CN112592734A - Continuous production method of lithium ion battery cathode coating material - Google Patents
Continuous production method of lithium ion battery cathode coating material Download PDFInfo
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- CN112592734A CN112592734A CN202011329636.2A CN202011329636A CN112592734A CN 112592734 A CN112592734 A CN 112592734A CN 202011329636 A CN202011329636 A CN 202011329636A CN 112592734 A CN112592734 A CN 112592734A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
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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
- 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
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- 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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- Electrochemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a continuous production method of a lithium ion battery cathode coating material, which comprises the following steps: (1) preheating raw materials: preheating raw material ethylene tar or ethylene residual oil to 70-100 ℃ in a raw oil storage tank, conveying the preheated raw material to a primary condensation preheater and a raw oil preheater by using a conveying pump, heating the raw material to 140-170 ℃ by using the primary condensation preheater, and heating the raw material to 200-300 ℃ by using the raw oil preheater; (2) and (3) rectification: conveying the preheated raw materials into a rectifying tower through a conveying pump, and carrying out rectification treatment to obtain asphalt with a softening point of less than 200 ℃; (3) and (3) distillation: conveying the product into a short-path distiller by using a conveying pump, wherein the temperature in the short-path distiller is 320-400 ℃, and the absolute vacuum degree is-0.098 MPa, so as to obtain asphalt with the softening point of more than 250 ℃; (4) and (3) filtering: melting and filtering the materials at high temperature, wherein the filtering precision is 5-20 mu m; (5) granulating and storing: and (4) granulating and storing the material obtained after filtering in the step (4).
Description
Technical Field
The patent mainly aims to solve the problem of a discontinuous production method in the technical field of lithium ion battery cathode coating materials. Preparing the high-softening-point coated asphalt which can be used for producing the lithium ion battery cathode material.
Background
Due to the gradual depletion of non-renewable resources and the era background that environmental awareness is more and more attracting people to pay attention, battery technology makes a rapid progress, and secondary environment-friendly green batteries become the first choice for the development of battery technology. The lithium ion battery becomes a preferred secondary battery series developed in the battery industry due to the advantages of high specific energy, high specific capacity, long cycle stability, environmental protection and the like.
At present, most of negative electrode materials of lithium ion batteries are carbon materials, wherein a graphite electrode is used as one of mainstream materials, but poor compatibility of the graphite electrode and an electrolyte and irreversible decomposition of an organic solvent on the carbon negative electrode can generate negative effects on electrode behaviors, so that a graphite layer expands and contracts to cause exfoliation, and thus, the cycle efficiency is reduced. In order to improve the defects of the graphite electrode, the surface of the graphite electrode needs to be coated. The coating treatment can effectively prevent the graphite from generating a layered stripping phenomenon in the charging and discharging processes, thereby effectively improving the cycle stability of the composite carbon material, improving the interface property of a graphite electrode, preventing the separation of a structural layer caused by the insertion of solvated lithium ions into the graphite layer to reduce the irreversible capacity of the graphite electrode, and improving the coulombic efficiency, the specific capacity and the discharge capacity after stabilization to different degrees. The problems that the conventional lithium ion battery cathode coating material needs multi-kettle switching, cannot be continuously produced, has complex process, high cost, high content of quinoline insoluble substances and high ash content, and the produced high-softening-point asphalt has uneven molecular weight distribution are solved.
Therefore, the applicant provides a continuous production method of the lithium ion battery cathode coating material, which has the advantages of simple process, single-kettle operation, continuous production and the like.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a continuous production method of a lithium ion battery cathode coating material, which has low cost, can carry out continuous production and can ensure narrow molecular weight distribution range of high-softening-point asphalt.
The invention aims to solve the technical problem of providing a continuous production method of a lithium ion battery cathode coating material, which has the advantages of simple process, single kettle operation, continuous production and the like.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a continuous production method of a lithium ion battery negative electrode coating material is characterized by comprising the following steps:
(1) preheating raw materials: preheating raw material ethylene tar or ethylene residual oil to 70-100 ℃ in a raw oil storage tank, conveying the preheated raw material to a primary condensation preheater and a raw oil preheater by using a conveying pump, heating the raw material to 140-170 ℃ by using the primary condensation preheater, and heating the raw material to 200-300 ℃ by using the raw oil preheater;
(2) and (3) rectification: conveying the preheated raw materials in the step (1) into a rectifying tower through a conveying pump, and carrying out rectification treatment to obtain asphalt with a softening point of less than 200 ℃; the rectification time is 8-12 hours.
