CN114188541A - Positive electrode plate of lithium ion battery and preparation method thereof - Google Patents
Positive electrode plate of lithium ion battery and preparation method thereof Download PDFInfo
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- CN114188541A CN114188541A CN202111502388.1A CN202111502388A CN114188541A CN 114188541 A CN114188541 A CN 114188541A CN 202111502388 A CN202111502388 A CN 202111502388A CN 114188541 A CN114188541 A CN 114188541A
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- electrode plate
- lithium ion
- positive electrode
- ion battery
- lithium
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000011268 mixed slurry Substances 0.000 claims abstract description 23
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000006258 conductive agent Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 12
- -1 polytetrafluoroethylene Polymers 0.000 claims description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 11
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 239000011888 foil Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 239000002033 PVDF binder Substances 0.000 claims description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 8
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 7
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 7
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 7
- 239000001099 ammonium carbonate Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000007774 positive electrode material Substances 0.000 claims description 6
- 239000006230 acetylene black Substances 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052744 lithium Inorganic materials 0.000 abstract description 12
- 238000001291 vacuum drying Methods 0.000 abstract description 9
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 238000013508 migration Methods 0.000 abstract description 4
- 230000005012 migration Effects 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 10
- 229920000715 Mucilage Polymers 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000007761 roller coating Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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 technical field of lithium ion batteries, in particular to a positive electrode plate of a lithium ion battery and a preparation method thereof. The preparation method of the positive electrode plate of the lithium ion battery comprises the following steps: (1) mixing lithium iron phosphate with a binder, a conductive agent, a pore-forming agent and N-methyl pyrrolidone to obtain mixed slurry; (2) coating the mixed slurry on one side of a current collector to form an electrode plate; (3) and (4) drying the obtained electrode plate after microwave heating to obtain the lithium ion battery anode electrode plate. According to the invention, the pore-forming agent is additionally added, and after microwave and vacuum drying, the solvent N-methyl pyrrolidone and the pore-forming agent are volatilized to obtain the porous electrode plate, so that the wettability of the electrolyte is improved, a rapid channel is provided for the migration of lithium ions, and the electrochemical performance of the lithium battery under the low-temperature condition is further improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode plate of a lithium ion battery and a preparation method thereof.
Background
The lithium ion battery gradually replaces lead-acid batteries, cadmium-nickel batteries and hydrogen-nickel batteries with the excellent characteristics of high specific power, large energy density, long service life, low self-discharge rate, long storage time, no pollution, quick charge and the like, and becomes the main power battery of the electric vehicle. The actual running conditions of the electric vehicle are complex, the temperature range is wide, the charging and discharging performance of the lithium ion battery is directly related to the ambient temperature, particularly, the charging and discharging performance of the battery is greatly influenced by low temperature, and the low temperature performance of the battery, which is used as an important component of the battery, of the positive and negative pole pieces and the positive and negative pole materials directly influences the low temperature performance of the battery.
However, lithium batteries have Li in the electrode at low temperatures+The diffusion is limited seriously, which is particularly obvious under high compaction density, the electrolyte is difficult to infiltrate, and the lithium ion diffusion is more difficult, so that the performance of the battery is obviously reduced. The porosity of the pole piece is a very important parameter of the pole piece, and determines the migration rate of lithium ions in the electrode, and therefore the dynamic performance of the battery cell at low temperature.
Therefore, how to improve the performance of the lithium ion battery under the low temperature condition by regulating and controlling the porosity of the electrode sheet is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a positive electrode plate of a lithium ion battery and a preparation method thereof, and aims to solve the technical problems.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a positive electrode plate of a lithium ion battery, which comprises the following steps:
(1) mixing lithium iron phosphate with a binder, a conductive agent, a pore-forming agent and N-methyl pyrrolidone to obtain mixed slurry;
(2) coating the mixed slurry on one side of a current collector to form an electrode plate;
(3) and (4) heating the obtained electrode plate by microwave, slicing and drying to obtain the lithium ion battery anode electrode plate.
Preferably, the mass ratio of the lithium iron phosphate to the binder, the conductive agent and the pore-forming agent is 90-100: 2-8: 2-9: 0.5-1.5.
Preferably, the pore-forming agent is citric acid or ammonium bicarbonate.
Preferably, the solid content in the mixed slurry is 40-70%.
Preferably, the binder is polytetrafluoroethylene and/or polyvinylidene fluoride.
Preferably, the conductive agent is one of acetylene black, carbon black and conductive graphite.
Preferably, the current collector is an aluminum foil.
