CN111477835A - Method for continuously preparing current collector-silicon-carbon negative electrode - Google Patents

Method for continuously preparing current collector-silicon-carbon negative electrode Download PDF

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Publication number
CN111477835A
CN111477835A CN202010338982.0A CN202010338982A CN111477835A CN 111477835 A CN111477835 A CN 111477835A CN 202010338982 A CN202010338982 A CN 202010338982A CN 111477835 A CN111477835 A CN 111477835A
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current collector
silicon
slurry layer
slurry
hot zone
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王志强
陈烨
陈茜
卫英杰
刘长虹
单艾娴
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Sichuan Juchuang Shimoxi Technology Co ltd
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Sichuan Juchuang Shimoxi Technology Co ltd
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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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • 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
    • 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
    • H01M4/362—Composites
    • 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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • 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 relates to a method for continuously preparing a current collector-silicon carbon negative electrode, which comprises the following steps: making the current collector move in a linear type and a single direction; enabling the slurry in the seasoning cabin to flow out of the discharge hole and forming a slurry layer on the surface of the moving current collector; and continuously moving the current collector with the slurry layer to an alternate hot area and a rolling area, evaporating liquid in the slurry layer in the inert gas atmosphere, carbonizing the carbon precursor at high temperature, and controlling the thickness of the slurry layer within a specified range through rolling to obtain the current collector-silicon carbon negative electrode. The invention not only has no extra coating process, but also can realize continuous production and improve the production efficiency.

Description

Method for continuously preparing current collector-silicon-carbon negative electrode
Technical Field
The invention relates to the technical field of preparation of battery silicon-carbon electrode materials, in particular to a method for continuously preparing a current collector-silicon-carbon negative electrode.
Background
The graphitized carbon material is the most commonly used negative electrode material of commercial lithium ion batteries, has good conductivity and stable cycle, but the theoretical specific capacity is only 372mAh/g, which greatly limits the updating and updating of the batteries, and the silicon-based negative electrode material is widely concerned in the industry by the ultrahigh theoretical specific capacity (Si4.4L i:4200mAh/g), so the current collector-silicon carbon negative electrode is mostly prepared by adopting the carbon material and the silicon material at present
109301215A or CN108346523A, the material needs to be coated on a current collector after being prepared, which results in low efficiency; in addition, the conventional preparation method cannot realize continuous preparation, for example, in the scheme disclosed in chinese patent application publication No. CN109301215A, a tube furnace is used to process the sample at high temperature, which determines that the continuous production cannot be realized, further resulting in low production efficiency.
Disclosure of Invention
The invention aims to overcome the defect of low production efficiency in the prior art, and provides a method for continuously preparing a current collector-silicon carbon negative electrode so as to improve the production efficiency of the negative electrode.
Therefore, the invention provides the following technical scheme:
a method for continuously preparing a current collector-silicon carbon negative electrode comprises the following steps:
making the current collector move in a linear type and a single direction;
enabling the slurry in the seasoning cabin to flow out of the discharge hole and forming a slurry layer on the surface of the moving current collector;
and continuously moving the current collector with the slurry layer to an alternate hot area and a rolling area, evaporating liquid in the slurry layer in the inert gas atmosphere, carbonizing the carbon precursor at high temperature, and controlling the thickness of the slurry layer within a specified range through rolling to obtain the current collector-silicon carbon negative electrode.
In the scheme, the current collector moves linearly and unidirectionally, a slurry layer can be formed on the surface of the current collector in the moving process, and liquid evaporation and compaction can be realized in a hot zone and a rolling zone in the continuous moving process, so that the slurry layer becomes compact on the surface of the current collector, and then the current collector-silicon carbon negative electrode is prepared. After one electrode is manufactured, the current collector continuously moves forwards, the next electrode is continuously manufactured, and the manufacturing process is continuous and stable, so that the production efficiency can be greatly improved.
