Preparation method for continuously producing lithium thionyl chloride composite carbon electrode

Abstract

The invention discloses a preparation method of a continuously-produced lithium thionyl chloride composite carbon electrode, and relates to the technical field of battery production, and the preparation method comprises the following steps: pre-pressing acetylene black, uniformly mixing the pre-pressed acetylene black with adhesive micro-powder to form powder, and carrying out three working procedures of mixing, rolling to form a film and rolling to fit the film on the powder at the temperature of 80-200 DEG C in sequence to finish fibration, so as to obtain the lithium thionyl chloride composite carbon electrode. The lithium thionyl chloride composite carbon electrode is obtained. The preparation process is free of a baking procedure, energy is saved, emission is reduced by 50% or above, and the production period is shortened to 1 day from 3 days of wet-process film rolling or 2 days of semi-dry powder net loading; and a first-grade flammable and explosive organic solvent with poor production safety is not needed, so that the safety risk and the production cost are reduced. The growth suitability of the bonding strength of each section of fibration is controlled through process design, the purpose of film combination after film formation is achieved, a thick electrode required by higher capacity can be prepared, and the adverse effects of net separation, floating powder and the like are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and particularly to a preparation method of a composite carbon electrode for a lithium thionyl chloride power battery. Background Art

[0002] At present, there are two preparation methods for lithium thionyl chloride composite carbon electrodes. The first is the traditional wet rolling film method, and the second is the semi-dry powder online preparation method.

[0003] The first method is specifically as follows: After the wet paste material after mixing powders is dried at 150 °C, the paste material is soaked in isopropanol or ethanol and then kneaded into blocks. The blocks are then repeatedly rolled in opposite directions by a rolling mill and cut into thin wet films. After drying, they shrink into dry films and are cut into the required sizes. They are adhered to both sides of the current collector network using an adhesive, and then flattened, heat-plasticized at high temperature, and shaped and cut to form the composite carbon electrode. This preparation method requires multiple drying processes with high energy consumption; the wet film uses a saturated soaking method to absorb a large amount of first-class flammable and explosive organic solvents, which is not friendly to the production environment and is not conducive to safety control. After drying, the wet film has poor consistency in size, film density, and flatness, affecting the consistency of the discharge capacity; multiple cuttings generate more edge materials, resulting in a raw material utilization rate of only 50% - 60%. The defects of this method in continuous production are: 1) It is necessary to repeatedly roll in opposite directions to form a film, which is not conducive to continuous film formation; 2) The paste material is dehydrated by electrothermal blast drying for 23 - 24 h, then hot-soaked in a first-class flammable and explosive organic solvent, repeatedly rolled in opposite directions to form a film sheet, and the film sheet is then dried in a vacuum and solvent recovery system for 10 - 13 h to form a dry film sheet. The dry film sheet is then bonded to the current collector network using an adhesive, sintered at high temperature, and rolled into shape. Therefore, the production cycle of the wet rolling film is as long as 3 days.

[0004] The second method is specifically as follows: The semi-dry and wet material after mixing powders is extruded through a 0.5 - 1.5 mm sieve hole to obtain strip-shaped materials with a length of 1 - 2 cm. Then, through a centrifugal pelletizer, fine pellet materials with a particle size of 0.5 - 1.5 mm are obtained. After drying and pulverizing into fine powder materials, they are uniformly mixed with an aqueous solvent to obtain semi-dry powder materials. The powder materials are then put online and dried, and then passed through a rolling mill to form a composite carbon electrode with the required thickness. This preparation method is not suitable for preparing relatively thick composite carbon electrodes. As the online thickness increases, the surface floating powder will increase, increasing the self-discharge loss. Therefore, the thickness is generally not more than 2 mm. When it exceeds 2 mm, the adhesion between the powder material and the network is insufficient, resulting in powder falling off and exposing the network, making it unqualified. The defects of this method in continuous production are: 1) The fine pellet materials are put into a vacuum dryer for 12 - 16 h; 2) The obtained dried fine pellet materials are pulverized into fine powder materials; the fine powder materials are uniformly mixed with an aqueous solvent to obtain semi-dry powder materials; the semi-dry powder materials are put online and dried in a vacuum for 8 - 10 h and then rolled into shape. Therefore, the production cycle of the semi-dry powder online production is as long as 2 days.

