127results about How to "Reduce shuffling" patented technology

The invention discloses a high-energy-density Ni-Co-based lithium ion positive electrode material. The chemical general formula of a base material is LipNixCo1-xMmO2, M is a doping agent, and a clad material is an active material N; a positive electrode material of a lithium ion secondary battery is composed of second particles formed by gathering of primary particles, or primary particles, or mixed particles of primary particles and second particles. A preparation method of the high-energy-density Ni-Co-based lithium ion positive electrode material comprises the steps of preparation of a precursor of the lithium ion secondary battery positive electrode material and preparation of the lithium ion secondary battery positive electrode material. The Ni-Co binary precursor of the positive electrode material is subjected to a continuous coprecipitation reaction, elements are evenly mixed, the reaction is sufficient, and morphology control is facilitated; the cation mixing phenomenon is reduced through doping of proper elements in a binary high-nickel material, the structure is stabilized, safety and high-temperature performance of the battery material are improved, and the cladding active material improves first-time charge and discharge efficiency and the energy density of the material to a certain extent.

The invention discloses a method for preparing a high-nickel cathode material for a lithium secondary battery. The method comprises the steps of weighing and uniformly mixing a nickel-cobalt-manganesecompound, a lithium salt and an additive I; calcining the mixture in two stages at high temperature in an oxygen atmosphere; cooling, sieving, water-washing the mixture; and mixing the mixture with an additive II for secondary sintering so as to obtain the high-nickel ternary cathode material, wherein the lithium salt is a mixed lithium salt of lithium carbonate and lithium hydroxide, and the lithium carbonate and the lithium hydroxide can be mixed in any mixing ratio. The method can prepare a material having a large capacity and excellent cycle performance, can reduce the amount of highly-corrosive lithium hydroxide, improves the preparation environment of high-nickel materials, cancels out the impact of lithium hydroxide price fluctuation on the price of the high-nickel ternary material, and has a good application prospect.

The invention relates to a high-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material, and preparation methods therefor. The chemical formula of the high-nickel-material-based cobalt-magnesium co-doped modified positive electrode material is Li(Ni<x>Co<y>Mg<z>)O<2>, wherein x+y+z is equal to 1; x is greater than or equal to 0.85; y is greater than or equal to 0.05 and less than or equal to 0.14; z is greater than or equal to 0.01 and less than or equal to 0.1; and the positive electrode material belongs to the field of an electrode material of a lithium ion battery. A nickel-cobalt-magnesium mixed solution, a mixed solution of ammonium hydroxide and sodium hydroxide, and a sodium hydroxide solution are in parallel flow and are added to a reaction kettle to be subjected to a coprecipitation reaction to obtain precursor powder; then the nickel-cobalt-magnesium ternary positive electrode material is obtained; the non-electrochemical active Mg<2+> has a ''supporting column stabilizing effect'', and can stabilize a layered structure, reduce mixed arrangement of Ni<2+> and Li<+> and effectively improve the structural stability and electrochemical performance of the material; and the high-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material have the advantages of simple operation, continuous batch production, high discharging capacity, high cycling performance and the like, as well as high economic value and wide application prospect.

The invention discloses a multi-element mixed doping and coating modified ternary positive electrode material and a preparation method thereof. According to the lattice structure characteristics of ternary positive electrode materials, two kinds of metal ions with different ionic radii are doped selectively by multi-element mixed doping method. One kind of metal ions with lithium ion radius equalto or close to lithium ion radius can reduce the cation mixing and discharging. The other kind of metal ions with the same or close radius as transition metal ions (Mn4 +, Co3 +) can reduce the polarization and enhance the electrochemical performance. At that same time, a protective layer is coated on the surface of the ternary positive electrode material by a secondary sinter process to prevent the dissolution of transition metal ions on the surface of the ternary positive electrode material, thereby the ternary positive electrode material with excellent rate performance and cycling performance is prepare. The method is simple in process, convenient in operation and good in reproducibility, and is suitable for large-scale industrial production.

