23 results about "Cathode material" patented technology

The invention relates to a surface coating modified lithium ion battery cathode material and a preparation method thereof. The surface coating modified lithium ion battery cathode material has a general chemical formula of LiNi<1-a-b>CoaAlbO2/M, wherein a is more than 0.1 and less than 0.3, b is more than 0.01 and less than 0.2, and M refers to a coating layer. The material is coated by adopting a dry method; the coating layer refers to one or a mixture of two of lithium iron phosphate and lithium ferric manganese phosphate; and the mass ratio of the coating layer to LiNi<1-a-b>CoaAlbO2 is (0.01-0.2):1. The surface coating modified lithium ion battery cathode material and the preparation method thereof disclosed by the invention have the advantages that the stability of the cathode material is improved, and the safety performance of the material is improved; and moreover, in the dry-method coating process, waste liquor is not produced, high-temperature sintering is not needed, and the energy consumption and cost can be reduced.

The invention relates to an electrolyte for a ternary cathode material lithium ion battery. The electrolyte comprises a lithium salt, organic solvent and an additive, wherein the lithium salt is an imidodisulfuryl fluoride lithium salt of which the concentration is greater than 1 mol/L; the organic solvent comprises cyanogen carboxylate and other non-water organic solvent; the addition mass of the cyanogen carboxylate is 5-35% of the total mass of the organic solvent; the cyanogen carboxylate is a combination of one or more selected from the following structural formulae in the specification; and at least one of R1 and R2 is a cyanogen radical or a cyanogen radical containing group. By using the electrolyte provided by the invention, the cycle performance of the ternary cathode material lithium ion battery at normal temperature can be stabilized, the aging and swelling phenomena of the ternary cathode material lithium ion battery under high-temperature conditions can be inhibited, and the internal resistance of the ternary cathode material lithium ion battery is reduced.

An electrode comprises a conductor and an electrode coating, said electrode coating comprising as electronically active material a transition metal (T) oxidenitride of formula Li_xT^I_mT^II_nN_yO_z form of nanoparticles, wherein x=0-3, y+z=2-4, y>0, z>=0.25, m+n=1, m=0-1, n=0-1, T^I and T^II both being transition metals of the groups IVB, VB, VIB and VIIB, and periods 3d, 4d and 5d, in particular transition metals selected from Zr, Nb, Mo, Ti, V, Cr, W, Mn, Ni, Co, Fe and Cu. Dependent on the kind of transition metal, its oxidation state and the Li content, such materials may be used as anode materials or as cathode materials, respectively.

Provided is an auto-thermal evaporative liquid-phase synthesis method for cathode material for battery, comprising the following steps: (1) Adding a synthetic raw material of cathode material into a solvent to obtain a mixture A, the synthetic raw material of the cathode material containing lithium source, adding an accelerant into the mixture A, which makes the mixture A achieve a strong auto-thermal reaction to release heat to evaporate the solvent, and obtaining a solid precursor of the cathode material; (2) Drying the precursor, sintering in an atmosphere furnace and obtaining the cathode material. The method is simple in process, low in energy consumption, requirements for equipment and cost, and is applicable to industrial mass production and application. The cathode material obtained through the method is stability in batch, easy to process, low in internal resistance and high in capacity and has an excellent charging and discharging performance.

The invention discloses a modified lithium-rich manganese-based cathode material for a lithium ion battery. The structural general formula of the material is (La<1-x>Sr<x>)MnO<3-delta>, wherein x is equal to or greater than 0 and less than or equal to 0.3, a is equal to or greater than 0.8 and less than or equal to 1, and delta is equal to or greater than 0 and less than or equal to 0.75; the modified lithium-rich manganese-based cathode material is prepared through the method 1 or method 2 as follows: method 1: lanthanum salt, strontium salt and manganese salt are mixed according to the stoichiometric proportion to prepare a (La<1-x>Sr<x>)MnO<3-delta> precursor solution, then a complexing agent is added into the solution and stirred uniformly, the lithium-rich manganese-based cathode material is added into the solution, heating is performed to evaporate the solution to form gel, and finally the dried gel is calcined, so that the modified cathode material is obtained; method 2: a precursor solution is prepared according to the method 1, a complexing agent is added into the solution and stirred uniformly, then the mixed solution is heated until the solution is burnt into powder, the powder is pre-burnt and is mechanically mixed with the lithium-rich manganese-based cathode material, and the mixture is calcined, so that the modified cathode material is obtained.

