CN113793928A - Modified ternary cathode material and preparation method and application thereof - Google Patents
Modified ternary cathode material and preparation method and application thereof Download PDFInfo
- Publication number
- CN113793928A CN113793928A CN202111062016.1A CN202111062016A CN113793928A CN 113793928 A CN113793928 A CN 113793928A CN 202111062016 A CN202111062016 A CN 202111062016A CN 113793928 A CN113793928 A CN 113793928A
- Authority
- CN
- China
- Prior art keywords
- cathode material
- ternary
- solution
- ternary cathode
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010406 cathode material Substances 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims abstract description 70
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000178 monomer Substances 0.000 claims abstract description 32
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 23
- 239000007774 positive electrode material Substances 0.000 claims abstract description 18
- 239000012043 crude product Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000005457 ice water Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229910001416 lithium ion Inorganic materials 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 32
- 229920000128 polypyrrole Polymers 0.000 abstract description 19
- 239000003792 electrolyte Substances 0.000 abstract description 18
- 238000007086 side reaction Methods 0.000 abstract description 17
- 239000000243 solution Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000010287 polarization Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 238000003487 electrochemical reaction Methods 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 235000010413 sodium alginate Nutrition 0.000 description 2
- 229940005550 sodium alginate Drugs 0.000 description 2
- 239000000661 sodium alginate Substances 0.000 description 2
- 229910001428 transition metal ion Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H01M4/364—Composites as mixtures
-
- 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
-
- 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 provides a modified ternary cathode material and a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) mixing a pyrrole monomer and a solvent to obtain a solution, mixing a ternary positive electrode material with the solution, and adding an ammonium persulfate solution to react to obtain a crude product; (2) and carrying out heat treatment on the crude product to obtain the modified ternary cathode material. According to the invention, polypyrrole is doped in the ternary cathode material, so that the side reaction between the ternary material and the electrolyte is inhibited, the electronic conductivity of the ternary material can be improved, and the cycle performance and the rate performance of the ternary cathode material are improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a modified ternary cathode material, and a preparation method and application thereof.
Background
With the rapid development of new energy industries in recent years, especially the rapid development of electric automobiles, the requirements of the power battery on the cycling stability and the specific capacity are higher and higher. Among many positive electrode material systems, ternary materials are highly favored by battery manufacturers and host manufacturers due to their high capacity density, and are gradually becoming the preferred positive electrode material for power batteries.
The ternary material also faces some problems to be solved in practical application, such as particle surface of the ternary material during chargingTransition metal ion (Ni) of high valence state4+、Co4+) The electrolyte has strong oxidizability, is easy to generate a series of side reactions with the electrolyte, and simultaneously, along with the progress of electrochemical reaction, metal ions on the surface of the negative electrode are reduced to metal simple substances, so that the polarization of the battery is increased, and the capacity attenuation of the battery is accelerated.
CN109378469A discloses a preparation method of a ternary cathode material and preparation methods of the ternary cathode material, a lithium ion battery and an electric vehicle ternary cathode material, which are prepared by the preparation method, and comprise the following steps: uniformly mixing the ternary precursor, a lithium source and a fluxing agent, and sintering once to obtain a single-crystal-like ternary cathode material; and then adding the quasi-single-crystal ternary cathode material into the alumina-titania sol mixed solution, heating and evaporating the solution to dryness, and performing secondary sintering to obtain the aluminum-titanium-coated quasi-single-crystal ternary cathode material. The electron conductivity of the ternary cathode material is low.
CN112713261A discloses a preparation method of a ternary cathode material, which comprises the following steps: mixing a sodium alginate solution with a solution containing lithium salt and other metal salts to form a mixed solution, and drying the mixed solution to obtain a precursor of the ternary cathode material; roasting the precursor of the ternary cathode material to obtain the ternary cathode material; ammonia water is not added in the preparation method of the ternary cathode material; the other metal is a metal which can be coordinated with sodium alginate. The transition metal ions in high valence state in the ternary positive electrode material have strong oxidability, are easy to generate a series of side reactions with electrolyte, and simultaneously, along with the progress of electrochemical reaction, the metal ions on the surface of the negative electrode are reduced to metal simple substances, so that the polarization of the battery is increased, and the capacity attenuation of the battery is accelerated.
