CN115084452A - Lithium iron phosphate pulping process combining mechanical and chemical dispersion - Google Patents
Lithium iron phosphate pulping process combining mechanical and chemical dispersion Download PDFInfo
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- CN115084452A CN115084452A CN202210682751.0A CN202210682751A CN115084452A CN 115084452 A CN115084452 A CN 115084452A CN 202210682751 A CN202210682751 A CN 202210682751A CN 115084452 A CN115084452 A CN 115084452A
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- 239000006185 dispersion Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 18
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 16
- 238000004537 pulping Methods 0.000 title claims abstract description 16
- 239000000126 substance Substances 0.000 title claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 48
- 238000003756 stirring Methods 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000000243 solution Substances 0.000 claims abstract description 20
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 239000003292 glue Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000006258 conductive agent Substances 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 239000006245 Carbon black Super-P Substances 0.000 claims abstract description 9
- 239000002033 PVDF binder Substances 0.000 claims abstract description 9
- 239000011259 mixed solution Substances 0.000 claims abstract description 8
- 239000006256 anode slurry Substances 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 9
- 238000009775 high-speed stirring Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052744 lithium Inorganic materials 0.000 abstract description 11
- 238000009826 distribution Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 239000013543 active substance Substances 0.000 abstract description 5
- 238000004090 dissolution Methods 0.000 abstract description 2
- 239000011267 electrode slurry Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
- 239000007774 positive electrode material Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 230000001112 coagulating effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000010902 jet-milling Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000019864 coconut oil Nutrition 0.000 description 1
- 239000003240 coconut oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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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
- H01M4/13—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
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
-
- 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
- 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
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a lithium iron phosphate pulping process combining mechanical and chemical dispersion, which comprises the steps of firstly adding a PVDF binder into an NMP solvent for complete dissolution to form a glue solution, adding a dispersing agent into the glue solution to form a mixed solution, then adding a conductive agent Super-P and ultrafine powder LFP into the mixed solution, stirring and blending to prepare a first slurry, and then preparing a positive electrode slurry through mechanical dispersion. According to the invention, the dispersing agent is added into the glue solution, so that the slurry is prevented from being coagulated, the subsequent processing is facilitated, the active substance ultrafine powder LFP is fully contacted with the dispersing agent through strong mechanical dispersion, the uniform dispersion effect is achieved, the particle size distribution range of the prepared anode slurry is lower, the particle size is smaller, the slurry dispersion performance is excellent and easy, the conductivity, the battery capacity, the cycle performance, the consistency and the like of the anode are improved, and the safety of the lithium battery is ensured.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium iron phosphate pulping process combining mechanical and chemical dispersion.
Background
The lithium battery is a new energy battery widely applied in modern society, and mainly comprises a positive electrode material, a negative electrode material, a diaphragm, electrolyte and the like, wherein the positive electrode material accounts for more than 40% of the total cost of the lithium battery, and the performance of the positive electrode material directly influences various performance indexes of the lithium battery, such as viscosity, fineness and the like, so that the positive electrode material of the lithium battery occupies a core position in the lithium battery.
The lithium battery anode materials which are already marketed comprise products such as lithium cobaltate, lithium manganate, lithium iron phosphate, ternary materials and the like. The existing preparation process of lithium iron phosphate is that PVDF is firstly dissolved in NMP solvent to form glue solution, SP and CNT conductive solution are added into the glue solution to form conductive glue through high-speed dispersion, and then positive active material LFP is added into the conductive glue, and then positive slurry is formed through high-speed dispersion and then through adjustment and adhesion. The LFPs currently commercially available are obtained by essentially jet milling spherical LFPs obtained by spray drying. The conductivity and lithium ion diffusion coefficient of such nanostructured LFP materials are low. However, jet milling is energy intensive and difficult to control, and produces large amounts of fines, which adversely affect the pulping process. Compared with the massive and micron-sized electrode materials, the nano-structured material has the advantages of short transmission distance, large specific surface area, high reversible capacity, stable cycle performance, high electron transmission speed and the like. Although the nano-scale particles have stronger electrolyte adsorption capacity than the micron-scale particles, the surface energy caused by the large specific surface area of the nano-scale particles also makes the nano-scale particles easy to agglomerate, so that the processing is inconvenient. In addition, during the pulping process, the slurry is not uniformly dispersed due to agglomeration, so that the conductivity of the positive electrode is reduced, the capacity, the cycle performance and the consistency of the lithium ion battery are directly reduced, the positive electrode of the protruding part is easily extruded to pierce a diaphragm during the assembly process, and the safety of the battery is reduced.
