A positive electrode material of an ultrahigh-power pulse energy storage device and a preparation method thereof
By combining nanoscale and microscale transition metal lithium-ion oxides with electrostatic spraying technology, the problem of insufficient high-power pulse performance of lithium-ion batteries under high energy density has been solved, achieving high-rate pulse discharge and improved cycle performance, which is suitable for new energy vehicles and aerospace power supplies.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUIZHOU MEILING POWER SUPPLY CO LTD
- Filing Date
- 2024-09-25
- Publication Date
- 2026-06-09
Smart Images
Figure CN119050327B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of novel energy storage device technology, specifically to a positive electrode material for an ultra-high power pulsed energy storage device and its preparation method. Background Technology
[0002] In recent years, with advancements in battery technology and manufacturing processes, the performance indicators of secondary energy storage batteries, such as lithium-ion batteries, have continuously improved, leading to their increasingly widespread application across various fields. From new energy power batteries to specialized equipment in aerospace and other applications, these scenarios place higher demands on the power, energy density, and cycle life of pulse power supplies. Therefore, the development of high-performance energy storage devices capable of high-power pulse discharge is both necessary and urgent.
[0003] This application describes the preparation of a lithium cobalt oxide cathode material with a mixture of nano- and micron-sized particles, which is then used as the anode material in conjunction with commercially available hard carbon materials. This process enables the fabrication of an energy storage device with excellent high-rate pulse and high-rate cycling performance, while also possessing a certain energy density. This meets the demand for high-power pulse power supplies in fields such as new energy vehicles. Summary of the Invention
[0004] The present invention aims to provide an ultra-high power pulsed energy storage device and its preparation method. By utilizing the capacitive energy storage properties of nanoscale cathode materials and the battery-type energy storage properties of micron-scale cathode materials, the high-power pulse performance (1s pulse rate ≥100C) of the energy storage device is greatly improved while ensuring that the battery has a certain energy density (>80Wh / kg).
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A method for preparing a positive electrode material for an ultra-high power pulsed energy storage device includes the following steps:
[0007] S1. Micron-sized and nano-sized transition metal lithium-intercalated oxides are placed in a high-energy ball mill at a mass ratio of 70-95:5-30, and an appropriate amount of solvent is added to form a slurry. The high-energy ball mill is run at a speed of 200-400 r / min for 2-6 h to obtain a mixed cathode material of transition metal lithium-intercalated oxides with mixed micron-sized and nano-sized particles.
[0008] S2. After thoroughly mixing the prepared mixed cathode material, conductive agent and binder, add organic solvent, mix again to form a spraying slurry, and then uniformly spray the slurry onto the substrate surface by electrostatic spraying. After drying, the electrostatic sprayed mixed cathode material is obtained.
[0009] Working principle and beneficial effects of the present invention:
[0010] By uniformly mixing transition metal lithium-intercalated oxide nano- and micro-sized particles, and utilizing the capacitance characteristics of nano-sized particles and the battery characteristics of micro-sized particles, the pulse discharge performance of the energy storage device is greatly improved under the premise of high energy density. This allows for the fabrication of a novel ultra-high power pulsed energy storage device suitable for fields such as new energy vehicle power batteries and aerospace power supplies.
[0011] Because transition metal lithium-ion oxides with micron and nanometer particle sizes are small, conventional mixing methods, such as planetary mixers or ultrasonic dispersion, can lead to stratification due to the different material densities of the two particle sizes, resulting in uneven mixing. However, this application uses small-diameter, medium-diameter, and large-diameter balls for low-speed, short-time ball milling, which avoids stratification and achieves more uniform mixing. This results in more uniform coating on the substrate surface and improves the high-rate pulse and high-rate cycle capabilities of the cathode material.
