can be used for preparing a positive plate of the lithium ion battery. The method has the characteristics of simpleness, energy saving and consumption reduction, low cost and contribution to industrial production; and the assembled lithium ion battery has the advantages of high initial discharge capacity and high charge and discharge cycling performance. The lithium manganate-doped positive electrode material of the lithium ion battery obtained by the method can be applied to electric automobiles, mobile phones, laptops and other equipment.

The invention provides a prussian blue positive pole material and a preparation method thereof, and an electrochemical energy storage device. The molecular formula of the positive pole material is AxMc[M'(CN)6]y, wherein the A is one or more of H<+>, Li<+>, Na<+>, K<+> and NH4<+>, the M is transition metal, and M' is also the transition metal, 0 < x <= 2, 0 < y < 1, and 0 < c <= 1. The positive pole material has a porous structure and a high specific surface area, so that the diffusion and transmission path of ions and electrons can be obviously shortened, both the ion and electron conductiveproperties of the electrochemical energy storage device can be enhanced, and therefore, the cycle performance and rate performance of the electrochemical energy storage device can be improved; and thecontact with a conductive agent can be also increased, the electron conductive properties of the electrochemical energy storage device can be further enhanced, and the cycle performance and rate performance can be further improved as well.

The invention is applicable to the field of lithium battery anode materials and provides a lithium battery nickel-cobalt lithium manganate ternary anode material and a preparation method thereof. The preparation method comprises the following steps: preparing two groups of nickel-cobalt lithium manganate materials of different nickel contents; preparing a coating material from an aluminum salt and sol with a coating element; uniformly mixing the two groups of the prepared nickel-cobalt lithium manganate materials according to a certain mass ratio, further mixing with the coating material, and sintering in a tank type furnace, thereby obtaining the nickel-cobalt lithium manganate ternary anode material. As the nickel-cobalt lithium manganate materials of different nickel contents are mixed, the specific capacity of the material is increased; and as the surface of the material is coated by the coating material with at least one element of Zr, Mg, Ti, Ce, La, Nb, Ba, V, Ni, Co, Mn and Al, the circulation property of the material can be improved. The material is simple in preparation process and is capable of ensuring excellent and stable product properties.

The invention provides a lithium-rich cathode material doped with lithium manganate at a Mn site, and a preparation method of the lithium-rich cathode material. The preparation method of the lithium-rich cathode material doped with the lithium manganate at the Mn site comprises the following steps: evenly mixing a lithium source, a manganese source, doped metal salt and a metal complexing agent, carrying out ultrasonic gas atomization on the obtained mixture, and calcining to obtain spherical lithium manganate powder; mixing the obtained spherical lithium manganate powder with a spherical cathode material, coating and calcining. The lithium-rich cathode material provided by the invention is prepared by doping the lithium manganate at the Mn site, thus effectively inhibiting oxygen evolution and solving the problem of voltage drop in a circulating process; the tap density of powder can be improved by mixing, so that the energy density of the material is further improved; due to the stepof coating, the loss of oxygen vacancies and the migration of transition metal ions are reduced; after the lithium-rich cathode material is adopted, the first time efficiency is increased, the safetyperformance of batteries is improved, and the energy density of the material is improved.

The invention discloses a lithium ion batteries cathode material and a preparation method thereof, and more specifically relates to the lithium ion batteries cathode material coated by orthosilicate and the preparation method thereof. A coating layer comprises the chemical composition of Li1+aMnbMcSiO4(M=Co, Ni, Fe, Mg, Al, Ti, Zr, and a is greater than or equal to -0.1 and less than or equal to 0.1, b is greater than 0 and less than or equal to 1.0, c is greater than or equal to 0 and less than or equal to 1.0). The cathode material has good overcharge resistance performance and thermostability. The preparation method is characterized in that orthosilicate and a salting liquid containing Mn(and M) are mixed to form sol, then a cathode material core is added, an orthosilicate coating layer containing Mn(and M) is formed on at least part of the surface of the cathode material core, and the lithium ion batteries cathode material can be obtained after heat treatment.

