CN114068880A - Preparation method of high-efficiency energy-saving graphite cathode - Google Patents
Preparation method of high-efficiency energy-saving graphite cathode Download PDFInfo
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- CN114068880A CN114068880A CN202111385587.9A CN202111385587A CN114068880A CN 114068880 A CN114068880 A CN 114068880A CN 202111385587 A CN202111385587 A CN 202111385587A CN 114068880 A CN114068880 A CN 114068880A
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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
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
Abstract
The invention discloses a preparation method of a high-efficiency energy-saving graphite cathode, and relates to the technical field of graphite cathode preparation. The preparation method of the high-efficiency energy-saving graphite cathode specifically comprises the following operations: s1, hot packing: putting the materials to be wrapped in the heat-packing device which is insulated at the temperature of 450-. According to the preparation method of the high-efficiency energy-saving graphite cathode, high-temperature hot-packed materials can be directly put into the rotary furnace for pre-carbonization treatment, the energy consumption of cooling and reheating the hot-packed materials is saved, meanwhile, the rotary furnace is in continuous operation, and the productivity, the efficiency and the energy consumption have obvious advantages compared with the traditional pushed slab kiln/roller kiln.
Description
Technical Field
The invention relates to the technical field of graphite cathode preparation, in particular to a preparation method of a high-efficiency energy-saving graphite cathode.
Background
The lithium ion battery as a new generation of green environmental protection battery has the advantages of high specific energy, wide application temperature range, good cycle stability, no pollution, good safety performance and the like, and has wide application in the fields of power, energy storage, digital code, small power and the like.
With the rapid development of new energy automobiles in recent years, the yield of artificial graphite negative electrodes is also rapidly increasing. The shipment of the artificial graphite is increased from 8.03 ten thousand tons in 2016 to 30.7 ten thousand tons in 2020, the annual average composite growth rate is nearly 40 percent, and the shipment in the first half of 2021 is 28.22 ten thousand tons, and the year-on-year growth rate is over 100 percent.
The artificial graphite requires a plurality of stages of temperature raising and lowering processes, and therefore, energy consumption is enormous. With the establishment of the double-carbon target in China, although the artificial graphite industry belongs to the new material industry, energy conservation and customs attack also need to be continuously carried out, and the energy consumption in the product manufacturing process is reduced.
The heat-insulating bag material in the production process of the conventional artificial graphite needs to be cooled and then is subjected to pre-carbonization treatment, so that energy consumed by secondary heating and cooling is wasted in the process, the cost is increased, the working efficiency is reduced, and a series of environmental pollution problems are caused.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of an efficient energy-saving graphite cathode, which solves the problems that the heat-coated material needs to be cooled and then subjected to pre-carbonization treatment in the conventional production process of artificial graphite, the energy consumed by secondary heating and cooling is wasted in the process, the cost is increased, the working efficiency is reduced, and a series of environmental pollution is caused.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a preparation method of a high-efficiency energy-saving graphite cathode specifically comprises the following operations:
s1, hot packing: putting the materials to be wrapped in the heat-packing device which is insulated at the temperature of 450-; the adhesive is one or more of petroleum asphalt, coal asphalt, furfural resin, furan resin or epoxy resin, and the hot pack is one of a vertical hot pack kettle, a horizontal hot pack kettle, a roller furnace and a rotary furnace;
s2, pre-carbonization: directly and continuously conveying the materials subjected to hot ladle treatment into a rotary furnace at high temperature, continuously moving the materials in the rotary furnace forwards along with the rotation of the rotary furnace, and then heating, preserving heat and cooling, wherein the rotating speed of the rotary furnace is 1-10 r/min, the heating rate is 1-10 r/min, the final temperature is 1000-;
s3, graphitization treatment: performing graphitization high-temperature treatment at 2700 ℃ < 3200 ℃ for 48 hours, wherein the graphitization treatment is performed in a graphitization processing furnace;
s4, performing finished product treatment, wherein the finished product treatment process comprises the following steps in sequence: screening, demagnetizing, screening and packaging.
