454results about "Lithium compounds" patented technology

The invention discloses high-purity lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the step that lithium hydride, lithium hydroxide and a sulfur source are subjected to a heating reaction in a dry inert atmosphere, and the high-purity lithium sulfide is obtained. The molar ratio of lithium hydride to lithium hydroxide is X: (10-X), and X is 1-6. The invention also discloses the prepared high-purity lithium sulfide and application of the high-purity lithium sulfide in preparation of sulfide solid electrolyte. Lithium hydroxide and lithium hydride are mixed to serve as a lithium source in lithium sulfide preparation, the lithium hydroxide quickly and uniformly reaches the reaction temperature by means of the characteristic that the lithium hydride reacts with a sulfur source to release heat and produce gas, the lithium hydride reacts to produce gas, meanwhile, discharging of product water vapor is facilitated, and oxygen in the environment is isolated; and hardening and generation of a side reaction product lithium sulfate are prevented, the conversion rate of lithium hydroxide to lithium sulfide is improved, and the raw material and process cost for preparing lithium sulfide is remarkably reduced.

The invention relates to the technical field of battery raw materials, in particular to a preparation method of lithium sulfide powder, the lithium sulfide powder and application, and the preparation method comprises the following steps: uniformly mixing lithium sulfate and a carbon source according to a preset proportion to obtain a first mixture; performing first heat treatment on the first mixture in inert gas to obtain a second mixture; and performing second heat treatment on the second mixture in reducing gas to obtain the lithium sulfide powder. The product obtained by the preparation method disclosed by the invention is the lithium sulfide powder, and the obtained lithium sulfide powder has the advantages of less oxygen and carbon impurities, higher purity and high reaction activity, and meets the synthesis requirements of the electrolyte; according to the preparation method, in the process of preparing lithium sulfide, toxic gas and organic solvent are not used, the reaction temperature is low, the energy consumption is low, the requirement on production equipment is low, the process is simple, the cost is low, harmful gas emission is avoided, safety and environment friendliness are achieved, and industrialization is easy to achieve.

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and application. The chemical formula of the sulfide solid electrolyte is Li7-aPS6-aXa, X is halogen, and a is greater than or equal to 1 and less than or equal to 2; wherein the peak area of a diffraction peak corresponding to a (111) crystal plane of the sulfide solid electrolyte is I1, the peak area of a diffraction peak corresponding to a (311) crystal plane of the sulfide solid electrolyte is I2, and I1 / I2 is larger than or equal to 0.2 and smaller than or equal to 0.3. The I1 / I2 of the sulfide solid electrolyte disclosed by the invention is within the range, a good crystal structure and a relatively large interface area can be provided, and ion movement is promoted, so that relatively high ionic conductivity is obtained. Furthermore, according to the method disclosed by the invention, the high ionic conductivity of the product is ensured by reducing the solvent dosage and optimizing the sintering step, and meanwhile, the environmental pollution, the energy consumption and the production cost are remarkably reduced.

The invention provides a sulfide solid electrolyte and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, carrying out dry ball milling treatment on raw materials Li2S, P2S5 and LiX according to a required stoichiometric ratio, so that the raw materials are amorphized; s2, adding a solvent into the non-crystallized raw material obtained in the step S1, and carrying out wet ball-milling treatment to obtain a precursor with the particle size of 0.05-0.5 mu m; s3, the solvent is removed from the precursor slurry, the sulfide solid electrolyte is obtained through solid-phase sintering, all the steps are carried out in an inert atmosphere, and X is a halogen element. According to the present invention, the non-crystallization of the raw material is achieved through the dry ball milling, the uniform precursor slurry with the small particle size is obtained by combining the wet ball milling, and the sub-micron / nano-scale pure phase electrolyte material can be obtained after the sintering treatment, such that the electrode / electrolyte interface contact is improved, the impedance is reduced, and the battery performance is significantly improved.