[0005] Both of the above two methods require multiple drying processes in the middle and cannot achieve continuous production of electrodes. Therefore, it is necessary to develop a preparation method for lithium thionyl chloride composite carbon electrodes that is simple in process, solvent-free, highly efficient and safe, and can be continuously produced. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies of the above background technology and provide a preparation method for lithium thionyl chloride composite carbon electrodes that is simple in process, solvent-free, highly efficient and safe, and can be continuously produced, that is, by the method of pre-forming a dry powder film and then sandwiching and combining the films.

[0007] The technical solution of the present invention is as follows: A preparation method for continuously producing lithium thionyl chloride composite carbon electrodes, comprising: Pre-press acetylene black and then mix it evenly with binder micropowder to form a powder material. The powder material is subjected to three processes of mixing, roll-pressing into a film, and roll-pressing and combining the films with the temperature conditions increasing sequentially within the range of 80-200 °C to complete fibrosis, and a lithium thionyl chloride composite carbon electrode is obtained.

[0008] Preferably, the acetylene black is pre-pressed by a rolling mill to a bulk specific gravity of 5-7 ml / g, and the mixing time of the pre-pressed acetylene black and the binder micropowder is 20-40 min.

[0009] Preferably, the binder micropowder is polytetrafluoroethylene PTFE micropowder with an average particle size of 0.5-10 μm, and the mass percentage content of the binder micropowder in the powder material is 3-6%, and the rest is acetylene black.

[0010] Preferably, the mixing process includes: mixing by a mixer at a temperature condition of 80-90 °C until the particle size diameter is 0.1-0.5 mm to achieve initial-stage fibrosis.

[0011] Preferably, the roll-pressing into a film process includes: roll-pressing into a film by a rolling mill at a temperature condition of 120-150 °C to achieve middle-stage fibrosis.

[0012] Preferably, the roll-pressing and combining the films process includes: taking two rolls of films and sandwiching a mesh in the middle, and combining the films by a rolling mill at 180-200 °C to achieve final-stage fibrosis, and a lithium thionyl chloride composite carbon electrode is obtained.

[0013] Preferably, the linear speed range of the rolling rolls in the roll-pressing into a film and sandwiching and combining the films processes is 2-3 m / min.

[0014] Preferably, the temperature conditions of the three processes of mixing, roll-pressing into a film, and sandwiching and combining the films are 80 °C, 120 °C, and 180 °C respectively Preferably, the thickness h of the prepared lithium thionyl chloride composite carbon electrode satisfies 4 mm ≥ h ≥ 1 mm. More preferably, 4 mm ≥ h > 2 mm.

[0015] The present invention also provides a lithium thionyl chloride composite carbon electrode, which is prepared by the preparation method of any of the above continuously produced lithium thionyl chloride composite carbon electrodes.

[0016] The beneficial effects of the present invention are as follows: 1) The absence of a baking process enables the entire production process to be continuous, reducing energy consumption and emissions by more than 50%. Moreover, the production cycle is reduced from 3 days for wet rolling or 2 days for semi-dry powder on the web to 1 day. There is no need to use first-class flammable and explosive organic solvents with poor production safety, reducing safety risks and production costs.

[0017] 2) The utilization rate of raw materials is increased from 60% to 95%. In the wet film-forming process, there are slitting and trimming processes. In wet rolling, there is a reversal. After reaching a certain length, it needs to be slit before reversing (slitting will cause unusable head and tail materials). The film sheet can only reach the required size and film density requirements through multiple rolling. If rolled in a single direction multiple times along the exhibition, the pore structure in the film sheet will be damaged, resulting in rough film sheet appearance and then cracking. Due to non-continuous film formation, only one wet film sheet can be obtained at a time (the wet film will shrink after drying). Trimming is required to ensure that the area of the dried film sheet is larger than the required area. Eventually, the raw material utilization rate is only 60%. However, in the present invention, continuous film formation can be achieved, the film-forming size is stable and can directly meet the required size, there is no waste of slitting and trimming, the yield rate is as high as 100%, and it is energy-saving and environmentally friendly.

