CN110828803A - Method for preparing LCO/NCA composite positive electrode material - Google Patents

Method for preparing LCO/NCA composite positive electrode material Download PDF

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Publication number
CN110828803A
CN110828803A CN201911082929.2A CN201911082929A CN110828803A CN 110828803 A CN110828803 A CN 110828803A CN 201911082929 A CN201911082929 A CN 201911082929A CN 110828803 A CN110828803 A CN 110828803A
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lco
nca
preparing
positive electrode
placing
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唐月娇
张红梅
王储
陈晓涛
石斌
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Guizhou Meiling Power Supply Co Ltd
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Guizhou Meiling Power Supply 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
    • 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
    • H01M4/52—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
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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 the field of chemical energy storage batteries, in particular to a method for preparing an LCO/NCA composite positive electrode material, which is prepared by mixing LiCoO2(i.e., LCO), LiNi0.8Co0.15A10.05O2The method takes LCO and NCA as raw materials, combines wet ball milling and calcining methods to prepare the LCO/NCA composite material, and has synergistic effect among material components, thereby not only effectively improving the functions of platform voltage and rate capability, but also improving the function of gram specific capacity of the material.

Description

Method for preparing LCO/NCA composite positive electrode material
Technical Field
The invention relates to the field of chemical energy storage batteries, in particular to a method for preparing an LCO/NCA composite positive electrode material.
Background
In recent years, with the continuous development and progress of science and technology, various portable electronic devicesEquipment, electric vehicles, military weaponry and the like are rapidly developed, and increasingly high requirements are put on chemical power supplies, so that the power supplies are required to have high energy density and power density. LiCoO2The positive electrode material has Li+α -NaFeO of de-intercalation and diffusion process2Layer structure with high electron conductivity (about 10)-3S/cm), but more Li at high voltage+The specific discharge capacity can reach 180 mA.h.g after being separated from the crystal structure-1On the other hand, since the structure is destroyed by the large amount of lithium deintercalation, and the cycle performance and safety performance of the battery are affected, LiCoO is used under high-voltage charge and discharge conditions2The cycle performance of the lithium ion battery will be poor and the capacity will be quickly attenuated because the material will generate phase change and lattice oxygen deficiency under the high lithium removal state, which causes structural instability; in addition, the material and the electrolyte will react, which causes the dissolution of Co and other factors. Poor cycle performance and poor thermal stability of the battery, which limit LiCoO2The use of (1).
By using LiCoO2As a metal oxide, the lithium battery anode can be stored, and the specific energy index of 160Wh/kg is difficult to reach on the premise of ensuring the power performance and the storage life. LiCoO2The theoretical specific capacity of the material is 274 mAh/g. In practical application, due to the limitation of structural stability, at most half of lithium ions in crystal lattices can be extracted; therefore, the actual specific capacity can only reach about 145mAh/g along with LiCoO2The development of material technology, through optimizing synthesis conditions and controlling morphology and granularity, the tap density of the material is obviously improved from the original 1.8g/cm3The concentration is increased to 2.8g/cm3Even 3.0g/cm3This leads to a significant increase in the filling amount of the positive electrode material in the battery and an increase in the specific energy of the battery, subject to the state of the art, LiCoO2The material has great difficulty in further improving the specific energy of the battery. Currently, only through the research of new materials, the specific energy of the battery is further improved.
The nickel-based material has a longer life than the cobalt-based material which has been conventionally used, and the life of the material when 80% of the capacity is maintained is about 2 times that of the latter. Nickel groupThe adoption of the material not only prolongs the service life of the battery, but also is beneficial to improving the capacity. Proper amount of Co-Al is doped into LiNiO2In addition, the transformation degree of the material in the charging and discharging process can be inhibited, and the NCA (Li) can be improvedmNi1-x- yCoxAlyO2) Overcharge resistance and cycle performance of a battery which is a positive electrode material. In addition to high cycle stability, excellent charging performance and excellent storage capacity, batteries with NCA as the positive electrode material also have very low self-discharge. These properties all contribute to very good overall performance of such batteries throughout their life cycle. The specific capacity of the NCA anode material reaches about 190mAh/g, which is much higher than that of LiCoO2If the specific capacity of the lithium ion battery is 145mAh/g, partial LiCoO2 is replaced by the lithium ion battery, so that the weight of the battery can be reduced, the energy density is improved, and the price of Ni and Al is low, so that the production cost of the battery can be reduced, and better economic benefit is brought.
