CN106025214A - Post-processing process for aluminium oxide-coated lithium cobalt oxide - Google Patents

Post-processing process for aluminium oxide-coated lithium cobalt oxide Download PDF

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CN106025214A
CN106025214A CN201610405547.9A CN201610405547A CN106025214A CN 106025214 A CN106025214 A CN 106025214A CN 201610405547 A CN201610405547 A CN 201610405547A CN 106025214 A CN106025214 A CN 106025214A
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alumina
lithium
cobalt acid
acid lithium
coated
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CN106025214B (en
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耿海龙
王振伟
胡博
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SHANDONG QIXING NEW MATERIALS TECHNOLOGY Co Ltd
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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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • 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
    • 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
    • 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

Abstract

The invention relates to a post-processing process for aluminium oxide-coated lithium cobalt oxide. The post-processing process comprises the following steps of taking a lithium carbonate water solution as the impregnation liquid; immersing the granules of the aluminium oxide-coated lithium cobalt oxide into the lithium carbonate solution, stirring and evaporating the solvent, filtering, and sintering the solid body obtained by the filtering, and naturally cooling to finish the post-processing of the aluminium oxide-coated lithium cobalt oxide. According to the post-processing process, the lithium carbonate water solution is used as the post-processing liquid; damage to the structure caused by the acid water solution in the wet coating process for lithium cobalt oxide by aluminium oxide can be avoided; the inert ingredients in the product are reduced; the proportion of the active materials in the product is improved; the product obtains a better electrochemical performance; and the charge-discharge capacity can be effectively increased.