[0018] 3) The present invention eliminates the drying equipment and the land for sticking film with a high floor area, and the production land area of the lithium thionyl chloride composite carbon electrode is reduced by 60% - 70%. The labor used in the present invention is reduced by 70 - 80%. Through continuous film formation, the labor for sticking film and wet film formation with a high proportion of labor is eliminated.

[0019] 4) It does not damage the structure of the powder containing the binder, improves the adhesion of the completely fibrillated binder, and controls the growth suitability of the adhesion strength of each section of fibrillation through process design to achieve the purpose of film combination after film formation, solving the problems that the existing lithium thionyl chloride power-type composite carbon electrodes cannot be film-combined and continuously film-combined. Moreover, it can prepare thick electrodes required for higher capacity, without adverse effects on product quality such as web detachment and floating powder.

[0020] 5) By pre-rolling acetylene black to a bulk specific gravity of 5 - 7 ml / g, the volume is reduced. While forming the film, the amount of binder can be reduced. Reducing the amount of binder can reduce impedance and enhance the catalytic effect of acetylene black, improving the load voltage level and high-current capacity.

[0021] 6) The present invention realizes a method for preparing a composite film by pre-filming and then sandwiching the mesh, which solves the problem that dry powder cannot be used to prepare composite carbon electrodes larger than 2 mm. This is because as the thickness of the mesh increases, more powder will float on the surface, which will increase the self-discharge loss; and when the adhesion to the mesh is insufficient, the mesh will fall off, causing an increase in internal resistance, thereby reducing the discharge voltage level and increasing energy internal consumption.

[0022] 7) Although wet film preparation can produce composite carbon electrodes larger than 2 mm, it is not easy to achieve continuous production and requires multiple drying cycles with high energy consumption; multiple cuttings produce a large amount of scraps, resulting in a raw material utilization rate of only 50% to 60%; the wet film absorbs a large amount of first-level flammable and explosive organic solvents by saturated immersion, which is not friendly to the production environment and is not conducive to safety control. After drying, the wet film has poor consistency in size, film density, and flatness, which affects the consistency of the discharge capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the discharge curve of the ER26M lithium primary battery at 700mA constant current discharge to 2V. DETAILED DESCRIPTION

[0024] The following will be clearly and completely described in conjunction with the embodiments of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without paying creative work all belong to the scope of protection of the present invention. If the specific conditions are not specified in the embodiments, they are carried out according to the conditions recommended by the normal conditions or the manufacturers. If the manufacturers are not specified in the reagents or instruments used, they are all conventional products that can be obtained by commercial purchase.

[0025] The present application embodiment provides a method for preparing a lithium thionyl chloride composite carbon electrode for continuous lithium production, comprising: The acetylene black is pre-pressed and mixed evenly with the binder powder to form a powder, and the powder is subjected to three steps of mixing, rolling film forming, and sandwiching film forming at a temperature condition of 80 to 200° C. to complete fiberization, thereby obtaining a lithium thionyl chloride composite carbon electrode.

[0026] In some optional embodiments, acetylene black is pre-pressed to an apparent specific gravity of 5-7 ml / g and then mixed with binder powder for 20-40 minutes to form a powder. The binder powder is polytetrafluoroethylene PTFE powder with an average particle size of 0.5-10 μm, and the binder powder mass percentage in the powder is 3-6%, and the rest is acetylene black.

[0027] In some optional embodiments, the mixing step includes: mixing by a mixer at a temperature of 80-90° C. until the particle size is 0.1-0.5 mm in diameter, thereby achieving initial fiberization.

[0028] In some alternative embodiments, the roll forming process includes: roll forming into a film at a temperature of 120-150°C by a rolling mill, with the linear speed of the rolling rolls ranging from 2 to 3 m / min to achieve mid-section fibrosis.

[0029] In some alternative embodiments, the nip forming process includes: taking two rolls of film with a mesh sandwiched in between, and forming the film at a temperature of 180-200°C by a rolling mill to achieve end-section fibrosis, thereby obtaining a lithium thionyl chloride composite carbon electrode.

[0030] The linear speed of the rolling rolls in the roll forming and nip forming processes ranges from 2 to 3 m / min.

