A displacement electrodialysis device for preparing lithium sulfide in the field of new energy

Abstract

The utility model relates to a kind of for the replacement electrodialysis device of lithium sulfide preparation in new energy field, including replacement electrodialysis component and control component, the replacement electrodialysis component includes: positive electrode chamber, negative electrode chamber, first chamber, second chamber, third chamber, multiple anion exchange membrane and multiple cation exchange membrane;The cation exchange membrane is placed between the first chamber and second chamber, and the anion exchange membrane is placed between the second chamber and third chamber;Two ends of the control component are electrically connected with the positive electrode chamber and negative electrode chamber respectively.The utility model generates lithium sulfide solution by the action of cation exchange membrane and anion exchange membrane respectively in second chamber by control component applied electric field, lithium hydroxide solution of first chamber and sodium sulfide solution of third chamber, energy consumption bottom, reaction does not need high temperature and high pressure condition, and whole process does not produce harmful gas, suitable for industrialization continuous production.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically to a displacement electrodialysis device for the preparation of lithium sulfide in the new energy field. Background Technology

[0002] Lithium sulfide (LiS) is an important lithium compound with wide applications in solid-state batteries, lithium-sulfur batteries, and other fields. Its preparation processes mainly include three routes: solid-phase method, liquid-phase method, and gas-phase method.

[0003] Solid-state synthesis is one of the most common methods for preparing lithium sulfide, typically involving high-temperature sintering. A lithium source (such as metallic lithium or lithium salt) is mixed with a sulfur source (such as elemental sulfur or sulfides) in a specific ratio; the mixture is then heated at high temperatures (usually 500–900°C) in an inert atmosphere (such as argon or nitrogen); a solid-state reaction occurs, producing lithium sulfide; after cooling, the mixture is ground to obtain powdered lithium sulfide.

[0004] The liquid-phase method synthesizes lithium sulfide through chemical reactions in solution, typically including hydrothermal and solvothermal methods. Soluble lithium salts (such as LiCl and LiNO3) and sulfide precursors (such as sodium sulfide and H2S gas) are dissolved in a solvent; the reaction is carried out under specific temperature and pressure to form lithium sulfide precipitate; after filtration, washing, and drying, the lithium sulfide product is obtained.

[0005] The gas-phase method mainly involves the chemical reaction of gaseous precursors at high temperatures to directly generate lithium sulfide. Gaseous compounds of lithium and sulfur (such as Li vapor and H₂S gas) are introduced into the reaction chamber; a gas-phase reaction occurs under high-temperature conditions to generate lithium sulfide; after condensation and collection, high-purity lithium sulfide is obtained.

[0006] However, solid-phase methods require high reaction temperatures, consume a lot of energy, and have limited product purity; liquid-phase methods involve complex processes, multiple chemical reactions, and have high costs for solvents and reagents, making them unsuitable for large-scale industrial production; gas-phase methods require large equipment investments, are complex to operate, have harsh reaction conditions, and have high safety requirements. Utility Model Content

[0007] In view of the above problems, this utility model provides a displacement electrodialysis device for the preparation of lithium sulfide in the new energy field, so as to solve the problems of high energy consumption and unsuitability for continuous industrial production in the preparation of lithium sulfide by traditional methods.

[0008] To achieve the above objectives, this utility model provides a displacement electrodialysis device for the preparation of lithium sulfide in the new energy field, comprising:

[0009] A displacement electrodialysis assembly includes: a positive electrode chamber, a negative electrode chamber, a first chamber, a second chamber, a third chamber, multiple anion exchange membranes, and multiple cation exchange membranes. The positive electrode chamber and the negative electrode chamber are arranged opposite to each other. The first chamber, the second chamber, and the third chamber are arranged in a sequential array along the direction from the positive electrode chamber to the negative electrode chamber. The second chamber is used to contain a lithium sulfide solution, the first chamber is used to contain a lithium ion solution, and the third chamber is used to contain a sulfide ion solution. The cation exchange membrane is placed between the first chamber and the second chamber, and the anion exchange membrane is placed between the second chamber and the third chamber.

[0010] A control component, the two ends of which are electrically connected to the positive electrode chamber and the negative electrode chamber, respectively.