(3) And (3) distillation: conveying the product obtained in the step (2) into a short-distance distiller by using a conveying pump, wherein the temperature in the short-distance distiller is 320-400 ℃, and the absolute vacuum degree is-0.09 to-0.098 MPa, so as to obtain asphalt with the softening point of more than 250 ℃;
(4) and (3) filtering: melting and filtering the material obtained in the step (3) at high temperature, wherein the filtering precision is 5-20 mu m;
(5) granulating and storing: and (4) granulating and storing the material obtained after filtering in the step (4).
As an improvement, the rectifying tower is provided with an upper outlet and a lower outlet, the upper outlet is connected with a primary condensation preheater, the lower outlet is connected with the middle part of the rectifying tower, after the raw material preheated in the step (1) enters the rectifying tower, part of components with low boiling points enter the primary condensation preheater through the upper outlet of the rectifying tower due to high temperature and negative pressure of a system in the rectifying tower, and enter the secondary condensation preheater again after being subjected to heat exchange and cyclic heating with the raw material oil in the primary condensation preheater, and tail gas such as non-condensable gas in the primary condensation preheater enters a tail gas treatment system (which is in conventional operation); after condensation in the primary condensation preheater and the secondary cooler, the byproduct oil enters a light oil buffer tank for collection, and a byproduct oil delivery pump pumps light components into a byproduct storage tank; and (2) the heavy component enters the bottom of a rectifying tower after passing through a tower plate from the middle part to the lower part of the rectifying tower, the heavy component is pumped into a reboiler by a circulating pump of the rectifying tower for further heating and evaporation, after part of light components are evaporated out, the softening point of crude asphalt reaches 150-200 ℃, the crude asphalt is conveyed to a short-distance distiller by a product pump of the rectifying tower, the light components are further separated under the conditions of high temperature and high vacuum, and the light components are collected and then enter a light oil buffer tank. And (3) feeding the product in the short-path distiller into a product kettle, collecting the product with the softening point of 250-280 ℃, after the product is melted and filtered, conveying the product into a granulator through a product conveying pump for granulation, packaging the product through a packaging machine, and finally warehousing the packaged product.
The invention solves the problems that the production of the existing lithium ion battery cathode coating material needs multi-kettle switching, can not realize continuous production, has complex process, high cost, high quinoline insoluble content and high ash content, and the produced high-softening-point asphalt has uneven molecular weight distribution.
Compared with the prior art, the invention can utilize ethylene tar, ethylene heavy oil or ethylene tar residue oil and the like as raw materials, and the raw materials have wide sources. The invention adopts the processes of reduced pressure distillation, short-path distillation, melt filtration and cooling granulation to prepare the high-softening-point asphalt which can be used for producing the lithium ion battery cathode coating material, thereby realizing continuous production, remarkably reducing the production cost and realizing the product industrialization.
Drawings
FIG. 1 is a flow chart of the preparation process of the present invention.
Shown in the figure: 1 is an oil discharge groove; 2, a raw oil storage tank; 3 is a secondary cooler; 4 is a primary condensation preheater; 5 is a raw oil preheater; 6 is a light oil buffer tank; 7 is a reboiler; 8 is a vacuum rectification column; 9 is a short path distiller; 10 is a finished product kettle; 11 is a granulator; 12 is a hoist; 13 is a finished product bin, and 14 is an exhaust gas treatment system.
Detailed Description
Preferred embodiments of the present invention are described in detail below.
Example 1: referring to fig. 1, which is a schematic structural diagram of embodiment 1 of the present invention,
a continuous production method of a lithium ion battery negative electrode coating material is characterized by comprising the following steps:
(1) preheating raw materials: preheating raw material ethylene tar or ethylene residual oil to 70-100 ℃ in a raw oil storage tank, conveying the preheated raw material to a primary condensation preheater and a raw oil preheater by using a conveying pump, heating the raw material to 140-170 ℃ by using the primary condensation preheater, and heating the raw material to 200-300 ℃ by using the raw oil preheater;
(2) and (3) rectification: conveying the preheated raw materials in the step (1) into a rectifying tower through a conveying pump, and carrying out rectification treatment to obtain asphalt with a softening point of less than 200 ℃; the rectification time is 8-12 hours.
(3) And (3) distillation: conveying the product obtained in the step (2) into a short-distance distiller by using a conveying pump, wherein the temperature in the short-distance distiller is 320-400 ℃, and the absolute vacuum degree is-0.09 to-0.098 MPa, so as to obtain asphalt with the softening point of more than 250 ℃;
(4) and (3) filtering: melting and filtering the material obtained in the step (3) at high temperature, wherein the filtering precision is 5-20 mu m;
(5) granulating and storing: and (4) granulating and storing the material obtained after filtering in the step (4).
