Preparation method of solid electrolyte, sintering tank and sintering device

Abstract

The invention relates to a preparation method of a solid electrolyte, a sintering tank and a sintering device.The preparation method comprises the steps that raw materials are added into the sintering tank, and the raw materials in the sintering tank are compacted; sealing the sintering tank; the sealed sintering tank is placed in a sintering furnace, the sintering furnace is heated to the sintering temperature, and the raw materials in the sintering tank are sintered under the condition that the sintering tank rotates; and taking out and obtaining the solid electrolyte in the sintering tank. According to the preparation method of the solid electrolyte provided by the invention, the raw materials are placed in the sintering tank to be sealed, sintering is carried out under the condition of rotating the sintering tank, and the temperature field around the sintering tank is more uniform through rotation and sealing, that is, the temperature field borne by the raw materials in the sintering tank is more uniform; therefore, the requirements of the preparation method on the sealing property and the temperature field consistency of the sintering furnace are reduced; and the raw materials are tamped and then sintered, so that industrial large-scale production is facilitated, and the efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of electrolytes, and in particular to a preparation method, a sintering tank and a sintering device for a solid electrolyte. Background Art

[0002] As a new type of energy storage and conversion material, solid electrolytes are widely used in batteries, fuel cells, solar cells and other fields due to their high ionic conductivity, high energy density and good chemical stability. In the field of solid electrolytes, sulfide and halide solid electrolytes are considered to be one of the most promising solid electrolytes due to their high conductivity and wide electrochemical window.

[0003] At present, the conventional preparation process of solid electrolytes is ball milling and calcination under an inert atmosphere; in the laboratory stage, an inert atmosphere is provided by using a glove box, but the glove box used in the laboratory is not suitable for large-scale production; in industry, industrial kilns can be used for large-scale production of solid electrolytes, but the existing industrial kilns are difficult to meet the requirements of sealing and temperature field uniformity for large-scale production of solid electrolytes. Summary of the invention

[0004] Based on this, it is necessary to provide a method for preparing a solid electrolyte, a sintering tank and a sintering device that do not have high requirements on the temperature field uniformity of the sintering furnace.

[0005] A method for preparing a solid electrolyte, the method comprising the following steps:

[0006] Adding raw materials into a sintering tank, and compacting the raw materials in the sintering tank;

[0007] Sealing the sintering tank;

[0008] Placing the sealed sintering pot into a sintering furnace, heating the sintering furnace to a sintering temperature, and sintering the raw materials in the sintering pot while the sintering pot is rotating;

[0009] The solid electrolyte in the sintering tank is taken out and obtained.

[0010] In one embodiment, the compaction operation is performed at a pressure of 10 MPa to 600 MPa.

[0011] In one embodiment, the rotation speed is 20 rpm to 2500 rpm.

[0012] In one embodiment, the sintering temperature is 180° C. to 800° C., and the sintering time is 1 h to 20 h.

[0013] In one embodiment, in the step of sintering the raw materials in the sintering pot under the condition that the sintering pot rotates, the sintering pot is driven to rotate in the sintering furnace by a driving member.

[0014] The present application also provides a sintering can for implementing any of the above methods for preparing a solid electrolyte, wherein the sintering can comprises a cover and a plurality of can bodies.

[0015] A first cavity is provided in the tank body, and the first cavity is used to contain the raw material of the solid electrolyte;

[0016] An opening communicating with the first cavity is provided at the end of the can body, and the cover body is detachably covered on the end of the can body to seal the opening, and the cover body is simultaneously covered on the ends of a plurality of the can bodies.

[0017] In one of the embodiments, a mounting portion radially protruding from the outer circumference of the tank body is provided at the end of the tank body, and the mounting portion is sealingly connected to the cover body.

[0018] In one of the embodiments, a mounting area is provided on one side of the cover body close to the mounting portion, and the mounting area is arranged corresponding to the mounting portion and is connected to the mounting portion of the same cover body and is arranged at intervals.

[0019] In one of the embodiments, the sintering pot further includes a sealing member, and the sealing member is clamped between the mounting portion and the mounting area.