[0011] Preferably, it further includes: a fourth chamber, the fourth chamber being disposed between the positive electrode chamber and the first chamber, and an anion exchange membrane being provided between the fourth chamber and the first chamber, the fourth chamber being used to absorb anions in the first chamber.

[0012] Preferably, a cation exchange membrane is provided in the fourth chamber.

[0013] Preferably, it further includes: a fifth chamber, the fifth chamber being disposed between the negative electrode chamber and the third chamber, and the fifth chamber having a cation exchange membrane between the third chamber and the third chamber, the fifth chamber being used to absorb cations in the third chamber.

[0014] Preferably, an anion exchange membrane is provided in the fifth chamber.

[0015] Preferably, a sixth chamber, a seventh chamber, and an eighth chamber are further provided on the side of the fifth chamber away from the first chamber; the sixth chamber, the seventh chamber, and the eighth chamber are arranged in a sequential array along the direction from the positive electrode chamber to the negative electrode chamber, and an anion exchange membrane is provided between the fifth chamber and the sixth chamber, a cation exchange membrane is provided between the sixth chamber and the seventh chamber, and an anion exchange membrane is provided between the seventh chamber and the eighth chamber;

[0016] The seventh chamber is used to contain a lithium sulfide solution, the sixth chamber is used to contain a lithium ion solution, and the eighth chamber is used to contain a sulfide ion solution.

[0017] Preferably, it also includes: a circulating electrode liquid tank, an electrode liquid filter, a blower, and an electrode liquid pump;

[0018] The two ends of the circulating electrode tank are respectively connected to the two ends of the positive electrode chamber or the negative electrode chamber, and the electrode filter and the electrode pump are placed on the connecting pipeline, and the blower is connected to the circulating electrode tank.

[0019] Preferably, it also includes: a lithium sulfide water tank, a lithium sulfide filter, and a lithium sulfide pump;

[0020] The two ends of the lithium sulfide water tank are respectively connected to the two ends of the second chamber, and the lithium sulfide filter and the lithium sulfide pump are placed on the connecting pipeline.

[0021] Preferably, it also includes: a sulfur ion water tank, a sulfur ion filter, and a sulfur ion pump;

[0022] The two ends of the sulfur ion water tank are respectively connected to the two ends of the third chamber, and the sulfur ion filter and sulfur ion pump are placed on the connecting pipeline.

[0023] Preferably, it also includes: a lithium-ion water tank, a lithium-ion filter, and a lithium-ion pump;

[0024] The two ends of the lithium-ion water tank are respectively connected to the two ends of the first chamber, and the lithium-ion filter and the lithium-ion pump are placed on the connecting pipeline.

[0025] The advantages of the above technical solution, which differ from the existing technology, are as follows: The present invention applies an electric field through a control component, so that the lithium hydroxide solution in the first chamber and the sodium sulfide solution in the third chamber are converted into lithium sulfide solution in the second chamber under the action of the cation exchange membrane and the anion exchange membrane, respectively. The energy consumption is low, the reaction does not require high temperature and high pressure conditions, and the whole process does not produce harmful gases, making it suitable for continuous industrial production.

[0026] The above description of the utility model is merely an overview of the technical solution of this utility model. In order to enable those skilled in the art to better understand the technical solution of this utility model and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this utility model easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this utility model. Attached Figure Description

[0027] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the present invention and other related contents, and should not be considered as limitations on the present invention.

[0028] In the accompanying drawings of the instruction manual:

[0029] Figure 1 This is a schematic diagram of the displacement electrodialysis component described in this embodiment;

[0030] Figure 2 This is a flowchart of the present invention.

[0031] The reference numerals used in the above figures are explained as follows:

[0032] 1. Replacement electrodialysis unit; 11. First chamber; 12. Second chamber; 13. Third chamber; 14. Anion exchange membrane; 15. Cation exchange membrane; 16. Fourth chamber; 17. Fifth chamber; 18. Sixth chamber; 19. Seventh chamber; 20. Eighth chamber; 31. Circulating electrode liquid tank; 32. Electrode liquid filter; 33. Blower; 34. Electrode liquid pump; 41. Lithium sulfide water tank; 42. Lithium sulfide filter; 43. Lithium sulfide pump; 51. Sulfide ion water tank; 52. Sulfide ion filter; 53. Sulfide ion pump; 61. Lithium ion water tank; 62. Lithium ion filter; 63. Lithium ion pump; 71. Sodium hydroxide water tank; 72. Filter; 73. Sodium hydroxide circulation pump; 8. Control unit. Detailed Implementation

[0033] To illustrate in detail the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this utility model, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this utility model and are therefore intended to limit the scope of protection of this utility model.

