CN212024781U - Production device of high-performance negative electrode material - Google Patents
Production device of high-performance negative electrode material Download PDFInfo
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- CN212024781U CN212024781U CN202020174616.1U CN202020174616U CN212024781U CN 212024781 U CN212024781 U CN 212024781U CN 202020174616 U CN202020174616 U CN 202020174616U CN 212024781 U CN212024781 U CN 212024781U
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Abstract
The utility model provides a high performance anode material's apparatus for producing, is including melting jar, modification jar, gas heater, breaker, screening machine, oxidation bed, high temperature carbonization stove, the modification jar is connected to the melting jar, gas heater connects the modification jar, the discharge gate of modification jar is to the breaker pay-off, the breaker is to the screening machine pay-off, and the screening machine is to the oxidation bed pay-off, and high temperature carbonization stove is connected to the oxidation bed discharge gate. Compared with the prior art, the beneficial effects of the utility model are that: the preparation process is simple, the raw material source is wide, and when the prepared cathode material is used as the cathode material of the lithium ion battery, the specific capacity is high, the cycle performance is good, the multiplying power charge-discharge performance is good, the industrialization is easy to realize, and the industrial production is easy to operate.
Description
Technical Field
The utility model belongs to a preparation method and application of hard carbon cathode material, in particular to a production device of high-performance cathode material.
Background
With the increasing exhaustion of fossil fuels and the gradual deterioration of the environment, the development of new energy is more and more important, and lithium ion batteries become ideal power sources of high-end energy storage systems of hybrid vehicles, space technologies and the like due to the excellent characteristics of high energy density, environmental friendliness, diversified structures, low price and the like. The negative electrode materials that have been commercialized in the market are mainly carbon-based materials, including graphitized carbon materials (such as natural graphite, modified graphite, mesocarbon microbeads, etc.) and amorphous carbon (soft carbon, hard carbon). The graphite has a perfect lamellar structure and carbon atoms arranged in a hexagonal mode, lithium ions are inserted into parallel lamellar layers to form an interlayer compound, the platform potential is low, but the charge and discharge performance under high current density is poor, and the dynamic performance is not ideal; the soft carbon has low graphitization degree, large interlayer spacing, good compatibility with a solvent in an electrolyte, low charge-discharge capacity and high price; the stereo cross-linked structure of the hard carbon makes it have higher Li+The lithium ion battery cathode material has the advantages of diffusion coefficient, wider lithium intercalation potential interval, suitability for large-current charge and discharge, long cycle life, high rate performance, high specific capacity, low cost and the like, thereby being considered as the most potential lithium ion battery cathode material in the future.
The CN103011127A patent prepares hard carbon by crushing, curing and carbonizing asphalt with the softening point lower than 280 ℃, and the obtained hard carbon cathode material has high specific surface area, so that the first charge-discharge irreversible capacity is increased, and the charge-discharge efficiency of the electrode material is reduced; the patent CN105645379A provides a method for preparing hard carbon by distilling and separating heavy oil and heavy components from molten asphalt thin films, and the method has the advantages of low product yield, special equipment, complex subsequent treatment process, long process flow and difficult realization of industrial production.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high performance negative pole material's apparatus for producing, production simple process, raw materials sources is extensive, and specific capacity is high, the cyclicity can be good, multiplying power charge-discharge performance is good when the negative pole material who makes is used in lithium ion battery negative pole material, easily realizes industrialization and the easy operation of industrial production.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a high performance anode material's apparatus for producing, is including melting jar, modification jar, gas heater, breaker, screening machine, oxidation bed, high temperature carbonization stove, the modification jar is connected to the melting jar, gas heater connects the modification jar, the discharge gate of modification jar is to the breaker pay-off, the breaker is to the screening machine pay-off, and the screening machine is to the oxidation bed pay-off, and high temperature carbonization stove is connected to the oxidation bed discharge gate.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the prepared cathode material has excellent electrochemical performance and is a high-quality raw material of quick-charging battery equipment;
2) the utility model discloses the product yield of preparation is higher, does not have special requirement to equipment, and does not introduce external cross-linking agent or impurity, and subsequent processing is simple, and process flow is short, and the easy realization of industrialization amplification production.
3) Through the utility model discloses the hard carbon material of preparation is through the test, and its electrical property is good, and retentivity is high after many times charge-discharge cycle, is fit for big multiplying power charge-discharge, is a high-quality energy storage material.
4) The method simplifies the control factors and is easy to operate in industrial production.
Drawings
FIG. 1 is a process flow diagram of the present invention;
in the figure: 1. the method comprises the following steps of (1) hard asphalt raw material, (2) a bucket elevator, (3) a storage bin, (4) a liquid asphalt raw material tank, (5) a melting tank, (6) a gas source, (7) a gas heater, (8) a modification tank, (9) a crusher, (10) a screening machine, (11) an oxidation bed, (12) a high-temperature carbonization furnace and (13) a finished product storage bin.