The invention discloses a metallic oxide-coated modified doped ternary anode material and a preparation method thereof. The anode material is represented by Li (Ni0.5Mn0.3Co0.2)(1-x)SrxO2.mAl2O3, and comprises a substrate and a coating layer coating the outer part of the substrate, wherein the substrate is represented by Li(Ni0.5Mn0.3Co0.2)(1-x)SrxO2; the coating layer is Al2O3. The anode material is prepared through combining the solid phase method with the heterogeneous nucleation method. The metallic oxide-coated modified doped ternary anode material provided by the invention has higher electronic conductivity and cycling stability, the surface is uniformly and completely coated, and the preparation method is easy, controllable, low in cost and suitable for large-scale industrial production.

Method for controlling output torque (Teng) of a propulsion unit in a vehicle powertrain including driven wheels drivingly connected to the propulsion unit via a mechanical transmission with a drive shaft, wherein the method including the steps of registering driver torque demand (Td) for vehicle propulsion, registering propulsion unit rotational speed (ωe), and controlling the output torque (Teng) of the propulsion unit to asymptotically follow the driver torque demand (Td) using a closed-loop linear-quadratic regulator (LQR) based controller (9) having the driver torque demand (Td) and the propulsion unit rotational speed (ωe) as input data, in order to minimize driveline oscillations.

The invention belongs to the technical field of battery materials, and discloses a preparation method of an aluminum oxide coated lithium nickel manganese cobalt cathode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering, coating and size stabilization treatment, wherein the step of raw material mixing comprises the steps that a three-dimensional efficient titled mixer is adopted, polyurethane balls serve as a mixing medium, dispersing, even mixing and smashing are conducted on lithium carbonate, a nanometer spherical nickel cobalt manganese hydroxide precursor and polyethylene glycol, and a uniform intermediate mixture is formed. The preparation method of the aluminum oxide coated lithium nickel manganese cobalt cathode material is low in primary sintering temperature, short in sintering time, simple in technology, large in specific capacity and good in cycling performance. The preparation method further has the advantages of being low in investment, reliable in technology, low in operating cost and the like, and the good economic benefit and market promotion value are achieved.

The invention provides a sodium ion doped high-nickel ternary lithium battery positive electrode material and a preparation method. The preparation method comprises the following steps: preparing an 811-type NCM (Nickel Cobalt Manganese) ternary positive electrode precursor through a co-precipitation method; after drying and grinding the precursor, mixing the ground precursor with powdery sodium peroxide and lithium oxide; pre-firing and sintering under an oxygen-rich environment to prepare the sodium ion doped high-nickel ternary lithium battery positive electrode material. According to the method provided by the invention, the defects that Ni<2+> is difficulty effectively controlled to be released from and embedded into a lamellar structure in a sintering process so that a structure is changed in a desorption process and the capacity of lithium ions is reduced are effectively overcome; sodium peroxide is changed into a molten state in a pre-firing process and permeates into the precursor, so that the Ni<2+> is oxidized into Ni<3+>; meanwhile, a lithium layer is occupied and an interlayer structure is expanded; the Ni<2+> is prevented from being migrated into the lithium layer ina sintering process; technical effects that nickel and lithium mixed arrangement of the high-nickel NCM positive electrode material is reduced, the migration rate of lithium ions is improved and the circulating performance of the battery is improved are realized.

The invention discloses a doped and coated dual-modified lithium / sodium layered metal oxide positive electrode material and a one-step synthesis method therefor. The ion-doped and interface-coated lithium / sodium layered metal oxide positive electrode material is synthesized by adopting a solvent-thermal treatment process / solid-phase ball milling process, wherein the doped ions are one or more than one kinds of F<->, Mg<2+>, Cu<2+>, Zn<2+>, Al<3+>, Fe<3+>, Cr<3+>, Ti<4+>, Zr<4+>, Mo<4+>, Sb<5+> and V<5+>; and the interface coating material is an ion compound which comprises lanthanide series or actinium series ions with radiuses greater than or equal to 1.016<angstrom>. By abandoning the idea that an ion-doped positive electrode material sample is prepared firstly and then interface coating is performed in the conventional process, the new method for the doped and coated dual-modified lithium / sodium layered metal oxide positive electrode material is developed through one-step synthesis, and the new method has the characteristic of simple process; and in addition, the electrochemical performance of the dual-modified positive electrode material is greatly improved, so that the positive electrode material can be used for a power battery and an energy storage secondary battery.