The scheme has the problem of poor electron conductivity or polarization caused by the fact that transition metal ions are easy to react with electrolyte, so that the development of a ternary cathode material which is good in electron conductivity and can avoid polarization of a battery is necessary.
Disclosure of Invention
The modified ternary cathode material is doped with polypyrrole, so that side reactions between the ternary material and an electrolyte are inhibited, the electronic conductivity of the ternary material can be improved, and the cycle performance and the rate capability of the ternary cathode material are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a preparation method of a modified ternary cathode material, which comprises the following steps:
(1) mixing a pyrrole monomer and a solvent to obtain a solution, mixing a ternary positive electrode material with the solution, and adding an ammonium persulfate solution to react to obtain a crude product;
(2) and carrying out heat treatment on the crude product to obtain the modified ternary cathode material.
The polypyrrole is doped and coated in the ternary positive electrode material, so that a layer of inert substance can be deposited on the surface of the ternary material, the direct contact between the positive electrode material and electrolyte is isolated, the side reaction between the positive electrode material and the electrolyte is reduced, the conductivity of the material can be increased while the side reaction is reduced, the surface resistance of the material can be reduced, the side reaction between the ternary material and the electrolyte can be inhibited by doping and coating of the polypyrrole, the electronic conductivity of the material is improved, and the rate capability and the cycle performance of the ternary material are improved.
Preferably, the solvent of step (1) comprises an ethanol-water solution.
Preferably, in the ethanol-water solution, the mass fraction of ethanol is 20-30%, for example: 20%, 22%, 25%, 27%, 30%, etc.
Preferably, the molar concentration of the pyrrole monomer in the solution is 0.1-0.3 mol/L, such as: 0.1mol/L, 0.15mol/L, 0.2mol/L, 0.25mol/L or 0.3mol/L, etc.
Preferably, the mass ratio of the pyrrole monomer to the ternary cathode material is (0.01-0.03): 1, such as: 0.01:1, 0.015:1, 0.02:1, 0.025:1, 0.03:1, etc.
If the mass ratio of the pyrrole monomer to the ternary cathode material is too large, the polypyrrole doped on the surface of the ternary cathode material has negative effects on the performance of the material (such as side reaction with electrolyte and accelerated cycle performance attenuation), and if the mass ratio of the pyrrole monomer to the ternary cathode material is too small, the amount of the doped polypyrrole is small, and the effect of improving the performance of the ternary cathode material is not obvious.
Preferably, the mass ratio of the pyrrole monomer to the ammonium persulfate in the step (1) is (0.18-0.35): 1, such as: 0.18:1, 0.2:1, 0.24:1, 0.28:1, 0.3:1, or 0.35:1, etc.
If the mass ratio of the pyrrole monomer to the ammonium persulfate is too large, pyrrole cannot react sufficiently to generate polypyrrole and cannot meet the doping effect of the ternary cathode material, and if the mass ratio of the pyrrole monomer to the ammonium persulfate is too small, the generation of polypyrrole is inhibited, and other side reactions are easily accompanied to have negative effects on the material performance.
Preferably, the stirring speed of the ammonium persulfate solution is 300-800 rpm, for example: 300rpm, 400rpm, 500rpm, 600rpm, 700rpm, 800rpm, or the like.
Preferably, the atmosphere of the ammonium persulfate solution is nitrogen.
Preferably, the reaction of step (1) is carried out in an ice-water bath.
Preferably, the reaction time is 8-12 h, such as: 8h, 9h, 10h, 11h or 12h and the like.
Preferably, the reaction is followed by filtration.
Preferably, the temperature of the heat treatment in the step (2) is 150-250 ℃, for example: 150 ℃, 180 ℃, 200 ℃, 230 ℃, or 250 ℃ and the like.
Preferably, the time of the heat treatment is 2-4 h, for example: 2h, 2.5h, 3h, 3.5h or 4h and the like.
In a second aspect, the present invention provides a modified ternary cathode material prepared by the method of the first aspect.