The invention discloses a hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

The invention belongs to the technical field of electrolyte, and particularly relates to a method for preparing liquid lithium hexafluorophosphate from sodium hexafluorophosphate. The method comprises the following steps: adding a sodium source into a hexafluorophosphoric acid aqueous solution for neutralization reaction to obtain a sodium hexafluorophosphate aqueous solution, then extracting to remove water, drying to obtain a sodium hexafluorophosphate solid, and heating and decomposing the sodium hexafluorophosphate solid to obtain phosphorus pentafluoride gas; the phosphorus pentafluoride gas is not mixed with SO3, POF3, HF and other impurity gases, a complex refining and purifying process is not needed, and the phosphorus pentafluoride gas with the purity exceeding 99.9% can be obtained after simple purification and can be directly used for synthesizing liquid lithium hexafluorophosphate. The method does not generate waste acid, does not need a complicated phosphorus pentafluoride gas purification process, is particularly suitable for the requirements of the lithium battery industry on high-purity electrolyte, and has the remarkable advantages of high product purity, small environmental pollution, low production cost and the like.

The utility model discloses a salt lake lithium extraction adsorbent scrubbing system which comprises a scrubbing tower and an adsorption tower, and a sunken water distributor is arranged at the bottom end in the scrubbing tower; the middle position of the bottom of the concave water distributor penetrates through the bottom of the scrubbing tower and is connected with a runner opening; a water replenishing opening is formed in the middle of the bottom of the scrubbing tower; two feed ports are formed in the positions, close to the water inlet, of one side of the scrubbing tower, and a water outlet is formed in the position, close to the top, of one side of the scrubbing tower; the flow channel port is sequentially connected with a pneumatic valve j, a diaphragm pump B and an adsorption column through a pipeline; according to the system, crushed resin particles and impurities are effectively removed by cleaning an adsorbent, so that the adsorption performance and the flowability of a resin bed layer are recovered, and it is ensured that the resin bed layer is always in the optimal working state. In the process of scrubbing the adsorbent, the adsorbent does not need to be manually carried except for necessary adsorption tower pipeline connection operation, so that the scrubbing efficiency is remarkably improved.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte and an all-solid-state lithium battery, the chemical formula of the sulfide solid electrolyte is Li < 7-2x-y > PMxS < 6-x-y > OxCl < 0.7-y > Br < 0.3 y >, M is at least one of Ca, Mg and Cu, x is more than or equal to 0.01 and less than or equal to 0.3, y is more than or equal to 0.5 and less than or equal to 2, x / y is more than or equal to 0.008 and less than or equal to 0.24, the molar ratio of the element M to the element O is 1: 1, and the molar ratio of the element Cl to the element Br is 7: 3; the grain boundary impedance of the sulfide solid electrolyte at 25 DEG C is 20 Omega to 100 Omega. Through the arrangement, the sulfide solid electrolyte disclosed by the invention has relatively low grain boundary impedance while maintaining high ionic conductivity and good air stability. Furthermore, when the sulfide solid electrolyte is applied to the all-solid-state lithium battery, the electrochemical performance of the all-solid-state lithium battery can be improved.

The application relates to the field of electrochemistry, and provides a sulfide solid electrolyte and a full-solid-state lithium battery. The chemical formula of the sulfide solid electrolyte is Li 7+3x‑y P 1‑x M x S 6‑x‑y O x Cl 0.7y Br 0.3y , M is at least one of Ca, Mg and Cu, 0.01<=x<=0.3, 0.5<=y<=2, 0.008<=x / y<=0.24; the fracture toughness of the sulfide solid electrolyte is 0.8 MPa.m 1 / 2 2.5 MPa.m 1 / 2 . Through the above setting, the fracture toughness of the sulfide solid electrolyte is significantly improved, the sulfide solid electrolyte of the application can also maintain high ionic conductivity and good air stability, the synergistic optimization between mechanical reliability and electrochemical performance of the sulfide solid electrolyte is realized, and the electrochemical performance of the full-solid-state lithium battery is improved.

