CN108118149B - A method of power battery anode material presoma is prepared with nickel sulfide concentrate - Google Patents
A method of power battery anode material presoma is prepared with nickel sulfide concentrate Download PDFInfo
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- CN108118149B CN108118149B CN201711338802.3A CN201711338802A CN108118149B CN 108118149 B CN108118149 B CN 108118149B CN 201711338802 A CN201711338802 A CN 201711338802A CN 108118149 B CN108118149 B CN 108118149B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
- C22B3/38—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
- C22B3/384—Pentavalent phosphorus oxyacids, esters thereof
- C22B3/3846—Phosphoric acid, e.g. (O)P(OH)3
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B47/00—Obtaining manganese
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The present invention proposes a kind of method for preparing power battery anode material presoma with nickel sulfide concentrate, comprising steps of 1) normal pressure acid decomposes: by nickel sulfide concentrate and sulfuric acid reaction, obtained filter residue is vulcanization copper ashes；2) gained filtrate is reacted with oxidizing gas, it is separated by solid-liquid separation after reaction, filter residue is to prepare LiFePO4 presoma, 3) oxidant extraction and separation: is added into filtrate obtained by step 2), extracted after reaction, 4) preparation of nickel-cobalt-manganese ternary battery material presoma.Method proposed by the present invention, for the distinctive association feature of nickel sulfide ore, realizes the depth integration of nonferrous smelting and material preparation, produce the presoma of lithium-ion-power cell, the iron oxide presoma and nickel cobalt manganese hydroxide for directly obtaining even particle size distribution, shorten reaction route；Meanwhile the rate of recovery of association cobalt in nickel sulfide concentrate is greatly improved, reduce the discharge of melting waste slag, realizes the resource utilization of iron in nickel sulfide concentrate.
Description
Technical field
Field of energy source materials of the present invention, and in particular to a method of comprehensive utilization nickel minerals obtains electrode material presoma.
Background technique
Traditional nickel sulfide mineral, which is smelted, usually all to be needed by " flash smelting prepares low nickel matte → bessemerize preparation Gao Bing
The processing of nickel ".In flash smelting and during bessemerize, nickel, copper, the loss amount of cobalt are larger, especially in blowing, by
Higher in oxygen gesture, nickel, cobalt are more easier to enter the loss for leading to metal in slag in the form of the oxide；Meanwhile it is molten in flash
A large amount of sulfur dioxide flue gas can be generated during refining and bessemerizing, although solving pollution atmosphere after sulfur dioxide relieving haperacidity
The problem of, but caused by a common problem be exactly sulfuric acid " swell-belly ", that is, caused by sulfuric acid be difficult to consume, storage is got over
Product is more, economically not cost-effective, while there is also such as reveal biggish security risk.Flash smelting and the mistake bessemerized
There is also the discharges that another biggish environmental issue is exactly metallurgical slag for journey.Nickel sulfide concentrate be actually based on iron content,
Its content is much higher than the content of nickel, copper, cobalt etc., and in flash smelting and during bessemerize, iron is finally in the form of the oxide
The slag formers such as supplying silica are also needed into slag, and when slag making, at present the waste sludge discharge equivalent of nickel sulfide concentrate smeltery
Substantially in 10 tons of slags/ton nickel level, quantity of slag discharge is big.
On the other hand, New Energy Industry is greatly developed so that the market demand of power lithium battery sharply increases, now big
Most battery enterprises selects the nickel cobalt manganese anode material of ternary, so that cobalt is also at a kind of serious situation that supply falls short of demand.And
The country of the originally one poor cobalt in China needs a large amount of cobalt of import, and the main association of self-produced cobalt is in nickel sulfide ore.And work as
Preceding nickel sulfide concentrate rate of recovery of cobalt in smelting process is very low, still less than 50%.Smelting in conjunction with current nickel sulfide ore is existing
How shape improves the rate of recovery of resource, solves the problems, such as that pollution problem existing for smelting process becomes urgent need to resolve.