Preferably, the microwave heating power is 200-300W, and the time is 5-10 min; the drying is carried out under a vacuum condition, the drying temperature is 100-150 ℃, and the drying time is 5-10 hours.
The invention also provides the positive electrode plate of the lithium ion battery prepared by the method.
Preferably, the positive electrode plate of the lithium ion battery comprises a current collector and a positive electrode material coated on the current collector, wherein the coating density of the positive electrode material on the current collector is 70-80 mg/cm2。
Compared with the prior art, the technical scheme of the invention has the following technical effects:
in the preparation process of the lithium battery positive plate, a pore-forming agent is additionally added, and after microwave and vacuum drying, a solvent N-methyl pyrrolidone and the pore-forming agent are volatilized to obtain the porous electrode plate, so that the wettability of electrolyte is improved, a quick channel is provided for migration of lithium ions, and the chemical performance of the lithium battery under a low-temperature condition is improved. Compared with a lithium battery prepared from the lithium battery positive plate without the pore-forming agent, the low-temperature discharge efficiency is improved by 60% at the temperature of-10 ℃.
Detailed Description
The invention provides a preparation method of a positive electrode plate of a lithium ion battery, which comprises the following steps:
(1) mixing lithium iron phosphate with a binder, a conductive agent, a pore-forming agent and N-methyl pyrrolidone to obtain mixed slurry;
(2) coating the mixed slurry on one side of a current collector to form an electrode plate;
(3) and (4) heating the obtained electrode plate by microwave, slicing and drying to obtain the lithium ion battery anode electrode plate.
In the invention, when the raw materials are mixed, the N-methyl pyrrolidone and the binder are mixed in a mixer to prepare the mucilage, and then the lithium iron phosphate, the conductive agent and the pore-forming agent are added.
In the present invention, the coating of the mixed slurry is spray coating or roll coating conventionally used in the art.
In the invention, the mass ratio of the lithium iron phosphate to the binder, the conductive agent and the pore-forming agent is preferably 90-100: 2-8: 2-9: 0.5-1.5, and more preferably 93-97: 3-6: 4-7: 0.6-1.
In the present invention, the pore-forming agent is preferably citric acid or ammonium hydrogen carbonate, and more preferably citric acid.
In the invention, the solid content in the mixed slurry is preferably 40-70%, and more preferably 50-60%.
In the present invention, the binder is polytetrafluoroethylene and/or polyvinylidene fluoride, and is more preferably polyvinylidene fluoride.
In the present invention, the conductive agent is preferably one of acetylene black, carbon black, and conductive graphite, and more preferably conductive graphite.
In the present invention, the current collector is preferably an aluminum foil.
In the invention, the power of the microwave heating is preferably 200-300W, more preferably 220-260W, and the time is preferably 5-10 min, more preferably 6-8 min; the drying is carried out under a vacuum condition, the drying temperature is preferably 100-150 ℃, more preferably 100-120 ℃, and the time is preferably 5-10 h, more preferably 7-9 h.
The invention also provides the positive electrode plate of the lithium ion battery prepared by the method.
In the invention, the positive electrode plate of the lithium ion battery comprises a current collector and a positive electrode material coated on the current collector, wherein the coating density of the positive electrode material on the current collector is preferably 70-80 mg/cm2More preferably 73 to 76mg/cm2。
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
(1) Mixing N-methyl pyrrolidone and polytetrafluoroethylene in a mixer to prepare a mucilage, and adding lithium iron phosphate, conductive graphite and citric acid, wherein the N-methyl pyrrolidone is added according to the ratio of 51% of solid content in the mixed slurry, and the lithium iron phosphate, the polytetrafluoroethylene, the conductive graphite and the citric acid are added according to the mass ratio of 90:2:2: 1.5;
(2) coating the mixed slurry on one side of an aluminum foil through roller coating to form an electrode plate;
(3) heating the obtained electrode slice with 200W power under microwave for 6min, taking out, slicing, and vacuum drying at 105 deg.C under-0.08 MPa for 9 hr to obtain sheet with surface density of 73mg/cm2The positive electrode sheet of (1).