The modified ternary positive electrode material is doped with the coated polypyrrole, so that metal ions on the surface of the negative electrode are prevented from being reduced to metal simple substances along with the progress of electrochemical reaction, and further polarization increase of the battery and capacity attenuation acceleration of the battery can be avoided.
In a third aspect, the invention provides a positive electrode plate, which comprises the modified ternary positive electrode material as described in the second aspect.
In a fourth aspect, the invention provides a lithium ion battery, which comprises the positive electrode plate according to the third aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) the polypyrrole is doped and coated in the ternary positive electrode material, so that a layer of inert substance can be deposited on the surface of the ternary material to isolate the positive electrode material from being directly contacted with electrolyte, the side reaction of the positive electrode material and the electrolyte is reduced, the conductivity of the material can be increased while the side reaction is reduced, and the surface resistance of the material is reduced.
(2) According to the invention, polypyrrole is doped in the ternary material, so that the side reaction between the ternary material and the electrolyte can be inhibited by doping the polypyrrole, and the electronic conductivity of the material is improved, thereby improving the rate capability and the cycle performance of the ternary material.
(3) The preparation method is simple, low in energy consumption and easy for industrial production.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a modified ternary cathode material, and the preparation method of the modified ternary cathode material comprises the following steps:
(1) dissolving a pyrrole monomer in an ethanol-water solvent with the mass concentration of 25% of ethanol to form a solution with the concentration of 0.2mol/L, mixing a ternary cathode material with the solution, wherein the mass ratio of the pyrrole monomer to the ternary cathode material is 0.02:1, stirring at the speed of 500rpm under the stirring state of nitrogen protection, slowly adding an ammonium persulfate solution into the prepared solution, wherein the mass ratio of the pyrrole monomer to ammonium persulfate is 0.2:1, reacting for 10 hours in an ice-water bath, and filtering to obtain a crude product;
(2) and carrying out heat treatment on the crude product at 200 ℃ for 3h to obtain the modified ternary cathode material.
Example 2
The embodiment provides a modified ternary cathode material, and the preparation method of the modified ternary cathode material comprises the following steps:
(1) dissolving a pyrrole monomer in an ethanol-water solvent with the mass concentration of 27% of ethanol to form a solution with the concentration of 0.1mol/L, mixing a ternary cathode material with the solution, wherein the mass ratio of the pyrrole monomer to the ternary cathode material is 0.01:1, stirring at the speed of 600rpm under the stirring state of nitrogen protection, slowly adding an ammonium persulfate solution into the prepared solution, wherein the mass ratio of the pyrrole monomer to ammonium persulfate is 0.2:1, reacting for 10 hours in an ice-water bath, and filtering to obtain a crude product;
(2) and carrying out heat treatment on the crude product at 220 ℃ for 3h to obtain the modified ternary cathode material.
Example 3
The embodiment provides a modified ternary cathode material, and the preparation method of the modified ternary cathode material comprises the following steps:
(1) dissolving a pyrrole monomer in an ethanol-water solvent to form a solution with the concentration of 0.3mol/L, mixing a ternary cathode material with the solution, wherein the mass ratio of the pyrrole monomer to the ternary cathode material is 0.03:1, stirring at the speed of 600rpm under the stirring state of nitrogen protection, slowly adding an ammonium persulfate solution into the prepared solution, wherein the mass ratio of the pyrrole monomer to the ammonium persulfate is 0.2:1, reacting for 10 hours in an ice-water bath, and filtering to obtain a crude product;
(2) and carrying out heat treatment on the crude product at 260 ℃ for 3h to obtain the modified ternary cathode material.
Example 4
The difference between the embodiment and the embodiment 1 is only that the mass ratio of the pyrrole monomer and the ammonium persulfate in the step (1) is 0.18:1, and other conditions and parameters are completely the same as those in the embodiment 1.
Example 5
The difference between the embodiment and the embodiment 1 is only that the mass ratio of the pyrrole monomer and the ammonium persulfate in the step (1) is 0.35:1, and other conditions and parameters are completely the same as those in the embodiment 1.
Comparative example 1
This comparative example differs from example 1 only in that no pyrrole was added in step (1) and the other conditions and parameters were exactly the same as in example 1.
