A method for preparing a stabilized cathode sheet for all-solid-state batteries
By employing a specific temperature and pressure-coordinated interface stabilization heat treatment process, the problems of high interfacial contact impedance and active material breakage in the preparation of all-solid-state battery cathode sheets have been solved, resulting in all-solid-state battery cathode sheets with high density and long cycle life.
Patent Information
- Application Number
- CN202610066831.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-19
- Publication Date
- 2026-05-26
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Abstract
Description
Technical Field
[0001] This invention relates to the field of lithium-ion battery manufacturing technology, specifically to a method for preparing a stabilized positive electrode sheet for all-solid-state batteries. Background Technology
[0002] All-solid-state lithium batteries, by using non-flammable solid electrolytes instead of flammable organic liquid electrolytes, have shown great application potential in terms of safety and energy density. Among them, sulfide solid electrolytes, with their extremely high room-temperature ionic conductivity and suitable mechanical ductility, have become one of the most promising technologies for commercialization. However, all-solid-state batteries rely on solid-solid point contacts for ion transport, and the construction of their electrode interfaces is far more difficult than that of traditional liquid lithium-ion batteries.
[0003] Currently, the mainstream process for preparing sulfide-based all-solid-state battery cathode sheets typically involves mixing and coating the active material, solid electrolyte, and binder, followed by cold isostatic pressing or roll pressing for densification at room temperature. However, this existing process has significant drawbacks. First, because sulfide electrolytes and polymeric binders possess high elastic modulus and yield strength at room temperature, room-temperature physical extrusion alone is insufficient to adequately eliminate micropores within the electrode. This results in insufficient effective contact area between the active material and the electrolyte, leading to high interfacial contact impedance and severely limiting the battery's rate performance.
[0004] To overcome the aforementioned contact problems, existing technologies often resort to applying extremely high mechanical pressure to force the electrodes to densify. While this extreme physical pressure method improves density to some extent, it brings serious side effects: it easily leads to irreversible intergranular cracks or even pulverization within the positive electrode active material. This mechanical damage not only disrupts the electron / ion transport pathways within the particles, but more critically, the fresh crystal faces exposed after particle breakage come into direct contact with the sulfide electrolyte. During high-voltage cycling, this induces severe side reactions and oxidative decomposition of the electrolyte, causing the interfacial impedance to increase sharply with the number of cycles, thereby significantly reducing the cycle life and capacity retention of all-solid-state batteries. Therefore, how to achieve a stable interface construction with low impedance and high density while ensuring the integrity of the electrode structure is a pressing technical challenge in the current field of all-solid-state batteries. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a method for preparing stabilized cathode sheets for all-solid-state batteries. This method solves the problems of existing sulfide all-solid-state battery cathode preparation processes that rely on room temperature cold pressing, which results in high interfacial contact resistance under low pressure, while the ultra-high pressure applied to improve density leads to breakage of active material particles, structural damage, and thus shortened cycle life.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a stabilized positive electrode sheet for all-solid-state batteries, comprising the following steps:
[0007] S1. In an inert atmosphere, the positive electrode active material, sulfide solid electrolyte and binder are dispersed in a non-polar solvent to prepare a positive electrode slurry.
[0008] S2. The positive electrode slurry is coated on the surface of the current collector, and the non-polar solvent is removed by drying to obtain the positive electrode composite material precursor layer.
[0009] S3. Place the positive electrode composite material precursor layer in a hot press and apply pressure and temperature simultaneously for interface stabilization heat treatment.
[0010] S4. Cool the precursor layer of the positive electrode composite material after the interface stabilization heat treatment to obtain the stabilized positive electrode sheet.
[0011] By adopting the above technical solution, the problem of easy breakage of positive electrode particles and high interface contact impedance in the traditional cold pressing process is solved by using an interface treatment process that synergistically couples a specific temperature field and a pressure field.
[0012] The specific innovation mechanism is as follows:
[0013] First, the thermo-rheological and wetting mechanism: Under the influence of applied temperature, the binder distributed inside the electrode softens and enters a viscous flow state. This change in physical state reduces the contact angle of the binder on the surface of the positive electrode active material and sulfide solid electrolyte particles, allowing it to more fully wet the particle surface and fill microscopic voids, thus enabling the construction of a high-strength three-dimensional bonded network with a relatively low binder content.