[0020] In one embodiment, the mounting portion is provided with a first hole penetrating the mounting portion, the mounting area is provided with a second hole penetrating the cover body, and the first hole and the second hole are arranged correspondingly;

[0021] The sintering pot further includes a fastener, which penetrates into the first hole and the corresponding second hole to fix the pot body and the cover body.

[0022] In one embodiment, a protrusion is provided on the side of the cover away from the tank body, and a gear is provided on the protrusion.

[0023] Alternatively, a gear is disposed on the edge of the cover.

[0024] In one embodiment, the openings are provided at both ends of the tank body, and the number of the cover bodies is two, and they are respectively connected to the two ends of the tank body.

[0025] The present application also provides a solid electrolyte sintering device, comprising a sintering furnace, a driving member and any one of the sintering pots as described above, wherein the sintering furnace has a second cavity, and the driving member drives the sintering pot to rotate in the second cavity.

[0026] Compared with the prior art, the preparation method of the solid electrolyte provided in the present application places the raw materials in a sealed sintering tank, and sintering is performed under the condition of rotating the sintering tank. The rotation and sealing make the temperature field around the sintering tank more uniform, that is, the temperature field to which the raw materials in the sintering tank are subjected is more uniform, thereby reducing the requirements of the preparation method on the sealing and temperature field consistency of the sintering furnace; and the present application tamps the raw materials before sintering, which is convenient for industrial mass production and has high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic structural diagram of a sintering tank for a solid electrolyte according to an embodiment of the present application from a first perspective;

[0029] Figure 2 This is a structural schematic diagram of a sintering tank for a solid electrolyte according to an embodiment of the present application from a second viewing angle;

[0030] Figure 3 This is a schematic structural diagram of a sintering tank for a solid electrolyte according to an embodiment of the present application from a third perspective.

[0031] Figure numerals: 10, sintering tank; 110, cover body; 111, installation area; 112, first hole; 113, protrusion; 134, gear; 120, tank body; 121, installation part; 122, second hole; 130, sealing member. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0037] The preparation method of the solid electrolyte provided in the present application is mainly used for preparing the solid electrolyte of sulfide and halide. The preparation method comprises the following steps: adding raw materials into a sintering tank and compacting the raw materials in the sintering tank; sealing the sintering tank; placing the sealed sintering tank into a sintering furnace, heating the sintering furnace to the sintering temperature, and sintering the raw materials in the sintering tank under the condition of rotating the sintering tank; taking out and obtaining the solid electrolyte in the sintering tank.

[0038] It can be understood that the raw materials are placed in a sintering pot and sealed, and sintered under the condition of rotating the sintering pot. The rotation and sealing make the temperature field around the sintering pot more uniform, that is, the temperature field to which the raw materials in the sintering pot are subjected is more uniform, thereby reducing the requirements of the preparation method on the sealing and temperature field consistency of the sintering furnace; and the present application tamps the raw materials before sintering, which is convenient for industrial mass production and high efficiency.

[0039] The sintering furnace is generally composed of a heating zone, a heat preservation zone, and a cooling zone. In the prior art, when sintering the raw materials of the solid electrolyte, the raw materials are generally placed in a sagger, and the sagger is passed through the heating zone, the heat preservation zone, and the cooling zone in the sintering furnace in sequence, thereby completing the sintering of the raw materials in the sagger. In the present application, the sintering pot also passes through the heating zone, the heat preservation zone, and the cooling zone in the sintering furnace in sequence, but unlike the prior art, the sintering pot of the present application rotates while passing through the above-mentioned heating zone, the heat preservation zone, and the cooling zone. By sealing and rotating the sintering pot, the temperature field near the sintering pot is made more uniform, thus reducing the requirements for the uniformity of the temperature field in the sintering furnace, and reducing production conditions and production costs.

[0040] It is understood that the target products obtained by the above preparation method include Li6PS5Cl, Li 10 GeP2S 12 , Li3PS4, Li3InCl6, Li2ZrCl6, etc. The raw materials added to the sintering tank can be Li2S, P2S5, LiCl, GeS2, LiBr, InCl3, ZrCl6, etc., or a mixture of different substances premixed in a certain proportion. The specific raw materials and mixing ratios can be adjusted according to the target product, and this application is not limited to this.