[0031] The thickness h of the lithium thionyl chloride composite carbon electrode obtained above satisfies 4 mm ≥ h ≥ 1 mm, and in some alternative embodiments, 4 mm ≥ h > 2 mm.

[0032] The following further elaborates on the present application in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. Example 1

[0033] This example provides a method for preparing a continuously produced lithium thionyl chloride composite carbon electrode, and the steps are as follows: 1) Acetylene black pretreatment: First, pre-roll the acetylene black until the bulk specific gravity is 5-7 ml / g (specifically 5 ml / g in this example); 2) Mixed powder: Using a mixer, add a binder (polytetrafluoroethylene PTFE fine powder, average particle size 0.5-10 μm) to the acetylene black, and mix evenly for 20-40 min to form a powder. The mass percentage content of the binder fine powder in the powder is 3% (specifically 3% in this example); 3) Initial-stage fibrosis: Heat the mixer to a temperature of 80°C and continue mixing until the particle size diameter is 0.1-0.5 mm; 4) Mid-stage fibrosis film formation: Pre-press the powder particles after initial-stage fibrosis into a thick film by a rolling mill at a temperature of 120°C, and then continuously roll and thin it into a composite carbon electrode film of the required size. The specific linear speed of the rolling rolls is 3 m / min; 5) End-stage fiber combination film formation: Take 2 rolls of composite carbon electrode films, sandwich a mesh in between (the mesh material can generally be a nickel expanded mesh), and form the composite carbon electrode of the required size by film formation using a rolling mill at a temperature of 180°C. The specific linear speed of the rolling rolls is 3 m / min. Example 2

[0034] This example provides a method for preparing a continuously produced lithium thionyl chloride composite carbon electrode, and the steps are as follows: 1) Pretreatment of acetylene black: First, pre-roll the acetylene black until its bulk specific gravity is 5 - 7 ml / g (specifically 7 ml / g in this example); 2) Mixing of powder materials: Using a mixer, add the binder (polytetrafluoroethylene PTFE fine powder, average particle size 0.5 - 10 μm) to the acetylene black and mix evenly for 20 - 40 min to form powder materials. The mass percentage content of the binder fine powder in the powder materials is 6%; 3) Initial stage fibrillation: Heat the mixer to a temperature of 90 °C and continue mixing until the particle size diameter is 0.1 - 0.5 mm; 4) Middle stage fibrillation for film formation: Pre-press the powder particles after the initial stage fibrillation into a thick film through a rolling mill at a temperature of 150 °C, and then continuously roll and thin it into a composite carbon electrode film of the required size. The specific linear speed of the rolling rolls is 2 m / min; 5) Final stage fiber combination and film formation: Take 2 rolls of composite carbon electrode films, sandwich a mesh in the middle (the mesh material can generally be a nickel expanded mesh), and combine the films into a composite carbon electrode of the required size through a rolling mill at a temperature of 200 °C. The specific linear speed of the rolling rolls is 2 m / min. Example 3

[0035] This example provides a preparation method for a continuously produced lithium thionyl chloride composite carbon electrode, and the steps are as follows: 1) Pretreatment of acetylene black: First, pre-roll the acetylene black until its bulk specific gravity is 5 - 7 ml / g (specifically 6 ml / g in this example); 2) Mixing of powder materials: Using a mixer, add the binder (polytetrafluoroethylene PTFE fine powder, average particle size 0.5 - 10 μm) to the acetylene black and mix evenly for 20 - 40 min to form powder materials. The mass percentage content of the binder fine powder in the powder materials is 4.5%; 3) Initial stage fibrillation: Heat the mixer to a temperature of 85 °C and continue mixing until the particle size diameter is 0.1 - 0.5 mm; 4) Middle stage fibrillation for film formation: Pre-press the powder particles after the initial stage fibrillation into a thick film through a rolling mill at a temperature of 135 °C, and then continuously roll and thin it into a composite carbon electrode film of the required size. The specific linear speed of the rolling rolls is 2.5 m / min; 5) Final stage fiber combination and film formation: Take 2 rolls of composite carbon electrode films, sandwich a mesh in the middle (the mesh material can generally be a nickel expanded mesh), and combine the films into a composite carbon electrode of the required size through a rolling mill at a temperature of 190 °C. The specific linear speed of the rolling rolls is 2.5 m / min. Example 4