The composite anode material is a multiphase anode material formed by combining two or more substances with different physical and chemical properties, and each component in the composite anode material keeps relative independence, and has comprehensive performance generated by the synergistic effect of the components on the basis of keeping certain characteristics of each component material. At present, LiCoO is widely adopted2The structural stability and the surface state of the material are improved by doping and coating modification methods, so that the LiCoO can be greatly improved2Electrochemical performance at high voltage. LiNi in high-nickel ternary positive electrode material0.8Co0.15A10.05O2While maintaining high capacity and low cost characteristics, (NCA) materials have gained much attention in the industry due to their higher structural stability than other high nickel ternary materials, ternary materials with high nickel content (i.e., high nickel) can result in lithium-nickel mischarge, which can lead to lithium precipitation, leading to poor cycling and rate performance. And the redundant Li is easy to form soluble salts of lithium such as lithium carbonate and lithium hydroxide on the surface of the material, so that the pH value of the material is higher and alkaline, and the pole piece is easy to absorb water. For example, patent No. CN201710711402.6 fixes the nano particles of lithium iron manganese phosphate on the surface of ternary material particles by a mechanical fusion method to form a compact porous packageThe coating solves the problem that the ternary material and the lithium manganese phosphate anode material are easy to segregate due to different densities when mixed slurry of the ternary material and the lithium manganese phosphate anode material needs to be obtained in a slurry mixing stage in the mixed use process of the ternary material and the lithium manganese phosphate anode material in the prior art; the surface of the ternary material (especially a high-nickel ternary material) can be protected by the lithium manganese iron phosphate material, so that the ternary material is prevented from absorbing moisture in the environment and deteriorating, the direct contact between the ternary material and an electrolyte in a battery is reduced, and the stability and the cyclicity of the ternary material are improved.
Disclosure of Invention
The invention provides a method for preparing an LCO/NCA composite anode material to solve the technical problems.
The method is realized by the following technical scheme:
a method for preparing LCO/NCA composite anode material is to mix LiCoO2(i.e., LCO), LiNi0.8Co0.15A10.05O2(namely NCA) and a solvent are mixed and ball-milled, and then are naturally cooled, ground and sieved after primary constant-temperature heat treatment, inert gas treatment and secondary constant-temperature heat treatment; the temperature of the first constant temperature heat treatment is lower than that of the second constant temperature heat treatment.
The temperature of the first constant temperature heat treatment is 160-200 ℃, and the time is 5-6 h.
The temperature of the second constant temperature heat treatment is 500-700 ℃, and the time is 5-6 h.
The inert gas treatment time is 15-30 min.
A method for preparing LCO/NCA composite cathode material comprises the following steps:
(1) weighing LiCoO2、LiNi0.8Co0.15A10.05O2Placing the solvent in a pot ball mill for ball milling for 4-12 h; wherein m isSolvent(s):m(LCO+NCA)＝(0.1～0.3):1；
(2) Placing the ball milling tank in a blast drier for drying for 0.5-2 h to obtain a mixed material;
(3) putting the mixed material into a crucible, then putting the crucible into a blast drying oven, heating the crucible to 160-200 ℃, and carrying out heat preservation treatment for 5-6 h;
(4) placing the material obtained in the step (3) in a sealed tank for sealing and exhausting air, then introducing inert gas into the sealed tank for treatment for 15-30 min, then placing the sealed tank in a furnace body for heating to 500-700 ℃, and carrying out heat preservation treatment for 5-6 h;
(5) stopping heating, naturally cooling, grinding and sieving to obtain the LCO/NCA composite cathode material.
The solvent is any one of colorless methanol, colorless ethanol and acetone.
The inert gas is any one of high-purity nitrogen or argon.
