A low-resistance dry-method pole piece preparation method based on a hierarchical conductive network structure

Abstract

A low-resistance dry-method pole piece preparation method based on a hierarchical conductive network structure, comprising the following steps: adding zero-dimensional conductive agent, one-dimensional conductive agent and two-dimensional conductive agent into activated carbon in the order of zero dimension to one dimension to two dimension, and performing independent high-speed dry mixing and dispersion after adding each kind of conductive agent; performing constant-temperature negative pressure compaction treatment to obtain multi-element active powder; mixing the multi-element active powder and a high molecular binder to obtain a composite dry powder material; performing negative pressure-nitrogen charging circulation treatment on the composite dry powder material to obtain a pre-preparation mixture; performing constant-temperature roller compaction on the pre-preparation mixture to obtain a dry-method pole piece film; and performing heating on a current collector coated with conductive glue by using a heating device, and then performing pressure compounding of the dry-method pole piece film and the current collector to obtain a dry-method pole piece; the dry-method pole piece preparation method defined in the application effectively optimizes the conductive structure of the pole piece, reduces the internal resistance of the pole piece, and improves the structural stability of the dry-method pole piece and the cycle performance of the device.

Description

Technical Field

[0001] This invention belongs to the field of double-layer supercapacitor electrode material preparation technology, specifically relating to a low internal resistance dry electrode preparation method based on a hierarchical conductive network structure. Background Technology

[0002] Electric double-layer supercapacitors are widely used in industrial instantaneous power compensation and new energy storage due to their fast charging and discharging characteristics and high power density. Compared with traditional wet processes, dry electrode preparation does not require organic solvents and has the advantages of no solvent residue and high active material loading, making it the mainstream development direction for high-performance devices. The internal resistance of the electrode is a key parameter that determines the rate performance and cycle stability of supercapacitors.

[0003] While existing technologies employ multiple conductive fillers, these methods typically involve mixing all fillers at once, neglecting the fundamental differences in geometric morphology and surface chemistry between different conductive agents. Competitive adsorption and steric hindrance effects within the same mixture lead to disordered aggregation of the conductive agents on the surface of the active material, hindering the formation of continuous and efficient electron transport channels at the microscale. Furthermore, current dry processes often only involve static drying or a single negative pressure treatment of the binder mixture, resulting in insufficient binder fibrosis and low interfacial bonding strength between the film and current collector. This makes the film prone to peeling or a sharp increase in contact resistance during long-term cyclic charge-discharge cycles.

[0004] Therefore, existing dry electrode fabrication technologies still have shortcomings in terms of reducing internal resistance, electrode uniformity, and the stability of film interface bonding, making it difficult to meet the mass production requirements of high-power supercapacitors for low internal resistance and high reliability of electrodes; further improvements are urgently needed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing low internal resistance dry electrode sheets based on a hierarchical conductive network structure.

[0006] The present invention adopts the following technical solution: A method for fabricating low-resistance dry electrode sheets based on a hierarchical conductive network structure includes the following steps: Step 1: Zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent are added to activated carbon in the order of zero-dimensional, one-dimensional and then two-dimensional. After each conductive agent is added, an independent dry mixing and dispersion operation is performed so that the conductive agents of each dimension form a stepwise coating and embedding on the surface of activated carbon to obtain a pre-dispersed mixed powder. Then, it is subjected to constant temperature negative pressure compaction treatment to obtain multi-element active powder. Step 2: The obtained multi-element active powder and polymer binder are first put into an oven for drying, and then put into a mixer for heating and mixing evenly to obtain composite dry powder material. Step 3: The prepared composite dry powder material is subjected to multiple rounds of negative pressure-nitrogen purging cycle treatment to obtain the pre-mixed material; Step 4: Add the obtained pre-mixed material to a roller press for rolling processing to obtain dry electrode film; Step 5: Heat the current collector pre-coated with conductive adhesive using a heating device, and then pressurize and composite the current collector pre-coated with conductive adhesive with the dry electrode film to obtain the low internal resistance dry electrode.

[0007] Furthermore, in step two, the mass ratio of the activated carbon, polymer binder, and conductive agent raw materials is 85-95:3-8:3-6.