[0034] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0035] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0036] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0037] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0038] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0039] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0040] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0041] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0042] Please see Figures 1 to 2 This embodiment provides a displacement electrodialysis device for the preparation of lithium sulfide in the new energy field, comprising:

[0043] A displacement electrodialysis assembly 1 includes: a positive electrode chamber, a negative electrode chamber, a first chamber 11, a second chamber 12, a third chamber 13, multiple anion exchange membranes 14, and multiple cation exchange membranes 15. The positive electrode chamber and the negative electrode chamber are arranged opposite to each other. The first chamber 11, the second chamber 12, and the third chamber 13 are arranged in a sequential array along the direction from the positive electrode chamber to the negative electrode chamber. The second chamber 12 is used to contain a lithium sulfide solution, the first chamber 11 is used to contain a lithium ion solution, the third chamber 13 is used to contain a sulfide ion solution, the cation exchange membranes 15 are placed between the first chamber 11 and the second chamber 12, and the anion exchange membranes 14 are placed between the second chamber 12 and the third chamber 13.

[0044] The control component 8 has two ends electrically connected to the positive electrode chamber and the negative electrode chamber, respectively.

[0045] An anode plate and a cathode plate are respectively installed in the positive electrode chamber and the negative electrode chamber. The control component 8 is connected to the anode plate and the cathode plate. The circuit loop is formed by the solution in each chamber, so that the anions and cations flow in each chamber.

[0046] The cation exchange membrane 15 is a selective permeation membrane that allows only cations to pass through. The cation exchange is located between the first chamber 11 and the second chamber 12 to allow lithium ions in the first chamber 11 to pass through the cation exchange membrane 15 into the second chamber 12, while blocking the flow of anions between the first chamber 11 and the second chamber 12.

[0047] The lithium-ion solution in the first chamber 11 is a lithium hydroxide solution.

[0048] The anion exchange membrane 14 is a selective permeation membrane that allows only anions to pass through. The anion exchange membrane 14 is disposed between the second chamber 12 and the third chamber 13 to allow sulfur ions in the third chamber 13 to pass through the anion exchange membrane 14 into the second chamber 12, while blocking the flow of cations between the third chamber 13 and the second chamber 12.

[0049] The sulfide solution in the third chamber 13 is a sodium sulfide solution.

[0050] Specifically, after the control component 8 is energized, a stable electric field is formed between the positive and negative electrode chambers. Lithium ions in the first chamber 11 move towards the negative electrode (i.e., closer to the second chamber 12) under the influence of the electric field and enter the second chamber 12 through the cation exchange membrane 15 between the first chamber 11 and the second chamber 12. Sulfide ions in the third chamber 13 move towards the positive electrode (i.e., closer to the second chamber 12) under the influence of the electric field and enter the second chamber 12 through the anion exchange membrane 14 between the second chamber 12 and the third chamber 13. Lithium ions and sulfur ions converge directionally in the second chamber 12 and synthesize a lithium sulfide solution, thus achieving the preparation of lithium sulfide.

[0051] Compared with the prior art, this embodiment uses the control component 8 to apply an electric field so that the lithium hydroxide solution in the first chamber 11 and the sodium sulfide solution in the third chamber 13 are converted into lithium sulfide solution in the second chamber 12 under the action of the cation exchange membrane 15 and the anion exchange membrane 14, respectively. This method has low energy consumption, does not require high temperature and high pressure conditions for the reaction, and does not produce harmful gases throughout the process, making it suitable for continuous industrial production.

[0052] Please see Figure 1 In this embodiment, the displacement electrodialysis device further includes a fourth chamber 16, which is located between the positive electrode chamber and the first chamber 11, and an anion exchange membrane 14 is provided between the fourth chamber 16 and the first chamber 11. The fourth chamber 16 is used to absorb anions in the first chamber 11.