(III) advantageous effects
The invention provides a preparation method of a high-efficiency energy-saving graphite cathode. The method has the following beneficial effects:
according to the preparation method of the high-efficiency energy-saving graphite cathode, high-temperature hot-packed materials can be directly put into the rotary furnace for pre-carbonization treatment, the energy consumption of cooling and reheating the hot-packed materials is saved, meanwhile, the rotary furnace is in continuous operation, and the productivity, the efficiency and the energy consumption have obvious advantages compared with the traditional pushed slab kiln/roller kiln.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a preparation method of a high-efficiency energy-saving graphite cathode specifically comprises the following operations:
s1, hot packing: putting the materials to be wrapped in the heat-packing device which is insulated at the temperature of 450-; the adhesive is one or more of petroleum asphalt, coal asphalt, furfural resin, furan resin or epoxy resin, and the hot pack is one of a vertical hot pack kettle, a horizontal hot pack kettle, a roller furnace and a rotary furnace;
s2, pre-carbonization: directly and continuously conveying the materials subjected to hot ladle treatment into a rotary furnace at high temperature, continuously moving the materials in the rotary furnace forwards along with the rotation of the rotary furnace, and then heating, preserving heat and cooling, wherein the rotating speed of the rotary furnace is 1-10 r/min, the heating rate is 1-10 r/min, the final temperature is 1000-;
s3, graphitization treatment: performing graphitization high-temperature treatment at 2700 ℃ < 3200 ℃ for 48 hours, wherein the graphitization treatment is performed in a graphitization processing furnace;
s4, performing finished product treatment, wherein the finished product treatment process comprises the following steps in sequence: screening, demagnetizing, screening and packaging.
Examples
(1) Hot packaging: putting the materials to be thermally wrapped into a vertical thermal wrapping kettle which is insulated at 550 ℃, and then heating according to a corresponding thermal wrapping curve, wherein the final temperature is 650 ℃.
(2) Pre-carbonization: and (3) directly and continuously conveying the hot-packaged material into the rotary furnace at high temperature, continuously moving the material forwards in the rotary furnace along with the rotation of the rotary furnace, and then heating, preserving heat and cooling. Wherein the rotating speed of the rotary furnace is 5 r/min, the heating rate is 3 ℃/min, the final temperature is 1100 ℃, the heat preservation time is 4 hours, and the pre-carbonization productivity is 15 tons/day. (ii) a
(3) Graphitization: graphitizing at 2800 deg.C for 48 hr
(4) And (3) finished product treatment procedure: sieving, demagnetizing, sieving and packaging
Example 2
(1) Hot packaging: putting the materials to be heated into a rotary furnace which is kept at 500 ℃, and then heating according to a corresponding heat pack curve, wherein the final temperature is 600 ℃.
(2) Pre-carbonization: and (3) directly and continuously conveying the hot-packaged material into the rotary furnace at high temperature, continuously moving the material forwards in the rotary furnace along with the rotation of the rotary furnace, and then heating, preserving heat and cooling. Wherein the rotating speed of the rotary furnace is 3 r/min, the heating rate is 5 ℃/min, the final temperature is 1150 ℃, the heat preservation time is 3.5 hours, and the pre-carbonization capacity is 24 tons/day;
(3) graphitization: graphitizing at 2900 ℃ for 48 hours;
(4) and (3) finished product treatment procedure: screening, demagnetizing, screening and packaging;
as can be seen from the above examples, compared with the conventional hot ladle-cooling-roller kiln/pushed slab kiln pre-carbonization process, the process saves the energy consumption for cooling and heating the high-temperature hot ladle material, and the capacity and efficiency of the rotary furnace are obviously higher than those of the roller kiln/pushed slab kiln (the capacity of the common roller kiln/pushed slab kiln is 4-6 tons/day).
