411 results about "Nickel content" patented technology

The invention provides a ternary precursor and a preparation method thereof, a positive electrode material and a preparation process thereof, and a battery. The ternary precursor comprises an inner core, and a transition layer and a shell which are sequentially coated outside the inner core, the nickel content of the inner core is gt; the nickel content of the transition layer is gt; and the nickel content of the shell. The inner core in the ternary precursor has the highest nickel content, so that the capacity of the positive electrode material prepared from the ternary precursor is ensured; the nickel contents of the inner core, the transition layer and the shell are changed in a gradient manner, so that the thermal stability of the ternary precursor is improved; the shell reduces the interface side reaction between the positive electrode material prepared from the ternary precursor and an electrolyte; the transition layer can be used as a buffer layer between the inner core and the shell, so that the ternary precursor and the structural stability are improved. Therefore, the battery containing the positive electrode material prepared from the ternary precursor has excellent capacity and cycling stability at normal temperature and high temperature.

The invention relates to the technical field of nuclear fusion devices, and discloses a fusion device cooling pipe welding method and welding device.The fusion device cooling pipe welding method comprises the following steps that two cooling pipes to be welded are prepared; an adapter is welded to the welding face of one cooling pipe, and the nickel content of the adapter is higher than that of the cooling pipe; the radial interior of the adapter and the to-be-welded face of the adapter are polished; the two cooling pipes are assembled, so that the welding face of the other cooling pipe is in butt joint with the to-be-welded face of the adapter; and carrying out self-fusion welding on the adapter and the other cooling pipe. According to the welding method for the cooling pipe of the fusion device, the problem that the magnetic conductivity of the cooling pipe exceeds the standard is solved, and meanwhile the welding quality and the welding qualification rate of the cooling pipe are improved.

The invention relates to a method for preparing electrolytic nickel through normal-pressure and high-pressure combined leaching of high-nickel matte, and belongs to the technical field of metal separation and enrichment. The method for preparing the electrolytic nickel through normal-pressure and high-pressure combined leaching of the high-nickel matte mainly comprises the steps of raw material preparation, normal-pressure leaching, solid-liquid separation, high-pressure reaction, metal recovery, impurity removal treatment and filtration and electrodeposition. According to the method for producing the electrolytic nickel through normal-pressure leaching and pressure leaching of the high-nickel matte, the risk that impurities are increased due to the fact that other production auxiliary materials are used is reduced, in the leaching process, steam, compressed air, normal pressure and pressure are optimized and combined innovatively, and leaching of nickel in the high-nickel matte is increased to the maximum extent. Black nickel generated in a production system is used for removing cobalt for the first time, it is guaranteed that the nickel content in the system reaches the standard while impurities are not increased, and meanwhile anode liquor obtained after electrodeposition enters an initial slurrying tank to be recycled.

A short-flow nickel-cobalt-manganese co-extraction process for laterite nickel ore hydro metallurgy falls within the technical field of hydrometallurgy. The process includes the following steps: co-extracting an iron-aluminum removal leaching solution of the laterite nickel ore by using an organic acid extraction system to obtain an enriched nickel-cobalt-manganese solution; extracting impurities from the enriched nickel-cobalt-manganese solution by using a P204 extraction system to obtain a high-purity nickel-cobalt-manganese solution. The co-extraction process of the disclosure simplifies the current hydrometallurgical process flow for extracting nickel-cobalt-manganese from the laterite nickel ore, greatly reduces the acid, alkali, and extractant usage, energy consumption, and water consumption in the extraction process, and reduces the cost of nickel-cobalt-manganese extraction, which is of great significance for the industrial production of ternary nickel-cobalt-manganese raw materials. At the same time, the process of the disclosure can achieve the co-extraction of nickel-cobalt-manganese, with high-purity of nickel-cobalt-manganese and low loss of nickel-cobalt, and the obtained high-purity nickel-cobalt-manganese solution is adjusted according to the proportion of nickel-cobalt-manganese metal in the ternary precursor product, and is finally used for preparing a nickel-cobalt-manganese ternary cathode material.