[0053] The fourth chamber 16 contains a sodium hydroxide solution. An anion exchange membrane 14 is disposed between the fourth chamber 16 and the first chamber 11. Under the action of an electric field, hydroxide ions in the lithium hydroxide solution in the first chamber 11 will flow through the anion exchange membrane 14 into the fourth chamber 16 to increase the alkali concentration in the fourth chamber 16 and obtain a high-concentration sodium hydroxide solution.

[0054] Setting up a fourth chamber 16 can reduce the generation of by-products, avoid waste of raw materials, and improve the utilization rate of lithium-containing raw material liquid.

[0055] Please see Figure 1 In this embodiment, a cation exchange membrane 15 is provided in the fourth chamber 16.

[0056] A cation exchange membrane 15 is provided in the fourth chamber 16 to divide the fourth chamber 16, that is, one half of the area is the side close to the positive electrode chamber, and the other half of the area is the side close to the first chamber 11.

[0057] The fourth chamber 16 contains a sodium hydroxide solution. When the control component 8 is activated, an electric field is applied to the displacement electrodialysis component 1. Sodium ions in the sodium hydroxide solution in the region near the positive electrode chamber pass through the cation exchange membrane 15 under the action of the electric field and enter the other half of the region to increase the concentration of sodium ions in that region.

[0058] An anion exchange membrane 14 is provided between the other half of the fourth chamber 16 and the first chamber 11. Under the action of an electric field, hydroxide ions in the first chamber 11 pass through the anion exchange membrane 14 and enter the other half of the fourth chamber 16 to increase the concentration of hydroxide ions in that area.

[0059] Setting a cation exchange membrane 15 in the fourth chamber 16 can increase the concentration of sodium hydroxide solution in the fourth chamber 16. While preparing lithium sulfide solution, the raw materials are not wasted, and a high concentration of sodium hydroxide solution is obtained, which improves the utilization rate of raw materials and reduces the production cost.

[0060] Please see Figure 1 In this embodiment, it further includes a fifth chamber 17, which is placed between the negative electrode chamber and the third chamber 13, and a cation exchange membrane 15 is provided between the fifth chamber 17 and the third chamber 13. The fifth chamber 17 is used to absorb cations in the third chamber 13.

[0061] The fifth chamber 17 contains a sodium hydroxide solution. A cation exchange membrane 15 is disposed between the fifth chamber 17 and the third chamber 13. Under the action of an electric field, sodium ions in the sodium sulfide solution in the third chamber 13 will flow through the cation exchange membrane 15 into the fifth chamber 17 to increase the sodium ion content in the fifth chamber 17.

[0062] Setting up a fifth chamber 17 can reduce the generation of byproducts, avoid waste of raw materials, and improve the utilization rate of sodium-containing raw material solution.

[0063] In this embodiment, an anion exchange membrane 14 is disposed in the fifth chamber 17.

[0064] An anion exchange membrane 14 is provided in the fifth chamber 17 to divide the fifth chamber 17, that is, one half of the area is the side close to the third chamber 13, and the other half of the area is the side close to the negative electrode chamber.

[0065] The fifth chamber 17 contains a sodium hydroxide solution. When the control component 8 is activated, an electric field is applied to the displacement electrodialysis component 1. Hydroxide ions in the sodium hydroxide solution in the region near the negative electrode chamber are then permeated through the anion exchange membrane 14 under the action of the electric field and enter the region near the third chamber 13 to increase the concentration of hydroxide ions in that region.

[0066] A cation exchange membrane 15 is provided between half of the fifth chamber 17 and the third chamber 13. Under the action of an electric field, sodium ions in the sodium sulfide solution in the third chamber 13 will flow through the cation exchange membrane 15 into the fifth chamber 17 to increase the sodium ion content in the fifth chamber 17.

[0067] Setting an anion exchange membrane 14 in the fifth chamber 17 can increase the concentration of sodium hydroxide solution in the fifth chamber 17. While preparing lithium sulfide solution, the raw materials are not wasted, and a high concentration of sodium hydroxide solution is obtained, which improves the utilization rate of raw materials and reduces the production cost.