[0008] Furthermore, the mass ratio of the zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent is 10.50-1.50:4.20-4.75:0.25-0.75; the particle size D50 of the zero-dimensional conductive agent is 20-50 mm, the aspect ratio of the one-dimensional conductive agent is 100-1000, and the aspect ratio of the two-dimensional conductive agent is 50-500.

[0009] Furthermore, the zero-dimensional conductive agent is selected from superconducting carbon black, the one-dimensional conductive agent is selected from carbon nanotubes, and the two-dimensional conductive agent is selected from MXene.

[0010] Furthermore, in step three, during the vacuum-nitrogen purging cycle, the negative pressure range is -80kPa to -10kPa, the negative pressure holding time is 200-350s, the nitrogen replenishment pressure range is -5kPa to 0kPa, the nitrogen replenishment holding time is 180-300s, and the cycle number is 10-20 times; and the stirring temperature during the negative pressure process is consistent with the raw material mixing temperature in step two.

[0011] Furthermore, in step one, the stirring frequency of the dry mixing and dispersion operation is 10-20Hz, and the total mixing time is 30-60min.

[0012] Furthermore, in step one, during the constant temperature negative pressure compaction treatment, the negative pressure range is -80kPa to -10kPa, the temperature is 100-180℃, and the drying time is 1-4h.

[0013] Furthermore, in step two, the drying temperature of the oven is 120-130℃, the drying time is 1-2 hours; the temperature of the mixer is controlled at 150-200℃, the stirring frequency is 5-10Hz, and the stirring time is 6-12 hours.

[0014] Furthermore, in step four, the roller pressing pressure is 100-150 Bar, the roller pressing speed is 1-3 m / min, and the roller pressing ambient temperature is 80-120℃.

[0015] Furthermore, the heating device has a heating time of 0.1-5s and a heating temperature controlled at 200-300℃; the composite process is completed in the roller pressing equipment, with a composite roller pressure of 50-80 Bar and a roller pressing transmission speed of 1-3m / min.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are: First, the dry electrode prepared by the present invention has a conductive structure formed by the hierarchical distribution of zero-dimensional conductive agent, one-dimensional conductive agent and two-dimensional conductive agent, which enables the construction of a three-dimensional conductive path inside the electrode, optimizes the electron transport efficiency of the electrode, and significantly reduces the resistivity of the electrode. Second, the present invention uses specific distribution components of zero-dimensional, one-dimensional and then two-dimensional to add conductive agent to activated carbon in sequence, and performs independent dry mixing and dispersion after each addition, so that the conductive agent is uniformly distributed in both the thickness direction and the planar direction of the electrode, and the consistency of electrochemical performance in each region of the electrode is significantly improved. Third, the invention employs a multi-round negative pressure-nitrogen-filled cyclic treatment of the composite dry powder material, causing the binder to form a three-dimensional spatial network skeleton during alternating stretching and backfilling, anchoring the hierarchical conductive network within it; and combined with heating, it achieves pressurized composite bonding between the electrode active material and the current collector, significantly improving the interfacial bonding strength, and maintaining a stable interfacial contact state even after long-term cyclic charging and discharging. Fourth, by using a multi-round negative pressure cyclic fiberization treatment method to replace the traditional single negative pressure treatment process, the binder can be uniformly and fully fibrillated, stretched and cross-linked, constructing a dense and stable powder support skeleton; the pre-dispersed multi-element conductive filler is stably embedded and coated on the surface of the active material particles, effectively stabilizing the three-dimensional conductive network structure inside the electrode, improving the overall structural density and mechanical stability of the electrode, and is fully compatible with the dry solvent-free preparation system, retaining the advantages of the dry process such as low energy consumption, no solvent residue, and high activated carbon loading. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a hierarchical conductive network structure. Detailed Implementation

[0018] The present invention will be further described below through specific embodiments.

