CN114005968A - Lithium ion battery containing graphene and magnesium oxide, positive electrode slurry and preparation method - Google Patents
Lithium ion battery containing graphene and magnesium oxide, positive electrode slurry and preparation method Download PDFInfo
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- CN114005968A CN114005968A CN202111154603.3A CN202111154603A CN114005968A CN 114005968 A CN114005968 A CN 114005968A CN 202111154603 A CN202111154603 A CN 202111154603A CN 114005968 A CN114005968 A CN 114005968A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 36
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 36
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000011267 electrode slurry Substances 0.000 title claims abstract description 33
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 33
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 48
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 33
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002033 PVDF binder Substances 0.000 claims abstract description 17
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 17
- 239000013543 active substance Substances 0.000 claims abstract description 10
- 239000000654 additive Substances 0.000 claims abstract description 6
- 239000006257 cathode slurry Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 89
- 239000003792 electrolyte Substances 0.000 claims description 33
- 239000002002 slurry Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000006256 anode slurry Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- -1 polyethylene Polymers 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000006229 carbon black Substances 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 239000007774 positive electrode material Substances 0.000 claims description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 6
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000011149 active material Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 238000005524 ceramic coating Methods 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 230000001351 cycling effect Effects 0.000 abstract description 2
- 239000010406 cathode material Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 230000001502 supplementing effect Effects 0.000 description 6
- 238000000746 purification Methods 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—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
-
- 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
- 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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery containing graphene and magnesium oxide, positive electrode slurry and a preparation method of the lithium ion battery. The positive electrode slurry comprises a component A and a solvent N-methyl pyrrolidone; the component A comprises the following components in percentage by mass: 90-92% of a main active substance, 2-3% of conductive carbon black, 0.5-1% of nano graphene, 0.5-1% of nano magnesium oxide and 2.5-5% of polyvinylidene fluoride; and a proper amount of solvent N-methyl pyrrolidone. The cathode slurry of the lithium ion battery adopts the superconducting material graphene and the nano magnesium oxide with stable high and low temperature performance and good thermal conductivity as additives, so that the surface resistance of a cathode plate can be greatly reduced, and the charge-discharge efficiency and the cycling stability of the battery are improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery containing graphene and magnesium oxide, positive electrode slurry and a preparation method.
Background
The lithium ion battery has the advantages of high energy density, good cycle performance, high battery voltage, wide working temperature range, long storage life, no memory effect, small self-discharge rate, quick charge and discharge, environmental protection and the like, is widely applied to electronic products such as mobile phones, notebook computers, digital cameras and the like, and is gradually widely used as a power battery on electric bicycles, models and electric automobiles.
In the lithium ion battery in the prior art, the anode mostly adopts anode active materials such as lithium iron phosphate, lithium cobaltate, multi-component materials and the like, and the original conductivity is poor; the conductive carbon black is used as a conductive material, so that the conductive capability of the pole piece is weak, the surface resistance is high, and when a large current passes through the pole piece, the heat is serious, the energy loss is large, the efficiency is low, and the cyclicity is poor.
Based on the above situation, it is urgently needed to develop a lithium ion battery containing graphene and magnesium oxide, a positive electrode slurry and a preparation method.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a lithium ion battery containing graphene and magnesium oxide, a positive electrode slurry, and a preparation method thereof. The positive electrode slurry of the lithium ion battery is prepared by physically mixing the nano-graphene and nano-magnesium oxide materials with the lithium iron phosphate material, the lithium cobaltate material and the multi-component material according to the formula proportion and the adding sequence, so that the improvement of the electrical conductivity is ensured, the high and low temperature stability is improved, and the cycle performance is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the lithium ion battery positive electrode slurry containing graphene and magnesium oxide comprises a component A and a solvent N-methyl pyrrolidone. The component A comprises the following components in percentage by mass: 90-92% of main active substance, 2-3% of conductive carbon black, 0.5-1% of nano graphene, 0.5-1% of nano magnesium oxide and 2.5-5% of polyvinylidene fluoride. And a proper amount of solvent N-methyl pyrrolidone.
Preferably, the main active material is one or a combination of lithium iron phosphate, lithium cobaltate and a multi-element positive material.