Disclosure of Invention
The invention aims to provide a lithium iron phosphate pulping process combining mechanical and chemical dispersion aiming at the defects of the prior art, the prepared anode slurry has a lower particle size distribution range, smaller particle size and excellent slurry dispersion performance, the conductivity, the battery capacity, the cycle performance, the consistency and the like of the anode are improved, and the safety of a lithium battery is ensured.
The technical scheme for realizing the aim of the invention is as follows:
a lithium iron phosphate pulping process combining mechanical and chemical dispersion comprises the following steps:
step S1: weighing raw materials, wherein the raw materials comprise, by weight, ultrafine powder LFP 92-95%, PVDF binder 2-4% and conductive agent Super-P2-4%;
step S2: adding a PVDF binder into an NMP solvent for complete dissolution to form a glue solution, adding 0.5-1% of a liquid dispersing agent into the glue solution at room temperature, and sequentially carrying out medium-speed stirring, high-speed stirring and low-speed vacuum defoaming to form a mixed solution;
step S3: adding a conductive agent Super-P and pre-dispersed superfine powder LFP into the mixed solution, fully stirring, and adjusting viscosity to obtain a first slurry with solid content of 48%;
step S4: mechanically dispersing the first slurry to prepare positive slurry;
further, the dispersant is AEO-7.
Further, the ultrafine powder LFP satisfies D50 ═ 0.361 μm.
Further, the mechanical dispersion adopts a grinding machine, a cooling water valve of the grinding machine is opened in advance, the first slurry is moved to the grinding machine, and the grinding is carried out at the temperature of not higher than 50 ℃.
Further, NMP solvent was added to the first slurry for premixing before mechanical dispersion was performed.
Further, in the step S3, a planetary stirring device is used for stirring for at least 4 hours, and when the conductive agent Super-P is added, low-speed stirring, medium-speed stirring and high-speed stirring are sequentially used, and then the pre-dispersed ultra-fine powder LFP is sequentially added and subjected to low-speed stirring and medium-speed stirring.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) the preparation process of the invention mixes the ultrafine powder LFP in the glue solution added with the dispersant to prevent the slurry from coagulating, thereby facilitating the subsequent processing, and leads the active substance ultrafine powder LFP to be fully contacted with the dispersant through strong mechanical dispersion to achieve the uniform dispersion effect.
(2) The dispersant is AEO-7, belongs to a nonionic surfactant, uses coconut oil alcohol of C12-C16, has EO number of 7, is a light yellow liquid, and has good wettability, foamability, detergency and emulsifying power. AEO-7 is used as a dispersant, so that agglomeration among fine powder can be effectively controlled, and the distance among particles can be increased to lubricate the particles and improve the flowability of slurry.
(3) The ultrafine powder LFP meets the requirement that D50 is 0.361 mu m, realizes a nano-scale structural material, has short transmission distance, large specific surface area, high reversible capacity, stable cycle performance and higher electron transmission speed, and improves the performance of the anode slurry.
(4) According to the invention, the mechanical dispersion adopts the sand mill, the dispersion can be rapidly and efficiently carried out, the whole sand milling process is ensured to be carried out at the temperature of not higher than 50 ℃ by opening the cooling water valve of the sand mill in advance, and the viscosity and the fluidity of the slurry are changed due to overhigh temperature, so that the coating is difficult or the performance of the slurry is changed. Meanwhile, the sand mill has a strong mechanical dispersion effect, can fully mix and contact active substances with a dispersing agent, achieves the effect of uniform dispersion, can uniformly disperse conductive carbon black with small particle size, and improves the conductivity of the slurry.
(5) According to the invention, before mechanical dispersion, the NMP solvent is added into the first slurry for premixing, so that the fluidity of the slurry is improved, the slurry blockage is effectively prevented, and the complete mechanical dispersion of the slurry is ensured.
(6) The invention adopts planetary stirring equipment to stir for at least 4 hours, fully stirs the slurry, fully disperses the main material, avoids the existence of large particles, ensures the uniform dispersion of the slurry, and is easy to screen and coat.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a graph showing the particle size distribution of example 1, comparative example 1 and comparative example 2 of the present invention.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
(example 1)
In this embodiment, a lithium iron phosphate pulping process combining mechanical and chemical dispersion is adopted, and the positive electrode material ultra-fine powder LFP is mixed in the prepared mixed solvent of NMP and the dispersant, so as to prevent the slurry from coagulating, and then the active material ultra-fine powder LFP is fully contacted with the dispersant through strong mechanical dispersion, thereby achieving a uniform dispersion effect.