The invention relates to a method for preparing the cathode material used in a ferrous phosphate lithium battery by adopting low-valent oxyacid of phosphorus; the technical proposal is as follows: lithium salt, ferrous salt, phosphate, and hypophosphorous acid or hypophosphite are blended according to the mol ratio that Li: Fe: PO4<3->: H3PO2 or AH2PO2 or E(H2PO2)2 is equal to x: y (1-z): k. Carbon-containing compound or carbon powder and wet milling liquid are added, ball milling is carried out for 3-12 hours, and the mixture is dried in atmospheric pressure or vacuum at 48-100 DEG C. The dried powder is prepared into the lithium iron phosphate containing controllable Fe2P by two-stage sintering process or temperature programmed two-stage sintering process. When the molecular formula of hypophosphite, one ingredient of the reaction composite, is AH2PO2 or E(H2PO2)2, A is Li<+>, Na <+>, K<+>, Ag<+> or NH<+>, E is Ca<2+>, Sr<2+>, Ba <2+>, Ga <2+>, Ge<2+>, Sn<2+>, Sc<2+>, Mn<2+>, Fe<2+>, Co<2+>, Ni<2+>, Cu<2+>, Zn<2+> or Mo<2+>. The method of the invention has low cost of raw materials, broad source of raw materials, simple preparation and short time consumed; the prepared materials have even composition, excellent discharge performance and good discharge cycling performance in heavy current.

The invention provides a lithium ion battery cathode, the cathode comprises a current collector and a cathode material layer positioned on the surface of the current collector, wherein the cathode material layer is a copper stibium alloy electroplated layer, the thickness of the copper stibium alloy electroplated layer is 5-40 mum, the weight content of copper in the copper stibium alloy is 35%-65%. The invention also provides a method for preparing the lithium ion battery cathode by depositing the copper stibium alloy on the current collector through an electroplating method. The invention also provides a battery which takes the cathode as the lithium ion battery cathode. The lithium ion battery cathode of the invention has the advantages of excellent conductive performance, cycle performance and heavy current charge and discharge performance, the plated layer and the current collector base material enable strong bonding force, the cathode material on the surface of the current collector possesses a stable structure. The electroplating method used by the invention is capable of accurately regulating and controlling the thickness and component of the copper stibium alloy electroplated layer on the current collector in certain extent, all the steps are carried out under normal temperature, the reaction time is short and the energy consumption is low.

A surface modify ternary cathode material is prepared by coat a surface modified layer on that core of the ternary cathode material; The ternary cathode material core is Li1+kNixCoyMzO2, wherein M isone of Al, Mn, Ti and Mg, and the ternary cathode material core is Li1+kNixCoyMzO2, wherein M is one of Al, Mn, Ti and Mg. 0.1 <= k <= 0. 1, 0 < x < 1, 0 < y < 1, 0 < z < 1; The surface modification layer is formed of two surface modification substances, one is yttria stabilized zirconia, the other is oxide, selected from Al2O3, SiO2, MgO and ZrO2. The invention also provides a preparation methodof the surface-modified ternary cathode material and a battery made of the surface-modified ternary cathode material. The YSZ provided by the invention is an oxide containing oxygen vacancies, which is favorable for lithium ion migration. The surface of the high nickel ternary cathode material modified by the YSZ has a faster lithium ion migration rate, and the lithium ion diffusion problem can bewell improved by covering the surface of the high nickel ternary cathode material, and the magnification performance of the material can be improved.

The invention discloses a preparation method of a silicon-coated modified ternary cathode material, which comprises the following steps of: a, preparing silicon coating liquid, i.e., adding a liquid silicon source into absolute ethyl alcohol, adding a certain amount of dispersing agent and continuously stirring to obtain the silicon coating liquid; b, performing a coating reaction, i.e., adding ternary composite oxide LiNixCoyMn1-x-yO2 into the silicon coating liquid, continuously stirring and performing the coating reaction; and c, carrying out secondary processing, i.e., after the reaction,carrying out solid-liquid separation, and after extraction filtration, washing, drying, calcining and natural cooling, obtaining the silicon-coated modified ternary cathode material. The preparation method is simple to operate, a sintering process has no special requirements, and the synthesized material is stable in structure, high in cycling and high-temperature performance and environmental-friendly.