[0041] In one embodiment, the pressure of the compaction operation is 10MPa to 600MPa. If the pressure is too small, it cannot be guaranteed that the raw materials in the sintering tank can be compacted. If the pressure is too large, the tank body may be damaged. Therefore, the pressure of the compaction operation set in this application is appropriate. In this way, the gaps between the raw materials can be reduced to ensure that the raw materials can contact each other during sintering, so that the sintering reaction can fully occur. Schematically, the pressure of the compaction operation can be specifically set to 50MPa, 150MPa, 250MPa, 350MPa, 450MPa, 550MPa, or a range composed of any two of these values, and this application does not limit this.

[0042] In one embodiment, the speed of rotation is 20rpm to 2500rpm. If the speed is too slow, the effect of the uniform sintering tank temperature field that rotary sintering can bring cannot be brought into play. If the speed is too fast, the stability of the airflow in the sintering furnace may be disturbed. Therefore, the rotation speed set in the present application is appropriate. In this way, the temperature field around the tank body is more uniform, which reduces the requirements for the uniformity of the sintering furnace temperature field, so that it is easier to provide a uniform temperature field for the raw materials of the sintered solid electrolyte. Schematically, the speed of rotation can be specifically set to 100rpm, 250rpm, 500rpm, 750rpm, 1000rpm, 1250rpm, 1500rpm, 1750rpm, 2000rpm, 2250rpm, or the range composed of any two of these values, and the present application is not limited to this.

[0043] In one embodiment, the sintering temperature is 180°C to 800°C, and the sintering time is 1h to 20h. In this way, it can be ensured that the solid electrolyte raw materials in the sintering tank can be fully sintered. Schematically, the sintering temperature can be specifically set to 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, or a range consisting of any two of these values, and this application is not limited to this. Similarly, the sintering time can be set to 2h, 5h, 10h, 15h, or a range consisting of any two of these values, and this application is not limited to this. When applying the preparation method of the solid electrolyte in this application, the sintering temperature and sintering time can be adjusted and set according to the target product.

[0044] Furthermore, the heating rate is 1°C / min to 20°C / min, which can ensure that the solid electrolyte raw materials in the sintering tank are gradually heated, so that the raw materials are heated more evenly, and the raw materials at different positions of the sintering tank are not heated evenly and the reaction is not sufficient. Indicatively, the heating rate can be specifically set to 5°C / min, 9°C / min, 13°C / min, 17°C / min, or a range consisting of any two of these values, and this application does not limit this.

[0045] In one embodiment, the method for preparing a solid electrolyte further includes: cooling a sintering tank sintered at a sintering temperature, and then taking it out and obtaining a solid electrolyte in the sintering tank. Furthermore, the cooling rate is 1°C / min to 20°C / min, so that the sintered solid electrolyte can be stably restored to room temperature to ensure the stability of the solid electrolyte performance. Schematically, the cooling rate can be specifically set to 5°C / min, 9°C / min, 13°C / min, 17°C / min, or a range consisting of any two of these values, and this application is not limited to this.

[0046] In one embodiment, in the step of sintering the raw materials in the sintering pot under the condition that the sintering pot rotates, the sintering pot is driven to rotate in the sintering furnace by a driving member. In this way, the stability of the rotation of the sintering pot in the sintering furnace can be ensured, and the rotation speed of the sintering pot can be adjusted by the driving member.

[0047] See also Figures 1 to 3 The present application also provides a solid electrolyte sintering tank 10, which is used to implement the preparation method of the solid electrolyte in any of the above embodiments, such as Figure 1 As shown, the sintering tank 10 includes a cover body 110 and a plurality of tank bodies 120. A first cavity is provided in the tank body 120, and the first cavity is used to accommodate the raw materials of the solid electrolyte. An opening connected to the first cavity is provided at the end of the tank body 120, and the cover body 110 is detachably covered on the end of the tank body 120 to seal the opening. The cover body 110 is simultaneously covered on the ends of the plurality of tank bodies 120.