[0012] Optimized, the transition metal lithium-intercalated oxide includes LiCoO2, LiMn2O4, LiFePO4, and LiNi. 1～x～ y Co y Mn x O2 (NCM ternary material), LiNi 1～x～y Co y Al x O2 (NCA ternary material), LiM x Mn 2～x O4 (M is Fe and Co doped atoms) is the positive electrode material for lithium-ion batteries.
[0013] Optimally, the mass percentage of nano-sized particles in the mixture is 5% to 30%.
[0014] The optimized ratio of stainless steel balls to the material being milled in the high-energy ball mill is 3 to 5:1.
[0015] The optimized ratio of the small-diameter, medium-diameter, and large-diameter stainless steel balls is 4-5:3-4:2, and the diameters of the large, medium, and small balls are 20mm, 10mm, and 5mm, respectively.
[0016] In the optimized process, the mixed cathode material obtained by ball milling in S1 is placed in a vacuum oven and dried at a temperature of 60℃~80℃ for 12~24h.
[0017] In the optimized version, after the single-sided coating of the substrate surface is completed during the S2 electrostatic spraying, it is dried, and the other side of the substrate surface is treated in the same way.
[0018] The optimized method uses CNTs and SP as conductive agents, PVDF as binder, and the mass ratio of the mixed cathode material to CNTs, SP, and PVDF is 85–92.5:2.5–5:2.5–5:2.5–5; the organic solvent is N-methylpyrrolidone.
[0019] The optimized method involves injecting the spray slurry into the spray gun of the electrostatic spraying equipment, adjusting the spraying distance to 5-20cm, the spraying speed to 1cm / s-3cm / s, setting the electrostatic spraying voltage to 10-20kV, and the ambient temperature to 25℃. The slurry is then evenly sprayed onto the substrate surface to a thickness of 15-35μm.
[0020] A cathode material obtained by a method for preparing cathode material for an ultra-high power pulsed energy storage device. Attached Figure Description
[0021] Figure 1 This is a SEM image of the electrode sheet in Embodiment 1 of the present invention;
[0022] Figure 2 This is a SEM image of the electrode sheet in Embodiment 2 of the present invention;
[0023] Figure 3 for Figure 3 SEM image of the electrode in Comparative Example 1 of this invention;
[0024] Figure 4 Here are SEM images of the two electrodes used in Comparative Example 2 of this invention;
[0025] Figure 5 The 1C discharge curves of the electrode-assembled batteries of Examples 1, 2 and Comparative Examples 1, 2, 3, 4 and 5 of the present invention are shown.
[0026] Figure 6 The 100C pulse discharge curves of the electrode-assembled batteries of Examples 1, 2, 1, 2, 3, 4, and 5 of this invention are shown.
[0027] Figure 7 The 500C pulse discharge curves of the electrode-assembled batteries of Examples 1, 2, 1, 2, 3, 4, and 5 of this invention are shown.
[0028] Figure 8 The figures show the 10C charge / 20C discharge cycle curves of the electrode-assembled batteries of Examples 1, 2, 1, 2, 3, 4, and 5 of this invention. Detailed Implementation
[0029] The following detailed description illustrates the specific implementation method:
[0030] Example 1
[0031] (1) Preparation of nano- and micro-particle lithium cobalt oxide cathode materials
[0032] Weigh out 10g of lithium cobalt oxide material with a particle size of 100nm and 90g of material with a particle size of D. 50 Lithium cobalt oxide (LiCoO2) material with a diameter of 5 μm was placed in a ball milling jar with stainless steel balls. The mass ratio of stainless steel balls to the material being milled was 3:1, and the mass ratio of small-diameter, medium-diameter, and large-diameter stainless steel balls was 4:4:2.
[0033] An appropriate amount of anhydrous ethanol was added to the ball mill jar to form a suitable slurry. The ball mill jar was then placed in a high-energy ball mill and milled at 400 r / min for 4 h. The milled material was then placed in a vacuum oven and dried at 80 °C for 24 h to remove residual solvent, resulting in a mixed lithium cobalt oxide cathode material with nano- and micron-sized particles.