The invention discloses a process for treating nickel wastewater containing nickel acetate cleaning water and nickel acetate concentrated water, which comprises the following steps: S1, filtering nickel wastewater, S2, carrying out primary concentration treatment, S3, carrying out secondary concentration treatment, S4, treating by a sodium metaaluminate method, S5, carrying out collaborative filtration treatment, and S6, discharging RO (Reverse Osmosis) produced water up to the standard. The method comprises the following steps: primarily enriching nickel ions by adopting primary nickel concentration treatment and secondary nickel concentration treatment, adding a sodium metaaluminate solution into a mixed solution, enabling the pH value of the mixed solution to be 8-12, enabling the nickel ions to react with hydroxyl ions to generate a nickel hydroxide precipitate, adding a sulfuric acid solution to adjust the pH value of the mixed solution back to 6.5-7.5, hydrolyzing sodium metaaluminate to generate an aluminum hydroxide precipitate, and carrying out secondary nickel concentration treatment on the aluminum hydroxide precipitate; aluminum hydroxide adsorbs nickel hydroxide to form a composite precipitate, aluminum ions and nickel ions are subjected to a competitive complexation reaction, and a flocculating agent is added into a mixed solution to form a flocculent precipitate, so that the reaction time is short, the nickel content in the nickel sludge can be greatly increased, the treatment period can be shortened, and the operation cost can be reduced.

According to the present invention, when preparing a hydrogenation catalyst including nickel as an active ingredient, the reduction of nickel can be facilitated by using copper and sulfur as a promoter. In particular, the present invention can provide a catalyst which, while having a high nickel content, includes sulfur oxide and nickel oxide in a particular range, and thus exhibits even higher selective reduction degree for olefins while having high activity of the catalyst.

The disclosure discloses a method for preparing battery-grade nickel-cobalt-manganese sulfate crystals from low nickel matte, which includes the following steps: S1, sequentially performing high-pressure leaching, iron-aluminum removal and nickel-cobalt-manganese precipitation treatment on laterite nickel ore to obtain an underflow containing nickel-cobalt-manganese hydroxide, wherein the pH value of the underflow is 7-8; S2, performing oxygen-pressure leaching on the low nickel matte using sulfuric acid and oxygen to obtain a leached slurry containing residual acid, adding the underflow into the leached slurry to obtain a mixed slurry, and adjusting the pH value of the mixed slurry to be 3-5 using the underflow; and S3, performing filter pressing on the mixed slurry to obtain filtrate and tailings, and performing nickel-cobalt-manganese co-extraction, concentration and crystallization on the filtrate to obtain the nickel-cobalt-manganese sulfate crystals. The method has the advantages of high utilization rate of nickel, cobalt and manganese, few impurities, reduced reagent consumption and technological processes, and high transportation efficiency.

A golf club head has a loft no less than 38°. The golf club head also comprises a material having a material composition that includes an Iron content that by weight is highest of all constituents. The material composition also has a Chromium content no less than 10.5% by weight and a Nickel content no greater than 0.5% by weight.

The invention relates to an alloy for manufacturing a tool for manufacturing an aeronautical component made of a composite material, the alloy comprising, by weight: 32.6% < = nickel < = 38.0%; 0.80% < = cobalt < = 4.20%, where cobalt > =-1.00 * nickel% + 36.80%, where nickel% represents the nickel content in the alloy by weight percent, and cobalt < =-1.63 * nickel% + 62.72%, where nickel% represents the nickel content in the alloy by weight percent; 1.0% < = titanium < = 2.0%; 0.0010% < = rare earth element < = 0.0500%; 0.10% < = silicon < = 0.35%; 0.15% < = manganese < = 0.60%; 0.005% < = carbon < = 0.04%; and the balance of iron and impurities produced by the production process.

A coated cathode material for lithium-ion batteries is disclosed. Methods and systems are further provided for applying a coating to an active cathode material for use in a lithium-ion battery. In one example, the coated cathode material may include a high-nickel content active cathode material, such as lithium nickel manganese cobalt oxide or lithium nickel aluminum cobalt oxide, coated with a coating including one or more high energy density active materials, such as lithium vanadium fluorophosphate and / or a lithium iron manganese phosphate compound. In some examples, the high-nickel content active cathode material may include greater than or equal to 60% nickel content.