[0048] It can be understood that when the sintering tank 10 in this embodiment is used to contain raw materials for sintering solid electrolytes, the pre-mixed raw materials are added in batches into the first cavity of the tank body 120 through the opening. After each addition of raw materials, the raw materials in the first cavity are compacted to reduce the gaps between the raw materials, ensuring that the raw materials can contact each other during sintering, so that the sintering reaction can fully occur; the compaction operation can also allow the first cavity to accommodate more raw materials, so that solid electrolytes can be produced on a large scale. After the raw materials are added, the cover body 110 is used to cover the end of the tank body 120, so as to seal the first cavity.

[0049] In one embodiment, Figure 1 and Figure 3 As shown, both ends of the tank body 120 are provided with openings, and there are two covers 110, which are respectively connected to both ends of the tank body 120. When the sintering tank 10 in this embodiment is used to contain the raw materials of the solid electrolyte, one end of the tank body 120 is first fixed to one of the covers 110, and then the raw materials for sintering the solid electrolyte are added to the first cavity of the sintering tank 10, and finally the other cover 110 is covered on the other end of the tank body 120.

[0050] In this embodiment, one cover body 110 is simultaneously covered on the ends of multiple can bodies 120, so that the temperatures of the multiple can bodies 120 sealed by the same cover body 110 are the same, so that the performance of the same batch of target products obtained by sintering is more consistent, thereby improving the yield rate.

[0051] Furthermore, the same cover 110 can seal 2 to 20 tanks 120 at the same time. In this way, the raw materials of the solid electrolyte in multiple tanks 120 can be sintered at the same time, thereby increasing the production capacity. Schematically, one cover 110 can seal 6 tanks 120 at the same time. In other embodiments, one cover 110 can also seal other numbers of tanks 120 at the same time, and this application does not limit this.

[0052] Furthermore, the tank body 120 is cylindrical, so that the temperature inside the tank body 120 can be more uniform. The tank body 120 can be cylindrical with a circular cross section, or a cylindrical body with a square, pentagonal or other cross section, and the present application does not limit this.

[0053] Furthermore, the material of the tank body 120 of the sintering tank 10 can be lined with quartz, or can be made of materials such as corundum, titanium, stainless steel, etc., and the present application does not limit this, as long as the tank body 120 can withstand a temperature of 1000° C. Similarly, the material of the cover body 110 can be lined with quartz, or can be made of materials such as corundum, titanium, stainless steel, etc., and the present application does not limit this, as long as the tank body 120 can withstand a temperature of 1000° C.

[0054] In one embodiment, the end of the tank body 120 is provided with a mounting portion 121 radially protruding from the outer circumference of the tank body 120, and the mounting portion 121 is sealed and connected to the cover body 110. In this way, the sealing of the tank body 120 is more convenient.

[0055] In one embodiment, a mounting area 111 is provided on one side of the cover 110 close to the mounting portion 121, and the mounting area 111 is arranged corresponding to the mounting portion 121, and the mounting portions 121 connected to the same cover 110 are arranged at intervals. In other words, there are gaps between the multiple tank bodies 120, and the atmosphere in the sintering furnace can flow around the outer circumference of the tank body 120. In this way, the temperature in the multiple tank bodies 120 is more uniform, which makes it easier to meet the requirements of the sintering tank 10 for temperature field uniformity, and can improve the heat exchange efficiency between the sintering tank 10 and the sintering furnace.

[0056] Furthermore, the tank body 120 is a cylindrical body with a circular cross section, and the surface of the cover body 110 close to the tank body 120 is circular, and the center of the cover body 110 is the center of its circle. It should be noted that the installation area 111 is an area that coincides with the projection area of ​​the tank body 120 along the axial direction of the tank body 120 to the side of the cover body 110. The installation area 111 is also a circular area, and the center of the installation area 111 is the center of its circle. The distances between the multiple installation areas 111 and the center of the cover body 110 are the same. And the centers of the multiple installation areas 111 are located on the same circumference, and the centers of the multiple installation areas 111 are evenly arranged along the circumferential direction of the circumference. In this way, the structure of the sintering tank 10 is more compact and more reasonable, and it is more conducive to the atmosphere in the sintering furnace to flow on the outer peripheral side of the tank body 120, thereby making the temperature in the multiple tank bodies 120 more uniform.