[0034] (2) Preparation of electrostatically sprayed nano-particle lithium cobalt oxide positive electrode
[0035] The prepared nano-micro particle lithium cobalt oxide mixed cathode material, conductive agent (CNTs, SP), and binder (PVDF) were placed in a mixing tank at a mass ratio of 92.5:2.5:2.5:2.5. After being thoroughly stirred, the organic solvent N-methylpyrrolidone (NMP) was added. The mass ratio of active material to NMP was 1:1.3. After stirring evenly, a spraying slurry was prepared.
[0036] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0037] After single-sided spraying, the electrode is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained. SEM images of the coated electrode are shown below. Figure 1 As shown.
[0038] Example 2
[0039] (1) Nanoparticles LiN 0.5 Co 0.2 Mn 0.3 Preparation of O2 cathode material
[0040] Weigh 30g of LiN with a particle size of 100nm. 0.5 Co 0.2 Mn 0.3 O2 material, 70g particle size D50 =2μm LiN 0.5 Co 0.2 Mn 0.3 O2 material is placed in a ball mill jar containing stainless steel balls, wherein the mass ratio of stainless steel balls to the material being milled is 4:1, and the mass ratio of small-diameter, medium-diameter, and large-diameter stainless steel balls is 5:3:2.
[0041] Add an appropriate amount of water or anhydrous ethanol to the ball mill jar to form a suitable slurry. Then place the ball mill jar in a high-energy ball mill and ball mill at 400 r / min for 4 h. Place the ball-milled material in a vacuum oven and dry it at 80 °C for 24 h to remove residual solvent, thus obtaining a mixed lithium cobalt oxide cathode material with a mixture of nano-sized and micro-sized particles.
[0042] (2) Preparation of electrostatically sprayed nano-particle lithium cobalt oxide positive electrode
[0043] The prepared nano-micro particle lithium cobalt oxide mixed cathode material, conductive agent (CNTs, SP), and binder (PVDF) were placed in a mixing tank at a mass ratio of 90:3:3:4. After being thoroughly stirred, the organic solvent N-methylpyrrolidone (NMP) was added. The mass ratio of active material to NMP was 1:1.4. After stirring evenly, a spraying slurry was prepared.
[0044] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0045] After single-sided spraying, the electrode is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained. SEM images of the coated electrode are shown below. Figure 2 As shown.
[0046] Comparative Example 1
[0047] Micron-sized lithium cobalt oxide particles (particle size D) 50 =7μm) positive electrode material, conductive agent (CNTs, SP), binder (PVDF) are placed in a mixing tank at a mass ratio of 92.5:2.5:2.5:2.5. After being thoroughly mixed, organic solvent N-methylpyrrolidone (NMP) is added. The mass ratio of active material to NMP is 1:1.2. After being mixed evenly, a spraying slurry is prepared.
[0048] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0049] After single-sided spraying, the electrode is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained. SEM images of the coated electrode are shown below. Figure 3 As shown.
[0050] Comparative Example 2
[0051] (1) Nanoparticles LiN 0.8 Co 0.1 Mn 0.1 Preparation of O2 cathode material
[0052] Weigh out 55g of LiN with a particle size of 100nm. 0.8 Co 0.8 Mn 0.1 O2 material, 45g of LiN with a particle size of 7 micrometers 0.8 Co 0.8 Mn 0.1 O2 material is placed in a ball mill jar containing stainless steel balls, wherein the mass ratio of stainless steel balls to the material being milled is 3:1, and the mass ratio of small-diameter, medium-diameter, and large-diameter stainless steel balls is 4:4:2.