[0036] This example provides a preparation method for a continuously produced lithium thionyl chloride composite carbon electrode, and the steps are as follows: 1) Pretreatment of acetylene black: First, pre-press the acetylene black until its bulk specific gravity is 5 - 7 ml / g (specifically 5.5 ml / g in this example); 2) Mixing of powder materials: Using a mixer, add the binder (PTFE micropowder, average particle size 0.5 - 10 μm) to the acetylene black and mix evenly for 20 - 40 min to form powder materials. The mass percentage content of the binder micropowder in the powder materials is 3%; 3) Initial stage fibrillation: Heat the mixer to a temperature of 85 °C and continue mixing until the particle size diameter is 0.1 - 0.5 mm; 4) Middle stage fibrillation for film making: Pre-press the powder particles after the initial stage fibrillation into a thick film through a rolling mill at a temperature of 150 °C, and then continuously roll and thin it into a composite carbon electrode film of the required size. The specific linear speed of the rolling mill is 2.5 m / min; 5) Final stage fibrillation and film combination: Take 2 rolls of composite carbon electrode films, sandwich a mesh in the middle (the mesh material can generally be nickel expanded mesh), and combine the films into a composite carbon electrode of the required size through a rolling mill at a temperature of 190 °C. The specific linear speed of the rolling mill is 2.5 m / min.

[0037] Comparative example (wet) This comparative example prepares the carbon positive electrode by the wet method. The steps are as follows: 1) Pretreatment of powder materials: Mix 1000 g of acetylene black, 30 g of absolute ethanol, 60 g of copper powder as the positive electrode conductive agent, 70 g of PTFE emulsion binder, and 7000 g of pure water into a wet material and stir evenly; put the wet material into an electric heating blast drying oven at 150 °C for 23 - 24 h to form a paste material; 2) Wet rolling film: Add alcohol to the obtained paste material and soak it for 10 min, then roll it into a wet film; put the wet film into a vacuum drying oven at 120 °C and dry it for 10 h to form a dry film; 3) Film adhesion: Use the binder to bond the dry film and the current collector net into one body, and put it into an oven at 240 °C for 15 min for sintering; 4) Positive electrode forming: The sintered positive electrode is shaped through a precision rolling mill, and after slitting, the positive electrode cover group is spot-welded to make the positive electrode.

[0038] Comparative example (semi-wet) This comparative example prepares the carbon positive electrode by the semi-wet method. The steps are as follows: 1) Pretreatment of powder materials: Mix 1000 g of acetylene black, 6 g of absolute ethanol, 60 g of copper powder as the positive electrode conductive agent, 70 g of PTFE emulsion binder, and 3000 g of pure water into a wet material and stir evenly; the wet material enters an extrusion machine with a screen hole diameter of 0.5 mm for extrusion to obtain strip-shaped materials with a length of 1 - 2 cm; the strip-shaped materials enter a centrifugal pelletizing machine to obtain fine pellet materials with a particle diameter of 0.5 mm; the fine pellet materials are put into a vacuum drying oven at 100 °C and dried for 12 h; 2) Powder on the mesh: The obtained dried fine pellets are crushed into fine powder with a particle size of 0.1 - 0.2 μm; the powder is uniformly mixed with 50% alcohol aqueous solution in a mass ratio of 1:2.2 to form semi-dry powder; the semi-dry powder is evenly sprinkled on both sides of the nickel mesh through an impeller feeder, and the powder is adhered to the nickel mesh through a rolling mill; the nickel mesh with semi-dry powder on it is placed in a vacuum drying oven at 120°C and dried for 8 h; the positive nickel mesh is placed in an oven at 240°C and kept warm for 15 min for fibrillation; 3) Positive electrode forming: The fibrillated positive nickel mesh is shaped and roll-rolled through a precision rolling mill, and after slitting and cleaning the powder, the positive electrode cover group is spot-welded to form the positive electrode. Performance testing

[0039] The carbon electrodes prepared in Example 1 and the comparative example were assembled into ER26M primary lithium batteries, and performance testing was carried out with the index of constant current discharge at 700 mA to 2V capacity (mAh). The results are shown in Table 1, and the corresponding discharge curves are shown in Figure 1 .