[0068] Please see Figure 1 In this embodiment, a sixth chamber 18, a seventh chamber 19, and an eighth chamber 20 are also provided on the side of the fifth chamber 17 away from the first chamber 11; the sixth chamber 18, the seventh chamber 19, and the eighth chamber 20 are arranged in a sequential array along the direction from the positive electrode chamber to the negative electrode chamber, and an anion exchange membrane 14 is provided between the fifth chamber 17 and the sixth chamber 18, a cation exchange membrane 15 is provided between the sixth chamber 18 and the seventh chamber 19, and an anion exchange membrane 14 is provided between the seventh chamber 19 and the eighth chamber 20;

[0069] The seventh chamber 19 is used to contain a lithium sulfide solution, the sixth chamber 18 is used to contain a lithium ion solution, and the eighth chamber 20 is used to contain a sulfide ion solution.

[0070] The lithium ion solution in the sixth chamber 18 is a lithium hydroxide solution, and the sulfide ion solution in the eighth chamber 20 is a sodium sulfide solution.

[0071] Under the control of the control component 8, lithium ions in the sixth chamber 18 and sulfur ions in the eighth chamber 20 pass through the cation exchange membrane 15 and the anion exchange membrane 14 respectively into the seventh chamber 19 to generate a lithium sulfide solution.

[0072] The sixth, seventh, and eighth chambers 20 are configured to operate in conjunction with the first, second, and third chambers 13 under the control of the control component 8 to prepare lithium sulfide solution, thereby improving the yield and production efficiency of the device and meeting the needs of continuous industrial production.

[0073] Simultaneously, a ninth chamber can be set between the eighth chamber 20 and the negative electrode chamber. The ninth chamber contains a sodium hydroxide solution and is separated by an anion exchange membrane 14. Under the action of the electric field, sodium ions in the sodium sulfide solution in the eighth chamber 20 pass through the cation exchange membrane 15 into the ninth chamber; hydroxide ions in the sodium hydroxide solution in the region of the ninth chamber near the negative electrode chamber flow into the other region of the ninth chamber, ultimately forming a high-concentration sodium hydroxide solution in the region of the ninth chamber near the eighth chamber 20.

[0074] Please see Figure 2 In this embodiment, it also includes: a circulating electrode liquid tank 31, an electrode liquid filter 32, a blower 33, and an electrode liquid pump 34;

[0075] The two ends of the circulating electrode liquid tank 31 are respectively connected to the two ends of the positive electrode chamber or the negative electrode chamber, and the electrode liquid filter 32 and the electrode liquid pump 34 are placed on the connecting pipeline, and the blower 33 is connected to the circulating electrode liquid tank 31.

[0076] The circulating electrode liquid tank 31 is a container used to store and circulate the electrode liquid required for the positive or negative electrode chamber. Both ends are connected to the positive or negative electrode chamber through pipelines to provide a stable electrolyte environment for the electrode reaction.

[0077] The circulating polar liquid tank 31 is made of PE material and has a capacity of 500L.

[0078] The electrode liquid filter 32 is used to filter suspended impurities in the electrode liquid to prevent these impurities from sticking to the anion and cation exchange membranes 15 and greatly reducing the permeability of anions and cations.

[0079] The blower 33 is connected to the circulating electrode liquid tank 31 to deliver inert gas (such as nitrogen) into the tank, preventing the electrode liquid from oxidizing and deteriorating and maintaining stable gas pressure inside the tank.

[0080] The polar liquid pump 34 is a corrosion-resistant pump with electric frequency control and soft start, providing power for the circulation of the polar liquid in the pipeline. A pipeline flow meter is also installed on the pipeline.

[0081] Driven by the electrode pump 34, the electrode liquid in the circulating electrode liquid tank 31 is transported along the pipeline to the positive electrode chamber or the negative electrode chamber, providing a stable electrolyte environment for the electrode reaction, ensuring a stable electric field strength, and thus ensuring a stable migration rate of lithium ions and sulfur ions.

[0082] Please see Figure 2 In this embodiment, it also includes: a lithium sulfide water tank 41, a lithium sulfide filter 42, and a lithium sulfide pump 43;

[0083] The two ends of the lithium sulfide water tank 41 are respectively connected to the two ends of the second chamber 12, and the lithium sulfide filter 42 and the lithium sulfide pump 43 are placed on the connecting pipeline.

