CN110707318A - Preparation method of lithium titanate battery negative electrode slurry - Google Patents
Preparation method of lithium titanate battery negative electrode slurry Download PDFInfo
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- CN110707318A CN110707318A CN201910719572.8A CN201910719572A CN110707318A CN 110707318 A CN110707318 A CN 110707318A CN 201910719572 A CN201910719572 A CN 201910719572A CN 110707318 A CN110707318 A CN 110707318A
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- lithium titanate
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 53
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000011267 electrode slurry Substances 0.000 title claims description 18
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 238000000498 ball milling Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 239000002904 solvent Substances 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 239000006257 cathode slurry Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000006258 conductive agent Substances 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 16
- 229910021389 graphene Inorganic materials 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000011812 mixed powder Substances 0.000 claims description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 7
- 238000007873 sieving Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- 239000002134 carbon nanofiber Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 5
- 238000004537 pulping Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 238000007580 dry-mixing Methods 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 206010016766 flatulence Diseases 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 229940057838 polyethylene glycol 4000 Drugs 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009736 wetting Methods 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
-
- 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
- H01M4/04—Processes of manufacture in general
-
- 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
- H01M4/621—Binders
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the steps of dry mixing lithium titanate and other components, fully and uniformly mixing the lithium titanate, a binder, a dispersing agent and a conductive agent, ensuring that the surface wettability of materials is good, preventing the agglomeration phenomenon easily caused by directly adding a solvent, adding the solvent, and firstly using ultrasonic premixing, so that the generation of bubbles can be prevented, the materials can be fully infiltrated, then continuously adopting ball milling to fully and uniformly disperse the materials, preventing large particles from occurring, and improving the stability of the slurry and the adhesive force of the slurry on a current collector. Moreover, the method can shorten the pulping time to about 3 hours and obviously improve the production efficiency.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of lithium titanate battery cathode slurry.
[ background of the invention ]
The lithium titanate material is generally used as a negative electrode material in a battery, because the potential of lithium titanate is higher than that of pure metal lithium, lithium crystal branches are not easy to generate, the discharge voltage is stable, and lithium titanate has a higher lithium ion diffusion coefficient, so that the lithium ion intercalation and deintercalation can not cause the change of the crystal form structure of the lithium titanate during charging and discharging; therefore, compared with a carbon negative electrode material, the lithium titanate material has higher safety and stability, good quick charge performance and longer cycle life.
However, the lithium titanate has smaller particle size and large specific surface area, and the conventional wet mixing process has poor dispersibility and is difficult to stir uniformly during pulping, so that the uniformity of the slurry is influenced. The uneven slurry will also affect the coating effect, resulting in the electrode sheet performance being greatly affected. In view of this, patent 201711188923.4 discloses a lithium ion battery slurry and a method for preparing the same, in which a high-speed disperser is used to disperse a mixed slurry, and the dispersibility of a negative electrode slurry can be improved to some extent, but the slurry has problems of fine particles and incomplete wetting of the inside of the particles. Patent 201811266038.8 also discloses a method for preparing a lithium ion battery slurry, which divides the mixing process into a plurality of processes such as low-speed high-viscosity stirring, medium-speed medium-viscosity stirring, high-speed low-viscosity stirring, viscosity adjustment and slurry discharge, and has the advantages of more required processes, longer mixing time, more influencing factors and difficult control. Therefore, it is necessary to develop a new method for preparing lithium titanate battery negative electrode slurry.
[ summary of the invention ]
The invention aims to solve the defects of the prior art and provide a preparation method of lithium titanate battery cathode slurry.
The purpose of the invention is realized by the following technical scheme:
a preparation method of lithium titanate battery negative electrode slurry comprises the following steps:
(1) firstly, uniformly mixing lithium titanate active powder, a conductive agent, a binder and a dispersing agent;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with a solvent to obtain premixed slurry;
(3) and (3) ball-milling the premixed slurry obtained in the step (2) through a sieve with more than 200 meshes to obtain the cathode slurry. Preferably, the conductive agent in the step (1) is one or a combination of more than two of carbon black, conductive graphite, graphene, carbon nanofiber and carbon nanotube; the solvent in the step (2) is N-methyl pyrrolidone, water or ethanol; the binder is polytetrafluoroethylene or/and polyvinylidene fluoride; the dispersant is one or a combination of more than two of polyethylene glycol and cellulose.
Preferably, the mass ratio of the lithium titanate active powder to the conductive agent to the solvent to the binder to the dispersant is 100: 2-6: 45-85: 1-2: 2-5.
Preferably, the lithium titanate active powder is carbon-coated or graphene-coated lithium titanate active powder.
Preferably, the ultrasonic frequency of the step (2) is 20-40KHz, and the time is 15-30 min.
Preferably, the ball milling in the step (3) adopts zirconia ball milling, the ball milling speed is 300-800r/min, and the time is 90-150 min.