[0053] Add an appropriate amount of water or anhydrous ethanol to the ball mill jar to form a suitable slurry. Then place the ball mill jar in a high-energy ball mill and ball mill at 500 r / min for 3 h. Place the ball-milled material in a vacuum oven and dry at 80 °C for 12-24 h to remove residual solvent, obtaining a LiN mixture with nano- and micron-sized particles. 0.8 Co 0.1 Mn 0.1 O2 mixed cathode material.
[0054] (2) Electrostatic spraying of LiN nanoparticles 0.8 Co 0.1 Mn 0.1 Preparation of O2 positive electrode
[0055] Prepared nano-particles LiN 0.8 Co 0.1 Mn 0.1O2 is mixed with positive electrode material, conductive agent (CNTs, SP), and binder (PVDF) in a mixing tank at a mass ratio of 85:5:5:5. After thorough mixing, organic solvent N-methylpyrrolidone (NMP) is added. The mass ratio of active material to NMP is 1:1.5. After thorough mixing, a spraying slurry is prepared.
[0056] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0057] After single-sided spraying, the electrode is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained. SEM images of the coated electrode are shown below. Figure 4 As shown.
[0058] In Examples 1, 2 and Comparative Example 2 above, the diameters of the large ball, medium ball and small ball are 20 mm, 10 mm and 5 mm, respectively.
[0059] Comparative Example 3: The ball milling step was omitted from Example 1.
[0060] Weigh out 10g of lithium cobalt oxide material with a particle size of 100nm and 90g of material with a particle size of D. 50 Lithium cobalt oxide (LiCoO2) material with a diameter of 5 μm was used as the positive electrode active material. The positive electrode active material, conductive agent (CNTs, SP), and binder (PVDF) were placed in a mixing tank at a mass ratio of 92.5:2.5:2.5:2.5. After thorough mixing, the organic solvent N-methylpyrrolidone (NMP) was added. The mass ratio of active material to NMP was 1:1.3. After thorough mixing, a spraying slurry was prepared.
[0061] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0062] After single-sided spraying, the coating is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained.
[0063] Comparative Example 4 was mixed in a different manner compared to Example 1.
[0064] (1) Preparation of nano- and micro-particle lithium cobalt oxide cathode materials
[0065] Weigh out 10g of lithium cobalt oxide material with a particle size of 100nm and 90g of material with a particle size of D. 50 Lithium cobalt oxide (LiCoO2) material with a particle size of 5 μm was placed in a planetary mixer and stirred at a speed of 90 r / min for 2 h to obtain a nano-micro particle lithium cobalt oxide mixed cathode material.
[0066] (2) Preparation of electrostatically sprayed nano-particle lithium cobalt oxide positive electrode
[0067] The prepared nano-micro particle lithium cobalt oxide mixed cathode material, conductive agent (CNTs, SP), and binder (PVDF) were placed in a mixing tank at a mass ratio of 92.5:2.5:2.5:2.5. After being thoroughly stirred, the organic solvent N-methylpyrrolidone (NMP) was added. The mass ratio of active material to NMP was 1:1.3. After stirring evenly, a spraying slurry was prepared.
[0068] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0069] After single-sided spraying, the coating is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained.
[0070] Comparative Example 5 is based on Example 1, but without the addition of micron-sized lithium cobalt oxide.
[0071] 100g of lithium cobalt oxide material with a particle size of 100nm was weighed as the positive electrode active material. The positive electrode active material, conductive agent (CNTs, SP), and binder (PVDF) were placed in a mixing tank at a mass ratio of 92.5:2.5:2.5:2.5. After thorough mixing, the organic solvent N-methylpyrrolidone (NMP) was added. The mass ratio of active material to NMP was 1:1.3. After thorough mixing, a spraying slurry was prepared.
[0072] Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 10cm, the spraying speed to 2cm / s, set the electrostatic spraying voltage to 12kV, and the ambient temperature to 25℃. Spray the slurry evenly onto the aluminum foil surface to a thickness of 20μm.