[0084] During the lithium sulfide synthesis process, lithium ions and sulfur ions continuously react in the second chamber 12 to generate lithium sulfide, which may lead to a decrease in the liquid volume or an excessively high concentration in the chamber. At this time, the lithium sulfide pump 43 can transport the replenishing liquid (such as deionized water or low-concentration lithium sulfide solution) from the lithium sulfide tank 41 to the second chamber 12 through the pipeline to maintain a stable liquid volume and concentration in the chamber within the optimal reaction range, so as to continuously and rapidly generate lithium sulfide.

[0085] When the concentration of the lithium sulfide solution in the second chamber 12 reaches the required level, the lithium sulfide solution in the second chamber 12 is extracted by the lithium sulfide pump 43, and at the same time, replenishment solution is added to the second chamber 12 to maintain the reaction.

[0086] If the liquid in the second chamber 12 needs to be replaced, the waste liquid can also be discharged to the lithium sulfide water tank 41 for temporary storage via the lithium sulfide pump 43.

[0087] During the replenishment process, the lithium sulfide filter 42 can filter out solid impurities in the replenishment solution, preventing impurities from entering the second chamber 12 and affecting the purity of lithium sulfide or clogging the ion exchange membrane.

[0088] Please see Figure 2 In this embodiment, it also includes: a sulfur ion water tank 51, a sulfur ion filter 52, and a sulfur ion pump 53;

[0089] The two ends of the sulfur ion water tank 51 are respectively connected to the two ends of the third chamber 13, and the sulfur ion filter 52 and the sulfur ion pump 53 are placed on the connecting pipeline.

[0090] The sulfide ion tank 51 is a container for storing raw material liquid containing sulfide ions (such as sodium sulfide solution). Both ends are connected to the third chamber 13 through pipelines to continuously supply sulfide ion raw material to the third chamber 13.

[0091] Specifically, the sulfur ion pump 53 transports the sulfur-containing raw material liquid from the sulfur ion tank 51 along the pipeline to the third chamber 13, providing a continuous supply of sulfur ions to the third chamber 13. As sulfur ions migrate to the second chamber 12, the sulfur ion concentration in the third chamber 13 decreases. The sulfur ion pump 53 can adjust the delivery rate according to the concentration detection signal (such as sensor feedback) to maintain a stable sulfur ion concentration in the third chamber 13 and ensure a uniform migration rate of sulfur ions to the second chamber 12. During the transportation process, the sulfur ion filter 52 filters out solid impurities in the raw material liquid, preventing impurities from clogging the anion exchange membrane 14 between the third chamber 13 and the second chamber 12, ensuring smooth sulfur ion migration.

[0092] Please see Figure 2 In this embodiment, it also includes: a lithium ion water tank 61, a lithium ion filter 62, and a lithium ion pump 63;

[0093] The two ends of the lithium-ion water tank 61 are respectively connected to the two ends of the first chamber 11, and the lithium-ion filter 62 and the lithium-ion pump 63 are placed on the connecting pipeline.

[0094] The lithium-ion tank 61 stores a lithium hydroxide solution, which is used to supply lithium ions to the first chamber 11, ensuring that the lithium ions migrate stably to the second chamber 12 and react efficiently with sulfur ions to synthesize lithium sulfide, thus ensuring production continuity and synthesis efficiency.

[0095] In this embodiment, a sodium hydroxide tank 71, a filter 72, and a sodium hydroxide circulation pump 73 are also provided. The sodium hydroxide tank 71 is connected to the fourth, fifth, and eighth chambers 20 in the displacement electrodialysis assembly 1 via pipelines. The sodium hydroxide tank 71 contains sodium hydroxide solution, which is pumped into the fourth, fifth, and eighth chambers 20 by the sodium hydroxide circulation pump 73. Simultaneously, when the concentration of sodium hydroxide solution in the fourth, fifth, and eighth chambers 20 reaches a set value, it is pumped out for subsequent use.

[0096] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this utility model, this should not limit the scope of patent protection of this utility model. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this utility model and utilizing the content described in the text and drawings of this utility model, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this utility model.