According to the invention, the lithium titanate and other components are dry-mixed, so that the lithium titanate, the binder, the dispersant and the conductive agent can be fully and uniformly mixed, the surface wettability of the material is good, the agglomeration phenomenon easily caused by directly adding the solvent can be prevented, the solvent is added, ultrasonic premixing is firstly used, the generation of bubbles can be prevented, the material can be fully infiltrated, then the ball milling is continuously adopted, the material is fully and uniformly dispersed, the large particles are prevented, and the stability of the slurry and the adhesive force of the slurry on a current collector are improved. Moreover, the method can shorten the pulping time to about 3 hours and obviously improve the production efficiency.
[ detailed description ] embodiments
The present invention will be further described with reference to the following embodiments.
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the following steps:
(1) firstly, uniformly mixing lithium titanate active powder, a conductive agent, a binder and a dispersing agent; the lithium titanate active powder can adopt pure lithium titanate, carbon-coated or graphene-coated lithium titanate powder or doped lithium titanate powder, and preferably adopts graphene-coated lithium titanate powder with excellent performance, so that the contact between lithium titanate and electrolyte can be reduced, and the flatulence can be reduced; the conductive agent can adopt one or the combination of more than two of carbon black, conductive graphite, graphene, carbon nanofiber and carbon nanotube; the binder is preferably polytetrafluoroethylene or polyvinylidene fluoride or a combination of the polytetrafluoroethylene and the polyvinylidene fluoride, and fluorine contained in the binder can improve the electronic conductivity to a certain extent; the dispersant can be one or a combination of more than two of polyethylene glycol and cellulose, and has stable chemical performance and good dispersion effect; preferably, the mass ratio of the lithium titanate active powder to the conductive agent to the solvent to the binder to the dispersant is 100 to (2-6) to (45-85) to (1-2) to (2-5).
(2) Under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with a solvent to obtain premixed slurry; preferably, the ultrasonic frequency is 20-40KHz, and the time is 15-30 min; preferably, the solvent is N-methylpyrrolidone, water or ethanol;
(3) and (3) ball-milling the premixed slurry obtained in the step (2) through a sieve with more than 200 meshes to obtain the cathode slurry. The ball milling is preferably performed by adopting zirconia ball milling, the ball milling speed is 300-800r/min, and the time is 90-150 min.
Therefore, according to the invention, by dry-mixing the lithium titanate and other components, the lithium titanate, the binder, the dispersant and the conductive agent can be fully and uniformly mixed, the surface wettability of the materials is improved, and the agglomeration phenomenon among the materials easily caused by directly adding the solvent can be prevented; then adding a solvent, performing ultrasonic premixing, performing ultrasonic mixing to remove bubbles, reduce gaps among materials, fully infiltrate the interior of the materials, and then continuing to perform ball milling to fully and uniformly disperse the materials, so as to prevent large particles and improve the stability of the slurry and the adhesive force of the slurry on the current collector, therefore, the method provided by the invention obviously improves the performance of the slurry, is beneficial to coating the slurry on the current collector, and can shorten the pulping time to about 3 hours and obviously improve the production efficiency.
Example 1
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the following steps:
(1) firstly, 100g of graphene-coated lithium titanate active powder, 3g of carbon black, 1.5g of polytetrafluoroethylene and 3.5g of sodium carboxymethylcellulose are added into a stirring barrel and uniformly mixed;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with 60mL of water to obtain premixed slurry; the ultrasonic frequency is 20KHz, and the mixing time is 20 min;
(3) ball-milling the premixed slurry obtained in the step (2) by adopting zirconia, and sieving the ball-milled premixed slurry by using a 200-mesh sieve to obtain negative electrode slurry; the ball milling speed is 600r/min, and the time is 120 min.
Example 2
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the following steps:
(1) firstly, 100g of lithium titanate active powder, 4g of conductive graphite, 1.5g of polytetrafluoroethylene and 3g of carboxymethyl cellulose are added into a stirring barrel and uniformly mixed;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with 70mL of water to obtain premixed slurry; the ultrasonic frequency is 25KHz, and the mixing time is 20 min;
(3) ball-milling the premixed slurry obtained in the step (2) by adopting zirconia, and sieving the ball-milled premixed slurry by using a 200-mesh sieve to obtain negative electrode slurry; the ball milling speed is 800r/min, and the time is 100 min.
Example 3
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the following steps:
(1) firstly, 100g of lithium titanate active powder, 3g of graphene, 1g of polytetrafluoroethylene, 1g of polyvinylidene fluoride and 4g of carboxymethyl cellulose are added into a stirring barrel and uniformly mixed;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with 50mL of water to obtain premixed slurry; the ultrasonic frequency is 20KHz, and the mixing time is 25 min;
(3) ball-milling the premixed slurry obtained in the step (2) by adopting zirconia, and sieving the ball-milled premixed slurry by using a 200-mesh sieve to obtain negative electrode slurry; the ball milling speed is 600r/min, and the time is 110 min.