Example 2
(1) Mixing N-methyl pyrrolidone and polyvinylidene fluoride in a mixer to prepare mucilage, and then adding lithium iron phosphate, acetylene black and ammonium bicarbonate, wherein the N-methyl pyrrolidone is added according to the ratio that the solid content in the mixed slurry is 50%, and the lithium iron phosphate, the polyvinylidene fluoride, the acetylene black and the ammonium bicarbonate are added according to the mass ratio of 93:5:4: 0.7;
(2) coating the mixed slurry on one side of an aluminum foil through roller coating to form an electrode plate;
(3) heating the obtained electrode slice with 220W microwave for 7min, taking out, slicing, vacuum drying at 100 deg.C under-0.08 MPa for 9h to obtain positive electrode slice with surface density of 77mg/cm2。
Example 3
(1) Mixing N-methyl pyrrolidone and polyvinylidene fluoride in a mixer to prepare a mucilage, and then adding lithium iron phosphate, carbon black and citric acid, wherein the N-methyl pyrrolidone is added according to the ratio of 55% of solid content in the mixed slurry, and the lithium iron phosphate, the polyvinylidene fluoride, the carbon black and the citric acid are added according to the mass ratio of 97:7:6: 0.8;
(2) coating the mixed slurry on one side of an aluminum foil through roller coating to form an electrode plate;
(3) heating the obtained electrode slice with 280W power microwave for 5min, taking out, slicing, and vacuum drying at 110 deg.C under vacuum degree of-0.08 MPa for 8 hr to obtain sheet with surface density of 70mg/cm2The positive electrode sheet of (1).
Example 4
(1) Mixing N-methyl pyrrolidone and polytetrafluoroethylene in a mixer to prepare a mucilage, and then adding lithium iron phosphate, conductive graphite and ammonium bicarbonate, wherein the N-methyl pyrrolidone is added according to the ratio of 70% of solid content in the mixed slurry, and the lithium iron phosphate, the polytetrafluoroethylene, the conductive graphite and the ammonium bicarbonate are added according to the mass ratio of 100:8:9: 0.5;
(2) coating the mixed slurry on one side of an aluminum foil through roller coating to form an electrode plate;
(3) heating the obtained electrode slice with microwave under 300W power for 9min, taking out, slicing, and vacuum drying at 110 deg.C under vacuum degree of-0.08 MPa for 8.5h to obtain sheet with surface density of 80mg/cm2The positive electrode sheet of (1).
Example 5
(1) Mixing N-methyl pyrrolidone and polytetrafluoroethylene in a mixer to prepare a mucilage, and adding lithium iron phosphate, conductive graphite and citric acid, wherein the N-methyl pyrrolidone is added according to the solid content of 60% in the mixed slurry, and the lithium iron phosphate, the polytetrafluoroethylene, the conductive graphite and the citric acid are added according to the mass ratio of 99:5:8: 1.2;
(2) spraying the mixed slurry on one side of an aluminum foil to form an electrode plate;
(3) heating the obtained electrode slice with 250W power for 10min, taking out, slicing, and vacuum drying at 120 deg.C under-0.08 MPa for 7.5 hr to obtain sheet with surface density of 77mg/cm2The positive electrode sheet of (1).
Comparative example 1
(1) Mixing N-methyl pyrrolidone and polytetrafluoroethylene in a mixer to prepare a rubber cement, and adding lithium iron phosphate and conductive graphite, wherein the N-methyl pyrrolidone is added according to the ratio of 51% of solid content in the mixed cement, and the lithium iron phosphate, the polytetrafluoroethylene and the conductive graphite are added according to the mass ratio of 90:2: 2;
(2) coating the mixed slurry on one side of an aluminum foil through roller coating to form an electrode plate;
(3) heating the obtained electrode slice with 200W power under microwave for 6min, taking out, slicing, and vacuum drying at 100 deg.C under vacuum degree of-0.08 MPa for 10 hr to obtain sheet with surface density of 73mg/cm2The positive electrode sheet of (1).
The porosity of the positive electrode plate of the lithium ion battery prepared in the examples 1 to 5 and the porosity of the positive electrode plate of the lithium ion battery prepared in the comparative example 1 are compared, and the specific comparison result is shown in table 1:
table 1 results of comparing the porosities of the positive electrode tabs of the lithium ion batteries prepared in examples 1 to 5 and comparative example 1:
as can be seen from table 1, the porosity and the liquid absorption of the positive electrode plate of the lithium ion battery prepared by the invention are higher than those of the comparative example without the pore-forming agent, and the positive electrode plate of the lithium ion battery prepared by the embodiment of the invention has higher porosity; the positive electrode plate of the lithium ion battery prepared in the comparative example 1 and the positive electrode plate of the lithium ion battery prepared in the example 1 are only different in that no pore-forming agent is added, and the porosity is low by 10%.