In view of the above-mentioned problems, the present invention proposes a kind of new thinking, it is process object with nickel sulfide concentrate, directly carries out normal
Acidleach is pressed, gained leached mud can be used for the smelting of copper and noble metal, and the iron in leachate is after processing with ferric lithium phosphate precursor
Form output；Solution after separation iron is extracted and back extraction obtains nickel, cobalt mixed solution and nickel sulfate solution, nickel, cobalt mixing
Solution is used to prepare nickel-cobalt-manganese ternary battery material, and nickel sulfate solution can be used for the production of nickel sulfate hexahydrate crystal or electric nickel.New approaches
The advantages of be to be greatly improved the rate of recovery of association cobalt in nickel sulfide concentrate, improved from the original rate of recovery less than 50%
To 95% or more the rate of recovery, the rate of recovery of noble metal can also improve 5-10%；Meanwhile by traditional pyrometallurgical smelting process into
Enter the iron of the clinker output in the form of ferric lithium phosphate precursor iron oxide red, drastically reduce the discharge of melting waste slag, realizes
The resource utilization of iron.
Summary of the invention
Place in view of the shortcomings of the prior art, prepares power with nickel sulfide concentrate the object of the present invention is to provide a kind of
The method of cell positive material presoma.
Second object of the present invention is to propose product made from the method.
The technical solution of above-mentioned purpose to realize the present invention are as follows:
A method of power battery anode material presoma being prepared with nickel sulfide concentrate, comprising steps of
1) normal pressure acid decomposes: nickel sulfide concentrate being reacted under normal pressure with sulfuric acid, is separated by solid-liquid separation, obtains after the reaction was completed
Filter residue is vulcanization copper ashes, and filtrate is used for next step；
2) preparation of LiFePO4 presoma: the resulting filtrate of step 1) is added in autoclave and oxidisability
Gas is reacted, and is separated by solid-liquid separation after the reaction was completed, will be to prepare LiFePO4 presoma after residue washing drying,
Gained filtrate prepares nickel-cobalt-manganese ternary presoma for next step；
3) oxidation and extraction and separation: being added oxidant into filtrate obtained by step 2), maintain the pH value of solution 3-5 it
Between, it is separated by solid-liquid separation after reacting 1-5h；Extractant is added in filtrate and is extracted, water phase and organic phase is separated, obtains
Nickel sulfate solution and organic phase containing cobalt, nickel；
4) preparation of nickel-cobalt-manganese ternary battery material presoma: the organic phase containing cobalt, nickel is stripped with sulfuric acid to be contained
The solution of cobalt, nickel supplements manganese salt, nickel salt, cobalt into the solution containing cobalt, nickel in nickel, cobalt, the ratio that manganese molar ratio is 8:1:1
One of salt is a variety of.
Further land used, the step 1) are as follows: by nickel sulfide concentrate and sulfuric acid in the ratio that liquid-solid ratio is 2:1-10:1 into
Row reaction, controls 25-95 DEG C of reaction temperature, reaction time 1-10h, sulfuric acid concentration 100-1000g/L；
Wherein, step 1) is separated by solid-liquid separation after the reaction was completed, and obtained filter residue is vulcanization copper ashes, and copper fire is used for after washes clean
Method is smelted.
Wherein, the step 2) are as follows: control reaction temperature is 150-200 DEG C, and maintaining partial pressure of oxygen in kettle is 0.1-1MPa, instead
1-5h between seasonable.
Wherein, the step 3) are as follows: air and/or oxygen are blasted into filtrate obtained by step 2), or hydrogen peroxide is added,
It maintains the pH of solution between 3-5, is separated by solid-liquid separation, then extractant is added in filtrate, the extraction after reacting 1-5h
Taking agent is one of P204, P507, Cyanex272 or a variety of, and extraction phase ratio (O/A) is 1:1-3:1 (volume ratio).
In the extractant, P204 and P507 are more easier to be stripped relative to Cyanex272, and cost wants low relatively.
Preferably, in step 3), the extractant and diluent are added together, and wherein the volume fraction of extractant is 20-
50%, the diluent is sulfonated kerosene.
Wherein, in step 4), sulphur is supplemented into the solution containing cobalt, nickel in nickel, cobalt, the ratio that manganese molar ratio is 1:1:1
One of sour manganese, nickel sulfate and cobaltous sulfate are a variety of, and the pH for adjusting mixed solution is to stir at 30-70 DEG C within the scope of 8-12
It mixes and reacts 1-5h, it is after separation of solid and liquid that washing of precipitate is obtained by drying to nickel-cobalt-manganese ternary battery material presoma.