[0014] Second, the heat-assisted plastic deformation mechanism: Sulfide solid electrolytes have a high Young's modulus, and extremely high pressure is required for densification deformation at room temperature. This invention reduces the yield stress of sulfide electrolytes to undergo plastic deformation by introducing a thermal effect. Under mild pressure conditions, the sulfide electrolyte can soften and deform, tightly coating the positive electrode active material, maximizing the solid-solid contact area.
[0015] Third, stress relief and structural integrity protection: Because the thermal effect assists the densification process, this invention avoids the extreme high pressure applied in traditional processes to achieve density. This effectively prevents the formation of intergranular cracks within the nickel-rich layered oxide secondary particles, maintains the integrity of the cathode material's crystal structure, and reduces the exposure of fresh surfaces and side reactions caused by particle breakage during subsequent cycles.
[0016] Therefore, an all-solid-state battery cathode sheet with tight interfacial contact, low charge transport impedance, high mechanical stripping strength, and structural stability under high voltage cycling was obtained.
[0017] Preferably, in step S3, the process conditions for the interface stabilization heat treatment include: applying a pressure of 10 MPa to 100 MPa and a temperature of 100°C to 250°C.
[0018] By adopting the above technical solution, a precise process window for achieving the aforementioned mechanism was established. When the temperature is controlled between 100℃ and 250℃, it is sufficient to cross the glass transition temperature or softening point of the binder, giving it sufficient fluidity to encapsulate the particles; on the other hand, this upper temperature limit is lower than the starting temperature at which the sulfide solid electrolyte undergoes thermal decomposition or a violent thermochemical reaction with the positive electrode, ensuring the chemical stability of the electrolyte.
[0019] When the pressure is controlled between 10MPa and 100MPa, on the one hand, sufficient driving force is provided to expel the pores inside the electrode layer and achieve physical densification; on the other hand, this pressure range is far below the mechanical breakage threshold of the positive electrode active material, thus avoiding mechanical damage.
[0020] This specific combination of pressure and temperature induces the formation of a physically close and chemically stable interface layer at the interface between the positive electrode active material and the sulfide solid electrolyte. This interface layer serves as both a rapid lithium-ion transport channel and a protective barrier against subsequent high-voltage side reactions.
[0021] Preferably, in step S3, the holding time of the interface stabilization heat treatment is 30 to 60 minutes.
[0022] By adopting the above technical solution, uniform heat conduction along the electrode thickness direction and sufficient relaxation and rearrangement of binder molecular chain segments are ensured. This time span is sufficient to eliminate residual thermal stress inside the electrode, prevent warping or microcracks after cooling, and also take into account the efficiency of industrial production.
[0023] Preferably, in step S1, the dew point temperature of the inert atmosphere is less than or equal to -60°C.
[0024] By employing the above technical solution, the hydrolysis reaction of sulfide solid electrolytes is blocked at its source. Sulfide electrolytes are extremely sensitive to trace amounts of moisture; hydrolysis not only generates toxic hydrogen sulfide gas but also causes an exponential decrease in the ionic conductivity of the material. Strict dew point control ensures the chemical purity and electrochemical activity of the raw materials during the slurry preparation stage.
[0025] Preferably, the process of preparing the positive electrode slurry in step S1 includes: first dissolving the binder in the non-polar solvent to obtain a binder solution, and then adding the positive electrode active material and the sulfide solid electrolyte to the binder solution for mixing and dispersion.
[0026] By employing the above technical solution, molecular-level pre-dispersion of the binder is achieved. Compared to direct dry mixing or simultaneous addition, the pre-dissolution process ensures that the binder solution uniformly coats the surface of each active material and electrolyte particle. During subsequent drying and hot pressing processes, this uniformly distributed binder can more effectively form a continuous conductive and bonding network, avoiding electron / ion transport blockage caused by local binder agglomeration.
[0027] Preferably, in step S4, the positive electrode composite precursor layer is cooled to below 60°C or to room temperature; the cooling process is carried out under pressure while maintaining the interface stabilization heat treatment, or under pressure relief.