The invention provides a modification method of a lithium nickelate, cobaltate and manganate ternary material. The method comprises the step that after a lithium nickelate, cobaltate and manganate material is subjected to vapor phase deposition under the conditions of carbon source gas and protective gas, a carbon-coated modified lithium nickelate, cobaltate and manganate material is obtained. The modification method provided by the invention has the benefits that carbon deposits on the surface of the lithium nickelate, cobaltate and manganate ternary material through a vapor phase deposition method, so that carbon coating is realized; by adopting simpler processes, with the aid of the protective gas, the ternary material is carbon-coated, so that the problem of lithium nickelate reduction in the coating process of a traditional ternary material is effectively solved, and the coating of a carbon layer on the surface of the ternary material is realized; through the lithium nickelate, cobaltate and manganate ternary material coating carbon, the first-time charging and discharging efficiencies are improved, the lithium ion diffusion coefficients and the electronic conductivity of the material are improved, and the electrochemical performance of the NCM material is improved. According to the modification method provided by the invention, equipment is relatively simple, the process is less, and the structure is controllable; the material has higher battery capacity, cycle performance and rate capability.

The invention is suitable for the field of positive electrode materials for lithium batteries and provides a preparation method of a ternary material with a high cycle and a stable structure. The method comprises the steps of mixing nickel-cobalt-manganese ternary material precursors with different particle sizes with a lithium source separately and doping an F salt, a Co salt and an oxide of Si to obtain ternary materials with different median particle sizes; mixing the ternary materials with different median particle sizes at a ratio; and coating the mixed material with lithium silicate to obtain the final nickel-cobalt-manganese ternary material with the high cycle and the stable structure. High material density and high capacity can be achieved by using the precursors with different particle sizes; the structure of the material is stabilized, the conductivity of the material is improved and the cycle performance of the material is improved by using the characteristic of reducing cation mixing through doping of different ions; a lithium silicate protection film can be finally formed on a surface layer of the material through coating the material with the lithium silicate; and the conductivity of the material is improved and the structure of the material is stabilized.

The invention provides a preparation method of a high-nickel ternary material. The high-nickel ternary material is Li<1+a>Ni<x>Co<y>M<z>O<2+b>, wherein a is greater than or equal to -0.10 and less than or equal to 0.50; x is greater than or equal to 0.8 and less than 0.9; y is greater than or equal to 0.1 and less than or equal to 0.25; z is greater than or equal to 0 and less than or equal to 0.25; b is greater than or equal to -0.05 and less than or equal to 0.10; M is at least one kind of Mn, Al, Ti, Ba, Sr, Mg, Cr, Zn, V and Cu; the preparation method comprises the steps of enabling a precursor and a lithium source to be mixed, and adding sintering auxiliaries to be mixed uniformly, and then performing sintering in a three-stage sintering mode, wherein the three-stage sintering mode iscarried out by performing sintering in the first stage, then performing sintering in the second stage and finally performing sintering in the third stage, and the sintering temperature in the secondstage is higher than that in the first stage and in the third stage. By adoption of the three-stage sintering mode, and by enabling the sintering temperature in the second stage to be higher than thatin the first stage and in the third stage, the prepared high-nickel ternary material is high in crystallinity and less in Li / Ni mixed arrangement, thereby realizing high structural stability, high initial efficiency and high power.