[0019] A method for fabricating low-resistance dry electrode sheets based on a hierarchical conductive network structure includes the following steps: Step 1: Zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent are added to activated carbon in the order of zero-dimensional, one-dimensional and then two-dimensional. After each conductive agent is added, an independent dry mixing and dispersion operation is performed so that the conductive agents of each dimension form a stepwise coating and embedding on the surface of activated carbon to obtain a pre-dispersed mixed powder. Then, it is subjected to constant temperature and negative pressure compaction treatment in a constant temperature and negative pressure drying oven to obtain multi-element active powder. Step 2: The obtained multi-element active powder and polymer binder are first put into an oven for drying, and then put into a mixer for heating and mixing evenly to obtain composite dry powder material. Step 3: The prepared composite dry powder material is subjected to multiple rounds of negative pressure-nitrogen purging cycle treatment to obtain the pre-mixed material; Step 4: Add the obtained pre-mixed material to a roller press for rolling processing to obtain dry electrode film; Step 5: Heat the current collector pre-coated with conductive adhesive using a heating device, and then pressurize and composite the current collector pre-coated with conductive adhesive with the dry electrode film to obtain the low internal resistance dry electrode.

[0020] Specifically, in step one, the zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent are conductive materials with zero-dimensional, one-dimensional, and two-dimensional geometric morphologies, respectively. The particle size D50 of the zero-dimensional conductive agent is 20-50 mm, the aspect ratio of the one-dimensional conductive agent is 100-1000, and the aspect ratio of the two-dimensional conductive agent is 50-500. Specifically, the mass ratio of the zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent is 10.50-1.50:4.20-4.75:0.25-0.75. Furthermore, in this application, the zero-dimensional conductive agent is superconducting carbon black, the one-dimensional conductive agent is carbon nanotubes, and the two-dimensional conductive agent is MXene.

[0021] The stirring frequency for dry mixing and dispersion is 10-20 Hz, and the total mixing time is 30-60 min. During constant temperature negative pressure compaction, the negative pressure range is -80 kPa to -10 kPa, the temperature is 100-180 ℃, and the drying time is 1-4 h.

[0022] In step two, the mass ratio of activated carbon, polymer binder, and conductive agent is 85-95:3-8:3-6; and the polymer binder is selected from any one or more compound combinations of polytetrafluoroethylene, polyvinylidene fluoride, polyethylene oxide, polyacrylonitrile, polyvinyl alcohol, and polyacrylic acid. Specifically, the drying temperature of the oven is 120-130℃, and the drying time is 1-2 hours; the temperature of the mixer is controlled at 150-200℃, the stirring frequency is 5-10Hz, and the stirring time is 6-12 hours; the mixer adopts a double planetary mixer.

[0023] In step three, during the vacuum-nitrogen purging cycle, the negative pressure range is -80kPa to -10kPa, the negative pressure holding time is 200-350s, the nitrogen replenishment pressure range is -5kPa to 0kPa, the nitrogen replenishment holding time is 180-300s, and the cycle number is 10-20 times; and the stirring temperature during the negative pressure process is consistent with the raw material mixing temperature in step two.

[0024] In step four, the roller pressing pressure is 100-150 Bar, the roller pressing speed is 1-3 m / min, and the roller pressing ambient temperature is 80-120℃.

[0025] In step five, the heating time of the heating device is 0.1-5 seconds, and the heating temperature is controlled at 200-300℃. The composite process is completed in a roller pressing machine, with a composite roller pressure of 50-80 Bar and a roller pressing transmission speed of 1-3 m / min. The heating device uses a laser heating device, where the laser precisely and rapidly melts the conductive adhesive, thereby bonding the dry electrode film to the current collector. The current collector adopts a single-sided or double-sided conductive adhesive coating structure. Example