Description

The aftertreatment technology of alumina-coated cobalt acid lithium
Technical field
The present invention relates to a kind of Olivine-type Cathode Material in Li-ion Batteries-Al2O3Cladding LiCoO2Aftertreatment technology, belong to lithium from Sub-battery material technical field.
Background technology
One of obstacle that the miniaturization of various high-end electronic products is maximum is the miniaturization of battery, and the miniaturization premise of battery is to have Sufficiently high energy density, therefore, pursuing high-energy-density the most just becomes the target of Study on Li-ion batteries person, developer；Lithium Ion battery candidate's positive electrode system is a lot, wherein, and cobalt acid lithium (LiCoO2) it is the main of high-end anode material for lithium-ion batteries Select, its available capacity can be improved by improving its charge cutoff voltage.
The main way improving cobalt acid lithium blanking voltage is exactly alumina-coated, and the advantage of alumina-coated is suitably by fertile material Isolating with electrolyte, the stability of protection fertile material structure, simultaneous oxidation aluminum self also has the lithium ion conducting energy that comparison is high Power, thus improve the high pressure ability to bear of cobalt acid lithium.
Many patents and document report alumina-coated lithium cobaltate cathode material.From the point of view of presently disclosed data, cladding process Mainly use organic aluminium salt as aluminum source.Such as: Daxian Zuo, Guanglei Tian, Da Chen, Hangyan Shen, Chunju Lv,Kangying Shu,Yufang Zhou,Comparative study of Al2O3-coated LiCoO2 electrode derived from different Al precursors:uniformity,microstructure and electrochemical properties, Electrochimica Acta 178(2015)447–457；Fei Zhao,Yufeng Tang,Junsheng Wang,Jianliya Tian, Honghua Ge,Baofeng Wang,Vapor-assisted synthesis of Al2O3-coated LiCoO2 for high-voltage lithium ion batteries,Electrochimica Acta 174(2015)384–390.Said method has and is evenly coated, does not damages Evil main body LiCoO2The advantage of performance, but shortcoming is it is also obvious that cost high (organic aluminium salt price is the highest), danger are high (organic aluminium salt has inflammable and explosive feature).
There is document to use aqueous aluminium salt as aluminum source, such as aluminum sulfate, the aqueous solution of aluminum nitrate, use the aluminum source of aqueous.Such as: Guimin Chen,Hailong Geng,Zhenwei Wang,Ruizhi Yang,Yanhui Xu,On electrochemistry of Al2O3-coated LiCoO2composite cathode with improved cycle stability,Ionics(2016) 22:629–636；Daxian Zuo,Guanglei Tian,Da Chen,Hangyan Shen,Chunju Lv,Kangying Shu, Yufang Zhou,Comparative study of Al2O3-coated LiCoO2 electrode derived from different Al precursors:uniformity,microstructure and electrochemical properties,Electrochimica Acta 178 (2015)447–457.Said method advantage is low cost, and safety is high, and shortcoming is that the acidity of aqueous aluminium salt is very strong, perishable LiCoO2, destroy the integrity of its surface texture, the proton meeting in water and LiCoO2In lithium ion exchanged, in structure introduce Proton impurity, the chemical property of the product after impact cladding.After destructurized, or there occurs the friendship of lithium ion and proton After changing, in the end product formed after Technology for Heating Processing subsequently, except LiCoO2Effective ingredient and cladding Al2O3In addition, the most a certain amount of cobalt oxide, its generation is just because in aluminum saline solution pretreatment process the structure occurred Destruction and lithium ion and the ion-exchange reactions of proton.
Reduce the meaning of the content of invalid inert component in final products, it is implicit that, so can improve effective appearance of cobalt acid lithium Amount.But, the probability that the technique of back coated aluminum oxide improves to avoid the formation of invalid element is the least；To The cobalt acid lithium finished product of coated aluminum oxide carries out further post processing to reduce invalid element content, almost solves the problems referred to above Unique channel.Fortunately, the structure destroyed in carrying out the technique of alumina-coated, and there is lithium ion and proton The process of exchange, is all in inside surface rather than the granule of cobalt acid lithium granule, so can be to the cobalt acid of alumina-coated Lithium carries out post processing, to improve its available capacity.
Summary of the invention
For the deficiencies in the prior art, the present invention provides the aftertreatment technology of a kind of alumina-coated cobalt acid lithium.Oxidation after process Aluminum cladding cobalt acid lithium can use as lithium ion secondary battery anode material.The present invention is directed alumina-coated cobalt acid lithium product Performance improvement, wherein the cobalt acid lithium of alumina-coated is to use liquid phase method, uses after aluminum nitrate aqueous solution impregnation process heat treatment again The product obtained.
Technical scheme is as follows:
The aftertreatment technology of a kind of alumina-coated cobalt acid lithium, comprises the following steps that
With lithium carbonate aqueous solution as impregnation liquid, alumina-coated cobalt acid lithium granule is immersed in Lithium carbonate solution, stirring evaporation solvent, Filter, filtration gained solid is sintered, natural cooling, i.e. completes the post processing of alumina-coated cobalt acid lithium.
According to the invention it is preferred to, the concentration of described lithium carbonate aqueous solution is 1.0～1.3wt%, carbon under further preferred room temperature The saturated aqueous solution of acid lithium.
According to the invention it is preferred to, the quality of alumina-coated cobalt acid lithium granule is (2～8) with the ratio of lithium carbonate aqueous solution volume: 500g/mL。
According to the invention it is preferred to, the temperature of stirring evaporation solvent is 60～90 DEG C.
According to the invention it is preferred to, the temperature of sintering is 650～750 DEG C, more preferably 700 DEG C；
Preferably, sintering time is 20～40min.