And (3) performance testing:
taking the ternary positive electrode materials obtained in the examples 1-5 and the comparative example 1, preparing a positive plate, assembling the positive plate with the same negative plate, a diaphragm and electrolyte to form a test battery, and performing electrochemical test by using a blue light tester, wherein the method specifically comprises the following steps:
testing the initial specific capacity: and (3) carrying out a charge-discharge test on the obtained battery at the temperature of 25 +/-2 ℃, wherein the charge-discharge test voltage is 2.8-4.35V, the charge-discharge current density is 1.0C, and the capacity of the anode material is tested by 1C gram.
And (3) rate performance test: and (3) performing a charge-discharge test at the temperature of 25 +/-2 ℃, wherein the charge-discharge voltage is 2.8-4.35V, the discharge current density is 1C and 5C respectively, and the discharge capacity at the 5C multiplying power is divided by the discharge capacity at the 1C multiplying power, so that the larger the obtained numerical value is, the better the multiplying power performance of the anode material is.
And (3) testing the cycle performance: charging the battery to a cut-off voltage of 4.35V at a constant current of 1C under the environment of 25 +/-2 ℃, then charging at a constant voltage until the current reaches 0.05C, stopping charging, and standing for 30 min; the discharge was discharged at a constant current of 1C to a cut-off voltage of 2.8V. The discharge capacity at the first circle is recorded as E1, the discharge capacity at the second circle is recorded as E2, and E2/E1 is the capacity cycle retention rate at 100 circles after 100 cycles of charge and discharge cycles, and the test results are shown in Table 1:
TABLE 1
As can be seen from Table 1, in examples 1-5, the first cycle coulombic efficiency of the battery made of the modified ternary cathode material of the invention can reach more than 88.5%, the gram capacity of the cathode can reach more than 166.0mAh/g, the 5C/1C percentage can reach more than 96.1%, and the cycle retention rate of 100 cycles can reach more than 99.0%.
The comparison of the embodiments 1 to 3 shows that the mass ratio of the pyrrole monomer to the ternary cathode material affects the performance of the prepared modified ternary cathode material, the mass ratio of the pyrrole monomer to the ternary cathode material is controlled to be (0.01-0.03): 1, so that the modified ternary cathode material with excellent performance can be prepared, if the mass ratio of the pyrrole monomer to the ternary cathode material is too large, the surface of the ternary cathode material doped with polypyrrole has negative effects on the performance of the material (such as side reactions with electrolyte and accelerated cycle performance attenuation), and if the mass ratio of the pyrrole monomer to the ternary cathode material is too small, the amount of doped polypyrrole is small, and the effect on the performance improvement of the ternary cathode material is not obvious.
As can be seen from Table 1, by comparing the embodiment 1 with the embodiments 4 to 5, the quality ratio of the pyrrole monomer to the ammonium persulfate can affect the performance of the prepared modified ternary cathode material, the quality ratio of the pyrrole monomer to the ammonium persulfate is controlled to be (0.18-0.35): 1, the modified ternary cathode material with excellent performance can be prepared, if the quality ratio of the pyrrole monomer to the ammonium persulfate is too large, the pyrrole can not fully react to generate the polypyrrole and the doping effect of the ternary cathode material can not be met, and if the quality ratio of the pyrrole monomer to the ammonium persulfate is too small, the generation of the polypyrrole can be inhibited, and other side reactions can easily have negative effects on the material performance.
Compared with the comparative example 1, the polypyrrole is doped in the ternary material, so that on one hand, a layer of inert substance can be deposited on the surface of the ternary material, and the direct contact between the cathode material and the electrolyte is isolated, so that the side reaction of the cathode material and the electrolyte is reduced, on the other hand, a layer of active substance can be deposited on the surface of the cathode material, and the conductivity of the material can be increased while the side reaction is reduced, so that the surface resistance of the material is reduced. The polypyrrole has the characteristics of high conductivity, easiness in preparation, chemical stability and the like, and is doped in the ternary material, so that the side reaction between the ternary material and an electrolyte can be inhibited by doping of the polypyrrole, the electronic conductivity of the material is improved, and the rate capability and the cycle performance of the ternary material are improved.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The preparation method of the modified ternary cathode material is characterized by comprising the following steps of:
(1) mixing a pyrrole monomer and a solvent to obtain a solution, mixing a ternary positive electrode material with the solution, and adding an ammonium persulfate solution to react to obtain a crude product;
(2) and carrying out heat treatment on the crude product to obtain the modified ternary cathode material.