Detailed Description
The following embodiments are further described in detail:
a production process of a high-performance negative electrode material comprises the following steps of feeding asphalt raw materials into a melting tank for melting, feeding the melted asphalt raw materials into a modification tank for modification, crushing and screening the modified asphalt, treating the crushed and screened asphalt by an oxidation bed, and carbonizing the crushed asphalt raw materials in a high-temperature carbonization furnace to obtain the negative electrode material, wherein the specific process comprises the following steps:
1) pretreatment of raw materials: after coarse crushing and crushing, the hard asphalt enters a storage bin through a bucket elevator, and the asphalt is thrown into a melting tank through a feeder to be melted; directly pumping the liquid asphalt into a melting tank for melting;
2) modification: the melted asphalt is injected into a modification tank, and air or nitrogen is introduced into the modification tank through a gas heater to modify the raw materials;
3) crushing and screening: cooling the modified asphalt to room temperature, crushing by a crusher, controlling the particle size, and screening and grading by a screening machine;
4) oxidation stabilization: oxidizing the classified powder by an oxidation bed;
5) carbonizing: and (4) the oxidized material enters a high-temperature carbonization furnace for carbonization.
The coarse breaking particle size of the hard asphalt is less than 1 cm. The raw material is one or mixture of coal pitch and petroleum pitch.
The temperature of the melting tank in the step 1) is 100-200 ℃, the heating rate is 1-15 ℃/min, and the constant temperature time is 0.5-5 h.
The temperature of the gas heater in the step 2) is 300-450 ℃; the technological parameters of the modification tank are as follows:
reaction temperature: 240-380 ℃;
reaction time: 5-15 h;
stirring speed: 80-300 r/min;
gas quantity: 30-140L/h.
The softening point of the modified asphalt in the step 2) is 280-400 ℃.
The crushing and screening granularity D50 in the step 3) is 10-25 mu m.
The temperature of the oxidation bed in the step 4) is 200-350 ℃, the powder conveying speed is 0.5-3 m/min, and the powder thickness is 1-10 mm.
The carbonization process parameters in the step 5) are as follows:
the heating rate is as follows: the low temperature section is 400-550 ℃ and 5-20 ℃/h; a high temperature section is higher than 550 ℃, and the temperature is 3-5 ℃/min;
final carbonization temperature: 800-2000 ℃;
constant temperature time: the low temperature section is 1-5 h, and the high temperature section is 0.5-5 h.
The obtained negative electrode material has a particle diameter D50 of 5-20 μm and a specific surface area of 2-10 m2The specific capacity is not less than 350mAh/g, and the capacity retention rate is not less than 90 percent after 300 times of circulation.
As shown in fig. 1, the production device of the high-performance anode material comprises a melting tank 5, a modification tank 8, a gas heater 7, a crusher 9, a screening machine 10, an oxidation bed 11 and a high-temperature carbonization furnace 12, wherein the melting tank 5 is connected with the modification tank 8, the gas heater 7 is connected with the modification tank 8, a discharge port of the modification tank 8 feeds materials to the crusher 9, the crusher 9 feeds materials to the screening machine 10, the screening machine 10 feeds materials to the oxidation bed 11, a discharge port of the oxidation bed 11 is connected with the high-temperature carbonization furnace 12, and the discharge of the high-temperature carbonization furnace 12 passes through the screening machine to obtain a finished product material.
The modifying tank 8 adopts a reaction kettle, and the raw materials in the reaction kettle are modified by introducing heated air or nitrogen into the reaction kettle.
The hard asphalt raw material 1 is sent into a storage bin 3 through a bucket elevator 2 and then sent into a melting tank 5 through a screw feeder at the bottom of the storage bin 3.
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples, and the methods used in the following examples are all conventional methods unless otherwise specified.
Example 1:
pumping out the soft asphalt with the softening point of 35 ℃ from a liquid asphalt raw material tank 4, directly feeding the soft asphalt into a melting tank 5 for melting, pumping the soft asphalt into a modification tank 8 after melting, supplying air by an air source 6, heating the soft asphalt by a gas heater 7, feeding the soft asphalt into the modification tank 8 at the air speed of 40L/h and the stirring speed of 200 r/min, raising the temperature to 300 ℃, reacting for 5h, sampling and measuring the softening point of 310 ℃, extracting and cooling; crushing the modified asphalt by a crusher 9, and grading by a sieving machine 10, wherein the powder is 13.4 mu m in a powder test D50; treating the powder by an oxidation bed 11, feeding the treated powder into a high-temperature carbonization furnace 12, heating to 420 ℃ at a speed of 10 ℃/min under the protection of nitrogen, continuously heating to 550 ℃ at a speed of 10 ℃/h, keeping the temperature for 1h, heating to 1300 ℃ at a speed of 5 ℃/min, keeping the temperature for 3h to obtain a negative electrode material, and feeding the negative electrode material into a finished product bin 13 after grading. The specific surface area is measured to be 5.045m2And the specific discharge capacity of the half-cell formed by the lithium battery and the lithium sheet is 436mAh/g, and the cycle retention rate of 300 circles is 91%.