Alumina-coated cobalt acid lithium of the present invention can be prepared by prior art, it is preferred for preparing as follows:
It is (1～1.05) according to Li:Co mol ratio: 1 mixing Li2CO3And Co3O4, 1000 DEG C of air sinter 18 little Natural cooling time after, obtains LiCoO2；LiCoO by preparation2Immerse in the aluminum nitrate aqueous solution of 0.135mol/L, LiCoO2 Quality and the ratio of volume of aluminum nitrate aqueous solution be 1:20mg/mL；Then stirring evaporation at 80 DEG C, filters, obtains Solid in atmosphere 450 DEG C heat 3 hours, obtain after natural cooling product alumina cladding cobalt acid lithium (Al2O3-LiCoO2)。
The present invention uses lithium carbonate aqueous solution as aftertreatment fluid, is immersed in Lithium carbonate solution by alumina-coated cobalt acid lithium granule, Suitably evaporation solvent promotes lithium carbonate to separate out on the cobalt acid lithium product particle surface of alumina-coated；Then surface is made by heat treatment Invalid element cobalt oxide and lithium carbonate reaction, generate effective ingredient cobalt acid lithium.
Beneficial effects of the present invention is as follows:
The present invention uses lithium carbonate aqueous solution as aftertreatment fluid, solves cobalt acid lithium is carrying out acid in wet method coated aluminum oxide technique Property aqueous solution, to structural damage, decreases the inert fraction in product, improves the active substance accounting in product, make product There is higher chemical property, charge/discharge capacity can be effectively improved.
Detailed description of the invention
Below by specific embodiment, the present invention will be further described, but is not limited to this.
Embodiment 1:
It is 1:1 mixing Li according to Li:Co mol ratio2CO3And Co3O4, natural after sintering 18 hours in 1000 DEG C of air Cooling；The LiCoO of preparation2The aluminum nitrate aqueous solution (milliliter number) of quality (milligram number) and 0.135mol/L is joined according to 1:20 Ratio, by LiCoO2Immerse in aluminum nitrate aqueous solution, stirring evaporation at 80 DEG C, the precipitate finally obtained in atmosphere 450 Degree heating 3 hours, obtains product Al after natural cooling2O3-LiCoO2。
By 5 grams of product Al processed2O3-LiCoO2Immerse in 500 milliliters of unsaturated carbonate lithium solution, at 80 DEG C, stir evaporation 5 After minute, filtration product is dried, and sinters half an hour at 700 DEG C the most again, and natural cooling obtains last product.
Using last product as positive active material, according to active substance: PVDF:SuperP mass ratio is that 8:1:1 is prepared as Positive pole, negative pole is lithium sheet, and electrolyte is 1M LiPF6/EC+DMC, and barrier film is Celgad2400 barrier film, is assembled into 2032 Simulated battery, under 0.1C multiplying power, 3.0-4.30V voltage range, recording capacity first is 142mAh/g, circulates 150 times Rear capacity is 116mAh/g；3.0-4.55V voltage range, recording capacity first is 161mAh/g, capacity after circulating 150 times For 108mAh/g；
Comparative example 1:
Untreated Al2O3-LiCoO2Sample, as positive pole, is assembled into test result after battery, under 0.1C multiplying power, and 3.0-4.30V Voltage range, recording capacity first is 107mAh/g, and after circulating 150 times, capacity is 95mAh/g；3.0-4.55V voltage range, Recording capacity first is 140mAh/g, and after circulating 150 times, capacity is 72mAh/g；
Embodiment 2:
It is 1.01:1 mixing Li according to Li:Co mol ratio2CO3And Co3O4, after sintering 18 hours in 1000 DEG C of air certainly So cooling；The LiCoO of preparation2The aluminum nitrate aqueous solution (milliliter number) of quality (milligram number) and 0.135M is joined according to 1:20 Ratio, by LiCoO2Immerse in aluminum nitrate aqueous solution, stirring evaporation at 80 DEG C, the precipitate finally obtained in atmosphere 450 DEG C heating 3 hours, obtain product Al2O3-LiCoO2 after natural cooling.
By 5 grams of product Al processed2O3-LiCoO2Immerse in 500 milliliters of unsaturated carbonate lithium solution, at 80 DEG C, stir evaporation 5 After minute, filtration product is dried, and sinters half an hour at 700 degree the most again, and natural cooling obtains last product.
Using last product as positive active material, according to active substance: PVDF:SuperP mass ratio is that 8:1:1 is prepared as Positive pole, negative pole is lithium sheet, and electrolyte is 1M LiPF6/EC+DMC, and barrier film is Celgad2400 barrier film, is assembled into 2032 Simulated battery, under 0.1C multiplying power, 3.0-4.30V voltage range, recording capacity first is 137mAh/g, circulates 150 times Rear capacity is 120mAh/g；3.0-4.55V voltage range, recording capacity first is 171mAh/g, capacity after circulating 150 times For 112mAh/g；
Comparative example 2:
Untreated Al2O3-LiCoO2Sample, as positive pole, is assembled into test result after battery, under 0.1C multiplying power, and 3.0-4.30V Voltage range, recording capacity first is 106.1mAh/g, and after circulating 150 times, capacity is 94mAh/g；3.0-4.55V voltage model Enclosing, recording capacity first is 139.1mAh/g, and after circulating 150 times, capacity is 75.5mAh/g；
Embodiment 3:
It is 1.02:1 mixing Li according to Li:Co mol ratio2CO3And Co3O4, after sintering 18 hours in 1000 DEG C of air certainly So cooling；The LiCoO of preparation2The aluminum nitrate aqueous solution (milliliter number) of quality (milligram number) and 0.135M is joined according to 1:20 Ratio, by LiCoO2Immerse in aluminum nitrate aqueous solution, stirring evaporation at 80 DEG C, the precipitate finally obtained in atmosphere 450 DEG C heating 3 hours, obtain product Al after natural cooling2O3-LiCoO2。
By 5 grams of product Al processed2O3-LiCoO2Immerse in 500 milliliters of unsaturated carbonate lithium solution, at 80 DEG C, stir evaporation 5 After minute, filtration product is dried, and sinters half an hour at 700 degree the most again, and natural cooling obtains last product.
Using last product as positive active material, according to active substance: PVDF:SuperP mass ratio is that 8:1:1 is prepared as Positive pole, negative pole is lithium sheet, and electrolyte is 1M LiPF6/EC+DMC, and barrier film is Celgad2400 barrier film, is assembled into 2032 Simulated battery, under 0.1C multiplying power, 3.0-4.30V voltage range, recording capacity first is 142.3mAh/g, circulates 150 times Rear capacity is 115.8mAh/g；3.0-4.55V voltage range, recording capacity first is 165mAh/g, capacity after circulating 150 times For 105.6mAh/g；