As an improvement, the rectifying tower is provided with an upper outlet and a lower outlet, the upper outlet is connected with a primary condensation preheater, the lower outlet is connected with the middle part of the rectifying tower, after the raw material preheated in the step (1) enters the rectifying tower, part of components with low boiling points enter the primary condensation preheater through the upper outlet of the rectifying tower due to high temperature and negative pressure of a system in the rectifying tower, and enter the secondary condensation preheater again after being subjected to heat exchange and cyclic heating with the raw material oil in the primary condensation preheater, and tail gas such as non-condensable gas in the primary condensation preheater enters a tail gas treatment system (which is in conventional operation); after condensation in the primary condensation preheater and the secondary cooler, the byproduct oil enters a light oil buffer tank for collection, and a byproduct oil delivery pump pumps light components into a byproduct storage tank; and (2) the heavy component enters the bottom of a rectifying tower after passing through a tower plate from the middle part to the lower part of the rectifying tower, the heavy component is pumped into a reboiler by a circulating pump of the rectifying tower for further heating and evaporation, after part of light components are evaporated out, the softening point of crude asphalt reaches 150-200 ℃, the crude asphalt is conveyed to a short-distance distiller by a product pump of the rectifying tower, the light components are further separated under the conditions of high temperature and high vacuum, and the light components are collected and then enter a light oil buffer tank. And (3) feeding the product in the short-path distiller into a product kettle, collecting the product with the softening point of 250-280 ℃, after the product is melted and filtered, conveying the product into a granulator through a product conveying pump for granulation, packaging the product through a packaging machine, and finally warehousing the packaged product.
The invention solves the problems that the production of the existing lithium ion battery cathode coating material needs multi-kettle switching, can not realize continuous production, has complex process, high cost, high quinoline insoluble content and high ash content, and the produced high-softening-point asphalt has uneven molecular weight distribution.
Ethylene residual oil
TABLE 1
Finished product
TABLE 2
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (1)
1. A continuous production method of a lithium ion battery negative electrode coating material is characterized by comprising the following steps:
(1) preheating raw materials: preheating raw material ethylene tar or ethylene residual oil to 70-100 ℃ in a raw oil storage tank, conveying the preheated raw material to a primary condensation preheater and a raw oil preheater by using a conveying pump, heating the raw material to 140-170 ℃ by using the primary condensation preheater, and heating the raw material to 200-300 ℃ by using the raw oil preheater;
(2) and (3) rectification: conveying the preheated raw materials in the step (1) into a rectifying tower through a conveying pump, and carrying out rectification treatment to obtain asphalt with a softening point of less than 200 ℃;
(3) and (3) distillation: conveying the product obtained in the step (2) into a short-distance distiller by using a conveying pump, wherein the temperature in the short-distance distiller is 320-400 ℃, and the absolute vacuum degree is-0.09 to-0.098 MPa, so as to obtain asphalt with the softening point of more than 250 ℃;
(4) and (3) filtering: melting and filtering the material obtained in the step (3) at high temperature, wherein the filtering precision is 5-20 mu m;
(5) granulating and storing: and (4) granulating and storing the material obtained after filtering in the step (4).
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| CN202011329636.2A CN112592734A (en) | 2020-11-24 | 2020-11-24 | Continuous production method of lithium ion battery cathode coating material |
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| CN202011329636.2A CN112592734A (en) | 2020-11-24 | 2020-11-24 | Continuous production method of lithium ion battery cathode coating material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113337304A (en) * | 2021-06-19 | 2021-09-03 | 天津北海石化工程有限公司 | Continuous production method of graphite coating material |
| CN114752397A (en) * | 2021-11-12 | 2022-07-15 | 中国神华煤制油化工有限公司 | Coated asphalt and preparation method and device thereof |
| CN115161054A (en) * | 2022-09-02 | 2022-10-11 | 天津北海石化工程有限公司 | Production method of graphite coating material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337304A (en) * | 2021-06-19 | 2021-09-03 | 天津北海石化工程有限公司 | Continuous production method of graphite coating material |
| CN114752397A (en) * | 2021-11-12 | 2022-07-15 | 中国神华煤制油化工有限公司 | Coated asphalt and preparation method and device thereof |
| CN115161054A (en) * | 2022-09-02 | 2022-10-11 | 天津北海石化工程有限公司 | Production method of graphite coating material |
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