The invention relates to a preparation method for a dynamic NCM (nickel-cobalt-manganese) anode material. The invention belongs to the technical field of anode materials for lithium ion batteries. The preparation method includes: (Step 1) preparation of precursor NixCoyMnzM1-x-y-z(OH)2 (M is one or both of Al and Y): (1) NiSO4.6H2O, CoSO4.7H2O, MnSO4.H2O, Al(NO3)3.9H2O and Y(NO3)3.6H2O are weighed to prepare mixed salt solution; an NaOH precipitant and an ammonia complexing agent are mixed; (2) two solutions converge to react, so that NixCoyMnzMl-x-y-z(OH)2 suspension is obtained; (3) a solid and liquid are separated, and a filter cake is dried; (4) a magnetic substance is removed; (Step 2) lithium-containing sintering for the first time: Li2CO3 and NixCoyMnzMl-x-y-z(OH)2 powder are weighed, mixed and sintered; (Step 3) liquid phase coating of 0.5wt percent of Al(NO)3: Al(NO3)3 solution is prepared, a pH value is regulated by ammonia, and Al(OH)3 is coated by a liquid phase; suspension is filter-pressed, and a filter cake is dried; (Step 4) lithium-containing sintering for the second time: Li2CO3, an Al(OH)3-coated first sintered material and TiO2 are weighed, mixed and sintered; (Step 5) a magnetic substance is removed, and thereby the finished dynamic NCM anode material is obtained. The preparation method has the advantages of simple process, low material cost, good comprehensive electrochemical properties, suitability for mass operation and the like.

The invention discloses a high-capacity nickel-cobalt-based lithium ion positive electrode material. The positive electrode material of a lithium ion secondary battery consists of secondary particles formed by aggregating primary particles or the primary particles or mixed particles of the primary particles and the secondary particles. The preparation method comprises the following steps: preparing a precursor of the positive electrode material of the lithium ion secondary battery and preparing the positive electrode material of the lithium ion secondary battery. According to the positive electrode material disclosed by the invention, a nickel-cobalt binary precursor is subjected to continuous co-precipitation reaction, elements are uniformly mixed, the reaction is full, and the morphology is beneficial to be controlled. Moreover, the continuous production is realized, the production efficiency is improved, and the granularity tends to be uniform. According to the binary high-nickel material, the proper elements are doped and coated, the cation mixing phenomenon is reduced, the structure is stabilized, the electrochemical performance of the battery is improved, and the safety performance and high-temperature performance of the battery material are improved.

The invention provides a metal vanadate compound co-doped high-nickel ternary precursor and a preparation method thereof. A metal vanadate compound is doped in the coprecipitation reaction process, sothat one or two or more metals are synergistically doped to modify a nickel, cobalt and manganese or aluminum ternary precursor material; in the preparation process, a complexing agent solution and ametal solution are equally divided into an upper liquid inlet pipe and a lower liquid inlet pipe, and added into a reaction kettle; different regulation and control modes and growth process parameters are adopted in different stages of precursor growth; the ternary precursor with special primary particle morphology such as a flower sheet shape, a slender spindle shape, a thick and short rod shapeand the like or loose, porous, dense, hollow and other section morphology inside can be prepared, and the requirements of lithium batteries with different properties on precursors with different physical properties can be met.

The invention discloses a coated ternary positive electrode material and a preparation method and application thereof. The coated ternary positive electrode material comprises a ternary positive electrode material and a lithium-and-tantalum-containing coating layer coated on the surface of the ternary positive electrode material. According to the preparation method, a tantalum compound is used asa coating raw material to coat a ternary material containing residual alkali on the surface, the residual alkali reacts with the tantalum compound to form the lithium-and-tantalum-containing coating layer on the surface of the ternary positive electrode material, so that the coated ternary positive electrode material is obtained, and the residual alkali comprises Li2CO3 and / or LiOH. By adopting the preparation method disclosed by the invention, the electrochemical properties such as rate capability and cycle performance of the material can be improved while the solubility of residual alkali and the material is reduced.

The invention discloses an aluminum-coated nickel cobalt magnesium lithium cathode material and a preparation method thereof. The aluminum-coated nickel cobalt magnesium lithium cathode material has a chemical formula as follows: Al2O3 [Li1+zNixCoyMg-(1-x-y)O2], in which z is more than or equal to 0 and less than or equal to 0.15, x is more than or equal to 0.7 and less than or equal to 0.85, y is more than or equal to 0.1 and less than or equal to 0.2, and x plus y is less than 1. The preparation method of the aluminum-coated nickel cobalt magnesium lithium cathode material comprises the following steps: mixing, sintering, performing aluminum coating, and secondarily sintering. Nickel, cobalt, magnesium and aluminum compounds are taken as raw materials, thus reducing influence of other anions, stabilizing a layered structure of LiNiO2 and reducing cation shuffling; the aluminum-coated nickel cobalt magnesium lithium cathode material is high in specific capacity, high in first charge and discharge efficiency, good in cycle performance, excellent in high-temperature performance and good in safety; and the preparation method of the aluminum-coated nickel cobalt magnesium lithium cathode material is simple in process, the production process is easy to control, large-scale production is easy to realized, the production cycle is short, the cost is low, no waste water or waste gas is produced in the whole process, and the preparation method is environment-friendly.