[0026] A method for fabricating low-resistance dry electrode sheets based on a hierarchical conductive network structure includes the following steps: Step 1: Weigh 900g of activated carbon powder, 60g of polytetrafluoroethylene binder, and 40g of conductive agent. The zero-dimensional conductive agent is superconducting carbon black, the one-dimensional conductive agent is carbon nanotube, and the two-dimensional conductive agent is MXene. The mass ratio of the zero-dimensional conductive agent, the one-dimensional conductive agent, and the two-dimensional conductive agent is 11.5:4.55:0.5. Step 2: At room temperature, control the stirring frequency of the mixer to 15Hz. First, put the zero-dimensional conductive agent and activated carbon into the dry powder disperser and stir for 15 minutes. After mixing evenly, add the one-dimensional conductive agent and stir for 15 minutes. After mixing evenly again, add the two-dimensional conductive agent and stir for 15 minutes. Finally, mix evenly to obtain the pre-dispersed powder. Step 3: Place the obtained pre-dispersed mixed powder in a constant temperature negative pressure chamber, keep it at a constant temperature of 120℃ throughout the process, set the negative pressure to -80 kPa, and maintain the pressure for 1 hour to obtain multi-element active powder. Step 4: Place the obtained multi-element active powder and polytetrafluoroethylene in an oven and dry at 160°C for 8 hours. Then, put them into a double planetary mixer for heating and stirring to obtain composite dry powder material. The heating temperature of the double planetary mixer is 180°C, the stirring speed is 8 Hz, and the stirring time is 2 hours. Step 5: Place the obtained composite dry powder material in a negative pressure mixing device and stir at a constant temperature of 180℃ throughout the process. Set the negative pressure to -50kPa and hold for 280s, and the nitrogen supplement pressure to -2kPa and hold for 280s. Repeat the operation 15 times. Through periodic negative pressure stretching and nitrogen pressure stabilization, the binder is fully and uniformly fibrillated and cross-linked to form a stable three-dimensional conductive pre-cross-linked skeleton to obtain the pre-mixed material. Step 6: The obtained pre-mixed material is fed into a temperature-controlled roller pressing equipment and continuously rolled at a temperature of 100℃, a pressure of 120 Bar, and a rolling speed of 2 m / min to prepare a dry electrode film with a smooth, dense, and defect-free surface. Step 7: Select a current collector coated with conductive adhesive on both sides, and activate the conductive adhesive on the surface of the current collector by instantaneous heating with a laser at 250℃ for 3 seconds; then, pressurize and composite the dry electrode film with the activated current collector under a pressure of 65 Bar and a speed of 2 m / min to obtain a dry electrode with low internal resistance and high stability. Example

[0027] The preparation method is basically the same as that in Example 1, the main difference being that the mass ratio of zero-dimensional conductive agent, one-dimensional conductive agent and two-dimensional conductive agent is 11.5:4.55:0.75. Example

[0028] The preparation method is basically the same as that in Example 1, the main difference being that the mass ratio of zero-dimensional conductive agent, one-dimensional conductive agent and two-dimensional conductive agent is 11.5:4.55:0.25. Example

[0029] The preparation method is basically the same as that in Example 1, with the main difference being that the first-stage stirring time is 10 min, the second-stage stirring time is 10 min, and the third-stage stirring time is 10 min. Example

[0030] The preparation method is basically the same as that in Example 1, with the main difference being that the first-stage stirring time is 20 min, the second-stage stirring time is 20 min, and the third-stage stirring time is 20 min. Example

[0031] Its preparation method is basically the same as that in Example 1, the main difference is that in step five, the negative pressure cycle is 10 times. Example

[0032] Its preparation method is basically the same as that in Example 1, the main difference is that in step five, the number of negative pressure cycles is 20.

[0033] Comparative Example 1 The preparation method is basically the same as in Example 1, with the main difference being: in step one, only superconducting carbon black is selected as a zero-dimensional conductive agent (without the addition of one-dimensional or two-dimensional conductive agents), and the amount is still 40g; in step two, only primary dispersion is carried out (without secondary or tertiary dispersion), and the dry mixing dispersion time is 45min.

[0034] Comparative Example 2 The preparation method is basically the same as in Example 1, with the main difference being: in step one, two conductive agents, superconducting carbon black (zero-dimensional conductive agent) and carbon nanotubes (one-dimensional conductive agent), are selected (no two-dimensional conductive agent is added). The mass ratio of superconducting carbon black to carbon nanotubes is 11.50:4.55, and the total amount is still 40g. In step two, only primary and secondary dispersion are carried out, and tertiary dispersion is not carried out. Superconducting carbon black is added during primary stirring, carbon nanotubes are added during secondary stirring, and no additional conductive raw materials are added during tertiary stirring.