The flow rate of the inert gas is 1.0-3.0 mol/min.
The LCO/NCA composite positive electrode material is used as a positive electrode active substance and is suitable for preparing a soft package half battery; the soft package half battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte; the positive electrode includes: a positive electrode active material, a conductive additive, and a binder; the negative electrode is any one of metal lithium or lithium-containing alloy; the electrolyte system is any one of organic liquid electrolyte, ionic liquid, gel polymer electrolyte and solid electrolyte.
Has the advantages that:
according to the invention, the LCO and the NCA are used as raw materials, a wet ball milling method and a calcining method are combined to prepare the LCO/NCA composite material, and the synergistic effect among the material components not only effectively improves the functions of platform voltage and rate capability, but also improves the function of the gram specific capacity of the material.
The invention has simple requirements on equipment, strong operability of the material preparation method and no pollution in the production process.
The specific capacity of the NCA anode material reaches 190mAh/g, which is much higher than that of LiCoO2The specific capacity of the alloy is 145mAh/g, and LiCoO is replaced by NCA2The weight of the battery is reduced, the energy density is improved, the prices of Ni and Al in NCA are low, and the production cost of the battery is reduced; LiCO2Having a two-dimensional layered structure, suitable for Li+Intercalation and deintercalation between layers, diffusion coefficientAbout 10- 11cm2(S), the rate performance is superior to that of an NCA material.
Drawings
FIG. 1 is an SEM image of LCO/NCA composite positive electrode materials prepared in examples 1-4;
FIG. 2 is a comparative XRD pattern of LCO/NCA composite positive electrode material, NCA material and LCO material prepared in examples 1-4;
FIG. 3 is a comparison graph of the first charge-discharge curves of the LCO/NCA composite positive electrode material, the NCA material and the LCO material prepared in examples 1-4 respectively as soft-package half-cell positive electrodes;
FIG. 4 is a 10C discharge curve of LCO/NCA composite positive electrode materials prepared in examples 1-4 as soft pack half cell positive electrodes;
FIG. 5 is an SEM image of LCO/NCA composite cathode material prepared by different methods in experimental example 2;
FIG. 6 is an EDS diagram of a composite cathode material M2 prepared by a calcination method in experimental example 2;
FIG. 7 is a 10C discharge curve diagram of a composite LCO/NCA positive electrode material prepared by different methods in test example 2 as a soft package half cell positive electrode;
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
XRD adopts an X-ray powder diffractometer (MiniFlex-600) developed by Rigaku instrument company, takes a copper target as an X-ray emitter, has the step length of 0.02, tests the prepared anode material at the scanning rate of 5 degrees/min between 10 degrees and 80 degrees, and finally analyzes the test result by using JADE 5.0;
the SEM adopts a scanning electron microscope (S-3400N) developed by Hitachi of Japan to perform morphology analysis on the prepared cathode material under different magnifications;
example 1
According to the mass ratio of 90: 10 respectively weighing NCA and LCO, placing the NCA and LCO into a ball milling tank, adding an ethanol solvent with the mass ratio of 0.25, carrying out ball milling for 6 hours, placing the nodular graphite tank into a forced air drying oven, drying for 1 hour at 60 ℃, sieving, placing the sieved LCO/NCA mixed material into a crucible, then placing the crucible into the forced air drying oven, heating to 160 ℃, keeping for 5 hours, then placing a cooling material into a sealing tank in a drying room, sealing, exhausting air, and introducing nitrogen into the sealing tank at the flow rate of 1.0mol/min as inert gas for 20 minutes; then placing the sealed tank in a muffle furnace, heating to 600 ℃ and keeping for 5 hours, then closing a heating switch of the muffle furnace, naturally cooling, grinding and sieving to obtain the LCO/NCA composite anode material containing 90 wt.% of NCA;
removing NMP as a solvent, superconducting carbon black (SP) and Carbon Nanotubes (CNTs) as conductive agents, Polytetrafluoroethylene (PVDF) as a binder, and mixing the components in a mass ratio of 91.5: 3: 2: 3.5 respectively uniformly stirring the prepared LCO/NCA composite anode material composite material with a conductive agent and a binder to prepare slurry, and coating the slurry on an aluminum foil current collector to obtain an anode plate; assembling a battery by taking metal lithium as a negative electrode, Celgard2325 as a diaphragm and HR-8315 type electrolyte as electrolyte;
the assembled battery is discharged at 0.2C and 10C multiplying power respectively, the discharge cut-off voltage is 2.5V, and the discharge specific capacity is 178.3mAh g < -1 > and 124.9mAh g < -1 > respectively.