Comparative example 3:
Untreated Al2O3-LiCoO2Sample, as positive pole, is assembled into test result after battery, under 0.1C multiplying power, and 3.0-4.30V Voltage range, recording capacity first is 114.3mAh/g, and after circulating 150 times, capacity is 89mAh/g；3.0-4.55V voltage model Enclosing, recording capacity first is 148mAh/g, and after circulating 150 times, capacity is 76mAh/g；
Embodiment 4:
It is 1.03:1 mixing Li according to Li:Co mol ratio2CO3And Co3O4, after sintering 18 hours in 1000 DEG C of air certainly So cooling；The LiCoO of preparation2The aluminum nitrate aqueous solution (milliliter number) of quality (milligram number) and 0.135M is joined according to 1:20 Ratio, immerses LiCoO2 in aluminum nitrate aqueous solution, stirring evaporation at 80 DEG C, the precipitate finally obtained in atmosphere 450 Degree heating 3 hours, obtains product Al after natural cooling2O3-LiCoO2。
By 5 grams of product Al processed2O3-LiCoO2Immerse in 500 milliliters of unsaturated carbonate lithium solution, at 80 DEG C, stir evaporation 5 After minute, filtration product is dried, and sinters half an hour at 700 DEG C the most again, and natural cooling obtains last product.
Using last product as positive active material, according to active substance: PVDF:SuperP mass ratio is that 8:1:1 is prepared as Positive pole, negative pole is lithium sheet, and electrolyte is 1M LiPF6/EC+DMC, and barrier film is Celgad2400 barrier film, is assembled into 2032 Simulated battery, under 0.1C multiplying power, 3.0-4.30V voltage range, recording capacity first is 138mAh/g, circulates 150 times Rear capacity is 118.1mAh/g；3.0-4.55V voltage range, recording capacity first is 169mAh/g, capacity after circulating 150 times For 123.0mAh/g；
Comparative example 4:
Untreated Al2O3-LiCoO2Sample, as positive pole, is assembled into test result after battery, under 0.1C multiplying power, and 3.0-4.30V Voltage range, recording capacity first is 117.8mAh/g, and after circulating 150 times, capacity is 88mAh/g；3.0-4.55V voltage model Enclosing, recording capacity first is 147mAh/g, and after circulating 150 times, capacity is 82mAh/g；
Embodiment 5:
It is 1.04:1 mixing Li according to Li:Co mol ratio2CO3And Co3O4, after sintering 18 hours in 1000 DEG C of air certainly So cooling；The LiCoO of preparation2The aluminum nitrate aqueous solution (milliliter number) of quality (milligram number) and 0.135M is joined according to 1:20 Ratio, by LiCoO2Immerse in aluminum nitrate aqueous solution, stirring evaporation at 80 DEG C, the precipitate finally obtained in atmosphere 450 Degree heating 3 hours, obtains product Al after natural cooling2O3-LiCoO2。
By 5 grams of product Al processed2O3-LiCoO2Immerse in 500 milliliters of unsaturated carbonate lithium solution, at 80 DEG C, stir evaporation 5 After minute, filtration product is dried, and sinters half an hour at 700 DEG C the most again, and natural cooling obtains last product.
Using last product as positive active material, according to active substance: PVDF:SuperP mass ratio is that 8:1:1 is prepared as Positive pole, negative pole is lithium sheet, and electrolyte is 1M LiPF6/EC+DMC, and barrier film is Celgad2400 barrier film, is assembled into 2032 Simulated battery, under 0.1C multiplying power, 3.0-4.30V voltage range, recording capacity first is 143mAh/g, circulates 150 times Rear capacity is 117mAh/g；3.0-4.55V voltage range, recording capacity first is 163.2mAh/g, capacity after circulating 150 times For 121.3mAh/g；
Comparative example 5:
Untreated Al2O3-LiCoO2Sample, as positive pole, is assembled into test result after battery, under 0.1C multiplying power, and 3.0-4.30V Voltage range, recording capacity first is 134.8mAh/g, and after circulating 150 times, capacity is 107.0mAh/g；3.0-4.55V voltage Scope, recording capacity first is 159.9mAh/g, and after circulating 150 times, capacity is 101.1mAh/g；
Embodiment 6:
It is 1.05:1 mixing Li according to Li:Co mol ratio2CO3And Co3O4, after sintering 18 hours in 1000 DEG C of air certainly So cooling；The LiCoO of preparation2The aluminum nitrate aqueous solution (milliliter number) of quality (milligram number) and 0.135M is joined according to 1:20 Ratio, by LiCoO2Immerse in aluminum nitrate aqueous solution, stirring evaporation at 80 DEG C, the precipitate finally obtained in atmosphere 450 DEG C heating 3 hours, obtain product Al after natural cooling2O3-LiCoO2。
By 5 grams of product Al processed2O3-LiCoO2Immerse in 500 milliliters of unsaturated carbonate lithium solution, at 80 DEG C, stir evaporation 5 After minute, filtration product is dried, and sinters half an hour at 700 degree the most again, and natural cooling obtains last product.
Using last product as positive active material, according to active substance: PVDF:SuperP mass ratio is that 8:1:1 is prepared as Positive pole, negative pole is lithium sheet, and electrolyte is 1M LiPF6/EC+DMC, and barrier film is Celgad2400 barrier film, is assembled into 2032 Simulated battery, under 0.1C multiplying power, 3.0-4.30V voltage range, recording capacity first is 141.2mAh/g, circulates 150 times Rear capacity is 119mAh/g；3.0-4.55V voltage range, recording capacity first is 169.9mAh/g, capacity after circulating 150 times For 122mAh/g；
Comparative example 6:
Untreated Al2O3-LiCoO2Sample, as positive pole, is assembled into test result after battery, under 0.1C multiplying power, and 3.0-4.30V Voltage range, recording capacity first is 136mAh/g, and after circulating 150 times, capacity is 120mAh/g；3.0-4.55V voltage model Enclosing, recording capacity first is 163.9mAh/g, and after circulating 150 times, capacity is 100mAh/g；
From embodiment 1～6 and comparative example 1～6 it can be seen that after unsaturated carbonate lithium solution impregnation post processing, the product obtained The electrochemistry capacitance of thing is significantly improved.Reason is that this aftertreatment technology " has been repaired " invalid cobalt oxide in structure and become Point, improve the purity of material, and then be effectively improved charge/discharge capacity.