In conclusion, the preparation method of the high-efficiency energy-saving graphite cathode can directly put high-temperature hot-coated materials into the rotary furnace for pre-carbonization treatment, saves the energy consumption of cooling and reheating the hot-coated materials, and has obvious advantages in productivity, efficiency and energy consumption compared with the traditional pushed slab kiln/roller kiln because the rotary furnace is in continuous operation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A preparation method of a high-efficiency energy-saving graphite cathode is characterized by comprising the following steps: the specific operation is as follows:
s1, hot packing: putting the materials to be wrapped in the heat-packing device which is insulated at the temperature of 450-; the adhesive is one or more of petroleum asphalt, coal asphalt, furfural resin, furan resin or epoxy resin, and the hot pack is one of a vertical hot pack kettle, a horizontal hot pack kettle, a roller furnace and a rotary furnace;
s2, pre-carbonization: directly and continuously conveying the materials subjected to hot ladle treatment into a rotary furnace at high temperature, continuously moving the materials in the rotary furnace forwards along with the rotation of the rotary furnace, and then heating, preserving heat and cooling, wherein the rotating speed of the rotary furnace is 1-10 r/min, the heating rate is 1-10 r/min, the final temperature is 1000-;
s3, graphitization treatment: performing graphitization high-temperature treatment at 2700 ℃ < 3200 ℃ for 48 hours, wherein the graphitization treatment is performed in a graphitization processing furnace;
s4, performing finished product treatment, wherein the finished product treatment process comprises the following steps in sequence: screening, demagnetizing, screening and packaging.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101740A (en) * | 1989-12-22 | 1992-04-07 | Entreprise Generale De Chauffage Industriel Pillard | Methods, apparatuses and rotary furnaces for continuously manufacturing caerbon-rich charcoal |
| CN101892531A (en) * | 2010-07-29 | 2010-11-24 | 上海联川自动化科技有限公司 | Carbonization process for carbon fiber filaments and pre-heating device therefor |
| CN103508433A (en) * | 2012-06-20 | 2014-01-15 | 扬州八方机电设备有限公司 | Composite carbon material high-temperature calciner |
| CN107804843A (en) * | 2017-11-20 | 2018-03-16 | 苏州世华新材料科技有限公司 | A kind of preparation technology of uniformly high heat conduction graphite film coiled material |
| CN111584866A (en) * | 2020-05-27 | 2020-08-25 | 安徽科达新材料有限公司 | Preparation method of high-rate artificial graphite negative electrode material |
| CN112678813A (en) * | 2020-12-24 | 2021-04-20 | 上海杉杉科技有限公司 | Pre-carbonization method of lithium battery negative electrode material |
-
2021
- 2021-11-22 CN CN202111385587.9A patent/CN114068880A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101740A (en) * | 1989-12-22 | 1992-04-07 | Entreprise Generale De Chauffage Industriel Pillard | Methods, apparatuses and rotary furnaces for continuously manufacturing caerbon-rich charcoal |
| CN101892531A (en) * | 2010-07-29 | 2010-11-24 | 上海联川自动化科技有限公司 | Carbonization process for carbon fiber filaments and pre-heating device therefor |
| CN103508433A (en) * | 2012-06-20 | 2014-01-15 | 扬州八方机电设备有限公司 | Composite carbon material high-temperature calciner |
| CN107804843A (en) * | 2017-11-20 | 2018-03-16 | 苏州世华新材料科技有限公司 | A kind of preparation technology of uniformly high heat conduction graphite film coiled material |
| CN111584866A (en) * | 2020-05-27 | 2020-08-25 | 安徽科达新材料有限公司 | Preparation method of high-rate artificial graphite negative electrode material |
| CN112678813A (en) * | 2020-12-24 | 2021-04-20 | 上海杉杉科技有限公司 | Pre-carbonization method of lithium battery negative electrode material |
Non-Patent Citations (1)
| Title |
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| 张长森: "《粉体技术及设备》", 31 January 2007 * |
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Application publication date: 20220218 |