It is highly preferred that the pH with ammonium hydroxide adjustment mixed solution is to stir at 60-70 DEG C within the scope of 8-10 in step 4)
React 3-5h.
The product that the method for the invention is prepared.
The beneficial effects of the present invention are:
Method proposed by the present invention smelts nickel sulfide ore first with existing hydrometallurgical technology, for nickel sulfide ore
Distinctive association feature is produced the presoma of lithium-ion-power cell, is directly obtained grain by the way of extraction, oxidation bonding
The iron oxide and nickel cobalt manganese hydroxide being evenly distributed are spent, is not needed using source of iron, nickel source, manganese source, cobalt source etc. in the prior art
The synthetic method reacted together, shortens reaction route, improves production efficiency, can substantially reduce lithium battery cost, promotes
The development of electric car.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
In the nickel sulfide concentrate that the present embodiment uses, Ni content is that 8.26%, Fe content is that 44.85%, S content is
35.2%, Cu content are that 1.9%, Co content is 0.31%, Al2O3Content is 0.2%, content of MgO 2.35%, SiO2Content
For 3.8% (being mass content).
(1) normal pressure acid decomposes:
Nickel sulfide concentrate and sulfuric acid are reacted in the ratio that liquid-solid ratio is 2:1, control 55 DEG C of reaction temperature, when reaction
Between 8h, wherein the concentration of sulfuric acid be 100g/L；It stands, is separated by solid-liquid separation after the reaction was completed, obtained filter residue is vulcanization copper ashes, washing
Copper pyrometallurgy is used for after clean, filtrate to be used for the processing of next step.
(2) preparation of LiFePO4 presoma:
Step (1) resulting filtrate is added in autoclave and is reacted, control reaction temperature is 150 DEG C, dimension
Holding partial pressure of oxygen in kettle is 0.1MPa, reaction time 2h；It is separated by solid-liquid separation after the reaction was completed, will be to make after residue washing drying
Standby LiFePO4 presoma.Gained filtrate prepares nickel-cobalt-manganese ternary presoma use for next step.
The granularity of gained presoma is 1-10 μm；Determine that its main component is Fe by elemental analysis2O3, purity is
99.2%, the rate of recovery to iron is 93.2%.
(3) extraction and separation: blasting air into filtrate obtained by step (2), maintain the pH of solution between 3-5, reacts 5h
After be separated by solid-liquid separation；80 (volume) % of (volume) %+ of extractant P507 20 sulfonated kerosene is added in filtrate and is extracted
It takes, control extraction is comparably O/A=1:1, separates water phase and organic phase obtains nickel sulfate solution and containing cobalt, nickel organic phase, sulfuric acid
Nickel solution can be used for preparing nickel sulfate product or other nickel products；It is stripped to obtain containing cobalt, nickel with sulfuric acid containing cobalt, nickel organic phase
Solution.
(4) preparation of nickel-cobalt-manganese ternary battery material presoma:
Suitable manganese sulfate and sulphur are supplemented into the solution containing cobalt, nickel in nickel, cobalt, the ratio that manganese molar ratio is 8:1:1
Sour nickel or cobaltous sulfate, then adjusting the pH of mixed solution with ammonium hydroxide is 9.5, and 3h is stirred to react at 60 DEG C, will be sunk after separation of solid and liquid
Shallow lake washing and drying obtains nickel-cobalt-manganese ternary battery material presoma.
Nickel-cobalt-manganese ternary battery material presoma obtained by elemental analysis, wherein Ni:Co:Mn (molar ratio)=8:1:1, granularity
It is 5-15 μm, the rate of recovery of cobalt is 95.4%.
Embodiment 2
In the nickel sulfide concentrate that the present embodiment uses, Ni content 7.5%, Fe42.12%, S content is 32.4%, Cu content
It is 0.27%, Al for 1.48%, Co content2O3Content is 0.31%, content of MgO 3.76%, SiO2Content is 4.6%.
(1) normal pressure acid decomposes:
Nickel sulfide concentrate and sulfuric acid are reacted in the ratio that liquid-solid ratio is 5:1, control 80 DEG C of reaction temperature, when reaction
Between 5h, wherein the concentration of sulfuric acid be 100g/L；It stands, is separated by solid-liquid separation after the reaction was completed, obtained filter residue is vulcanization copper ashes, washing
Copper pyrometallurgy is used for after clean, filtrate to be used for the processing of next step.