2. The method of claim 1, wherein the solvent of step (1) comprises an ethanol-water solution;
preferably, in the ethanol-water solution, the mass fraction of ethanol is 20-30%;
preferably, the molar concentration of the pyrrole monomer in the solution is 0.1-0.3 mol/L.
3. The production method according to claim 1 or 2, wherein the mass ratio of the pyrrole monomer to the ternary positive electrode material is (0.01 to 0.03): 1.
4. The preparation method according to any one of claims 1 to 3, wherein the mass ratio of the pyrrole monomer and ammonium persulfate in the step (1) is (0.18-0.35): 1.
5. The production method according to any one of claims 1 to 4, wherein the stirring speed of the ammonium persulfate solution added is 300 to 800 rpm;
preferably, the atmosphere of the ammonium persulfate solution is nitrogen.
6. The process according to any one of claims 1 to 5, wherein the reaction in step (1) is carried out in an ice-water bath;
preferably, the reaction time is 8-12 h;
preferably, the reaction is followed by filtration.
7. The method according to any one of claims 1 to 6, wherein the temperature of the heat treatment in the step (2) is 150 to 250 ℃;
preferably, the time of the heat treatment is 2-4 h.
8. A modified ternary positive electrode material, characterized in that it is obtained by a process according to any one of claims 1 to 7.
9. A positive electrode sheet, characterized in that it comprises the modified ternary positive electrode material according to claim 8.
10. A lithium ion battery comprising the positive electrode sheet of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111062016.1A CN113793928A (en) | 2021-09-10 | 2021-09-10 | Modified ternary cathode material and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111062016.1A CN113793928A (en) | 2021-09-10 | 2021-09-10 | Modified ternary cathode material and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113793928A true CN113793928A (en) | 2021-12-14 |
Family
ID=79182998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111062016.1A Pending CN113793928A (en) | 2021-09-10 | 2021-09-10 | Modified ternary cathode material and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113793928A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335543A (en) * | 2021-12-31 | 2022-04-12 | 湖北亿纬动力有限公司 | Preparation method of organic matter supported lithium-rich manganese-based positive electrode material |
| CN114420909A (en) * | 2022-01-18 | 2022-04-29 | 湖北亿纬动力有限公司 | Composite cathode material and preparation method and application thereof |
| CN114447336A (en) * | 2022-01-27 | 2022-05-06 | 上海兰钧新能源科技有限公司 | Preparation method of high-nickel ternary positive electrode material, positive electrode material and battery |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010113153A (en) * | 2000-06-16 | 2001-12-28 | 김순택 | Method of preparing posiive active material for lithium secondary battery |
| CN104332619A (en) * | 2014-09-22 | 2015-02-04 | 上海中聚佳华电池科技有限公司 | Polypyrrole- coated full-gradient cathode material and preparation method thereof |
| CN105552326A (en) * | 2015-12-16 | 2016-05-04 | 天津先众科技有限公司 | Coating method for high-conductivity cathode material |
| CN109167036A (en) * | 2018-08-22 | 2019-01-08 | 广东工业大学 | A kind of TiN and the composite modified lithium ion laminated ternary positive material and preparation method thereof of conducting polymer |
| CN112164775A (en) * | 2020-09-08 | 2021-01-01 | 合肥国轩高科动力能源有限公司 | In-situ oxidative polymerization coated lithium ion ternary cathode material and preparation method thereof |
-
2021
- 2021-09-10 CN CN202111062016.1A patent/CN113793928A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010113153A (en) * | 2000-06-16 | 2001-12-28 | 김순택 | Method of preparing posiive active material for lithium secondary battery |
| CN104332619A (en) * | 2014-09-22 | 2015-02-04 | 上海中聚佳华电池科技有限公司 | Polypyrrole- coated full-gradient cathode material and preparation method thereof |
| CN105552326A (en) * | 2015-12-16 | 2016-05-04 | 天津先众科技有限公司 | Coating method for high-conductivity cathode material |