Specifically, the lithium iron phosphate pulping process combining mechanical and chemical dispersion of the embodiment includes the following steps:
step S1: weighing raw materials, wherein the raw materials comprise 94% of ultrafine powder LFP, 3% of PVDF binder and 3% of conductive agent Super-P, the ultrafine powder LFP meets the requirement that D50 is 0.361 mu m, the nano-scale structure material is realized, the transmission distance is short, the specific surface area is large, the reversible capacity is high, the cycle performance is stable, the electron transmission speed is high, and the performance of the anode slurry is improved.
Step S2: the PVDF binder is added into NMP solvent to be completely dissolved to form glue solution, 0.5% of AEO-7 is added into the glue solution at room temperature to serve as a liquid dispersing agent, the slurry is prevented from being coagulated, the subsequent processing is convenient, and meanwhile, the AEO-7 serves as the dispersing agent, so that on one hand, the agglomeration of fine powder can be effectively controlled, on the other hand, the distance between particles can be increased to lubricate the particles, and the fluidity of the slurry is improved. And (2) sequentially carrying out medium-speed stirring, high-speed stirring and low-speed vacuum defoaming by adopting a planetary stirring device to form a mixed solution, wherein the medium-speed stirring and mixing is carried out at 25 +/-2 rpm for 5-8 m/s for 10min, the high-speed stirring and mixing is carried out at 35 +/-2 rpm for 8-11 m/s for 180min, and the low-speed vacuum defoaming and mixing is carried out at 15 +/-2 rpm for 30 min.
Step S3: adding conductive agent Super-P and pre-dispersed superfine powder LFP prepared by a spray drying method into the mixed solution, stirring for not less than 4 hours by adopting planetary stirring equipment, and adjusting the viscosity to a first slurry with solid content of 48%. Specifically, when the conductive agent Super-P is added, low-speed stirring, medium-speed stirring and high-speed stirring are sequentially adopted, wherein the medium-speed stirring and mixing are carried out at 15 +/-2 rpm for dispersing 1-5 m/s for 10min, the medium-speed stirring and mixing are carried out at 25 +/-2 rpm for dispersing 5-8 m/s for 30min, the high-speed stirring and mixing are carried out at 35 +/-2 rpm for dispersing 8-11 m/s for 60 min. And (3) adding the superfine powder LFP, and sequentially carrying out low-speed stirring and medium-speed stirring, wherein the medium-speed stirring and mixing are carried out at 15 +/-2 rpm, the dispersion is carried out at 1-5 m/s for 10min, the medium-speed stirring and mixing are carried out at 25 +/-2 rpm, the dispersion is carried out at 5-8 m/s, and the dispersion is carried out for 30 min. And finally stirring and mixing at a high speed of 35 +/-2 rpm, and dispersing for 8-11 m/s for 180 min. Through carrying out abundant stirring to the thick liquids, make the main material fully dispersed, avoid the existence of large granule, guarantee that the thick liquids dispersion is even, the coating that sieves in the lithium cell preparation is easily.
Step S4: and mechanically dispersing the first slurry by using a sand mill to prepare the anode slurry. Firstly, adding an NMP solvent into first slurry for premixing, so that the fluidity of the slurry is improved, the slurry is effectively prevented from being blocked, and the slurry is ensured to completely enter a sand grinder for sand grinding; a cooling water valve of the sanding machine is opened in advance, so that the whole sanding process is ensured to be carried out at a temperature of not higher than 50 ℃, and the problems that the viscosity and the fluidity of the slurry are changed due to overhigh temperature, the coating is difficult or the performance of the slurry is changed are avoided; move first thick liquids to the dull polish machine and sand (rotational speed 500rpm), form anodal thick liquids, because the sand mill has powerful mechanical dispersion effect, can make active substance and dispersant intensive mixing contact, reach evenly dispersed effect, also can make the less conductive carbon black dispersion of particle diameter even simultaneously, improve the conducting property of thick liquids.
Comparative example 1
The preparation process of comparative example 1 is similar to example 1 except that AEO-7 is not added to the cement.
Comparative example 2
Comparative example 2 adopts a conventional preparation process, in which PVDF is first dissolved in NMP solvent to form a glue solution, then conductive agents Super-P and CNT conductive solution are added to the glue solution to form a conductive paste through high-speed dispersion, and then positive electrode active material LFP is added to the conductive paste, and then positive electrode slurry is formed through high-speed dispersion and then through adjustment and adhesion.