[0028] By adopting the above technical solution, the cooling path after heat treatment is standardized, which can not only fix the formation of a dense microstructure by hot pressing, but also effectively control the release of thermal stress caused by the difference in thermal expansion coefficient, ensuring that the final positive electrode sheet has good dimensional stability and flatness.
[0029] This invention provides a method for preparing a stabilized cathode sheet for all-solid-state batteries. It has the following beneficial effects:
[0030] 1. This invention reduces the interfacial impedance of the positive electrode of an all-solid-state battery by employing an interface stabilization heat treatment process that synergistically couples pressure and temperature fields. By utilizing the rheological properties of the binder at a specific temperature and the thermal softening effect of the sulfide solid electrolyte, the electrolyte can undergo plastic deformation with a low yield stress and fully fill the voids between the positive electrode active material particles. This thermally assisted densification mechanism effectively increases the effective contact area of the solid-solid interface, constructs a continuous and low-torsion lithium-ion transport channel, thereby significantly reducing the interfacial contact resistance on the positive electrode side.
[0031] 2. This invention effectively solves the problem of positive electrode active material particle breakage caused by high pressure in traditional cold pressing processes, improving the mechanical stability and cycle life of the electrode. By introducing thermal effects to assist densification, the pressure required for densification is reduced to the range of 10MPa-100MPa, avoiding intergranular cracking and structural damage to nickel-rich layered oxide secondary particles due to ultra-high mechanical stress. It not only maintains the integrity of the crystal structure of the active material, but also reduces side reactions caused by the fresh surface exposed by particle breakage, thereby ensuring the capacity retention rate of the battery during long-term cycling.
[0032] 3. This invention induces a dense interfacial stabilizing layer in situ between the positive electrode active material and the sulfide solid electrolyte through specific hot-pressing process parameters, thereby improving the high-voltage stability of the battery. This interfacial layer plays the role of physical barrier and chemical buffer during charging and discharging, effectively inhibiting the oxidative decomposition of the sulfide electrolyte under high operating voltage and the excessive thickening of the space charge layer, and blocking the continuous generation of high-resistivity interfacial products. This results in an all-solid-state battery with both excellent rate performance and high voltage cycle stability. Detailed Implementation
[0033] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] Examples 1-3:
[0035] Example 1:
[0036] This embodiment provides a method for preparing a stabilized cathode sheet for all-solid-state batteries, specifically including the following steps:
[0037] Preparation of positive electrode slurry:
[0038] The operation shall be carried out in an argon atmosphere glove box (inert atmosphere) with a dew point ≤ -60℃.
[0039] Select nickel-rich layered oxides As the positive electrode active material, sulfide of the silver-germanium type was selected. Hydrogenated nitrile butadiene rubber was selected as the binder for use as a solid electrolyte.
[0040] First, the adhesive H-NBR is dissolved in anhydrous xylene solvent to prepare an adhesive solution.
[0041] Subsequently, each component was weighed according to the mass percentage of positive electrode active material: solid electrolyte: binder = 75:23:2.
[0042] The weighed positive electrode active material powder and solid electrolyte powder are added to a xylene solution containing a binder, and then mixed and dispersed using a planetary mixer. The solid content is adjusted to a suitable viscosity for coating to obtain a uniform positive electrode slurry.
[0043] Forming of positive electrode sheet:
[0044] The prepared positive electrode slurry is uniformly coated onto one surface of an aluminum foil current collector using a coating machine.
[0045] The material was dried under an inert atmosphere to completely remove the xylene solvent, resulting in an untreated cathode composite precursor layer.
[0046] Interface stabilization heat treatment:
[0047] The dried cathode composite precursor layer obtained by molding the cathode sheet is placed in a flat hot press and hot-pressed in an argon atmosphere.
[0048] The heat treatment process parameters are set as follows:
[0049] Applied pressure (P): 30 MPa;
[0050] Heat treatment temperature (T): 180℃;
[0051] Holding time (t): 30 minutes.
[0052] After reaching the set temperature and pressure, maintain the above time to allow the positive electrode active material and the sulfide solid electrolyte to react in situ at the interface and form a stable layer.
[0053] Cooling and removal:
[0054] After heat treatment, the positive electrode sheet is cooled to below 60°C while maintaining pressure or under depressurization, and then removed to obtain an interface-stabilized all-solid-state battery positive electrode sheet.