In a further optimized scheme, after the current collector with the slurry layer moves to the alternating hot zone and the rolling zone, under the inert gas atmosphere, the liquid in the slurry layer is evaporated, and the thickness of the slurry layer is controlled within a specified range through rolling, so that the step of obtaining the current collector-silicon carbon negative electrode sequentially comprises:
moving the current collector with the slurry layer on the surface to a first hot zone to finish primary drying treatment, then entering a first roll pressing zone, and preliminarily compacting to remove air holes formed in the slurry layer;
the current collector with the slurry layer on the surface continuously moves to a second hot zone, secondary drying treatment is completed to realize primary carbonization of the carbon source, and then the current collector passes through a second roller pressing zone and is compacted again to remove a pore channel caused by carbon source decomposition gas;
continuously moving the current collector with the slurry layer on the surface to a third hot zone, finishing three times of drying to realize thorough carbonization of a carbon source to obtain a silicon-carbon negative electrode material adhered on the current collector, and compacting again through a third roller pressing zone to obtain a current collector-silicon-carbon negative electrode;
wherein the temperature in the first hot zone, the second hot zone and the third hot zone is increased in sequence.
In the scheme, the processes of heating and rolling are subdivided by arranging three-stage heating and rolling, so that carbon source carbonization can be promoted, a slurry layer is promoted to be more compact, and the slurry layer is contacted with a current collector more closely.
In a further optimized scheme, before the step of enabling the slurry in the seasoning cabin to flow out of the discharge hole, the method further comprises the following steps of: pouring the liquid, the carbon source, the silicon source and the dispersing agent into a container in any order, stirring and crushing to obtain slurry, and then injecting the slurry into a seasoning cabin.
As an implementation mode, the materials can be stirred and crushed in the seasoning cabin, but the discharging speed can be influenced, the subsequent process progress is influenced, and the production efficiency of the negative electrode is influenced finally.
In a further optimized solution, the method further comprises the steps of: the current collector with the slurry layer releases the volatile liquid in the slurry layer through the gas exchange device in the process of the alternating hot zone and the rolling zone, and enables the inert gas to be recycled.
In the above scheme, gas exchange can be realized by arranging the gas exchange device, for example, evaporated liquid during drying is discharged, and inert gas in the reaction bin is recovered to realize secondary utilization, so that gas resources are saved.
The liquid is water or an organic solvent; the carbon source comprises one or more of saccharides, organic high molecular polymers, asphalt and nano coal; the silicon source is nano silicon or silicon monoxide or a mixture of the nano silicon and the silicon monoxide in any proportion; the dispersing agent is one or more of CTAB, PVP, PVA, P123, F127, EBS, GMS and HTG.
Compared with the prior art, the invention can realize continuous production, thereby greatly improving the production efficiency and realizing large-scale mass production. The obtained sample is directly an electrode and can be directly used, and the complicated process of preparing and coating materials in the traditional process is omitted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a production system of the present invention.
FIG. 2 is a flow chart of the preparation method 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Before describing the method of the present invention, the production hardware system upon which the method of the present invention depends will be described.
Referring to fig. 1, the system includes a reaction bin 21 and a seasoning bin 11, the seasoning bin 11 extends into the reaction bin 21, that is, a part of the seasoning bin 11 is inside the reaction bin 21 and a part is outside the reaction bin 21, a rotating device is further disposed in the reaction bin 21, and a current collector 19 is disposed on the rotating device.