The invention discloses a clean production process for cyclic utilization of nickel-containing waste, which comprises the following steps: placing nitrogen trifluoride electrolysis nickel-containing waste residue in an electrothermal furnace, sublimating or decomposing ammonium bifluoride in the nickel-containing waste residue, condensing, liquefying and crystallizing through a condensing system to re-synthesize ammonium bifluoride for sale or reuse; the main components of the material a heated and volatilized by the electrothermal furnace are nickel fluoride, ferric fluoride and copper fluoride; adding the material a into an alkaline material solution for conversion leaching to obtain nickel hydroxide, ferric hydroxide and copper hydroxide, and converting a sodium hydroxide or potassium hydroxide solution into a sodium fluoride or potassium fluoride solution; adding an acid-carrying anolyte of a nickel electrolysis system into the obtained nickel hydroxide, ferric hydroxide and copper hydroxide slag, dissolving nickel hydroxide, ferric hydroxide and copper hydroxide into an electrolyte by using acid in the anolyte, removing metal impurities, and filtering to obtain a pure nickel electrolysis pre-solution; and electrolytic nickel with the nickel content larger than 99.96% of Ni is produced through insoluble anode electrolysis.

The application discloses a method for improving the quality of high-nickel steel and belongs to the technical field of high-nickel steel continuous casting. The method comprises the following steps: continuously casting high-nickel steel liquid with a nickel content of not less than 3.5% in a continuous casting machine; controlling the temperature of a slab entering and leaving a two-cooling zone of the continuous casting machine and the opening shrinkage value of a casting roller of the two-cooling zone during the continuous casting process, so that the slab is pressed down and high-quality high-nickel steel is obtained; wherein the temperature of the slab entering and leaving the two-cooling zone of the continuous casting machine is 1100-1150 DEG C and 800-900 DEG C respectively, and the opening shrinkage value of the casting roller of the two-cooling zone of the continuous casting machine is 1.6-4.5 mm. The method provided by the application realizes solute element redistribution, slows down the defects of element central segregation, and thus improves the quality of high-nickel steel.

A brake disc for a disc brake may have a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The disc is provided with a base layer constituted by steel having a nickel content of at most 15% which covers at least one of the two braking surfaces of the braking band.

To provide a method for producing welded steel blank (1).SOLUTION: This method comprises butting and joining sheets (2) using a filler wire (20) so as to produce a welded joint (22) having an aluminum content AlWJ included between 0.1 wt.% and 1.2 wt.%, each being provided with a steel base material (3) having a precoating (5) on each of two main surfaces (4) and each sheet (2) being provided with a removal zone (18) from which the precoating (5) is removed by a removal rate at a welded edge on each main surface (4). The composition of the wire (20) and the ratio of the added wire (20) are set such that the welded joint (22) has (a) a hardening coefficient FTWJ and (b) AlWJ has a nickel content NiWJ≤14-3.4xAlWJ and a chrome content CrWJ≤5-2xAlWJ which are aluminum contents of the welded joint (22).SELECTED DRAWING: Figure 4

The invention relates to the technical field of cross arm processing, and discloses a precision forging process of a high-strength truck cross arm, which comprises the following steps: 42CrMo4 alloy steel is selected, and chemical components of the 42CrMo4 alloy steel are adjusted, the vanadium content is 0.1-0.2%, the titanium content is 0.02-0.05%, and the nickel content is 2-3%; the adjusted alloy steel blank is heated to the temperature ranging from 1150 DEG C to 1250 DEG C; performing multi-stage forging, including pre-forging, multi-directional forging and precision forging; carrying out cold forging and controlled cooling treatment on the forged cross arm; and the forged cross arm is subjected to quenching and multiple times of tempering heat treatment. According to the precise forging process and the multi-stage heat treatment, the mechanical performance of the truck cross arm is remarkably enhanced, the tensile strength and toughness are improved and the internal stress is reduced by precisely controlling the heating and cooling rates, and the method effectively prolongs the service life of a product and improves the reliability in heavy-load and high-fatigue environments.

A positive electrode active material of a rechargeable lithium battery may include a core particle including a lithium nickel-manganese-aluminium-based composite oxide, and a coating layer disposed on a surface of the core particle and including aluminium, wherein a nickel content of the core particle is about 60 mol% to about 80 mol% and an aluminium content of the core particle is about 1 mol% to about 3 mol% based on about 100 mol% of a total metal excluding lithium, and an aluminium content of the coating layer is about 0.1 mol% to about 2 mol% based on about 100 mol% of the total metal excluding lithium.