Test example 1 test of chemical properties of positive electrode sheets of lithium ion batteries prepared in examples 1 to 5 and comparative example 1
The lithium ion battery positive electrode tabs prepared in examples 1 to 5 and comparative example 1 were cut into 14mm electrode tabs, and the lithium ion battery positive electrode tabs prepared in examples 1 to 5 and comparative example 1 were respectively sleeved with a lithium sheet, a separator (degard 2400) and a lithium ion button battery case of model CR2025 in a glove box Universal (2440/750) having an oxygen content of less than 0.1 μ L/L. The electrolyte consists of 1mol/L LiPF6And DC/EC (volume ratio 1: 1), mounted and packaged for testing.
The following low temperature electrochemical performance tests were performed with the novyi 3008 cell test system. Firstly, the battery is charged and discharged for the second time at the normal temperature of 25 ℃ at 0.1C, and the charge and discharge cut-off voltage is 2.4-4.2V. Then charging to 4.2V at 0.1C; recording the charging capacity, under the temperature condition of-10 ℃, after the battery is firstly placed for 12h, discharging to 2.4V at a constant current of 0.1C, and recording the ratio of the discharging capacity of 0.1C under-10 ℃ to the charging capacity of 0.1C at normal temperature, namely the discharging efficiency under low temperature. The test results are shown in table 2:
table 2 low-temperature discharge efficiency of lithium batteries manufactured using positive electrode sheets of lithium ion batteries manufactured in examples 1 to 5 and comparative example 1
As can be seen from table 2, the lithium batteries manufactured by using the positive electrode tabs of the lithium batteries manufactured in examples 1 to 5 also have excellent low-temperature discharge efficiency under low-temperature conditions, and the low-temperature discharge efficiency of example 1 is improved by 60% compared with that of comparative example 1. In embodiments 1 to 5, in the preparation process of the lithium battery positive electrode plate, a pore-forming agent is additionally added, and after microwave and vacuum drying, the solvent N-methylpyrrolidone and the pore-forming agent are volatilized to obtain a porous electrode plate, so that the wettability of the electrolyte is improved, a rapid channel is provided for migration of lithium ions, and further, the chemical performance of the lithium battery under a low-temperature condition is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A preparation method of a positive electrode plate of a lithium ion battery is characterized by comprising the following steps:
(1) mixing lithium iron phosphate with a binder, a conductive agent, a pore-forming agent and N-methyl pyrrolidone to obtain mixed slurry;
(2) coating the mixed slurry on one side of a current collector to form an electrode plate;
(3) and (4) heating the obtained electrode plate by microwave, slicing and drying to obtain the lithium ion battery anode electrode plate.
2. The preparation method of the positive electrode plate of the lithium ion battery as claimed in claim 1, wherein the mass ratio of the lithium iron phosphate to the binder, the conductive agent and the pore-forming agent is 90-100: 2-8: 2-9: 0.5-1.5.
3. The method for preparing the positive electrode plate of the lithium ion battery according to claim 1 or 2, wherein the pore-forming agent is citric acid or ammonium bicarbonate.
4. The preparation method of the positive electrode plate of the lithium ion battery according to claim 1 or 2, wherein the solid content in the mixed slurry is 40-70%.
5. The method for preparing the positive electrode plate of the lithium ion battery according to claim 4, wherein the binder is polytetrafluoroethylene and/or polyvinylidene fluoride.
6. The method for preparing the positive electrode plate of the lithium ion battery according to claim 5, wherein the conductive agent is one of acetylene black, carbon black and conductive graphite.
7. The method for preparing the positive electrode plate of the lithium ion battery according to claim 1, wherein the current collector is an aluminum foil.
8. The preparation method of the positive electrode plate of the lithium ion battery according to claim 1, wherein the microwave heating power is 200-300W and the time is 5-10 min; the drying is carried out under a vacuum condition, the drying temperature is 100-150 ℃, and the drying time is 5-10 hours.
9. The positive electrode plate of the lithium ion battery prepared by the method of any one of claims 1 to 8, which comprises a current collector and a positive electrode material coated on the current collector, wherein the coating density of the positive electrode material on the current collector is 70-80 mg/cm2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116646470A (en) * | 2023-07-18 | 2023-08-25 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, preparation method of positive electrode plate, battery and electric equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633350A (en) * | 2016-04-01 | 2016-06-01 | 深圳市沃特玛电池有限公司 | Porous pole piece and preparation method thereof and lithium ion battery |
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- 2021-12-09 CN CN202111502388.1A patent/CN114188541A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633350A (en) * | 2016-04-01 | 2016-06-01 | 深圳市沃特玛电池有限公司 | Porous pole piece and preparation method thereof and lithium ion battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116646470A (en) * | 2023-07-18 | 2023-08-25 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, preparation method of positive electrode plate, battery and electric equipment |
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Application publication date: 20220315 |