The main function of the seasoning tank 11 is to store slurry formed by mixing liquid, carbon source, silicon source and dispersant, and make the slurry flow out from the discharge port, and form a slurry layer (not shown in the figure) on the surface of the moving current collector 19. More specifically, the seasoning tank 11 has a feed port and a discharge port, which are located at the top and bottom of the tank body, respectively. In one scheme, the slurry can be directly prepared in the seasoning cabin 11 by mixing, that is, the liquid, the carbon source, the silicon source and the dispersing agent are put into the seasoning cabin 11 in any order, and then are stirred by a stirring device to obtain the slurry after mixing. In another scheme, the liquid, the carbon source, the silicon source and the dispersing agent may be poured into another container in advance, stirred and mixed to obtain slurry, and then the slurry is injected into the seasoning tank 11 through the feed inlet. The latter scheme is preferred because the continuity of the preparation process in the reaction bin 21 can be ensured after the slurry is prepared in advance, the reaction process in the reaction bin 21 is not affected by the lack of the slurry (the slurry is in the preparation process), and the efficiency is further improved. The stirring device preferably adopts a component with a crushing function so as to crush and refine the carbon source and the silicon source.
The rotating device mainly functions to drive the current collector 19 to move linearly and unidirectionally. More specifically, the rotating means includes a driving motor (not shown in the drawing) and two rotating shafts, which are arranged in parallel, one end of the current collector 19 is wound on one rotating shaft, the other end of the current collector 19 is wound on the other rotating shaft, and the current collector 19 between the two rotating shafts is located in the alternating hot zone and rolling zone. Under the driving of the driving motor, the two rotating shafts rotate synchronously, and then the current collector 19 moves from left to right (only shown in the figure as reference), an unprocessed current collector is wound on the rotating shaft at the left end, and a manufactured current collector-silicon carbon negative electrode is wound on the rotating shaft at the right end.
The main function of the reaction chamber 21 is to provide a hot zone where moisture in the slurry layer attached to the surface of the current collector 19 is evaporated and a rolling zone where the thickness of the slurry layer is controlled within a specified range by rolling, so as to obtain the current collector 19-silicon carbon negative electrode. In the embodiment, in order to improve the electricity storage performance of the electrode, three stages of hot zones and three stages of roll nips are included, and the hot zones and the roll nips are alternately arranged. Specifically, a first hot zone 18, a first rolling zone 12, a second hot zone 17, a second rolling zone 13, a third hot zone 16 and a third rolling zone 14 are arranged from left to right in sequence, heating devices are respectively arranged in the first hot zone 18, the second hot zone 17 and the third hot zone 16, and rolling devices are respectively arranged in the first rolling zone 12, the second rolling zone 13 and the third rolling zone 14. Moving the current collector 19 with the slurry layer on the surface to a first hot zone 18, completing a drying process to evaporate liquid in the slurry layer, then entering a first rolling zone 12, and performing primary compaction to remove air holes formed in the slurry layer; the current collector 19 with the slurry layer on the surface continuously moves to a second hot zone 17, secondary drying treatment is completed to realize primary carbonization of the carbon source, and then the carbon source is compacted again through a second roller pressing zone 13 to remove pore channels caused by carbon source decomposition gas; and then continuously moving the third hot zone 16, completing three times of drying to realize thorough carbonization of the carbon source to obtain a silicon-carbon negative electrode material adhered on the current collector 19, and compacting again through the third roller pressing zone 14 to obtain the current collector-silicon-carbon negative electrode 15. Wherein, the first hot zone 18, the second hot zone 17 and the third hot zone 16 have different functions and different required temperatures, and the temperatures are sequentially increased from the first hot zone 18 to the third hot zone 16, wherein the temperatures are respectively approximately 90-200 ℃, 200-.
The process of preparing the electrode needs to be performed in an inert environment, and therefore, the reaction chamber 21 has another function of providing an inert gas atmosphere, that is, the reaction chamber 21 is filled with inert gas, and then the current collector 19 and the slurry can react in the inert gas atmosphere, so as to prepare the current collector-silicon carbon negative electrode 15. In order to facilitate recycling of the inert gas and discharge of the volatilized liquid (e.g., water), two air exchange ports are disposed on the same side of the reaction chamber 21, a gas exchange device 20 is disposed between the two air exchange ports, and the volatilized liquid (e.g., water) is discharged through an exhaust port 22. The gas exchange device is a common commercial gas separation device, the main principle is to separate by utilizing different gas boiling points, although the energy consumption of the gas exchange device is slightly higher, the inert gas can be recycled, and the cost is more cost-effective than newly purchasing the inert gas.