[0073] After single-sided spraying, the coating is dried in an oven at 80°C, and then the other side is sprayed using the same parameters. Once dried, an electrostatically sprayed nano-particle lithium cobalt oxide positive electrode is obtained.
[0074] Preparation method of negative electrode sheet: Weigh 2.5g of superconducting carbon black, 2.5g of carbon nanotubes, 5.0g of polyvinylidene fluoride (PVDF), and 90g of commercial hard carbon material and add them to a mixer. Stir at a stirring speed of 30-90r / min for 1-2h until the powder is uniformly mixed. Add NMP to the mixer in 4 portions, stirring for 1-1.5h after each addition. Transfer to the coating process to prepare the hard carbon negative electrode sheet.
[0075] The specific implementation process is as follows: Pouch cells were assembled using the positive electrode sheets prepared in Examples 1, 2, and Comparative Examples 1, 2, 3, 4, and 5. The specific process is as follows: The positive and negative electrode sheets were cut to a certain size using a mold, and then stacked using a semi-automatic stacking machine to prepare the battery cell. After welding the tabs, encapsulation, electrolyte injection, and aging, the battery cell underwent formation. Once formation was complete, capacity, pulse performance, and cycle performance were tested. The 1C discharge performance of the pouch cells assembled using the positive electrode sheets prepared in Examples 1, 2, 1, 2, 3, 4, and 5 was tested (discharge current set at 1.0A, voltage range 4.3-2.5V). The discharge curves are attached. Figure 5 As shown, from the appendix Figure 5 It can be seen that the discharge capacity of the positive electrode assembled soft pack batteries prepared in Examples 1, 2 and Comparative Examples 1, 2, 3, 4 and 5 at a 1C rate is about 1.05Ah, the single cell weight is about 45g, and the specific energy is 90Wh / kg.
[0076] The positive electrode sheets prepared in Examples 1, 2, 1, 2, 3, 4, and 5 were tested for 100C pulse discharge of assembled soft-pack batteries (discharge current set at 100A, voltage range 4.3-2.5V, pulse width 1s, interval 2s). The discharge curves are attached. Figure 6 As shown, from the appendix Figure 6 It can be seen that the positive electrode assembled soft-pack batteries prepared in Examples 1 and 2 can withstand 39 and 37 pulse discharges respectively under 100C pulse discharge, with the cutoff voltage greater than the lower discharge limit voltage of 2.5V. In contrast, the positive electrode assembled soft-pack batteries prepared in Comparative Examples 1, 2, 3, 4, and 5 can withstand less than 35 discharges when the discharge voltage is less than 2.5V under 100C pulse discharge. This indicates that the positive electrode assembled soft-pack batteries prepared in Examples 1 and 2 have better 100C pulse discharge performance.
[0077] The positive electrode sheets prepared in Examples 1, 2, and Comparative Examples 1, 2, 3, 4, and 5 were tested for 500C pulse discharge of assembled soft-pack batteries (discharge current set at 500A, voltage range 4.3-2.5V, pulse width 1s, interval 1s). The discharge curves are attached. Figure 7 As shown, from the appendix Figure 7 It can be seen that the positive electrode assembled soft-pack batteries prepared in Examples 1 and 2 can withstand 7 and 6 pulse discharges respectively under 500C pulse discharge, with the cutoff voltage greater than the lower discharge limit voltage of 2.5V. However, the positive electrode assembled soft-pack batteries prepared in Examples 1, 2, 3, 4, and 5 can only withstand a maximum of 5 discharges when the discharge voltage is not less than 2.5V under 500C pulse discharge. This indicates that the positive electrode assembled soft-pack batteries prepared in Examples 1 and 2 have superior 500C pulse discharge performance.