Preferably, the component A comprises the following components in percentage by mass: 92% of ternary positive electrode material, 2.5% of conductive carbon black, 0.5% of nano graphene, 0.5% of nano magnesium oxide and 4.5% of polyvinylidene fluoride.
Another object of the present invention is to disclose the preparation method of the above positive electrode slurry, comprising the steps of:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, and stirring for 30 minutes at a stirring linear speed of 5-8 m/s; the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, and stirring for 30 minutes at a stirring linear speed of 8-10 m/s;
(3) adding the main active substance, uniformly adding the main active substance for 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 8-10 m/s;
(4) adding nano magnesium oxide, and stirring for 60 minutes at a stirring linear speed of 10-12 m/s;
(5) adding nano graphene, stirring for 180 minutes at a stirring linear speed of 10-16 m/s;
(6) adjusting the viscosity of the slurry to 8000-12000 cps, and the solid content to 49-59%;
(7) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
Preferably, the adjustment of the viscosity of the slurry in the step (6) is performed by replenishing the solvent.
The invention further aims to disclose a lithium ion battery containing graphene and magnesium oxide, which comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate is prepared by uniformly coating the positive slurry prepared by the method on an aluminum foil.
Preferably, the negative plate is prepared by uniformly coating the negative slurry on a copper foil.
The cathode slurry comprises a component B and solvent water, wherein the component B comprises the following components in percentage by mass: 95% of graphite, 1% of conductive carbon black, 3.5% of water-based binder and 0.5% of sodium carboxymethyl cellulose; the conductive carbon black is dissolved in a solvent to form a conductive carbon black aqueous solution, and the solvent water accounts for at least 45% of the conductive carbon black aqueous solution by mass.
The negative electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in water, stirring for 60 minutes at a stirring linear speed of 6m/s, wherein the solvent water accounts for 45% of the mass percent of the conductive carbon black aqueous solution;
(2) adding sodium carboxymethylcellulose, stirring for 30 minutes at a stirring linear speed of 8 m/s;
(3) adding graphite, uniformly adding the graphite for 3 times, stirring for 30 minutes each time, and stirring at the linear speed of 8 m/s;
(4) adding the aqueous binder, and stirring for 30 minutes at a stirring linear speed of 12 m/s;
(5) adjusting the viscosity of the slurry to 4000cps and the solid content to 50%;
(6) and standing for 30 minutes in vacuum, and removing bubbles to obtain the cathode slurry.
Preferably, the diaphragm takes polyethylene or polypropylene as a base material, and is coated with a ceramic coating on two sides.
Preferably, the electrolyte comprises a solvent, an electrolyte and an additive, wherein the solvent comprises ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate in a mass ratio of 1:1: 1; the electrolyte is lithium hexafluorophosphate, and the molar concentration of the electrolyte is 1 mol/L.
Preferably, the electrolyte is prepared by the following method: and sequentially adding the solvent and the electrolyte into a reaction kettle, heating and stirring, and uniformly mixing to obtain the electrolyte. The moisture and purity of the solvent are in accordance with the use standard of the electrolyte, otherwise, the purification treatment should be performed in advance.
Compared with the prior art, the invention has the following beneficial effects:
the cathode slurry of the lithium ion battery adopts the superconducting material graphene and the nano magnesium oxide with stable high and low temperature performance and good thermal conductivity as additives, so that the surface resistance of a cathode plate can be greatly reduced, and the charge-discharge efficiency and the cycling stability of the battery are improved.
The lithium ion battery can be charged and discharged at high multiplying power, and the charging and discharging efficiency is improved. The lithium ion battery can be fully charged within 15 minutes, so that the charging efficiency is greatly improved, and the cycle performance under quick charging is improved.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The lithium ion battery positive electrode slurry containing graphene and magnesium oxide comprises a component A and a solvent N-methyl pyrrolidone.
The component A comprises the following components in percentage by mass: 90-92% of main active substance, 2-3% of conductive carbon black, 0.5-1% of nano graphene, 0.5-1% of nano magnesium oxide and 2.5-5% of polyvinylidene fluoride. And a proper amount of solvent N-methyl pyrrolidone.
The main active material can be one or a combination of lithium iron phosphate, lithium cobaltate and a multi-element anode material.