The method of the present invention is explained based on a specific experimental example.
With continuing reference to fig. 1 and fig. 2, the method for continuously preparing a current collector-silicon carbon negative electrode provided by the present invention comprises the following steps:
step 1, mixing the liquid, the carbon source, the silicon source and the dispersing agent in any order, stirring in any order (30min-48h), carrying out ultrasound (30min-48h), and crushing (30min-48h) to achieve uniform mixing, thereby preparing the slurry. The slurry viscosity (100-3000cp) can also be properly degassed and adjusted.
The process can be completed in the seasoning cabin or can be injected into the seasoning cabin after the completion of the process in other containers, but the process is preferably completed in other containers so as to avoid the influence of the process of mixing the seasoning on the continuity of the production.
The liquid can be water or an organic solvent; the carbon source comprises one or a mixture of a plurality of saccharides, organic high molecular polymers, asphalt and nano coal; the silicon source can be nano silicon or silicon monoxide, or a mixture of the nano silicon and the silicon monoxide in any proportion; the dispersant can be one of CTAB, PVP, PVA, P123, F127, EBS, GMS, HTG or a mixture of more.
Based on one example of the experiment, the liquid was water, the carbon source was industrial sucrose, the silicon source was nanosilicon, the dispersant was a mixture of PVP and P123, in a ratio of 2: 1 and mixing.
And 2, winding the current collector on the rotating device, so that the rotating device drives the current collector to move linearly and unidirectionally when rotating. As shown in fig. 1, one end of the current collector is wound on one rotating shaft, the current collector moves to the right along with the rotation of the rotating shaft, and after the subsequent steps 3-6, the obtained current collector-silicon carbon negative electrode is wound on a second rotating shaft. The current collector can adopt copper foil, aluminum foil, other alloy foils, carbon paper, carbon cloth, carbon felt and other materials which can be used for the current collector.
And 3, injecting the slurry obtained in the step 1 into a seasoning cabin, and enabling the slurry to flow out of a discharge hole at a certain speed and fall onto the surface of a moving current collector to form a slurry layer with a certain thickness. Current collector (copper foil, aluminum foil, other alloy foil, carbon paper, carbon cloth, carbon felt and other materials used for current collector)
And 4, continuously moving the current collector to a first hot zone (at the temperature of 90-200 ℃), slowly moving for 0.5-24 h at a set speed to volatilize liquid in the slurry layer, drying the slurry layer on the surface of the current collector, then entering a first rolling zone, preliminarily compacting by a rolling device, removing air holes formed in the slurry layer, and enhancing the contact between the slurry layer and the current collector.
And 5, continuously moving the current collector into a second hot zone (at the temperature of 200-.
And 6, continuously moving the current collector into a third hot zone (at the temperature of 500-1400 ℃), slowly moving for 0.5-24 h, completely carbonizing the carbon source to obtain a silicon-carbon negative electrode material adhered to the current collector, and further compacting the silicon-carbon negative electrode material by a rolling device in the third rolling zone to obtain the current collector-silicon-carbon negative electrode. The electrode can be directly used for assembling and assembling the battery.
In the above steps 4-6, all the processes are performed under an inert gas atmosphere provided by the reaction chamber, and the inert gas may be argon, nitrogen, hydrogen or a mixture thereof, for example, argon: hydrogen is 9: 1. In the production process of the hot area and the roll nip, the volatile liquid during drying is removed through the gas exchange device, the inert gas atmosphere is kept in the reaction bin all the time, the gas resources can be effectively recycled for the second time, and the cost is saved.
In the method, the current collector 19 is continuously moved in a linear one-way manner through the rotating device, the slurry in the seasoning cabin 11 falls on the surface of the current collector 19 to form a slurry layer in the moving process, and then the current collector is continuously moved in the alternating hot area and rolling area to be dried and rolled, so that the slurry layer is tightly formed on the surface of the current collector 19, and then the current collector-silicon carbon negative electrode 15 is obtained. The whole production process is continuous and compact, so that the production efficiency can be greatly improved, an additional coating process is not needed, the manufacturing process is simplified, and the production efficiency is further accelerated.