Example 2
According to the mass ratio of 80: 20, respectively weighing NCA and LCO, placing the NCA and the LCO into a ball milling tank, adding an ethanol solvent with the mass ratio of 0.25, carrying out ball milling for 6 hours, placing the ball milled spherical tank into a forced air drying oven, drying for 1 hour at 60 ℃, sieving, placing the sieved LCO/NCA mixed material into a crucible, then placing the crucible into the forced air drying oven, heating to 160 ℃, keeping for 5 hours, then placing the cooled material into a sealing tank in a drying room, sealing, exhausting air, and introducing nitrogen into the sealing tank at the flow rate of 1mol/min as inert gas for 20 minutes; placing the sealed tank in a muffle furnace, heating to 600 ℃, keeping for 5h, then closing a heating switch of the muffle furnace, naturally cooling, grinding and sieving to obtain an LCO/NCA composite anode material containing 90 wt.% of NCA;
removing NMP as a solvent, superconducting carbon black (SP) and Carbon Nanotubes (CNTs) as conductive agents, Polytetrafluoroethylene (PVDF) as a binder, and mixing the components in a mass ratio of 91.5: 3: 2: 3.5 respectively uniformly stirring the prepared LCO/NCA composite positive electrode material composite material with a conductive agent and a binder to prepare slurry, and coating the slurry on an aluminum foil current collector to obtain a positive electrode plate; assembling a battery by taking a lithium belt as a negative electrode, Celgard2325 as a diaphragm and HR-8315 type electrolyte as electrolyte;
the assembled batteries were discharged at 0.2C and 10C rates, respectively, with a discharge cut-off voltage of 2.5V, and specific discharge capacities of 175.8mAh g-1 and 127.9mAh g-1 in examples 1-4, respectively.
Example 3
According to the mass ratio of 70: 30, respectively weighing NCA and LCO, placing the NCA and the LCO into a ball milling tank, adding an ethanol solvent with the mass ratio of 0.25, carrying out ball milling for 6 hours, placing the ball milled spherical tank into a forced air drying oven, drying for 1 hour at 60 ℃, sieving, placing the sieved LCO/NCA mixed material into a crucible, then placing the crucible into the forced air drying oven, heating to 160 ℃, keeping for 5 hours, then placing the cooled material into a sealing tank in a drying room, sealing, exhausting air, and introducing nitrogen into the sealing tank at the flow rate of 1mol/min as inert gas for 20 minutes; placing the sealed tank in a muffle furnace, heating to 600 ℃, keeping for 5h, then closing a heating switch of the muffle furnace, naturally cooling, grinding and sieving to obtain an LCO/NCA composite cathode material containing NCA90 wt%;
removing NMP as a solvent, superconducting carbon black (SP) and Carbon Nanotubes (CNTs) as conductive agents, Polytetrafluoroethylene (PVDF) as a binder, and mixing the components in a mass ratio of 91.5: 3: 2: 3.5 respectively uniformly stirring the prepared LCO/NCA composite positive electrode material composite material with a conductive agent and a binder to prepare slurry, and coating the slurry on an aluminum foil current collector to obtain a positive electrode plate; assembling a battery by taking a lithium belt as a negative electrode, Celgard2325 as a diaphragm and HR-8315 type electrolyte as electrolyte;
the assembled battery is discharged at 0.2C and 10C multiplying power respectively, the discharge cut-off voltage is 2.5V, and the first discharge specific capacity is 167.7mAh g < -1 > and 129.4mAh g < -1 > respectively.