| CN109167036A (en) * | 2018-08-22 | 2019-01-08 | 广东工业大学 | A kind of TiN and the composite modified lithium ion laminated ternary positive material and preparation method thereof of conducting polymer |
| CN112164775A (en) * | 2020-09-08 | 2021-01-01 | 合肥国轩高科动力能源有限公司 | In-situ oxidative polymerization coated lithium ion ternary cathode material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 杨菲: ""富锂三元正极材料LiNi0.6Co0.2Mn0.2O2的制备工艺优化以及表面改性"", 《中国优秀硕士学位论文全文数据库（电子期刊）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335543A (en) * | 2021-12-31 | 2022-04-12 | 湖北亿纬动力有限公司 | Preparation method of organic matter supported lithium-rich manganese-based positive electrode material |
| CN114420909A (en) * | 2022-01-18 | 2022-04-29 | 湖北亿纬动力有限公司 | Composite cathode material and preparation method and application thereof |
| CN114447336A (en) * | 2022-01-27 | 2022-05-06 | 上海兰钧新能源科技有限公司 | Preparation method of high-nickel ternary positive electrode material, positive electrode material and battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113793928A (en) | Modified ternary cathode material and preparation method and application thereof | |
| CN110112388B (en) | Porous tungsten trioxide coated modified positive electrode material and preparation method thereof | |
| CN108899531B (en) | Preparation method of phosphate coated nickel-cobalt-aluminum ternary cathode material | |
| CN111916693B (en) | Method for preparing organic matter coated high-nickel cathode material | |
| CN112133897B (en) | Method for reducing surface alkali amount of positive electrode material and improving electrochemical performance through wet coating | |
| CN113937286B (en) | Coated modified sodium ion battery positive electrode material, preparation method thereof and battery | |
| CN114335534A (en) | Lithium cobaltate positive electrode material coated and modified by zirconium lithium phosphate fast ion conductor and preparation method and application thereof | |
| CN113772718A (en) | SnS-SnS2@ GO heterostructure composite material and preparation method and application thereof | |
| CN109818062B (en) | Ternary lithium ion battery and electrolyte thereof | |
| KR101904111B1 (en) | Negative Electrode for Non-aqueous Aluminum ion Battery and Method for Preparation of the Same | |
| CN115991505A (en) | Modified ternary positive electrode material and preparation method and application thereof | |
| CN111029535A (en) | Composite positive electrode material of lithium ion battery and preparation method thereof | |
| CN114014330A (en) | Energy storage electrode material K3Nb3Si2O13Preparation method and application of | |
| CN110137458B (en) | FTO (fluorine-doped tin oxide) coated modified cathode material and preparation method thereof | |
| CN111628165B (en) | Cathode material, preparation method thereof and lithium ion battery | |
| CN109616662A (en) | Nickel carries tungstic acid negative electrode material and preparation method thereof and lithium ion battery | |
| CN114583137B (en) | Method for modifying carbon surface by sulfur doped phosphorus and application thereof | |
| CN117577828B (en) | Long-cycle lithium battery positive electrode material and preparation method thereof | |
| CN111446416B (en) | Multi-level structure phase-combined TiO2Preparation and application of composite graphene negative electrode material | |
| CN114229889B (en) | Modified titanium-based negative electrode material and preparation method and application thereof | |
| CN110156078B (en) | Preparation method and application of potassium-vanadium-oxygen ternary compound | |
| CN114373904A (en) | P-doped porous carbon-hollow ZnO composite material and application thereof in lithium battery electrode | |
| CN113401949A (en) | Preparation method of praseodymium oxide particle modified lithium ion battery positive electrode material | |
| CN117410599A (en) | Method for promoting molybdenum disulfide phase transition and application thereof | |
| CN117673521A (en) | Preparation method and application of aqueous zinc ion battery electrolyte containing organic sulfide additive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211214 |
|
| RJ01 | Rejection of invention patent application after publication |