Claims

1. A displacement electrodialysis device for the preparation of lithium sulfide in the new energy field, characterized in that, include: A displacement electrodialysis assembly includes: a positive electrode chamber, a negative electrode chamber, a first chamber, a second chamber, a third chamber, multiple anion exchange membranes, and multiple cation exchange membranes. The positive electrode chamber and the negative electrode chamber are arranged opposite to each other. The first chamber, the second chamber, and the third chamber are arranged in a sequential array along the direction from the positive electrode chamber to the negative electrode chamber. The second chamber is used to contain a lithium sulfide solution, the first chamber is used to contain a lithium ion solution, and the third chamber is used to contain a sulfide ion solution. The cation exchange membrane is placed between the first chamber and the second chamber, and the anion exchange membrane is placed between the second chamber and the third chamber. A control component, the two ends of which are electrically connected to the positive electrode chamber and the negative electrode chamber, respectively.

2. The displacement electrodialysis device for lithium sulfide preparation in the new energy field according to claim 1, characterized in that, Also includes: A fourth chamber is located between the positive electrode chamber and the first chamber, and an anion exchange membrane is provided between the fourth chamber and the first chamber. The fourth chamber is used to absorb anions from the first chamber.

3. The displacement electrodialysis device for lithium sulfide preparation in the new energy field according to claim 2, characterized in that, A cation exchange membrane is installed in the fourth chamber.

4. The displacement electrodialysis apparatus for lithium sulfide preparation in the new energy field according to any one of claims 1 to 3, characterized in that, Also includes: A fifth chamber is located between the negative electrode chamber and the third chamber, and a cation exchange membrane is provided between the fifth chamber and the third chamber. The fifth chamber is used to absorb cations from the third chamber.

5. The displacement electrodialysis device for lithium sulfide preparation in the new energy field according to claim 4, characterized in that, An anion exchange membrane is installed in the fifth chamber.

6. The displacement electrodialysis apparatus for lithium sulfide preparation in the new energy field according to claim 5, characterized in that, The fifth chamber is further provided with a sixth chamber, a seventh chamber, and an eighth chamber on the side away from the first chamber; the sixth chamber, the seventh chamber, and the eighth chamber are arranged in a sequential array along the direction from the positive electrode chamber to the negative electrode chamber, and an anion exchange membrane is provided between the fifth chamber and the sixth chamber, a cation exchange membrane is provided between the sixth chamber and the seventh chamber, and an anion exchange membrane is provided between the seventh chamber and the eighth chamber; The seventh chamber is used to contain a lithium sulfide solution, the sixth chamber is used to contain a lithium ion solution, and the eighth chamber is used to contain a sulfide ion solution.

7. The displacement electrodialysis device for lithium sulfide preparation in the new energy field according to claim 1, characterized in that, Also includes: Circulating electrode liquid tank, electrode liquid filter, blower, and electrode liquid pump; The two ends of the circulating electrode tank are respectively connected to the two ends of the positive electrode chamber or the negative electrode chamber, and the electrode filter and the electrode pump are placed on the connecting pipeline, and the blower is connected to the circulating electrode tank.

8. The displacement electrodialysis apparatus for lithium sulfide preparation in the new energy field according to claim 1, characterized in that, Also includes: Lithium sulfide water tank, lithium sulfide filter, and lithium sulfide pump; The two ends of the lithium sulfide water tank are respectively connected to the two ends of the second chamber, and the lithium sulfide filter and the lithium sulfide pump are placed on the connecting pipeline.

9. The displacement electrodialysis device for lithium sulfide preparation in the new energy field according to claim 1, characterized in that, It also includes: a sulfur ion water tank, a sulfur ion filter, and a sulfur ion pump; The two ends of the sulfur ion water tank are respectively connected to the two ends of the third chamber, and the sulfur ion filter and sulfur ion pump are placed on the connecting pipeline.

10. The displacement electrodialysis apparatus for lithium sulfide preparation in the new energy field according to claim 1, characterized in that, Also includes: Lithium-ion water tanks, lithium-ion filters, and lithium-ion pumps; The two ends of the lithium-ion water tank are respectively connected to the two ends of the first chamber, and the lithium-ion filter and the lithium-ion pump are placed on the connecting pipeline.

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