[0040] Table 1 Performance comparison of constant current discharge at 700 mA to 2V capacity (mAh)

[0041] It can be seen from the above table that by using the simplest formula and preparing the carbon electrode through the preparation method of the present invention and assembling it into an ER26M primary lithium battery, its high current capacity is increased by 10% - 15%.

[0042] The carbon electrodes prepared in Example 1 and the comparative example were assembled into ER42M primary lithium batteries, and performance testing was carried out with the index of constant current discharge to 2V capacity (mAh). The results are shown in Tables 2 - 3; the capacity retention rate results of the 90-day storage test at 70°C are shown in Table 4.

[0043] Table 2 Performance comparison of constant current discharge at 400 mA to 2V capacity (mAh)

[0044] It can be seen from Table 2 that compared with the comparative example, the advantages of the carbon electrode prepared by the preparation method of the present invention and assembled into an ER42M primary lithium battery are: in the electrode design with different thicknesses, the capacity value of the present invention is the best; as the electrode thickness increases, a higher capacity value can be obtained.

[0045] Table 3 Performance comparison of constant current discharge at 100 mA to 2V capacity (mAh)

[0046] It can be seen from the data in Table 3 that, compared with the comparative example, the carbon electrode prepared by the preparation method of the present invention is assembled into an ER42M primary lithium battery, and the advantages are as follows: in the electrode design with different thicknesses, the capacity value of the present invention is the best; as the electrode thickness increases, a higher capacity value can be obtained.

[0047] Table 4 Performance comparison of capacity (mAh) during constant current discharge at 100 mA to 2V

[0048] It can be seen from the data in Table 4 that, compared with the comparative example, the carbon electrode prepared by the preparation method of the present invention is assembled into an ER42M primary lithium battery, and the advantages are as follows: after the test of storing at 70 °C for 90 days (equivalent to storing at 23 °C for 10 years), its capacity retention rate is as high as 96%, which is much better than the comparative example.

Claims

1. A preparation method of a lithium thionyl chloride composite carbon electrode for continuous production, characterized in that, Including: Pre-press acetylene black and then mix it evenly with binder micropowder to form a powder. Subject the powder to three processes of mixing, roll-pressing into a film, and sandwiching with a mesh with the temperature increasing successively within the range of 80 - 200 °C to complete fibrillation, thereby obtaining a lithium thionyl chloride composite carbon electrode.

2. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The acetylene black is pre-pressed by a rolling mill to a bulk density of 5 - 7 ml / g, and the mixing time of the pre-pressed acetylene black and the binder micropowder is 20 - 40 min.

3. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The binder micropowder is polytetrafluoroethylene (PTFE) micropowder with an average particle size of 0.5 - 10 μm. The mass percentage content of the binder micropowder in the powder is 3 - 6%, and the rest is acetylene black.

4. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The mixing process includes: mixing by a mixer at a temperature of 80 - 90 °C until the particle size diameter reaches 0.1 - 0.5 mm to achieve initial stage fibrillation.

5. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The roll-pressing into a film process includes: roll-pressing into a film by a rolling mill at a temperature of 120 - 150 °C to achieve middle stage fibrillation.

6. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The sandwiching with a mesh and film combining process includes: taking two rolls of film with a mesh in the middle, and combining the film by a rolling mill at a temperature of 180 - 200 °C to achieve final stage fibrillation, thereby obtaining a lithium thionyl chloride composite carbon electrode.

7. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The linear speed range of the rollers in both the roll-pressing into a film process and the sandwiching with a mesh and film combining process is 2 - 3 m / min.

8. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The temperature conditions of the three processes of mixing, roll-pressing into a film, and sandwiching with a mesh and film combining are 80 °C, 120 °C, and 180 °C respectively.

9. The preparation method of the continuously produced lithium thionyl chloride composite carbon electrode according to claim 1, characterized in that, The thickness h of the prepared lithium thionyl chloride composite carbon electrode satisfies 4 mm ≥ h ≥ 1 mm.

10. A lithium thionyl chloride composite carbon electrode, characterized in that, Prepared by the preparation method of the lithium thionyl chloride composite carbon electrode continuously produced according to any one of claims 1 - 9.

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