The invention relates to a method for preparing a metatitanic acid doped polyaniline combined electrode nanomaterial for a super capacitor and electrochemical performance analysis for the nanomaterial, belonging to the field of preparation of electrode materials of the super capacitor. In the invention, an in-situ chemical polymerization method is used for preparing the metatitanic acid doped polyaniline combined electrode nanomaterial with a coralliform shape and a uniform dimension to serve as an anode material, activated carbon serves as a cathode material, the anode material and the cathode material are assembled into an asymmetrical super capacitor, and a comprehensive performance analysis test is performed. Results from the embodiment of the invention show that the metatitanic acid doped polyaniline combined electrode nanomaterial has the discharge specific capacitance reaching over 90F/g and the cycle life reaching over 2000 times, the specific capacitance value of the metatitanic acid doped polyaniline combined electrode nanomaterial is always stabilized to be over 90% of an initial value in a cyclic process, and the metatitanic acid doped polyaniline combined electrode nanomaterial has a practical application value.

The invention relates to a method of recycling an electrode metal material from a waste lithium titanate battery. The method comprises the following steps: step (1) roasting; step (2) acid leaching; step (3) removing Al3<+>; step (4) recovering Li<+>; step (5) recovering and preparing a cathode material; step (6) recovering and preparing an anode material; and step (7) preparing the lithium titanate battery. By taking the waste lithium titanate battery as a raw material to be recycled, environmental pollution is avoided, and meanwhile, the economical benefit is high. The method employing conventional equipment is simple in process flow, easy to control, simple and feasible and green and environmental-friendly, has economical benefits and value, can remove part of impurity elements, and recycles part of metals of a lithium battery.

The invention discloses a novel aqueous magnesium metal secondary battery and a preparation method thereof. The preparation method comprises the following steps of: selecting a safe and nontoxic magnesium alloy as an anode; selecting a common cathode material with a large-size ion diffusion channel, conductive carbon black and a binder for size mixing to prepare a cathode for the aqueous magnesium metal battery; and dissolving magnesium salt and an additive in an aqueous/organic mixed electrolyte with a certain volume ratio through ultrasonic assistance, and using the electrolyte to assemble the aqueous magnesium metal secondary battery. The assembled aqueous magnesium metal secondary battery can stably circulate for more than 60 times under large current, so that the cycle life of the battery is greatly prolonged, the output voltage is high, the specific capacity is large, and the battery has high output voltage of 1.6 V or above and high reversible specific capacity of 197 mA h g <-1 >. The battery has important potential application value, is low in dependence on use scenes and wide in application range, and has wide application prospects in the fields of power grid energy storage, low-speed electric vehicles, flexible wearable power supply and the like.

The invention discloses a preparation method of a special-morphology micro nano structural lithium-rich manganese-based cathode material, and belongs to the technical field of novel energy material energy storage material preparation processes. The method comprises the following steps: dissolving a manganese salt and a nickel salt into distilled water according to a ratio to obtain an A liquid; dissolving a homogeneous precipitant weighed according to a ratio into distilled water to obtain a B liquid, introducing a certain ratio of an ionic liquid into the B liquid, performing full stirring, and performing uniform mixing; mixing the A liquid and the mixed B liquid, and performing full stirring; transferring the mixed liquid to a hydrothermal reaction kettle, performing a hydrothermal reaction, performing cooling to room temperature, performing centrifugal separation, performing washing, and performing drying to obtain a manganese-based precursor material; and finally grinding the precursor and a certain ratio of lithium carbonate, performing uniform mixing, performing pre-sintering, and performing calcination to obtain the lithium-rich manganese-based cathode material. The method provided by the invention solves the problems of high energy consumption, long consumed time and difficulty in control of product topography characteristics in the preparation process in the prior art.

The invention discloses a method for preparing a vacancy vanadium-based MAX and its application. The vanadium-based MAX (V ₂ AlC or V ₄ AlC ₃ ) as raw material, prepared by hydrothermal treatment in hydrochloric acid solution or sulfuric acid solution; the lattice structure of the vacant vanadium-based MAX has vanadium vacancies, and the number of vanadium vacancies can be controlled by adjusting the temperature and time of hydrothermal treatment of hydrochloric acid or sulfuric acid solution Adjustment; at the same time, aluminum has the function of supporting the entire vacant vanadium-based MAX lattice framework, that is, during the hydrothermal treatment of hydrochloric acid or sulfuric acid solution, the aluminum in the vanadium-based MAX lattice structure does not change, but the vanadium will dissolve to generate vanadium vacancies. The vanadium vacancy content in vacancy vanadium-based MAX is 50~90%. The vacancy vanadium-based MAX has a specific capacity higher than 300mAh/g when used as a cathode material for zinc-ion batteries. It has a vanadium vacancy structure capable of storing zinc ions, excellent rate performance and good cycle stability, and is an ideal cathode material for zinc-ion batteries.