The invention provides an anti-wear and anti-friction gradient nanostructure Ni coating which comprises a coating a with the grain size of 430-530 nm, an amorphous belt layer a, a coating b with the grain size of 100-140 nm, an amorphous belt layer b and a coating c with the grain size of 27-33 nm which are sequentially arranged on a metal base material from inside to outside. The thickness ratio of the plating layer a to the plating layer b to the plating layer c to the amorphous ribbon layer a to the amorphous ribbon layer b is (10-10.5) [mu] m to (8.5-9) [mu] m to (1.45-1.65) [mu] m to (30-40) nm to (3-5) nm; the content of nickel in the plating layer a, the plating layer b, the plating layer c, the amorphous ribbon layer a and the amorphous ribbon layer b is not less than 99.9 at%. Meanwhile, the invention further discloses a preparation method of the anti-wear and anti-friction gradient nanostructure Ni coating. The plating layer is the gradient nanometer Ni plating layer with the grain size in the gradient change trend from inside to outside, the amorphous zone layer exists between the plating layers with different grain sizes, the hardness value of the gradient nanometer metal Ni plating layer is higher, the friction coefficient and the wear rate are lower, and the gradient nanometer metal Ni plating layer has excellent wear resistance and friction reduction performance.

The invention relates to steel for liquefied natural gas and a manufacturing method thereof, the steel comprises the following components in percentage by weight: 0.03-0.10% of C, 0.10-0.30% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.006% of P, 5.0-6.5% of Ni, 0.10-0.30% of Mo, 0.1-1.0% of Cr and the balance of Fe and other inevitable impurities, and the components also need to simultaneously meet the following conditions: more than or equal to 10.5% of 4C + 2Ni + Mn-5Mo-0.5 Cr; and not less than 2.0% of 5C + 1.1 Mn + 1.8 Cr + 3.5 Mo. Under the condition of low nickel content, the steel plate has high deformation allowance in a low-temperature environment of-196 DEG C, so that the steel plate has high service safety; the yield strength of the steel plate is larger than or equal to 585 MPa, the tensile strength is 680-820 MPa, the ductility is larger than or equal to 18%, the impact energy at the temperature of-196 DEG C is larger than or equal to 150 J. The performance of the steel plate is similar to that of traditional 9Ni steel, but the cost is lower, and the steel plate can be used for manufacturing land storage tanks and containers of liquefied natural gas (LNG) and LNG transport ships.

The invention provides a composite steel core ferronickel welding rod and a preparation method thereof, and particularly relates to the technical field of welding materials. The composite steel core ferronickel welding rod comprises a welding core, a steel belt and a coating, the welding core is wrapped with the steel belt, the steel belt is wrapped with the coating, and the coating comprises, by weight, 32-40 parts of marble, 18-23 parts of fluorite, 10-15 parts of barium carbonate, 5-10 parts of iron powder, 4-7 parts of graphite, 3-10 parts of nickel powder, 1-3 parts of manganese metal, 3-5 parts of atomized ferrosilicon, 2-4 parts of feldspar, 0.5-1 part of sodium carbonate, 0.3-0.5 part of CMC and 0.3-0.8 part of microcrystalline cellulose. The welding core comprises the following components in percentage by mass: more than or equal to 99 wt% of nickel and the balance of inevitable impurities. The welding rod is free of the problems of redness, heating, coating cracking and falling during welding, high-efficiency welding with ultra-large current can be achieved, and waste is reduced.

The invention relates to the field of electroplating, and provides a technological preparation method for alkaline electroplating of zinc and nickel, which comprises the following steps: S1, pretreating a workpiece; s2, preparing a tank solution; s3, preparing a first reagent, a second reagent and a third reagent; s4, extracting a proper amount of bath solution, analyzing the content of zinc in the extraction bath solution by using a first reagent, analyzing the content of sodium hydroxide in the extraction bath solution by using a second reagent, and analyzing the content of nickel in the extraction bath solution by using a third reagent; s5, judging whether the contents of zinc, sodium hydroxide and nickel in the bath solution are within a specified process range or not according to electroplating process requirements, and if not, returning to the step S2; s6, the workpiece is put into a plating tank, tank liquid is added, electroplating parameters are controlled, and electroplating is completed; the content of substances in the bath solution can be detected, and the preparation stability of the bath solution is improved.