[0078] The positive electrode sheets prepared in Examples 1, 2, 1, 2, 3, 4, and 5 were tested to assemble soft-pack batteries under 10C charge / 20C discharge cycles (charging current set at 10A, discharging current at 20A, voltage range 4.2-2.5V). The capacity retention rates are shown in the attached figure. Figure 8 As shown, from the appendix Figure 8 It can be seen that the positive electrode assembled pouch batteries prepared in Examples 1 and 2 have a capacity retention rate of 80% after more than 2000 cycles of 10C charge / 20C discharge cycles, while the positive electrode assembled pouch batteries prepared in Examples 1, 2, 3, 4, and 5 have a capacity retention rate of 80% after less than 2000 cycles. This indicates that the positive electrode assembled pouch batteries prepared in Examples 1 and 2 have superior 10C charge / 20C discharge cycle performance.
Claims
1. A method for preparing a positive electrode material for an ultra-high power pulsed energy storage device, characterized in that, Includes the following steps: S1. Micron-sized and nano-sized transition metal lithium-intercalated oxides are placed in a high-energy ball mill at a mass ratio of 70~95:5~30, and an appropriate amount of solvent is added to form a slurry. The high-energy ball mill is ball-milled at a speed of 200~400 r / min for 2~6 h to obtain a mixed cathode material of transition metal lithium-intercalated oxides with mixed micron-sized and nano-sized particles. S2. After thoroughly mixing the prepared mixed cathode material, conductive agent and binder, add organic solvent, mix again to form a spraying slurry, and then uniformly spray the slurry onto the substrate surface by electrostatic spraying. After drying, the electrostatic spraying method mixed cathode material is obtained. In the high-energy ball mill, the mass ratio of stainless steel balls to the material being milled is 3~5:1; the mass ratio of small-diameter balls, medium-diameter balls, and large-diameter balls in the stainless steel balls is 4~5:3~4:2, and the diameters of the large balls, medium balls, and small balls are 20mm, 10mm, and 5mm, respectively.
2. The method for preparing the positive electrode material of the ultra-high power pulsed energy storage device according to claim 1, characterized in that, The transition metal lithium intercalation oxide includes LiCoO2, LiMn2O4, LiFePO4, and LiNi. 1～x～y Co y Mn x O2NCM ternary materials, LiNi 1～x～y Co y Al x O2NCA ternary materials, LiM x Mn 2～x O4 and M are positive electrode materials for lithium-ion batteries, which are doped with Fe and Co atoms.
3. The method for preparing the positive electrode material of the ultra-high power pulsed energy storage device according to claim 2, characterized in that, The mass percentage of nano-sized particles in the mixture is 5-30%.
4. The method for preparing the positive electrode material of the ultra-high power pulsed energy storage device according to claim 3, characterized in that, S1 placed the ball-milled mixed cathode material in a vacuum oven and dried it at 60℃~80℃ for 12~24h.
5. The method for preparing the positive electrode material of the ultra-high power pulsed energy storage device according to claim 4, characterized in that, During the S2 electrostatic spraying process, after one side of the substrate surface is sprayed, it is dried, and the other side of the substrate surface is treated in the same way.
6. The method for preparing the positive electrode material of the ultra-high power pulsed energy storage device according to claim 5, characterized in that, The conductive agent is CNTs and SP, the binder is PVDF, and the mass ratio of the mixed positive electrode material and CNTs, SP and PVDF is 85~92.5:2.5~5:2.5~5:2.5~5; the organic solvent is N-methylpyrrolidone.
7. The method for preparing the positive electrode material of the ultra-high power pulsed energy storage device according to claim 6, characterized in that, Inject the spraying slurry into the spray gun of the electrostatic spraying equipment, adjust the spraying distance to 5~20cm, the spraying speed to 1~3cm / s, set the electrostatic spraying voltage to 10~20kV, the ambient temperature to 25℃, and spray the slurry evenly onto the surface of the substrate to a thickness of 15~35μm.
8. The cathode material obtained by the method for preparing cathode material for ultra-high power pulsed energy storage devices according to any one of claims 1 to 7.