[0035] Comparative Example 3 The preparation method is basically the same as that in Example 1, the main difference is that: in step one, two conductive raw materials, superconducting carbon black (zero-dimensional conductive agent) and MXene (two-dimensional conductive agent), are used (no one-dimensional conductive agent is added). The mass ratio of superconducting carbon black to MXene is 11.5:0.5, and the total amount is considered to be 40g; in step two, superconducting carbon black is added during the first stirring, MXene is added during the second stirring, and no additional conductive raw material is added during the third stirring.

[0036] Comparative Example 4 The preparation method is basically the same as that in Example 1, the main difference is that: in step one, carbon nanotubes (one-dimensional conductive agent) and MXene (two-dimensional conductive agent) are used (no zero-dimensional conductive agent is added), wherein the mass ratio of carbon nanotubes to MXene is 4.55:0.5, and the total amount is still 40g; in step two, carbon nanotubes are added during the first stirring, MXene is added during the second stirring, and no additional conductive material is added during the third stirring.

[0037] Comparative Example 5 The preparation method is basically the same as that in Example 1. The main difference is that in step one, superconducting carbon black (zero-dimensional conductive agent), carbon nanotubes (one-dimensional conductive agent), MXene (two-dimensional conductive agent) and activated carbon powder are mixed at one time and directly dry-mixed at room temperature and 15Hz frequency for 45 minutes without stepwise addition.

[0038] Comparative Example 6 The preparation method is basically the same as that in Example 1. The main difference is that only a single negative pressure treatment is used in step S5, wherein the negative pressure is -50kPa and the pressure is held for 280s. The total pressure holding time is consistent with the cumulative pressure holding time in Example 1. Multiple rounds of negative pressure extraction and nitrogen filling cycle operations are not performed.

[0039] Comparative Example 7 The preparation method is basically the same as that in Example 1. The main difference is that in step two, the order of adding the conductive agent is adjusted to two-dimensional, zero-dimensional and then one-dimensional. That is, the first-level dispersion is to dry mix activated carbon and MXene for 15 min, the second-level dispersion is to add superconducting carbon black and continue to dry mix for 15 min, and the third-level dispersion is to add carbon nanotubes and continue to dry mix for 15 min.

[0040] Comparative Example 8 The preparation method is basically the same as that in Example 1, with the main difference being: in step one, a single superconducting carbon black conductive agent is used, with a weight of 40g; in step two, all raw materials are directly mixed at once without stepwise addition; in step five, only a single negative pressure treatment is used with a negative pressure of -50kPa and a holding pressure of 280s, without multiple rounds of cyclic operation.

[0041] The differences in preparation methods between Examples 1-7 and Comparative Examples 1-8 are detailed in Table 1.

[0042] Table 1 Comparison of each embodiment and comparative example design

[0043] The dry methods prepared in Examples 1-7 and Comparative Examples 1-8 were tested, and the specific results are shown in Table 2.

[0044] Table 2 Test Data Table

[0045] In summary, as shown in Tables 1 and 2, the supercapacitor electrodes prepared by the dry method of this invention can synergistically optimize resistivity and peel strength by controlling the ratio of conductive agents, the multi-stage dispersion time, and the negative pressure-nitrogen-filled cyclic fiberization process. The performance of each embodiment is significantly better than that of the comparative examples. Comparing Examples 1-3 and Comparative Examples 1-4, it can be seen that compared with single conductive agents or two-component composite systems, Examples 1-3, which use a three-component synergistic composite of zero-dimensional conductive agents, one-dimensional conductive agents, and three-dimensional conductive agents, have significant advantages in electrode resistivity, peel strength, capacity, and cycle retention rate. Furthermore, the ratio of zero-dimensional conductive agents, one-dimensional conductive agents, and two-dimensional conductive agents must be within a specific matching range to form a continuous and efficient conductive network; too high or too low a ratio will affect the continuity and uniformity of the conductive path. Comparing Examples 1, 4, and 5 with Comparative Examples 5 and 7, it can be seen that the process logic and time control of multi-stage dispersion have a significant impact on electrode performance. Adding the conductive materials step by step according to the structural differences can effectively build a continuous and uniform conductive network. Meanwhile, the dispersion time does not continuously optimize the conductive network; on the contrary, it poses a risk of damage to the conductive agent structure, so the dispersion time needs to be reasonably controlled. Comparing Examples 1, 6, and 7 with Comparative Examples 6 and 8, increasing the negative pressure strength and duration can promote the fiberization of polytetrafluoroethylene, enhance the stability of the conductive skeleton and the interfacial bonding force between the active material and the aluminum foil, but excessively high parameters can easily lead to excessive stretching and breakage of the fibrils, so they also need to be controlled within an appropriate range of times.