The invention provides a treatment method for removing EDTA-Ca in a high-salt and high-chlorine lithium-containing mother solution, and belongs to the technical field of lithium salt preparation. The treatment method sequentially comprises the following steps: S100, adjusting the pH value of the lithium-containing mother liquor to be treated to be acidic, and stirring to react for a period of time; s200, after stirring reaction, standing for a period of time, filtering to remove precipitate, and collecting filtrate; s300, adjusting the pH value of the filtrate to be alkaline, adding an oxidizing agent, and stirring to react for a period of time; and S400, heating for a period of time after stirring reaction, filtering to remove precipitate, and collecting filtrate to obtain treated lithium-containing mother liquor. The treatment method can effectively break complexation of EDTA-Ca in the high-salt and high-chlorine lithium-containing mother liquor, effectively remove calcium ions and reduce the EDTA content and solution complexation ability, and has the advantages of less lithium ion loss, low cost, simple and safe process and less impurity introduction.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte and an all-solid-state lithium battery, the chemical formula of the sulfide solid electrolyte is Li < 7 + 3x-y > P < 1-x > M < x > S < 6-x-y > O < x > Cl < 0.7 y > Br < 0.3 y >, M is at least one of Ca, Mg and Cu, x is more than or equal to 0.01 and less than or equal to 0.3, y is more than or equal to 0.5 and less than or equal to 2, and x / y is more than or equal to 0.008 and less than or equal to 0.24; the fracture toughness of the sulfide solid electrolyte is 0.8 MPa.m < 1 / 2 > to 2.5 MPa.m < 1 / 2 >. Through the arrangement, the fracture toughness of the sulfide solid-state electrolyte is remarkably improved, and the sulfide solid-state electrolyte disclosed by the invention also can maintain relatively high ionic conductivity and good air stability, so that collaborative optimization of the sulfide solid-state electrolyte between mechanical reliability and electrochemical performance is realized; further, the electrochemical performance of the all-solid-state lithium battery is improved.

The application relates to the field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and an application. 7‑ A PS 6‑A X A The application also provides a sulfide solid electrolyte selected from any one of compounds of a chemical formula Li 7‑ A PS 6‑A X A X is halogen, and 1<=A<=2; wherein the sulfide solid electrolyte has a fracture toughness of 0.5-2 MPa m 1 / 2 The sulfide solid electrolyte has high fracture toughness and ionic conductivity. Further, the preparation method controls the particle size of a substrate, reduces the solvent consumption and optimizes the sintering step, thereby improving the fracture toughness, high purity and high ionic conductivity of the product, and significantly reducing environmental pollution, energy consumption and production cost.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and application. The sulfide solid electrolyte disclosed by the invention is selected from any one of a compound with a chemical formula of Li7-APS6-AXA and a Li7-APS6-AXA compound coated or doped with other elements, X is halogen, and A is greater than or equal to 1 and less than or equal to 2; wherein the fracture toughness of the sulfide solid electrolyte is 0.5-2 MPa m < 1 / 2 >. The sulfide solid electrolyte disclosed by the invention has relatively high fracture toughness and ionic conductivity. Furthermore, according to the preparation method disclosed by the invention, by controlling the particle size of the substrate, reducing the solvent dosage and optimizing the sintering step, the fracture toughness, high purity and high ionic conductivity of the product are improved, and meanwhile, the environmental pollution, the energy consumption and the production cost are remarkably reduced.