The positive electrode pastes prepared in example 1, comparative example 1 and comparative example 2 were respectively labeled as S1, S2 and S0, and their particle size distributions and fineness were compared, and the results of the particle size distributions are shown in fig. 1. It can be seen from fig. 1 that the median particle size of the S1 slurry is small, and the overall particle size range is small, the particle size distribution range and the median particle size of the S2 slurry are both higher than those of the S1 slurry, and the particle size distribution range of the S0 slurry is very wide, and the median particle size is also very large. The fineness of the S1 slurry was found to be 3 μm, the fineness of the S2 slurry was found to be 7 μm, and the fineness of the S0 slurry was found to be 5 μm, while the S2 slurry was found to have a large number of particle aggregates and the S0 slurry showed sporadic large particles of between 30 μm and 60 μm. It was thus confirmed that 0.5% AEO-7 as a dispersant was effective in controlling the agglomeration between fines and achieving the best slurry distribution.
The preparation process mixes the ultrafine powder LFP in the glue solution added with AEO-7, prevents slurry from coagulating, facilitates subsequent processing, and mechanically disperses through a powerful sand mill, so that the active substance ultrafine powder LFP is fully contacted with the dispersing agent, and uniform dispersion effect is achieved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A lithium iron phosphate pulping process combining mechanical and chemical dispersion is characterized by comprising the following steps:
step S1: weighing raw materials, wherein the raw materials comprise, by weight, ultrafine powder LFP 92-95%, PVDF binder 2-4% and conductive agent Super-P2-4%;
step S2: adding a PVDF binder into an NMP solvent to be completely dissolved to form a glue solution, adding 0.5-1% of a liquid dispersant into the glue solution at room temperature, and sequentially carrying out medium-speed stirring, high-speed stirring and low-speed vacuum defoaming to form a mixed solution;
step S3: sequentially adding a conductive agent Super-P and pre-dispersed ultrafine powder LFP into the mixed solution, fully stirring, and adjusting viscosity to obtain a first slurry with solid content of 48%;
step S4: and mechanically dispersing the first slurry to prepare the anode slurry.
2. The lithium iron phosphate pulping process combining mechanical and chemical dispersion as claimed in claim 1, characterized in that: the dispersant is AEO-7.
3. The lithium iron phosphate pulping process combining mechanical and chemical dispersion as claimed in claim 1, characterized in that: the ultrafine powder LFP satisfies D50 ═ 0.361 μm.
4. The lithium iron phosphate pulping process combining mechanical and chemical dispersion as claimed in claim 1, characterized in that: and the mechanical dispersion adopts a sand mill, a cooling water valve of the sand mill is opened in advance, the first slurry is moved to the sand mill, and the sand milling is carried out at the temperature of not higher than 50 ℃.
5. The lithium iron phosphate pulping process combining mechanical and chemical dispersion as claimed in claim 1, characterized in that: NMP solvent was added to the first slurry for pre-mixing before mechanical dispersion was performed.
6. The lithium iron phosphate pulping process combining mechanical and chemical dispersion as claimed in claim 1, characterized in that: and in the step S3, a planetary stirring device is adopted for stirring for at least 4 hours, the low-speed stirring, the medium-speed stirring and the high-speed stirring are sequentially adopted when the conductive agent Super-P is added, and the pre-dispersed ultrafine powder LFP is added and sequentially subjected to the low-speed stirring and the medium-speed stirring.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115498190A (en) * | 2022-10-26 | 2022-12-20 | 楚能新能源股份有限公司 | Dispersing agent for lithium iron phosphate anode slurry, preparation method of lithium iron phosphate anode slurry and lithium ion battery |
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| CN113224269A (en) * | 2021-04-25 | 2021-08-06 | 天津市捷威动力工业有限公司 | Efficient and controllable lithium iron phosphate slurry mixing process |
| CN113964320A (en) * | 2021-10-15 | 2022-01-21 | 湖北亿纬动力有限公司 | Lithium ion battery and preparation method thereof |
| CN114464775A (en) * | 2022-01-26 | 2022-05-10 | 江苏海基新能源股份有限公司 | Lithium ion battery anode slurry homogenizing process, anode plate and lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115498190A (en) * | 2022-10-26 | 2022-12-20 | 楚能新能源股份有限公司 | Dispersing agent for lithium iron phosphate anode slurry, preparation method of lithium iron phosphate anode slurry and lithium ion battery |
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