The present invention relates to a method for preparing a low-stress, high-toughness, thin-gauge wear-resistant steel. The method produces a low-stress, high-toughness, thin-gauge wear-resistant steel plate by combining specific component design with offline heat treatment. The specific component design is to use laterite nickel ore instead of nickel alloy to produce high-toughness wear-resistant steel, and the nickel content is controlled to be 0.50-2.00wt.%; the hot-rolled steel plate is coiled and flattened and then subjected to offline heat treatment, and the offline heat treatment adopts roller-type restrained quenching and low-temperature tempering through hot air flue gas circulation heating. The method simplifies the production process, reduces the production cost, and improves the strength, toughness and formability of the wear-resistant steel; produces a low-stress, high-toughness, thin-gauge wear-resistant steel, the steel plate hardness is 360-500HB, the tensile strength is 1100-1650MPa, the elongation is 11%-15%, the steel plate residual stress is below 100MPa, and the impact toughness at -60℃ can reach 50J / cm 2 above.

The invention provides a preparation method of a cobalt-based alloy casting, which comprises the following steps: S1, raw material preparation: selecting the following raw materials in percentage by mass: 50-65% of cobalt, 20-30% of chromium, 5-15% of tungsten, 3-8% of nickel, 0.2-0.8% of carbon and the balance of inevitable impurities, pretreating the raw materials to remove impurities such as surface oil stains and oxides; s2, smelting: adding the pretreated raw materials into a vacuum induction smelting furnace; according to the preparation method of the cobalt-based alloy casting, the raw material ratio and pretreatment are accurately controlled, smelting is conducted under the vacuum condition, and electromagnetic stirring is combined, so that the uniformity of alloy components is effectively guaranteed, and the stability of the performance of the casting is improved; the reasonable casting process comprises proper casting temperature, casting mold preheating and a bottom pouring type casting mode, so that the defects of air holes, shrinkage porosity and the like are reduced, and the casting quality is improved.

The invention discloses a method for low-temperature synthesis of an ultra-high nickel single crystal positive electrode material based on a molten salt fluxing agent method, which comprises the following steps: mixing an ultra-high nickel precursor with the nickel content of more than or equal to 90% with a lithium source according to a stoichiometric ratio, then adding a certain mass of sodium chloride (NaCl) as a fluxing agent medium, and fully grinding; the mixed material is subjected to temperature programming sintering in an oxygen-containing atmosphere, and the highest sintering temperature is controlled between 700 DEG C and 850 DEG C; and cooling, washing, drying and sieving the sintered product to finally obtain the small-size ultrahigh-nickel single-crystal positive electrode material with good dispersity. By introducing the low-melting-point molten salt fluxing agent, the growth temperature of the single crystal is remarkably reduced, lithium volatilization and abnormal growth and agglomeration of crystal grains are effectively inhibited, and the obtained single crystal particles are uniform in size (2 microns) and have a good layered structure and electrochemical performance. The method is simple in process, low in cost and suitable for large-scale production of the ultrahigh-nickel single-crystal positive electrode material for the high-performance lithium ion battery.

Provided are processes for extracting nickel and lithium from a Ni2+ / Li+ solution. The process for extracting nickel and lithium includes providing a Ni2+ / Li+ solution comprising an amount of lithium and an amount of nickel, treating the Ni2+ / Li+ solution with an alkaline agent to adjust the pH of the Ni2+ / Li+ solution to between about 1.0 to about 10.0, and treating the Ni2+ / Li+ solution with a nickel selective extractant, the nickel selective extractant suitable to extract nickel from the Ni2+ / Li+ solution at said pH to thereby produce a Li+ solution with less than 1000 parts per million Ni2+. Once complete, the process provides for recoverable nickel and / or lithium that may be recycled into batteries or sold for other uses.

The invention discloses a method for determining the contents of iron and nickel of matrix elements of an iron-nickel alloy by an ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer) method. The method is specifically implemented according to the following steps: step 1, carrying out three methods of sample pretreatment; 2, determining an analysis spectral line of iron and nickel; 3, internal standard elements and the adding amount of the internal standard elements are determined; and 4, calculating the content of iron and nickel through the relative strength. The method provided by the invention solves the problem of inaccurate measurement result in the existing method for measuring the contents of the matrix elements iron and nickel in the iron-nickel alloy, and has good accuracy and precision.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and system for removing heavy metals in wastewater, and the system comprises a collecting tank, a regulating tank, a Fenton-ultrasonic synergistic reaction tank, an addition and reduction sedimentation tank, a flocculation tank, a first sedimentation tank, a three-cavity nickel removal tank, a second sedimentation tank, a multi-parameter monitoring tank, an A / O tank, a third sedimentation tank and a clean water tank which are communicated in sequence. Discharging the adjusted wastewater containing the heavy metals into a Fenton-ultrasonic synergistic reaction tank to realize complex breaking of the complex-state heavy metals; adjusting the wastewater subjected to complex breaking treatment to be neutral, so that heavy metals are converted into hydroxide precipitates, and most of the heavy metals are removed at the stage; discharging the treated water into a flocculation tank, standing and precipitating, and enabling supernate to enter a nickel removal tank; and an organic sulfur catching agent is added into the nickel removal tank to strengthen chelation reaction, so that the nickel content is less than 0.1 ppm. According to the system, through four-stage cooperation of oxidation, precipitation, dynamic capture and intelligent feedback, the complex nickel removal problem is solved, and the comprehensive heavy metal removal rate is larger than or equal to 99.5%.