Example 2:
roughly crushing environment-friendly asphalt with a softening point of 110 ℃, conveying the environment-friendly asphalt to a storage bin 3 through a bucket elevator 2, melting the environment-friendly asphalt in a melting tank 5, pumping the environment-friendly asphalt into a modification tank 8 after melting, supplying nitrogen through an air source 6, heating the environment-friendly asphalt by a gas heater 7, then feeding the environment-friendly asphalt into the modification tank 8 at an air speed of 80L/h and a stirring speed of 200 r/min, heating the environment-friendly asphalt to 300 ℃, reacting for 5h, sampling and measuring the softening point of 290 ℃, extracting and cooling; crushing the modified asphalt by a crusher 9, and grading by a sieving machine 10, wherein the powder is 10.4 mu m in a powder test D50; treating the powder by an oxidation bed 11, feeding the treated powder into a high-temperature carbonization furnace 12, heating to 400 ℃ at a speed of 10 ℃/min under the protection of nitrogen, continuously heating to 520 ℃ at a speed of 5 ℃/h, keeping the temperature for 2h, heating to 1450 ℃ at a speed of 5 ℃/min, keeping the temperature for 2h to obtain a negative electrode material, and feeding the negative electrode material into a finished product bin 13 after grading. The specific surface area is measured to be 4.375m2And the specific discharge capacity of the half-cell formed by the lithium battery and the lithium sheet is 470mAh/g, and the cycle retention rate of 300 circles is 92%.
Example 3
Softening point of 155 DEG CConveying the coarse broken hard asphalt to a storage bin 3 through a bucket elevator 2 to enter a melting tank 5 for melting, pumping the coarse broken hard asphalt into a modification tank 8 after melting, supplying air through an air source 6, heating the coarse broken hard asphalt by a gas heater 7, then feeding the coarse broken hard asphalt into the modification tank 8, heating the coarse broken hard asphalt to the modification tank 8 at an air speed of 80L/h and a stirring speed of 200 r/min/4, heating the coarse broken hard asphalt to 300 ℃, reacting for 5 hours, sampling and measuring the softening point of the coarse broken hard asphalt to be; crushing the modified asphalt by a crusher 9, and grading by a sieving machine 10, wherein the powder is 14.3 mu m in a powder test D50; treating the powder by an oxidation bed 11, feeding the treated powder into a high-temperature carbonization furnace 12, heating to 400 ℃ at a speed of 10 ℃/min under the protection of nitrogen, continuing heating to 540 ℃ at a speed of 15 ℃/h, keeping the temperature for 1h, heating to 1750 ℃ at a speed of 5 ℃/min, keeping the temperature for 3h to obtain a negative electrode material, and feeding the negative electrode material into a finished product bin 13 after grading. The specific surface area is measured to be 2.378m2And the specific discharge capacity of the half-cell formed by the lithium battery and the lithium sheet is 420mAh/g, and the cycle retention rate of 300 circles is 92%.
Claims (1)
1. The utility model provides a apparatus for producing of high performance anode material, its characterized in that, includes melting jar, modification jar, gas heater, breaker, screening machine, oxidation bed, high temperature retort, the modification jar is connected to the melting jar, gas heater connects the modification jar, the discharge gate of modification jar is to the breaker pay-off, the breaker is to the screening machine pay-off, and the screening machine is to the oxidation bed pay-off, and the high temperature retort is connected to oxidation bed discharge gate.
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| CN202020174616.1U CN212024781U (en) | 2020-02-17 | 2020-02-17 | Production device of high-performance negative electrode material |
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| CN202020174616.1U CN212024781U (en) | 2020-02-17 | 2020-02-17 | Production device of high-performance negative electrode material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111170300A (en) * | 2020-02-17 | 2020-05-19 | 中钢集团鞍山热能研究院有限公司 | Production process and device of high-performance negative electrode material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111170300A (en) * | 2020-02-17 | 2020-05-19 | 中钢集团鞍山热能研究院有限公司 | Production process and device of high-performance negative electrode material |
| CN111170300B (en) * | 2020-02-17 | 2023-09-12 | 中钢集团鞍山热能研究院有限公司 | Production process and device of high-performance anode material |
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