The invention relates to the field of lithium ion battery negative electrode carbon materials, particularly to a lithium ion battery negative electrode active material, a lithium ion battery negativeelectrode, a lithium ion battery, a battery pack and a battery power vehicle. According to the present invention, in the pore structure, measured through N2 adsorption and desorption, of the lithium ion battery negative electrode carbon particles, by using the total pore volume measured by BJH having a pore size of 2-200 nm as the reference, the sum of the volumes of pores with a pore size of 2-10nm is 5-10%, the volumes of pores with a pore size of 10-100 nm account for 50-65%, the volumes of pores with a pore size of 100-200 nm account for 30-40%, and the carbon particles have a BET specific surface area of 1-4 m<2>/g, preferably 1.4-1.9 m<2>/g. According to the present invention, the button cell made of the carbon particles has a charging capacity of 392-403.65 mAh/g and a discharge capacity of 360-373 mAh/g, and the discharge capacity at 5C rate is maintained at 1985.7-2029.8 mAh after the button cell is assembled into the columnar battery.

The invention discloses a lithium supplement additive and a preparation method thereof, and a lithium ion battery containing the lithium supplement additive. A lithium supplemental additive is a powerparticle, that median particle size D50 is greater than or equal to 0.1 mu m and less than or equal to 20 mu m, and the chemical formula is xLi 2O. YM. ZNaOb, wherein, y) 0, z) 0, 2x-Y-Z*a)0.1, b)0;M is one or more of Co, Mn and N is one or more of Co, Mn, Al and Ti. The lithium supplement additive is combined with metal lithium, Compared with organic lithium, organic lithium is more stable andsafer. When added in lithium ion battery, organic lithium can provide lithium source during the first charge, which can compensate the lithium consumption when the positive electrode and negative electrode form SEI film, improve the first discharge capacity, cycle performance and energy density, and is especially suitable for the negative electrode system with low first charge-discharge efficiency.

The invention discloses a preparation method for a rare-earth-doped high-compaction ternary positive material. The preparation method comprises the following steps: adding lithium carbonate powder into a star-shaped ball mill; adding an amides reagent solution of a rare earth oxide (R2O3) into the lithium carbonate powder; then adding a ternary precursor; selecting absolute ethyl alcohol as a liquid medium and carrying out ball milling for 90+/-30 minutes, wherein the mol ratio of Li/M(Ni+Co+Mn) is 1.05+/-0.02 and the mol ratio of R/M(Ni+Co+Mn) is 0.010+/-0.005; drying the materials which are subjected to the ball milling in vacuum; sintering for the first time; dispersing and grading the sintered materials and washing by de-ionized water; sintering for the second time and dispersing to obtain liquid-phase doped rare earth-ternary material powder; putting the powder into a permeation furnace; and expanding and permeating in N2 of 500-650 DEG C for 3-6 hours to obtain target grains. The prepared doped ternary material is compacted and the primary discharging capacity is obviously improved.

The invention discloses a modification method for natural graphite, modified natural graphite and an application of the modified natural graphite. The modification method for the natural graphite includes the following steps: S1, performing high-temperature treatment on the natural graphite in an air atmosphere to partially oxidize the natural graphite to obtain partially oxidized natural graphite; and S2, mixing the partially oxidized natural graphite and a liquid-phase coating agent, performing high-temperature carbonization treatment in an inert atmosphere, and performing graphitizing to obtain the modified natural graphite. The modified natural graphite prepared by the method has a simple production process, and a lithium ion battery anode material prepared from the modified natural graphite has the advantages of stable performance, low costs, and excellent cycle performance.

The invention discloses a pre-lithiated lithium ion positive electrode material and a preparation method and application thereof. The chemical formula of the lithium ion positive electrode material isLi2O/[A(3-x)Mex]1/3-LiAO2, A comprises M, and M is at least one of Ni, Co and Mn; Me is at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Ce, Cr, Zn or Fe; and 0 < x < 0.1. Multiple elements areco-doped and have a synergistic effect, so that irreversible phase change under high voltage is inhibited, and the structural stability of the base material is improved; the spinel phase A(3-x)MexO4 structure contains doping elements, the interfacial activity of the material is improved through combined action, and more electrochemical active sites are introduced.