Claims (8)

1. an aftertreatment technology for alumina-coated cobalt acid lithium, comprises the following steps that
With lithium carbonate aqueous solution as impregnation liquid, alumina-coated cobalt acid lithium granule is immersed in Lithium carbonate solution, stirring evaporation solvent, Filter, filtration gained solid is sintered, natural cooling, i.e. completes the post processing of alumina-coated cobalt acid lithium.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 1, it is characterised in that described lithium carbonate The concentration of aqueous solution is 1.0～1.3wt%.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 1, it is characterised in that described carbonic acid Lithium aqueous solution is the saturated aqueous solution of lithium carbonate under room temperature.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 1, it is characterised in that alumina-coated The quality of cobalt acid lithium granule is (2～8): 500g/mL with the ratio of lithium carbonate aqueous solution volume.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 1, it is characterised in that stirring evaporation is molten The temperature of agent is 60～90 DEG C.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 1, it is characterised in that the temperature of sintering It it is 650～750 DEG C.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 6, it is characterised in that the temperature of sintering It it is 700 DEG C.
The aftertreatment technology of alumina-coated cobalt acid lithium the most according to claim 1, it is characterised in that sintering time is 20～40min.
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CN112661199A (en) * 2020-12-24 2021-04-16 浙江中金格派锂电产业股份有限公司 Preparation method of high-tap-density aluminum oxide coated magnesium-manganese co-doped cobaltosic oxide

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