The preparation method of the positive electrode slurry comprises the following steps:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, and stirring for 30 minutes at a stirring linear speed of 5-8 m/s; the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, and stirring for 30 minutes at a stirring linear speed of 8-10 m/s;
(3) adding the main active substance, uniformly adding the main active substance for 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 8-10 m/s;
(4) adding nano magnesium oxide, and stirring for 60 minutes at a stirring linear speed of 10-12 m/s;
(5) adding nano graphene, stirring for 180 minutes at a stirring linear speed of 10-16 m/s;
(6) adjusting the viscosity of the slurry to 8000-12000 cps, and the solid content to 49-59%;
(7) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
And (4) adjusting the viscosity of the slurry in the step (6) by supplementing the solvent.
And uniformly coating the prepared anode slurry on an aluminum foil to prepare an anode plate.
Example 2
A high-safety lithium ion battery comprises a positive plate, a negative plate, a diaphragm and electrolyte.
Manufacturing a positive plate:
the positive electrode slurry comprises a component A and a solvent N-methyl pyrrolidone.
The component A comprises the following components in parts by weight: 92 parts of ternary positive electrode material, 2.5 parts of conductive carbon black, 0.5 part of nano graphene, 0.5 part of nano magnesium oxide and 4.5 parts of polyvinylidene fluoride.
The positive electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, stirring for 30 minutes at a stirring linear speed of 6m/s, wherein the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, stirring for 30 minutes at the stirring linear speed of 8 m/s;
(3) adding the ternary cathode material, uniformly adding the ternary cathode material by 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 10 m/s;
(4) adding nano magnesium oxide, stirring for 60 minutes at a stirring linear speed of 10 m/s;
(5) adding nano graphene, stirring for 180 minutes at a stirring linear speed of 16 m/s;
(6) supplementing solvent according to actual conditions to adjust the viscosity of the slurry to 9500cps and the solid content to 52%;
(7) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
And uniformly coating the prepared anode slurry on an aluminum foil to prepare an anode plate.
And (3) manufacturing a negative plate:
the negative electrode slurry comprises a component B and solvent water. The component B comprises the following components in percentage by mass: 95% of graphite, 1% of conductive carbon black, 3.5% of water-based binder and 0.5% of sodium carboxymethyl cellulose.
The negative electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in water, stirring for 60 minutes at a stirring linear speed of 6m/s, wherein the solvent water accounts for 45% of the mass percent of the conductive carbon black aqueous solution;
(2) adding sodium carboxymethylcellulose, stirring for 30 minutes at a stirring linear speed of 8 m/s;
(3) adding graphite, uniformly adding the graphite for 3 times, stirring for 30 minutes each time, and stirring at the linear speed of 8 m/s;
(4) adding the aqueous binder, and stirring for 30 minutes at a stirring linear speed of 12 m/s;
(5) supplementing solvent according to actual conditions to adjust the viscosity of the slurry to 4000cps and the solid content to 50%;
(6) and standing for 30 minutes in vacuum, and removing bubbles to obtain the cathode slurry.
And uniformly coating the prepared negative electrode slurry on copper foil to prepare a negative electrode sheet.
A diaphragm:
the diaphragm material is polypropylene material, and a double-sided ceramic diaphragm is used.
Preparing electrolyte:
the electrolyte includes a solvent, an electrolyte, and an additive. The solvent comprises ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate in a mass ratio of 1:1: 1. The electrolyte is lithium hexafluorophosphate, and the molar concentration of the electrolyte is 1 mol/L.
The electrolyte is prepared by the following method: and sequentially adding the solvent and the electrolyte into a reaction kettle, heating and stirring, and uniformly mixing to obtain the electrolyte. The moisture and purity of the solvent are in accordance with the use standard of the electrolyte, otherwise, the purification treatment should be performed in advance.
Comparative example 1 (without nano-graphene and nano-magnesia)
A battery includes a positive plate, a negative plate, a separator, and an electrolyte.
Manufacturing a positive plate:
the positive electrode slurry comprises a component C and a solvent N-methyl pyrrolidone.
The component C comprises the following components in parts by weight: 92 parts of ternary cathode material, 2.5 parts of conductive carbon black and 4.5 parts of polyvinylidene fluoride.