Example 4
According to the mass ratio of 60: 40, respectively weighing NCA and LCO, placing the NCA and the LCO into a ball milling tank, adding an ethanol solvent with the mass ratio of 0.25, carrying out ball milling for 6 hours, placing the ball milling spherical tank into a forced air drying oven, drying for 1 hour at 60 ℃, sieving, placing the sieved LCO/NCA mixed material into a crucible, then placing the crucible into the forced air drying oven, heating to 160 ℃, keeping for 5 hours, then placing the cooled material into a sealing tank in a drying room, sealing, exhausting air, and introducing nitrogen into the sealing tank at the flow rate of 1mol/min as inert gas for 20 minutes. Heating the sealed tank in a muffle furnace to 600 ℃ for 5h, then closing a heating switch of the muffle furnace, naturally cooling, grinding and sieving to obtain an LCO/NCA composite cathode material containing 90 wt.% of NCA;
removing NMP as a solvent, superconducting carbon black (SP) and Carbon Nanotubes (CNTs) as conductive agents, Polytetrafluoroethylene (PVDF) as a binder, and mixing the components in a mass ratio of 91.5: 3: 2: 3.5 respectively uniformly stirring the prepared LCO/NCA composite positive electrode material composite material with a conductive agent and a binder to prepare slurry, and coating the slurry on an aluminum foil current collector to obtain a positive electrode plate; assembling a battery by taking a lithium belt as a negative electrode, Celgard2325 as a diaphragm and HR-8315 type electrolyte as electrolyte;
the assembled battery is discharged at 0.2C and 10C multiplying power respectively, the discharge cut-off voltage is 2.5V, and the first discharge specific capacity is 153.7mAh g < -1 > and 126.2mAh g < -1 > respectively.
Test example 1
From LiNi, the Applicant company0.8Co0.15A10.05O2、LiNi0.5Co0.2Mn0.3O2、LiNi0.6Co0.2Mn0.2O2、LiNi0.8Co0.1Mn0.1O2、LiNi0.8Co0.1Mn0.05A10.05O2And the like are respectively prepared into a positive electrode material with the LCO on the basis of the example 4, the positive electrode material is discharged at the rate of 10C, the discharge cut-off voltage is 2.5V, and the first discharge specific capacities are respectively 126.2, 103.4, 115.8, 109.1 and 112.6 mAh.g-1。
Test example 2
The applicant explores the influence of the process on the performance of the composite cathode material, and the specific method is as follows:
respectively preparing an LCO/NCA (4:6) composite anode material by ball milling and calcining, and researching the influence of the preparation method on the performance of the composite anode material;
ball milling method: mixing NCA and LCO according to a certain proportion, placing the mixture into a ball milling tank, carrying out ball milling for 12 hours, and sieving to obtain a composite anode material M1;
a calcining method: mixing NCA and LCO according to a certain proportion, placing the mixture in a ball milling tank by taking ethanol as a dispersion medium, carrying out ball milling for 6h, carrying out forced air drying at 60 ℃ for 1h, then drying at 160 ℃ for 5h, introducing nitrogen as inert gas into a sealed tank at a flow rate of 1mol/min for 20min, heating to 600 ℃ and keeping for 5h, and carrying out ball milling and sieving to obtain the composite cathode material M2.
SEM and EDS images show: the M1 and the M2 are made of two materials with different particle sizes, the large particles are spherical, the surfaces of the large particles are uneven, and the particle sizes are distributed in a range of 5-10 mu M; the material distribution of the two particle sizes in the M1 material is not very uniform; the material distribution of two kinds of particle sizes in the M2 material is relatively uniform, and the material with small particles is uniformly coated on the surface of the material with large particles. In an EDS diagram, a small particle material is LCO, and a large particle and spherical material is NCA;
as shown in fig. 7, the 10C discharge curve shows that the performance of the M2 material is slightly better than that of the M1 material, considering the gram specific capacity, the plateau voltage and other parameters of the material. This is mainly because LCO and NCA in M1 material are not uniformly dispersed, and do not form a good synergy; and LCO in the M2 material is uniformly coated on the surface of the NCA material, which is beneficial to the performance of the material.