[0055] Example 2:
[0056] This embodiment provides a method for preparing a stabilized cathode sheet for all-solid-state batteries, specifically including the following steps:
[0057] Preparation of positive electrode slurry:
[0058] The operation shall be carried out in an argon atmosphere glove box (inert atmosphere) with a dew point ≤ -60℃.
[0059] Select layered oxides As the positive electrode active material, sulfide of the silver-germanium type was selected. Hydrogenated nitrile butadiene rubber was selected as the binder for use as a solid electrolyte.
[0060] The binder solution was prepared by dissolving H-NBR in anhydrous xylene solvent.
[0061] Weigh each component according to the mass percentage of positive electrode active material: solid electrolyte: binder = 80:18.5:1.5.
[0062] The weighed positive electrode active material and solid electrolyte are added to the binder solution, and an appropriate amount of anhydrous xylene is added to adjust the solid content. The mixture is then stirred evenly using a planetary mixer to obtain the positive electrode slurry.
[0063] Forming of positive electrode sheet:
[0064] The prepared positive electrode slurry is coated onto an aluminum foil current collector.
[0065] The solvent was removed by heating and drying under an inert atmosphere to obtain the precursor layer of the positive electrode composite material.
[0066] Interface stabilization heat treatment:
[0067] The dried cathode composite precursor layer obtained by molding the cathode sheet is placed in a flat hot press and hot-pressed in an argon atmosphere.
[0068] The heat treatment process parameters are set as follows:
[0069] Applied pressure (P): 10 MPa;
[0070] Heat treatment temperature (T): 250℃;
[0071] Holding time (t): 30 minutes.
[0072] After reaching the set temperature and pressure, maintain the above time. Use the higher temperature to promote the flow of binder and the interfacial reaction, while use the lower pressure to induce the formation of a stable layer at the interface between the positive electrode active material and the sulfide solid electrolyte.
[0073] Cooling and removal:
[0074] After heat treatment, the positive electrode sheet is cooled to room temperature, the pressure is released, and it is taken out to obtain an interface-stabilized all-solid-state battery positive electrode sheet.
[0075] Example 3:
[0076] This embodiment provides a method for preparing a stabilized cathode sheet for all-solid-state batteries, specifically including the following steps:
[0077] Preparation of positive electrode slurry:
[0078] The operation shall be carried out in an argon atmosphere glove box (inert atmosphere) with a dew point ≤ -60℃.
[0079] Select nickel-rich layered oxides As the positive electrode active material, sulfide of the silver-germanium type was selected. Hydrogenated nitrile butadiene rubber was selected as the binder for use as a solid electrolyte.
[0080] The binder solution was prepared by dissolving H-NBR in anhydrous xylene solvent.
[0081] Weigh each component according to the mass percentage of positive electrode active material: solid electrolyte: binder = 70:28:2.
[0082] The weighed positive electrode active material and solid electrolyte are added to the binder solution, xylene solvent is added, and the mixture is thoroughly mixed and dispersed using a planetary mixer to obtain the positive electrode slurry.
[0083] Forming of positive electrode sheet:
[0084] The prepared positive electrode slurry is uniformly coated onto the aluminum foil current collector.
[0085] The solvent was removed by drying under an inert atmosphere to obtain the precursor layer of the positive electrode composite material.
[0086] Interface stabilization heat treatment:
[0087] The dried cathode composite precursor layer obtained by molding the cathode sheet is placed in a flat hot press and hot-pressed in an argon atmosphere.
[0088] The heat treatment process parameters are set as follows:
[0089] Applied pressure (P): 100 MPa;
[0090] Heat treatment temperature (T): 100℃;
[0091] Holding time (t): 60 minutes.
[0092] After reaching the set temperature and pressure, maintain the above time to ensure that a stable layer is effectively formed at the interface between the positive electrode active material and the sulfide solid electrolyte.
[0093] Cooling and removal:
[0094] After heat treatment, the positive electrode sheet is cooled to room temperature, the pressure is released, and it is taken out to obtain an interface-stabilized all-solid-state battery positive electrode sheet.
[0095] Comparative Examples 1-4:
[0096] Comparative Example 1:
[0097] Compared to Example 1, the difference is that after the positive electrode sheet is formed, no interface stabilization heat treatment step is performed (i.e., it is kept at room temperature and pressure, pressure 0.1 MPa, temperature 25°C), and it is directly used for battery assembly. The remaining raw material ratios and preparation steps are the same.