The positive electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, stirring for 30 minutes at a stirring linear speed of 6m/s, wherein the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, stirring for 30 minutes at the stirring linear speed of 8 m/s;
(3) adding the ternary cathode material, uniformly adding the ternary cathode material by 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 10 m/s;
(4) supplementing solvent according to actual conditions to adjust the viscosity of the slurry to 9500cps and the solid content to 52%;
(5) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
And uniformly coating the prepared anode slurry on an aluminum foil to prepare an anode plate.
The remaining negative electrode sheet, separator and electrolyte were the same as in example 2.
Comparative example 2 (without nano-magnesia)
A battery includes a positive plate, a negative plate, a separator, and an electrolyte.
Manufacturing a positive plate:
the positive electrode slurry comprises a component D and a solvent N-methyl pyrrolidone.
The component D comprises the following components in parts by weight: 92 parts of ternary positive electrode material, 2.5 parts of conductive carbon black, 0.5 part of nano graphene and 4.5 parts of polyvinylidene fluoride.
The positive electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, stirring for 30 minutes at a stirring linear speed of 6m/s, wherein the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, stirring for 30 minutes at the stirring linear speed of 8 m/s;
(3) adding the ternary cathode material, uniformly adding the ternary cathode material by 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 10 m/s;
(4) adding nano graphene, stirring for 180 minutes at a stirring linear speed of 16 m/s;
(5) supplementing solvent according to actual conditions to adjust the viscosity of the slurry to 9500cps and the solid content to 52%;
(6) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
And uniformly coating the prepared anode slurry on an aluminum foil to prepare an anode plate.
The remaining negative electrode sheet, separator and electrolyte were the same as in example 2.
Comparative example 3 (without nano-graphene)
A battery includes a positive plate, a negative plate, a separator, and an electrolyte.
Manufacturing a positive plate:
the positive electrode slurry comprises a component E and a solvent N-methyl pyrrolidone.
The component E comprises the following components in parts by weight: 92 parts of ternary positive electrode material, 2.5 parts of conductive carbon black, 0.5 part of nano magnesium oxide and 4.5 parts of polyvinylidene fluoride.
The positive electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, stirring for 30 minutes at a stirring linear speed of 6m/s, wherein the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, stirring for 30 minutes at the stirring linear speed of 8 m/s;
(3) adding the ternary cathode material, uniformly adding the ternary cathode material by 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 10 m/s;
(4) adding nano magnesium oxide, stirring for 60 minutes at a stirring linear speed of 10 m/s;
(5) supplementing solvent according to actual conditions to adjust the viscosity of the slurry to 9500cps and the solid content to 52%;
(6) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
And uniformly coating the prepared anode slurry on an aluminum foil to prepare an anode plate.
The remaining negative electrode sheet, separator and electrolyte were the same as in example 2.
5 ampere-hour battery cores are manufactured according to the example 2 and the comparative examples 1 to 3, and alternating current internal resistance, quick charging efficiency and cycle test are carried out, and the results are as follows:
| test items | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| AC impedance | 2.5mΩ | 5.8mΩ | 3.5mΩ | 4.6mΩ |
| 2c fast charge efficiency | 98％ | 86％ | 94％ | 90％ |
| Capacity retention after 400 cycles | 95％ | 83％ | 90％ | 92％ |
As can be seen from the above table: the battery positive electrode slurry in the embodiment 2 adopts the superconducting material graphene and the nano magnesium oxide which has stable high and low temperature performance and good thermal conductivity as the additive, so that the surface resistance of the positive electrode plate can be greatly reduced, and the charge-discharge efficiency and the cycle stability of the battery are improved.
The lithium ion battery of embodiment 2 can charge and discharge at a high rate, improves charge and discharge efficiency, and simultaneously, the cycle performance under quick charge is also improved.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (10)
1. The lithium ion battery positive electrode slurry containing graphene and magnesium oxide is characterized by comprising a component A and a solvent N-methyl pyrrolidone; the component A comprises the following components in percentage by mass: 90-92% of a main active substance, 2-3% of conductive carbon black, 0.5-1% of nano graphene, 0.5-1% of nano magnesium oxide and 2.5-5% of polyvinylidene fluoride; and a proper amount of solvent N-methyl pyrrolidone.