Example 4
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the following steps:
(1) firstly, 100g of lithium titanate active powder, 3g of carbon nanofiber, 1g of polytetrafluoroethylene, 1g of polyvinylidene fluoride and 3.5g of polyethylene glycol 4000 are added into a stirring barrel and uniformly mixed;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with 50mL of ethanol to obtain premixed slurry; the ultrasonic frequency is 30KHz, and the mixing time is 15 min;
(3) ball-milling the premixed slurry obtained in the step (2) by adopting zirconia, and sieving the ball-milled premixed slurry by using a 200-mesh sieve to obtain negative electrode slurry; the ball milling speed is 500r/min, and the time is 140 min.
Example 5
The invention provides a preparation method of lithium titanate battery cathode slurry, which comprises the following steps:
(1) firstly, 100g of lithium titanate active powder, 2.5g of graphene, 2g of polyvinylidene fluoride and 4g of polyethylene glycol 2000 are added into a stirring barrel and uniformly mixed;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with 65mLN methyl pyrrolidone to obtain premixed slurry; the ultrasonic frequency is 20KHz, and the mixing time is 20 min;
(3) and (3) ball-milling the premixed slurry obtained in the step (2) by adopting zirconia, and sieving by using a 200-mesh sieve to obtain the cathode slurry. The ball milling speed is 600r/min, and the time is 130 min.
The stability of the negative electrode slurry obtained in example 1-2 is shown in Table 1-2.
Table 1 stability of negative electrode slurry obtained in example 1
| Time of measurement | Viscosity mPas | Solid content% |
| Completing the pulping | 4150 | 44.8 |
| Stored for 8h | 4300 | 44.8 |
| Stored for 16h | 4370 | 44.9 |
| Stored for 24h | 4400 | 45.1 |
Table 2 stability of negative electrode slurry obtained in example 2
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A preparation method of lithium titanate battery negative electrode slurry is characterized by comprising the following steps:
(1) firstly, uniformly mixing lithium titanate active powder, a conductive agent, a binder and a dispersing agent;
(2) under the ultrasonic condition, uniformly mixing the mixed powder obtained in the step (1) with a solvent to obtain premixed slurry;
(3) and (3) ball-milling the premixed slurry obtained in the step (2) and sieving the premixed slurry with a sieve of more than 200 meshes to obtain the cathode slurry.
2. The method for preparing the battery negative electrode slurry according to claim 1, wherein the conductive agent in the step (1) is one or a combination of more than two of carbon black, conductive graphite, graphene, carbon nanofiber and carbon nanotube; the solvent in the step (2) is N-methyl pyrrolidone, water or ethanol; the binder is polytetrafluoroethylene or/and polyvinylidene fluoride; the dispersant is one or a combination of more than two of polyethylene glycol and cellulose.
3. The method for preparing the negative electrode slurry of the lithium titanate battery as claimed in claim 2, wherein the mass ratio of the lithium titanate active powder, the conductive agent, the solvent, the binder and the dispersant is 100: 2-6: 45-85: 1-2: 2-5.
4. The method for preparing the negative electrode slurry of the lithium titanate battery according to claim 1, wherein the lithium titanate active powder is a carbon-or graphene-coated lithium titanate active powder.
5. The preparation method of lithium titanate battery negative electrode slurry as claimed in claim 1, characterized in that the ultrasonic frequency of step (2) is 20-40KHz, and the time is 15-30 min.
6. The preparation method of lithium titanate battery negative electrode slurry as claimed in claim 1, characterized in that zirconia is adopted for ball milling in the step (3), the ball milling rate is 300-800r/min, and the time is 90-150 min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111668455A (en) * | 2020-05-22 | 2020-09-15 | 宜春清陶能源科技有限公司 | Method for reducing bubble amount in process of coating slurry on surface of battery pole piece and application of method in solid electrolyte coating |
| CN112467065A (en) * | 2020-11-20 | 2021-03-09 | 山东精工电子科技有限公司 | Rapid and efficient preparation method of lithium ion battery slurry, pole piece and battery thereof |
| CN114744159A (en) * | 2022-05-07 | 2022-07-12 | 中国人民解放军陆军工程大学 | Battery cathode slurry manufacturing method and battery |
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| CN103872306A (en) * | 2014-03-24 | 2014-06-18 | 四川剑兴锂电池有限公司 | Preparation method of lithium titanate negative electrode slurry |
| CN104577071A (en) * | 2015-01-28 | 2015-04-29 | 山东齐星新能源科技有限责任公司 | Dry-powder pulping method of lithium-ion battery |
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| CN107731563A (en) * | 2017-06-21 | 2018-02-23 | 中国科学院苏州纳米技术与纳米仿生研究所南昌研究院 | A kind of preparation method of various dimensions conductive agent composite conducting slurry |
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