[0098] Comparative Example 2:
[0099] Compared with Example 1, the difference is that the pressure in the interface stabilization heat treatment step is set to 350 MPa, while the other temperatures and holding times are the same.
[0100] Comparative Example 3:
[0101] Compared to Example 1, the difference lies in that the temperature in the interface stabilization heat treatment step is set to 350°C, while the remaining pressure and holding time are the same. This comparative example aims to examine the effect of excessively high temperatures on electrolyte stability.
[0102] Comparative Example 4:
[0103] Compared with Example 1, the difference is that the pressure in the interface stabilization heat treatment step is set to 5 MPa, while the other temperatures and holding times are the same.
[0104] Test Example 1-3:
[0105] Test Example 1: Positive Electrode Sheet Peel Strength Test
[0106] Positive electrode sheets prepared in Examples 1 to 3, and Comparative Examples 1 to 4 were selected as test samples. The positive electrode sheets were cut into strips 20 mm wide and 50 mm long. 3M 600 masking tape was used to adhere the strips to the surface of the positive electrode composite layer, and a 2 kg standard roller was used to roll the strips back and forth three times to ensure close contact between the tape and the electrode surface. The strips were fixed in a universal testing machine and subjected to a 180° peel test at a tensile rate of 50 mm / min. The load force during the peeling process was recorded, and the average force during the stable peeling phase was divided by the strip width to calculate the peel strength of the positive electrode sheet.
[0107] The test results are shown in Table 1.
[0108] Table 1. Test data on peel strength of positive electrode sheet
[0109]
[0110] As shown in Table 1, the peel strength of Examples 1 to 3 is higher than that of the comparative example. Within the temperature range set in the examples, the H-NBR binder softens and flows, wetting the positive electrode active material and solid electrolyte particles; the set pressure range promotes contact between particles and reduces porosity. Example 1 exhibits the highest peel strength under the synergistic effect of 30 MPa and 180°C. Comparative Example 1 lacks hot-pressing treatment, resulting in only physical accumulation between particles and the weakest bonding force. Comparative Example 2, subjected to ultra-high pressure of 350 MPa, has a peel strength of 14.5 N / m, indicating that simple physical high-pressure compaction lacks sufficient thermorheological assistance, and excessive stress may damage the bonding network. The lower strength value of Comparative Example 4 indicates that insufficient pressure prevents the formation of a dense bonding structure within the composite layer.
[0111] Test Example 2: Initial Internal Resistance Test of All-Solid-State Battery
[0112] The positive and negative electrodes prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were assembled into all-solid-state battery cells. The cells were placed in a constant temperature environment at 25°C for 2 hours to allow them to reach thermal equilibrium and electrochemical stability. Electrochemical impedance spectroscopy (EIS) was performed using an electrochemical workstation, with a frequency scan range of 1 MHz to 0.1 Hz and an AC perturbation voltage amplitude of 10 mV. The interface impedance on the positive electrode side was analyzed based on the Nyquist plot, and the normalized initial surface resistance was calculated using the electrode area.
[0113] The test results are shown in Table 2.
[0114] Table 2 Initial Sheet Resistance Test Data of All-Solid-State Batteries
[0115]
[0116] As shown in Table 2, the initial surface resistivity values of Examples 1 to 3 are distributed as follows: to Within the range, it is significantly lower than the proportion of each pair.
[0117] Example 1: Obtaining the lowest resistance value Under the combined effect of specific pressure and temperature, the interface between the positive electrode active material and the sulfide electrolyte softens and forms a stable ion transport channel, effectively reducing the interfacial charge transfer impedance.
[0118] Comparative Example 1 has a resistance value of This indicates that the particles inside the untreated electrode are in loose contact. It is noteworthy that Comparative Example 2, treated with an ultra-high voltage of 350 MPa, actually showed an increase in its resistance value. This is because excessive mechanical pressure causes the positive electrode active material particles to physically break down, creating new microcracks or non-contact interfaces inside the electrode, which in turn increases the ion transport impedance. The resistance value of Comparative Example 3 is... The resistance value is higher than that of the example, indicating that excessively high temperatures cause thermal decomposition of the sulfide electrolyte or side reactions that generate high-resistivity products. The resistance value of Comparative Example 4 is... Although superior to the untreated group, its impedance is still higher than that of the embodiments of the present invention due to insufficient density.