The invention discloses a preparation method and application of a graphene/sulfur/prussian blue analogue composite material, and belongs to the field of preparation methods of lithium-sulfur battery materials. The preparation method comprises the steps: adding prussian blue analogue and sulfur powder into a certain volume of carbon disulfide solution, uniform stirring, evaporating the carbon disulfide solution to dryness at a certain temperature, centrifugally washing the obtained product with distilled water, and drying to obtain the sulfur/prussian blue analogue composite material; and diluting a graphene aqueous suspension with a certain concentration, ultrasonically dispersing for a certain time, adding a certain mass of sulfur/prussian blue analogue composite material, adding a certain volume of hydrazine hydrate, stirring for a certain time, washing the obtained product with distilled water, and carrying out vacuum freeze drying to obtain the graphene/sulfur/prussian blue analogue composite material. The first discharge capacity is as high as 850mAh/g; and the capacity can be kept at 900mAh/g under the multiplying power of 0.5 C, and the excellent multiplying power performance is realized.

The invention belongs to the field of lithium ion batteries, and relates to a lithium-intercalated metal oxide and a preparation method and application thereof. The preparation method of the lithium-intercalated metal oxide comprises the following steps: sequentially carrying out chemical corrosion crystallization reaction, magnetic separation, solid-liquid separation and washing on nickel-containing metal and/or nickel-containing metal oxide, an oxidant I, water and a complexing agent, pre-sintering the obtained nickel-containing metal hydroxide in an oxidizing atmosphere at the temperature of 180-350 DEG C for 2-10 hours, and sequentially carrying out lithium intercalation reaction, solid-liquid separation and calcination on the obtained nickel-containing precursor, an alkali metal compound, an oxidant II, water and an optional additive. The lithium-intercalated metal oxide prepared by the method provided by the invention is used as a lithium ion battery cathode material, so that thefirst discharge capacity and capacity retention rate of the lithium ion battery can be effectively improved. In addition, no wastewater is generated in the chemical corrosion crystallization reactionprocess, and water is continuously consumed, so that the purpose of environmental friendliness can be achieved.

The invention relates to the field of lithium-ion batteries and discloses a ternary anode material, a preparation method thereof and a lithium-ion battery containing the material. The process comprises the steps that a ternary anode material and conductive inorganic salt are mixed uniformly and dissolved in a solvent to obtain a first mixed solution, and the solvent in the first mixed solution isdried by distillation to obtain mixed powder; the mixed powder is calcined to obtain a calcination product containing ternary anode material particles coated with an inorganic lithium salt compound; an oxidant, conductive polymer monomers and the calcination product are dissolved in a solvent to obtain a second mixed solution, the conductive polymer monomers are subject to oxidative polymerizationto generate a conductive polymer, and the outer layer of the inorganic lithium salt compound of all the ternary anode material particles is coated with the conductive polymer; and the mixed solutionis filtered, washed and dried, and then the ternary anode material of the lithium-ion battery is obtained. The technical scheme is beneficial for suppressing side effects of an electrolytic solution on the surface of the high-nickel ternary anode material; the first discharge capacity of the lithium-ion battery is improved; and rate discharge and circulation properties of the high-nickel ternary anode material are enhanced.

The invention provides a lithium ion battery, and an anode material and a preparation method thereof. The anode material of the lithium ion battery is compounded by CeF3 and carbon and has a chemical formula of CeF3/C, the carbon is porous carbon, and the CeF3 is positioned in the pores of the porous carbon. The lithium ion battery comprises an anode plate, a cathode plate, an isolating membrane and electrolyte, wherein the anode plate comprises anode materials, the isolating membrane is positioned between the anode plate and the cathode plate, and the anode material is the anode material of the lithium ion battery. The anode material of the lithium ion battery has the advantages of high initial charge capacity, high initial discharge capacity, high initial coulombic efficiency and good cycle performance. The lithium ion battery has the advantages of high energy density, good safety performance and low cost.