[0057] In one embodiment, the sintering pot 10 further includes a sealing member 130, and the sealing member 130 is clamped between the mounting portion 121 and the mounting area 111. In this way, the sealing effect can be further ensured. Schematically, the sealing ring can be selected from O-type sealing rings, U-type sealing rings, rectangular sealing rings, Y-type sealing rings and other types of sealing rings, and this application does not limit this.

[0058] In one embodiment, see Figure 2 The mounting portion 121 is provided with a first hole 112 penetrating the mounting portion 121, and the mounting area 111 (such as Figure 2 The sintering pot 10 further includes a fastener, which penetrates the first hole 112 and the corresponding second hole 122 to fix the pot body 120 and the cover body 110. In this way, the cover body 110 and the pot body 120 can be fixed together more simply and tightly. Schematically, the number of the first hole 112 and the second hole 122 are both 6, so that the tight fixation between the cover body 110 and the pot body 120 can be ensured, and too much time will not be spent on fixing the pot body 120 and the cover body 110 due to too many fasteners, thereby not reducing production efficiency. In other embodiments, the number of the first hole 112 and the second hole 122 can also be other numbers, and the present application does not limit this.

[0059] In one embodiment, a protrusion 113 is provided on one side of the cover body 110 away from the tank body 120, and a gear 134 is provided on the protrusion 113. A driving member and a toothed structure that can mesh with the teeth of the gear 134 are provided in the sintering furnace, and the driving member drives the toothed structure to move, and the toothed structure then drives the gear 134 and the protrusion 113 to move, thereby driving the sintering pot 10 to rotate in the sintering furnace. Schematically, the toothed structure can be two tooth plates, and the sintering pot 10 can rotate in the sintering furnace through the differential movement between the two tooth plates in the sintering furnace. The toothed structure can be a tooth plate and a bearing, and the sintering pot 10 can rotate in the sintering furnace through the drive of a tooth plate and a bearing, or other methods can be used to make the sintering pot 10 rotate in the sintering furnace, and this application does not limit this.

[0060] In one embodiment, a gear 134 is provided at the edge of the cover 110. In this way, the cover 110 can be driven by a driving member in the sintering furnace, so that the sintering pot 10 can rotate in the sintering furnace. Similarly, the sintering pot 10 can rotate in the sintering furnace by the differential motion between two tooth plates in the sintering furnace, or by a tooth plate and a bearing, or by other methods, which are not limited in the present application.

[0061] The present application also provides a solid electrolyte sintering device, comprising a sintering furnace, a driving member and a sintering pot 10 as in any of the above embodiments, wherein the sintering furnace has a second cavity, and the driving member drives the sintering pot 10 to rotate in the second cavity.

[0062] It should be noted that the sintering furnace has at least three temperature zones connected in sequence, which are the heating zone, the insulation zone and the cooling zone. The direction from the heating zone to the cooling zone is defined as the length direction of the sintering furnace, and the gravity direction is defined as the height direction of the sintering furnace. The direction perpendicular to the length direction and perpendicular to the height direction in each temperature zone is defined as the width direction of the sintering furnace.

[0063] Schematically, the driving member includes a motor, a transmission shaft, an upper tooth plate and a lower tooth plate, and the upper tooth plate and the lower tooth plate exist in pairs, and each pair of upper tooth plates and lower tooth plates are respectively located on both sides of the second cavity in the width direction. It can be understood that the motor, as a power source, generates a rotational force after being energized, and the output shaft of the motor is directly or indirectly connected to the transmission shaft. The transmission shaft receives power from the motor and converts the rotational motion of the output shaft into linear motion, and then transmits the linear motion to the upper tooth plate or the lower tooth plate, thereby driving the upper tooth plate or the lower tooth plate to perform linear motion.