[0119] Test Example 3: High Voltage Cyclic Capacity Retention Test
[0120] The assembled all-solid-state battery was connected to the Blue Electric CT2001A testing system and placed in a constant temperature environment of 25℃. The charge / discharge voltage range was set to 2.5V to 4.3V. The battery was first activated by a 0.1C charge-discharge cycle, followed by a 0.5C constant current charge-discharge cycle. The discharge capacity of the 500th cycle was recorded, and its percentage relative to the discharge capacity of the first 0.5C cycle was calculated, i.e., the capacity retention rate.
[0121] The test results are shown in Table 3.
[0122] Table 3. Capacity retention data of all-solid-state batteries after 500 high-voltage cycles.
[0123]
[0124] The capacity retention rates of Examples 1 to 3 after 500 cycles ranged from 88% to 94%, which was superior to the comparative examples. Example 1 showed the highest retention rate of 94%. At a cutoff voltage of 4.3V, the specific temperature and pressure treatment effectively suppressed side reactions and buffered volume changes by forming a stable layer at the interface.
[0125] Comparative Example 1 showed a capacity retention rate of only 65%, indicating that the physical contact structure could not withstand long-term cycling. Comparative Example 2 showed a capacity retention rate of 70%, and its poor cycling stability further confirmed the irreversible mechanical damage to the material particles caused by ultra-high pressure treatment, accelerating capacity decay during cycling. Comparative Example 3 showed a retention rate of 78%, indicating that high temperature led to electrolyte degradation, affecting long-term cycling stability. Comparative Example 4 showed a retention rate of 75%, indicating that the interfacial bonding force formed under low pressure was insufficient to resist stress changes during long-term cycling, leading to particle shedding and capacity loss.
Claims
1. A method for preparing a stabilized positive electrode sheet for all-solid-state batteries, characterized in that, Includes the following steps: S1. In an inert atmosphere, the positive electrode active material, sulfide solid electrolyte and binder are dispersed in a non-polar solvent to prepare a positive electrode slurry. S2. The positive electrode slurry is coated on the surface of the current collector, and the non-polar solvent is removed by drying to obtain the positive electrode composite material precursor layer. S3. Place the positive electrode composite material precursor layer in a hot press and apply pressure and temperature simultaneously for interface stabilization heat treatment. S4. Cool the precursor layer of the positive electrode composite material after the interface stabilization heat treatment to obtain the stabilized positive electrode sheet.
2. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, In step S3, the process conditions for the interface stabilization heat treatment include: applying a pressure of 10 MPa to 100 MPa and a temperature of 100°C to 250°C.
3. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, In step S3, the holding time for the interface stabilization heat treatment is 30 to 60 minutes.
4. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, In step S1, the dew point temperature of the inert atmosphere is less than or equal to -60°C.
5. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, The positive electrode active material is selected from nickel-rich layered oxides, the sulfide solid electrolyte is selected from silver-germanium sulfide, the binder is selected from hydrogenated nitrile rubber, and the non-polar solvent is selected from anhydrous xylene.
6. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 5, characterized in that, The positive electrode active material is The sulfide solid electrolyte is .
7. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, In step S1, the mass percentages of the positive electrode active material, the sulfide solid electrolyte, and the binder satisfy the following: the positive electrode active material accounts for 70% to 80%, the sulfide solid electrolyte accounts for 18.5% to 28%, and the binder accounts for 1.5% to 2%.
8. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, The process of preparing the positive electrode slurry in step S1 includes: first dissolving the binder in the non-polar solvent to obtain a binder solution, and then adding the positive electrode active material and the sulfide solid electrolyte to the binder solution for mixing and dispersion.
9. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, In step S4, the positive electrode composite precursor layer is cooled to below 60°C or to room temperature.
10. The method for preparing a stabilized positive electrode sheet for an all-solid-state battery according to claim 1, characterized in that, In step S4, the cooling process is carried out under pressure while maintaining the interface stabilization heat treatment, or under pressure relief.