The above description is only for the specific embodiments of the present invention, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and should be covered within the protection scope of the present invention.

Claims (6)

1. A method for continuously preparing a current collector-silicon-carbon negative electrode is characterized by comprising the following steps:
making the current collector move in a linear type and a single direction;
enabling the slurry in the seasoning cabin to flow out of the discharge hole and forming a slurry layer on the surface of the moving current collector;
and continuously moving the current collector with the slurry layer to an alternate hot area and a rolling area, evaporating liquid in the slurry layer in the inert gas atmosphere, carbonizing the carbon precursor at high temperature, and controlling the thickness of the slurry layer within a specified range through rolling to obtain the current collector-silicon carbon negative electrode.
2. The method according to claim 1, wherein the step of obtaining the current collector-silicon carbon negative electrode comprises the steps of, after the current collector with the slurry layer moves to the alternating hot zone and rolling zone, evaporating the liquid in the slurry layer under the inert gas atmosphere, and controlling the thickness of the slurry layer within a specified range through rolling, sequentially:
moving the current collector with the slurry layer on the surface to a first hot zone to finish primary drying treatment, then entering a first roll pressing zone, and preliminarily compacting to remove air holes formed in the slurry layer;
the current collector with the slurry layer on the surface continuously moves to a second hot zone, secondary drying treatment is completed to realize primary carbonization of the carbon source, and then the current collector passes through a second roller pressing zone and is compacted again to remove a pore channel caused by carbon source decomposition gas;
continuously moving the current collector with the slurry layer on the surface to a third hot zone, finishing three times of drying to realize thorough carbonization of a carbon source to obtain a silicon-carbon negative electrode material adhered on the current collector, and compacting again through a third roller pressing zone to obtain a current collector-silicon-carbon negative electrode;
wherein the temperature in the first hot zone, the second hot zone and the third hot zone is increased in sequence.
3. The method as claimed in claim 1, wherein the temperature of the first hot zone is 90-200 ℃, the temperature of the second hot zone is 200-500 ℃, and the temperature of the first hot zone is 500-1400 ℃.
4. The method of claim 1, further comprising, prior to the step of flowing the slurry in the brew chamber out of the outlet port, the steps of: pouring the liquid, the carbon source, the silicon source and the dispersing agent into a container in any order, stirring and crushing to obtain slurry, and then injecting the slurry into a seasoning cabin.
5. The method of claim 1, further comprising the step of: the current collector with the slurry layer releases the volatile liquid in the slurry layer through the gas exchange device in the process of the alternating hot zone and the rolling zone, and enables the inert gas to be recycled.
6. The method of claim 1, wherein the liquid is water or an organic solvent; the carbon source comprises one or more of saccharides, organic high molecular polymers, asphalt and nano coal; the silicon source is nano silicon or silicon monoxide or a mixture of the nano silicon and the silicon monoxide in any proportion; the dispersing agent is one or more of CTAB, PVP, PVA, P123, F127, EBS, GMS and HTG.
CN202010338982.0A 2020-04-26 2020-04-26 Method for continuously preparing current collector-silicon-carbon negative electrode Pending CN111477835A (en)

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CN107302080A (en) * 2017-06-21 2017-10-27 天津爱敏特电池材料有限公司 A kind of silica-base film negative material and preparation method thereof
CN107732158A (en) * 2017-09-06 2018-02-23 深圳市比克动力电池有限公司 Lithium ion battery negative electrode preparation method, cathode pole piece and lithium ion battery
CN109659486A (en) * 2018-11-22 2019-04-19 中兴高能技术有限责任公司 Preparation method, cathode and the lithium ion battery of negative electrode of lithium ion battery

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