(2) preparation of LiFePO4 presoma:
Step (1) resulting filtrate is added in autoclave and is reacted, control reaction temperature is 150 DEG C, dimension
Holding partial pressure of oxygen in kettle is 0.5MPa, reaction time 2h；It is separated by solid-liquid separation after the reaction was completed, will be to make after residue washing drying
Standby LiFePO4 presoma.Gained filtrate prepares nickel-cobalt-manganese ternary presoma use for next step.
The granularity of gained presoma is 1-10 μm；Determine that its main component is Fe by elemental analysis2O3, purity 99%,
The rate of recovery to iron is 92.8%.
(3) extraction and separation:
Air is blasted into filtrate obtained by step (2), maintains the pH of solution between 3-5, carries out solid-liquid point after reacting 4h
From；75 (volume) % of (volume) %+ of extractant Cyanex272 25 sulfonated kerosene is added in filtrate and is extracted, control extraction
It takes and is comparably O/A=2:1, separate water phase and organic phase obtains nickel sulfate solution and containing cobalt, nickel organic phase, nickel sulfate solution is available
In preparing nickel sulfate product or other nickel products；It is stripped to obtain the solution containing cobalt, nickel with sulfuric acid containing cobalt, nickel organic phase.
(4) preparation of nickel-cobalt-manganese ternary battery material presoma:
Suitable manganese sulfate and sulphur are supplemented into the solution containing cobalt, nickel in nickel, cobalt, the ratio that manganese molar ratio is 8:1:1
Sour nickel or cobaltous sulfate, then adjusting the pH of mixed solution with ammonium hydroxide is 8, and 3h is stirred to react at 60 DEG C, it will precipitating after separation of solid and liquid
Washing and drying obtains nickel-cobalt-manganese ternary battery material presoma.
Nickel-cobalt-manganese ternary battery material presoma obtained by elemental analysis, wherein Ni:Co:Mn (molar ratio)=8:1:1, granularity
It is 5-15 μm, the rate of recovery of cobalt is 95.1%.
Embodiment 3
The nickel sulfide concentrate ingredient that the present embodiment uses is the same as embodiment 1.
(1) normal pressure acid decomposes:
Nickel sulfide concentrate and sulfuric acid are reacted in the ratio that liquid-solid ratio is 8:1, control 90 DEG C of reaction temperature, when reaction
Between 3h, wherein the concentration of sulfuric acid be 100g/L；It stands, is separated by solid-liquid separation after the reaction was completed, obtained filter residue is vulcanization copper ashes, washing
Copper pyrometallurgy is used for after clean, filtrate to be used for the processing of next step.
(2) preparation of LiFePO4 presoma:
Step (1) resulting filtrate is added in autoclave and is reacted, control reaction temperature is 150 DEG C, dimension
Holding partial pressure of oxygen in kettle is 0.5MPa, reaction time 2h；It is separated by solid-liquid separation after the reaction was completed, will be to make after residue washing drying
Standby LiFePO4 presoma.Gained filtrate prepares nickel-cobalt-manganese ternary presoma use for next step.
The granularity of gained presoma is 1-10 μm；Determine that its main component is Fe by elemental analysis2O3, purity is
99.1%, the rate of recovery to iron is 94.8%.
(3) extraction and separation:
Air is blasted into filtrate obtained by step (2), maintains the pH of solution between 3-5, carries out solid-liquid point after reacting 4h
From；Extractant P204 15 (volume) %+P507 15 (volume) %+ sulfonated kerosene 70 (volume) % is added in filtrate and is carried out
Extraction, control extraction are comparably O/A=3:1, separate water phase and organic phase obtains nickel sulfate solution and containing cobalt, nickel organic phase, sulphur
Sour nickel solution can be used for preparing nickel sulfate product or other nickel products；Containing cobalt, nickel organic phase with sulfuric acid be stripped to obtain containing cobalt,
The solution of nickel.
(4) preparation of nickel-cobalt-manganese ternary battery material presoma:
Suitable manganese sulfate and sulphur are supplemented into the solution containing cobalt, nickel in nickel, cobalt, the ratio that manganese molar ratio is 8:1:1
Sour nickel or cobaltous sulfate, then adjusting the pH of mixed solution with ammonium hydroxide is 8, and 4h is stirred to react at 70 DEG C, it will precipitating after separation of solid and liquid
Washing and drying obtains nickel-cobalt-manganese ternary battery material presoma.