The invention discloses a preparation method of a modified high-nickel ternary positive electrode material, which comprises the steps of uniformly mixing a nickel-cobalt-manganese hydroxide precursor with a lithium source and a magnesium source, and carrying out two-stage sintering to obtain a magnesium-doped ternary high-nickel positive electrode material; and dispersing the magnesium-doped ternary high-nickel positive electrode material in an organic solvent, then adding a vanadium source and a lithium source, uniformly stirring, heating, evaporating to dryness, drying, and sintering at high temperature to obtain the lithium vanadate-coated magnesium-doped high-nickel ternary positive electrode material. According to the modified high-nickel ternary positive electrode material disclosed by the invention, the cycle performance and the rate capability of the material can be synergistically improved due to the high-nickel ternary positive electrode material is subjected to double modification treatment of magnesium ion doping and fast ion conductor coating.

The invention relates to an NCM ternary cathode material with surface layer doping of Ce<3+> and surface layer coating of CeO2 and a preparation method of the ternary cathode material, and belongs tothe field of chemical energy storage battery. The material has the chemical formula of wCeO2-Li[Ni<1-x-y-z>MnxCoyCez]O2, wherein 0.8 < 1-x-y-z < 1, 0 < x+y+z < 0.2, 0.005 <= w+z <= 0.03. Cerium nitrate and the NCM ternary cathode material are subjected to supersonic treatment in ethanol for 1-2 h and then are uniformly ground; the mixture is calcined at 500-750 DEG C for 4-6 h and then is cooled in the furnace. In the material, Ce<3+> can stabilize the layered framework of the NCM ternary cathode material for reducing mixed arrangement of Li<+> / Ni<2+> in the surface layer of the cathode material. By surface coating of the CeO2, an electrolyte / electrode interface structure is stabilized. The NCM ternary cathode material is significantly improved in rate capability and cycling stability.

The invention relates to the technical field of preparation of raw materials of a lithium ion battery ternary positive electrode material, in particular to a preparation method of a nickel cobalt manganese precursor with a special internal structure. A reducing agent is added into a base solution, Mn<3+> which is partially oxidized is reduced into Mn<2+>, oxidation in the period of crystal nucleusformation is reduced, the crystallinity degree of the crystal nucleus is increased, the internal structure arranged regularly is synthesized, and the special internal structure arranged radially fromthe centers of the granules to outside is formed. The internal structure is arranged directionally to a certain degree, energy required by lithium ion diffusion can be reduced, the Li<+> diffusion coefficient is increased, lithium ion diffusion and disembedding are benefited, and lithium nickel mixed discharge is reduced, so that the sintered positive electrode material has high capacity retaining rate and cycling performance.

The invention belongs to the technical field of preparation of lithium batteries and in particular relates to a preparation method of a lithium manganate cladded high-nickel ternary lithium battery positive electrode material. The preparation method comprises the following steps: carrying out ball milling on an NCM811 precursor, Mn2O7 and Na2S2O8; oxidizing the NCM811 precursor into NCMOOH and covering the surface of the NCMOOH with MnO2 and Na2SO4 formed by reducing the Mn2O7; washing through absolute ethyl alcohol to remove the Na2SO4 and the Na2S2O8; absorbing water and acid in a decomposedproduct through the Mn2O7 and surface residual alkali respectively, so as to form an MnO2 cladded NCMOOH material; adding a lithium source and sintering to form a LiMn2O4 cladded NCM811(LiNi0.8Co0.1Mn0.1O2) positive electrode material. An oxide layer on the surface and the lithium source are combined to form a lithium manganate cladding layer, so that the capacity of lithium ions is improved andthe stability of an NCM material is improved.