[0046] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A method for preparing low-resistance dry electrode sheets based on a hierarchical conductive network structure, characterized in that: Includes the following steps: Step 1: Zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent are added to activated carbon in the order of zero-dimensional, one-dimensional and then two-dimensional. After each conductive agent is added, an independent dry mixing and dispersion operation is performed so that the conductive agents of each dimension form a stepwise coating and embedding on the surface of activated carbon to obtain a pre-dispersed mixed powder. Then, it is subjected to constant temperature negative pressure compaction treatment to obtain multi-element active powder. Step 2: The obtained multi-element active powder and polymer binder are first put into an oven for drying, and then put into a mixer for heating and mixing evenly to obtain composite dry powder material. Step 3: The prepared composite dry powder material is subjected to multiple rounds of negative pressure-nitrogen purging cycle treatment to obtain the pre-mixed material; Step 4: Add the obtained pre-mixed material to a roller press for rolling processing to obtain dry electrode film; Step 5: Heat the current collector pre-coated with conductive adhesive using a heating device, and then pressurize and composite the current collector pre-coated with conductive adhesive with the dry electrode film to obtain the low internal resistance dry electrode.

2. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: In step two, the mass ratio of the activated carbon, polymer binder, and conductive agent raw materials is 85-95:3-8:3-6.

3. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: The mass ratio of the zero-dimensional conductive agent, one-dimensional conductive agent, and two-dimensional conductive agent is 10.50-1.50:4.20-4.75:0.25-0.75; the particle size D50 of the zero-dimensional conductive agent is 20-50 mm, the aspect ratio of the one-dimensional conductive agent is 100-1000, and the aspect ratio of the two-dimensional conductive agent is 50-500.

4. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 3, characterized in that: The zero-dimensional conductive agent is selected from superconducting carbon black, the one-dimensional conductive agent is selected from carbon nanotubes, and the two-dimensional conductive agent is selected from MXene.

5. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: In step three, during the vacuum-nitrogen purging cycle, the negative pressure range is -80kPa to -10kPa, the negative pressure holding time is 200-350s, the nitrogen replenishment pressure range is -5kPa to 0kPa, the nitrogen replenishment holding time is 180-300s, and the cycle number is 10-20 times; and the stirring temperature during the negative pressure process is consistent with the raw material mixing temperature in step two.

6. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: In step one, the stirring frequency of the dry mixing and dispersion operation is 10-20Hz, and the total mixing time is 30-60min.

7. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: In step one, during the constant temperature negative pressure compaction treatment, the negative pressure range is -80kPa to -10kPa, the temperature is 100-180℃, and the drying time is 1-4h.

8. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: In step two, the drying temperature of the oven is 120-130℃, and the drying time is 1-2 hours; the temperature of the mixer is controlled at 150-200℃, the stirring frequency is 5-10Hz, and the stirring time is 6-12 hours.

9. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: In step four, the roller pressing pressure is 100-150 Bar, the roller pressing speed is 1-3 m / min, and the roller pressing ambient temperature is 80-120℃.

10. The method for preparing a low-resistance dry electrode based on a hierarchical conductive network structure according to claim 1, characterized in that: The heating time of the heating device is 0.1-5s, and the heating temperature is controlled at 200-300℃; the composite process is completed in the roller pressing equipment, the composite roller pressure is 50-80Bar, and the roller pressing transmission speed is 1-3m / min.

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