The invention belongs to the technical field of scrap copper refining and impurity removal, and particularly discloses a method for deeply removing nickel from scrap copper. The method comprises the following steps: melting scrap copper, firstly adding an impurity removal agent A to carry out primary impurity removal and slagging-off, and then adding dihydric phosphate to carry out deep impurity removal, so as to obtain a copper liquid with the nickel content of less than 30 ppm; the impurity removal agent A comprises an iron-containing component and a non-iron component, the valence state of an iron element in the iron-containing component is greater than or equal to 2, and the non-iron component comprises SiO2 and Al2O3. According to the method, firstly, the iron-containing minerals are used as an impurity removal agent A to rapidly remove impurities from the scrap copper, then dihydric phosphate is used as a deep impurity removal agent to deeply remove nickel, meanwhile, iron introduced during preliminary impurity removal is removed, and almost no new impurities are introduced. The method is simple in process, high in controllability, excellent in implementation effect and convenient for industrial application.

The present application relates to the technical field of nuclear fusion device, disclose a kind of welding method of fusion device cooling pipe, wherein, the welding method of fusion device cooling pipe includes the following steps: preparation two cooling pipes to be welded;Welding adapter on the welding surface of one of the cooling pipes, the nickel content of the adapter is higher than the nickel content of the cooling pipe;The radial interior of adapter and the welding surface to be welded of adapter are polished;Two cooling pipes are matched, so that the welding surface of another cooling pipe is connected with the welding surface to be welded of adapter;Self-fusion welding is carried out on the adapter and another cooling pipe.The welding method of fusion device cooling pipe of the embodiment of the present application not only solves the problem of excessive magnetic permeability of the cooling pipe, but also improves the welding quality and welding qualification rate of the cooling pipe.

The invention discloses a method for preparing a copper-nickel alloy for a solid-state battery through an alkaline system, and belongs to the technical field of solid-state batteries. A pyrophosphate aqueous solution system is used as an electrolyte, and the copper-nickel alloy is prepared through an electro-deposition method; the pyrophosphate aqueous solution system comprises the following components: raw materials of copper pyrophosphate and nickel chloride, a main complexing agent of potassium pyrophosphate, an auxiliary complexing agent of ethylenediaminetetraacetic acid or potassium sodium tartrate, a brightener and an additive. The components and thickness of the alloy are adjusted by changing the metal ion concentration, the input amount of the complexing agent and the like and changing the technological parameters (pH, current density, electrodeposition time and the like), the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content being 8.93% can be prepared, the corrosion resistance is excellent, the coating thickness is uniform, electrodeposition can be conducted at the normal temperature, and the copper-nickel alloy can be used for preparing the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content reaching 8.93%. Therefore, the method is suitable for large-scale industrial production.

Disclosed herein are a nickel-based lithium metal composite oxide, a method of preparing the same, and a lithium secondary battery including a positive electrode including the same. The nickel-based lithium metal composite oxide includes: secondary particles including an aggregate of primary particles, in which a nickel content in the nickel-based lithium metal composite oxide is 50 mol% or more, the secondary particles including large secondary particles having a particle size of 10 m or more and small secondary particles having a particle size of 5 m or less, the nickel content in the large secondary particles is greater than the nickel content in the small secondary particles, the nickel content in the large secondary particles is 85 mol% to 99 mol% based on the total content of the transition metal in the nickel-based lithium metal composite oxide, and the nickel content in the small secondary particles is 75 mol% to 89 mol% based on the total content of the transition metal in the nickel-based lithium metal composite oxide.