The invention belongs to the technical field of lithium battery material and discloses a preparation method of a spherical lithium nickel cobalt manganese oxide precursor mixture. The preparation method comprises raw material pretreatment, wet synthesis, aging after reaction, and spray pyrolysis secondary granulation. The prepared product is the micron-scale secondary spherical lithium nickel cobalt manganese oxide precursor mixture comprising a plurality of nano spherical particles. The precursor mixture has the medium particle diameter of 9-13[mu]m, the iron conductivity of 20-100 [mu]S / cm and the tap density not less than 2.00g / cm<3>. The preparation method has the advantages of small investment, reliable technology, low running cost and the like and therefore has excellent economic benefit and market popularization value.

The invention discloses a preparation method of a nickel-rich cobalt-free single crystal positive electrode material of a lithium ion battery, and belongs to the field of positive electrode materials of lithium ion batteries. The preparation method comprises the steps of preparing a nickel-rich cobalt-free hydroxide precursor through coprecipitation; uniformly mixing the precursor, molten salt and lithium salt according to a certain stoichiometric ratio, then calcining at high temperature, washing the obtained mixture with deionized water for multiple times, and drying to obtain lithium-deficient single-crystal-morphology spinel-like nickel-rich primary particles; and then supplementing a certain amount of lithium salt into the primary particles, uniformly mixing, and sintering at high temperature to obtain the single-crystal nickel-rich cobalt-free layered positive electrode material. The method is suitable for preparing the single crystal nickel-rich positive electrode material, lithium is added in the first step, the molar ratio Li / (Ni + Mg + Fe + Ti) of the lithium element to the sum of nickel, magnesium, iron and titanium is 0.8-1.0, micron-sized lithium-deficient spinel type nickel-rich single crystal particles are formed after sintering, the micron-sized large-size nickel-rich layered single crystal positive electrode material can be formed in the low-temperature range of 650-800 DEG C after water washing and lithium supplementation, the tap density is high, the lithium-nickel mixed arrangement is low, and the layered structure is good, so that the specific capacity is higher, and the cycle performance is good.

The invention discloses a preparation method of a LiMn1-x-yNixCoyO2 ternary positive electrode material, and belongs to the technical field of energy materials. The preparation method comprises the following steps: (1) adding a lithium source, a nickel source, a cobalt source, a manganese source and a compound containing oxalates into a complexing agent solution, mixing until solving completely to obtain a mixed solution; (2) standing the mixed solution, and performing freezing crystallization to obtain flocculent precipitation; and (3) filtering the flocculent precipitation, washing, drying to obtain a precursor, calcining the precursor, and cooling with a furnace so as to obtain the ternary positive electrode material. The method can be used for improving the charge-discharge specific capacity, the rate capability and the cycle performance of the ternary positive electrode material obviously.

The invention provides a high-compactness monocrystalline ternary cathode material, as well as a preparation method and application thereof. The preparation method comprises the following steps: sintering small-particle ternary precursor NixcOYmN(1-x-y)(OH)2 having the granularity D50 being more than or equal to 1.5 mu m and less than or equal to 5.5mu m, and breaking to obtain small-particle monocrystalline ternary oxide; sintering big-particle ternary precursor having the granularity D50 being more than or equal to 11mu m and less than or equal to 15mu m, and breaking to obtain large-particle monocrystalline ternary oxide; mixing the small-particle monocrystalline ternary oxide, big-particle monocrystalline ternary oxide and lithium salt in a preset proportion, sintering and cooling to obtain the high-compactness monocrystalline ternary cathode material, wherein the chemical composition of the big-particle monocrystalline ternary oxide is that same as that of the small-particle monocrystalline ternary oxide. The method can be used for improving the discharge voltage, compact density and specific capacity of a ternary cathode material. Compared with a traditional modifying process, the preparation method has the advantages that the flow is simplified, energy is conserved, consumption is reduced, production efficiency is high, lithium loss is small.