2. The graphene and magnesium oxide-containing lithium ion battery positive electrode slurry according to claim 1, wherein the main active material is one or a combination of lithium iron phosphate, lithium cobaltate and a multi-element positive electrode material.
3. The graphene and magnesium oxide-containing lithium ion battery positive electrode slurry according to claim 1, wherein the component A comprises the following components in percentage by mass: 92% of ternary positive electrode material, 2.5% of conductive carbon black, 0.5% of nano graphene, 0.5% of nano magnesium oxide and 4.5% of polyvinylidene fluoride.
4. The method for producing the positive electrode slurry according to any one of claims 1 to 3, comprising the steps of:
(1) dissolving conductive carbon black in an N-methyl pyrrolidone solvent, and stirring for 30 minutes at a stirring linear speed of 5-8 m/s; the mass ratio of the carbon black to the N-methyl pyrrolidone is 1: 10;
(2) adding polyvinylidene fluoride, and stirring for 30 minutes at a stirring linear speed of 8-10 m/s;
(3) adding the main active substance, uniformly adding the main active substance for 3 times, stirring for 10 minutes each time, and stirring at the linear speed of 8-10 m/s;
(4) adding nano magnesium oxide, and stirring for 60 minutes at a stirring linear speed of 10-12 m/s;
(5) adding nano graphene, stirring for 180 minutes at a stirring linear speed of 10-16 m/s;
(6) adjusting the viscosity of the slurry to 8000-12000 cps, and the solid content to 49-59%;
(7) standing for 60 minutes in vacuum, and removing bubbles to obtain the anode slurry.
5. The method for producing positive electrode slurry according to claim 4, wherein the adjustment of the slurry viscosity in the step (6) is performed by replenishing the solvent.
6. A lithium ion battery containing graphene and magnesium oxide comprises a positive plate, a negative plate, a diaphragm and electrolyte, and is characterized in that the positive plate is prepared by uniformly coating the positive slurry prepared by the method of claim 4 or 5 on an aluminum foil.
7. The lithium ion battery containing graphene and magnesium oxide according to claim 6, wherein the negative electrode sheet is prepared by uniformly coating a negative electrode slurry on a copper foil;
the negative electrode slurry comprises a component B and solvent water, wherein the component B comprises the following components in percentage by mass: 95% of graphite, 1% of conductive carbon black, 3.5% of water-based binder and 0.5% of sodium carboxymethyl cellulose; the conductive carbon black is dissolved in a solvent to form a conductive carbon black aqueous solution, and the solvent water accounts for at least 45% of the conductive carbon black aqueous solution by mass.
The negative electrode slurry is prepared by the following steps:
(1) dissolving conductive carbon black in water, stirring for 60 minutes at a stirring linear speed of 6m/s, wherein the solvent water accounts for 45% of the mass percent of the conductive carbon black aqueous solution;
(2) adding sodium carboxymethylcellulose, stirring for 30 minutes at a stirring linear speed of 8 m/s;
(3) adding graphite, uniformly adding the graphite for 3 times, stirring for 30 minutes each time, and stirring at the linear speed of 8 m/s;
(4) adding the aqueous binder, and stirring for 30 minutes at a stirring linear speed of 12 m/s;
(5) adjusting the viscosity of the slurry to 4000cps and the solid content to 50%;
(6) and standing for 30 minutes in vacuum, and removing bubbles to obtain the cathode slurry.
8. The lithium ion battery containing graphene and magnesium oxide according to claim 6, wherein the separator is made of polyethylene or polypropylene and coated with ceramic coatings on both sides.
9. The lithium ion battery containing graphene and magnesium oxide according to claim 6, wherein the electrolyte comprises a solvent, an electrolyte and an additive, wherein the solvent comprises ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate in a mass ratio of 1:1: 1; the electrolyte is lithium hexafluorophosphate, and the molar concentration of the electrolyte is 1 mol/L.
10. The lithium ion battery containing graphene and magnesium oxide according to claim 9, wherein the electrolyte is prepared by the following method: and sequentially adding the solvent and the electrolyte into a reaction kettle, heating and stirring, and uniformly mixing to obtain the electrolyte.
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