Nickel-cobalt-manganese ternary battery material presoma obtained by elemental analysis, wherein Ni:Co:Mn (molar ratio)=8:1:1, granularity
It is 5-15 μm, the rate of recovery of cobalt is 95.8%.
Above embodiment be only preferred embodiments of the present invention will be described, not to the scope of the present invention into
Row limits, and without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technical side of the invention
The all variations and modifications that case is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (4)
1. a kind of method for preparing power battery anode material presoma with nickel sulfide concentrate, which is characterized in that comprising steps of
1) normal pressure acid decomposes: nickel sulfide concentrate and sulfuric acid being reacted in the ratio that liquid-solid ratio is 2:1-10:1, control reaction
25-95 DEG C of temperature, reaction time 1-10h, sulfuric acid concentration 100-1000g/L is separated by solid-liquid separation after the reaction was completed, and obtained filter residue is
Vulcanize copper ashes, filtrate is used for next step；
2) preparation of LiFePO4 presoma: the resulting filtrate of step 1) is added in autoclave and oxidizing gas
It is reacted, is separated by solid-liquid separation after the reaction was completed, will be to prepare LiFePO4 presoma, gained after residue washing drying
Filtrate prepares nickel-cobalt-manganese ternary presoma for next step；Controlling reaction temperature is 150-200 DEG C, and partial pressure of oxygen is in maintenance kettle
0.1-1MPa, reaction time 1-5h；
3) oxidation and extraction and separation: air and/or oxygen are blasted into filtrate obtained by step 2), or hydrogen peroxide is added, is maintained
The pH value of solution is separated by solid-liquid separation after reacting 1-5h between 3-5；Extractant is added in filtrate and is extracted, is separated
Water phase and organic phase obtain nickel sulfate solution and the organic phase containing cobalt, nickel；The extractant be one of P204, P507 or
A variety of, extraction phase ratio (O/A) is 1:1-3:1；The extractant and diluent are added together, and wherein the volume fraction of extractant is
20-50%, the diluent are sulfonated kerosene；4) preparation of nickel-cobalt-manganese ternary battery material presoma: the organic phase containing cobalt, nickel
Be stripped to obtain the solution containing cobalt, nickel with sulfuric acid, in nickel, cobalt, manganese molar ratio be 8:1:1 ratio to containing cobalt, nickel it is molten
One of manganese salt, nickel salt, cobalt salt or a variety of are supplemented in liquid.
2. the method according to claim 1, wherein step 1) is separated by solid-liquid separation after the reaction was completed, obtained filter residue
To vulcanize copper ashes, copper pyrometallurgy is used for after washes clean.
3. method according to claim 1 or 2, which is characterized in that be 8:1 by nickel, cobalt, manganese molar ratio in step 4):
1 ratio supplements one of manganese sulfate, nickel sulfate and cobaltous sulfate or a variety of into the solution containing cobalt, nickel, adjusts mixed solution
PH be to be stirred to react 1-5h at 30-70 DEG C within the scope of 8-12, arrive nickel cobalt manganese for washing of precipitate is obtained by drying after separation of solid and liquid
Ternary battery material presoma.
4. according to the method described in claim 3, it is characterized in that, the pH with ammonium hydroxide adjustment mixed solution is 8- in step 4)
In 10 ranges, 3-5h is stirred to react at 60-70 DEG C.
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| CN110615420B (en) * | 2019-09-17 | 2021-04-06 | 北京科技大学 | Method for preparing iron phosphate from laterite nickel ore leaching slag |
| CN112250120B (en) * | 2020-12-21 | 2021-04-02 | 矿冶科技集团有限公司 | Method for preparing ternary precursor and lithium carbonate by using waste lithium ion battery black powder and nickel cobalt sulfide ore in synergy mode and application |
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| CN101709374B (en) * | 2009-11-25 | 2011-05-11 | 中南大学 | Method for preparing precursors of lithium titanate and lithium iron phosphate by comprehensively using ilmenite |
| CN104701524A (en) * | 2015-03-03 | 2015-06-10 | 中南大学 | Method for directly preparing nickel-cobalt-manganese ternary cathode material precursor from nickel electrolyte |
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