The invention discloses a doped high-nickel high-voltage NCM positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: simultaneously doping manganese and cobalt to obtain an NCM precursor; and adding a dopant M into the precursor, and sintering the precursor in a high-pressure oxygen atmosphere to obtain a lithium ion battery positive electrode material. The positive electrode material has very high specific discharge capacity and excellent cycling stability, can meet the high-rate charging and discharging requirement, and can achieve long-life safe cycling under high voltage. The positive electrode material is prepared by combining four-solution parallel-flow co-precipitation witha high-pressure solid-phase synthesis method, and the prepared product has the advantages of high purity, high crystallization quality, high particle density, uniform distribution of particles, excellent electrochemical performance and low manufacturing cost, is an ideal positive electrode material with high energy density, and has a wide application prospect.

The invention discloses a nickel-cobalt lithium aluminate material coated with a sodium-based oxidizing agent and a preparation method thereof. According to the method, the surface of the nickel-cobalt lithium aluminate material is coated with a layer of sodium-based oxidizing agent, the sodium-based oxidizing agent is one or more of sodium peroxide, sodium bismuthate and sodium antimonate and hasstrong oxidability, in the sintering process, the oxidizing agent is partially diffused into crystal nuclei of the material, the oxidation of Ni<2+> is promoted, the lithium-nickel synchysis is reduced, a coating layer with a proper thickness is formed on the surface of the material by other part of the oxidizing agent, the material is prevented from being corroded by electrolyte in the chargingand discharging processes, and the cycling stability of the material is improved.

The invention discloses a preparation method of a positive electrode material of a high-nickel lithium ion battery. The preparation method comprises the following steps of uniformly mixing a certain quantity of oxygenates M2O2 (M is one of Na, K, Cs and Rb) into a mixture of a high-nickel precursor and lithium salt, performing high-temperature sintering, and clearing away salt and alkali which are retained on the surface of the material through distilled water. Compared with the prior art, the preparation method has the advantages that the oxygenates M2O2 absorb carbon dioxide and reduce generation of the lithium salt on the surface of the material; furthermore, oxygen generated by the reaction of the oxygenates and carbon dioxide can be in full contact with raw materials, so that mixing of positive ions of the material is reduced, and the material structure is regular and ordered; finally the material is cleaned through the distilled water; therefore, on one hand, impurities are removed, and on the other hand, the pH value of the material is reduced; the processing performance and the safety of the material are improved.

The invention provides a cerium-zirconium co-doped porous structure positive electrode material and a preparation method thereof. The method comprises the following steps: (1) preparing a ternary solution, a cerium-zirconium blended salt solution, a precipitant solution and a complexing agent solution for later use; (2) preparing a base solution and stirring; (3) injecting the ternary solution, the mixed solution of the cerium salt and the zirconium salt, the precipitant solution and the complexing agent solution into the base solution, carrying out reaction of the stage I and the stage II, and stopping feeding until the reaction reaches the target particle size; (4) centrifugally washing, drying, screening and deironing the reacted slurry to obtain a precursor; and (5) mixing the precursor with a lithium source, and sintering to obtain the positive electrode material. According to the preparation method, the blended cerium-zirconium salt solution is doped into the ternary solution byutilizing liquid-phase doping, so that doped elements are uniformly distributed, and the battery cycle performance of the material is improved by utilizing the synergistic effect of the doped elements; the positive electrode material with a pore structure, high purity and good performance is prepared through process control in different reaction stages.

The invention belongs to the technical field of battery materials and discloses a preparing method for a spherical LiMn1-x-yNixCoyO2 anode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering and whole particle treating. A three-dimensional efficient oblique mixing machine is adopted for raw material mixing, a polyurethane sphere is adopted as a mixed material medium, and lithium carbonate, a nanometer spherical Ni-Co-Mn hydroxide precursor and polyvinyl alcohol are dispersed, mixed uniformly and smashed to form a uniform intermediate mixture. According to the preparing method for the spherical LiMn1-x-yNixCoyO2 anode material, the temperature for primary sintering is low, sintering time is short, the process is simple, the specific capacity is high, and cycling performance is good. The preparing method has the advantages of being small in investment, reliable in technology, low in operation expense and the like, and has good economic benefits and market popularization value.