[0064] Furthermore, a raised portion is provided on the side of the cover of the sintering pot away from the pot body, and a gear is provided on the raised portion, and the teeth on the gear can mesh with the teeth of the upper tooth plate and the teeth of the lower tooth plate. In this embodiment, when the sintering pot is placed horizontally in the second cavity, the gear should be placed between the upper tooth plate and the lower tooth plate, so that when the upper tooth plate and the lower tooth plate perform differential motion, the upper tooth plate and the lower tooth plate can drive the gear to rotate, thereby driving the sintering pot to rotate in the second cavity. Further, the rotation speed of the sintering pot can be adjusted by adjusting the difference in movement speed between the upper tooth plate and the lower tooth plate. Schematically, only the upper tooth plate can be driven to move, or only the lower tooth plate can be driven to move. This application is not limited to this, as long as the sintering pot can reach the rotation speed.

[0065] It is understandable that the sintering device further includes a heating element for heating the second cavity so that the second cavity can heat and keep the sintering tank warm, thereby enabling the raw materials of the solid electrolyte in the sintering tank to be sintered.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A method for preparing a solid electrolyte, characterized in that: The preparation method comprises the following steps: Adding raw materials into a sintering tank, and compacting the raw materials in the sintering tank; Sealing the sintering tank; Placing the sealed sintering pot into a sintering furnace, heating the sintering furnace to a sintering temperature, and sintering the raw materials in the sintering pot while the sintering pot is rotating; The solid electrolyte in the sintering tank is taken out and obtained.

2. The method for preparing a solid electrolyte according to claim 1, characterized in that: The compaction operation is performed at a pressure of 10 MPa to 600 MPa.

3. The method for preparing a solid electrolyte according to claim 1, characterized in that: The rotation speed is 20 rpm to 2500 rpm.

4. The method for preparing a solid electrolyte according to claim 1, characterized in that: The sintering temperature is 180° C. to 800° C., and the sintering time is 1 hour to 20 hours.

5. The method for preparing a solid electrolyte according to claim 1, characterized in that: In the step of sintering the raw material in the sintering pot under the condition that the sintering pot rotates, the sintering pot is driven to rotate in the sintering furnace by a driving member.

6. A sintering tank for a solid electrolyte, characterized in that: For implementing the method for preparing a solid electrolyte according to any one of claims 1 to 5, the sintering tank comprises a cover body and a plurality of tank bodies, A first cavity is provided in the tank body, and the first cavity is used to contain the raw material of the solid electrolyte; An opening communicating with the first cavity is provided at the end of the can body, and the cover body is detachably covered on the end of the can body to seal the opening, and the cover body is simultaneously covered on the ends of a plurality of the can bodies.

7. The sintering pot according to claim 6, characterized in that: The end of the tank body is provided with a mounting portion radially protruding from the outer circumference of the tank body, and the mounting portion is sealed and connected to the cover body.

8. The sintering pot according to claim 7, characterized in that: A mounting area is provided on one side of the cover body close to the mounting portion. The mounting area is arranged corresponding to the mounting portion and is connected to the mounting portion of the same cover body and is arranged at intervals.

9. The sintering pot according to claim 8, characterized in that: The sintering pot further includes a sealing member sandwiched between the mounting portion and the mounting area.

10. The sintering pot according to claim 8, characterized in that: The mounting portion is provided with a first hole penetrating the mounting portion, the mounting area is provided with a second hole penetrating the cover body, and the first hole and the second hole are arranged correspondingly; The sintering pot further includes a fastener, which penetrates into the first hole and the corresponding second hole to fix the pot body and the cover body.

11. The sintering pot according to any one of claims 6 to 10, characterized in that: A convex portion is provided on one side of the cover away from the tank body, and a gear is provided on the convex portion. Alternatively, a gear is disposed on the edge of the cover.

12. The sintering pot according to claim 11, characterized in that: The openings are arranged at both ends of the tank body, and there are two covers, which are respectively connected to the two ends of the tank body.

13. A sintering device for solid electrolyte, characterized in that: It comprises a sintering furnace, a driving member and a sintering pot as claimed in any one of claims 6 to 12, The sintering furnace has a second cavity, and the driving member drives the sintering pot to rotate in the second cavity.

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