Claims (8)

1. A method for preparing LCO/NCA composite anode material is characterized in that LiCoO is used2(i.e., LCO), LiNi0.8Co0.15A10.05O2(namely NCA) and a solvent are mixed and ball-milled, and then are naturally cooled, ground and sieved after primary constant-temperature heat treatment, inert gas treatment and secondary constant-temperature heat treatment; the temperature of the first constant temperature heat treatment is lower than that of the second constant temperature heat treatment.
2. The method for preparing the LCO/NCA composite cathode material according to claim 1, wherein the temperature of the first constant temperature heat treatment is 160 ℃ to 200 ℃ and the time is 5h to 6 h.
3. The method for preparing the LCO/NCA composite cathode material according to claim 1, wherein the temperature of the second constant temperature heat treatment is 500-700 ℃ and the time is 5-6 h.
4. The method for preparing the LCO/NCA composite cathode material according to claim 1, wherein the inert gas treatment time is 15-30 min.
5. The method of preparing an LCO/NCA composite positive electrode material of claim 1, comprising the steps of:
(1) weighing LiCoO2、LiNi0.8Co0.15A10.05O2Placing the solvent in a pot ball mill for ball milling for 4-12 h; wherein m isSolvent(s):m(LCO+NCA)＝(0.1～0.3):1；
(2) Placing the ball milling tank in a blast drier for drying for 0.5-2 h to obtain a mixed material;
(3) putting the mixed material into a crucible, then putting the crucible into a blast drying oven, heating the crucible to 160-200 ℃, and carrying out heat preservation treatment for 5-6 h;
(4) placing the material obtained in the step (3) in a sealed tank for sealing and exhausting air, then introducing inert gas into the sealed tank for treatment for 15-30 min, then placing the sealed tank in a furnace body for heating to 500-700 ℃, and carrying out heat preservation treatment for 5-6 h;
(5) stopping heating, naturally cooling, grinding and sieving to obtain the LCO/NCA composite cathode material.
6. The method for preparing an LCO/NCA composite cathode material according to claim 1 or 5, wherein the solvent is any one of colorless methanol, colorless ethanol and acetone.
7. The method for preparing an LCO/NCA composite positive electrode material according to claim 1 or 5, wherein the inert gas is any one of high purity nitrogen or argon.
8. The method for preparing an LCO/NCA composite positive electrode material according to claim 1 or 5, wherein the flow rate of the inert gas is 1.0 to 3.0 mol/min.
CN201911082929.2A 2019-12-24 2019-12-24 Method for preparing LCO/NCA composite positive electrode material Pending CN110828803A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102339981A (en) * 2011-09-23 2012-02-01 东莞新能源科技有限公司 Lithium ion battery and anode thereof
CN102544474A (en) * 2012-03-02 2012-07-04 宁波金和新材料股份有限公司 Preparation method for high-energy-density lithium battery positive pole composite material
CN106684358A (en) * 2017-01-18 2017-05-17 广西大学 Modifying method by coating surface of lithium-rich positive electrode material with alumina
CN107665983A (en) * 2017-08-07 2018-02-06 深圳市德方纳米科技股份有限公司 Anode material for lithium-ion batteries and preparation method thereof and lithium ion battery
CN110364703A (en) * 2019-06-11 2019-10-22 浙江吉利控股集团有限公司 A kind of composite material and preparation method thereof, anode, battery and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102339981A (en) * 2011-09-23 2012-02-01 东莞新能源科技有限公司 Lithium ion battery and anode thereof
CN102544474A (en) * 2012-03-02 2012-07-04 宁波金和新材料股份有限公司 Preparation method for high-energy-density lithium battery positive pole composite material
CN106684358A (en) * 2017-01-18 2017-05-17 广西大学 Modifying method by coating surface of lithium-rich positive electrode material with alumina
CN107665983A (en) * 2017-08-07 2018-02-06 深圳市德方纳米科技股份有限公司 Anode material for lithium-ion batteries and preparation method thereof and lithium ion battery
CN110364703A (en) * 2019-06-11 2019-10-22 浙江吉利控股集团有限公司 A kind of composite material and preparation method thereof, anode, battery and preparation method thereof

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