The invention discloses a preparation method of a sulfide solid electrolyte, and relates to the field of solid-state batteries, the preparation method comprises the following steps: preparing Li2S-coated LiCl core-shell nanoparticles, and carrying out airflow collision grinding on the Li2S-coated LiCl core-shell nanoparticles and P2S5 nanopowder to obtain composite powder; the composite powder is placed in a reaction furnace for heating deposition, then heating crystallization is carried out, and Li6PS5Cl nanoparticles are obtained; the Li6PS5Cl nanoparticles are placed in a ball milling tank to be treated, then annealing treatment is conducted, and the sulfide solid electrolyte is obtained after treatment is completed. Through combination of the core-shell structure precursor and the vapor deposition technology, the core contradiction that nanocrystallization and high ionic conductivity are difficult to consider at the same time in the sulfide solid electrolyte field is effectively solved, and the problems of interface contact defects caused by micron-sized particles and crystal defects caused by mechanical refinement in a traditional process are effectively solved; the problem is solved through construction of Li2S-coated LiCl core-shell nanoparticles and activation treatment of airflow on collision and grinding.

The invention provides a modified separation membrane as well as a preparation method and application thereof, the preparation method of the modified separation membrane comprises the following steps: obtaining a mixed system of a mineral aggregate and a polar solvent, performing ultrasonic liquid phase stripping on the mixed system to obtain a to-be-treated liquid, and the mass volume ratio of the mineral aggregate to the polar solvent is (50-100) mg: (30-60) ml; performing centrifugal treatment on the to-be-treated liquid, and collecting supernatant liquid to obtain nano suspension liquid; a cross-linking agent is mixed with the nano suspension to obtain modified liquid, the modified liquid contains the modified nanosheets, and the mass of the cross-linking agent is 2%-30% of the mass of the mineral aggregate; the modified liquid is filtered through a filter membrane, the modified nanosheets are evenly loaded on the surface of the filter membrane, and the modified separation membrane is prepared. The modified separation membrane prepared by the invention is a modified separation membrane material with high separation coefficient, high rejection rate and high flux, and has excellent performance.

The application belongs to the technical field of porous adsorption membrane materials, and discloses a titanium lithium ion porous adsorption membrane material and a self-assembly preparation method and application thereof. The preparation method comprises the following steps: dissolving a film-forming polymer in a dispersion liquid containing MXene nanosheets to form a uniform precursor liquid; the MXene nanosheet is a carbide, nitride or carbonitride of a transition metal with a single-layer structure; dispersing a titanium lithium composite oxide in the precursor liquid to form a casting solution; coating the casting solution on a support, and then performing phase inversion by using pure water to obtain a matrix film; placing the matrix film in a lithium elution liquid for immersion washing, replacing lithium ions in the matrix film, and causing a self-assembly reaction of the titanium lithium composite oxide in the matrix film, so that the titanium lithium ion porous adsorption membrane material is obtained. The application innovatively introduces MXene nanosheets and a polysulfone matrix film, fixes the MXene nanosheets on the polysulfone matrix film as an in-situ growth substrate of the titanium lithium composite oxide, and the obtained membrane material has a high adsorption capacity.

The invention provides a sulfide electrolyte material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing lithium sulfide, phosphorus pentasulfide, rare earth sulfide and a solvent, and reacting to obtain a sulfide electrolyte precursor; and carrying out pressing treatment on the sulfide electrolyte precursor, and carrying out low-temperature sintering on the material obtained by pressing at 250-500 DEG C to obtain the sulfide electrolyte material. According to the method disclosed by the invention, the synthesis of the rare earth element doped sulfide precursor is realized by adopting a pure liquid phase method, particles are dispersed in a liquid phase solvent, and the particle uniformity and dispersity of the obtained finished product are obviously superior to those of a solid phase method. After the precursor obtained by the liquid phase method is pressed and sintered at low temperature, the crystal boundary between crystals of the electrolyte material is relatively small, the energy barrier of ion transmission is remarkably enhanced, the conductivity of the electrolyte is optimized, and the long-cycle stability of the all-solid-state battery is improved.

The invention relates to a method for producing solid lithium salt through extraction-liquid-liquid-solid three-phase reverse extraction from a lithium-containing solution, which comprises the following steps: (1) mixing the lithium-containing solution with a composite extraction agent, and carrying out extraction treatment to obtain a lithium-loaded first organic phase and a raffinate phase; (2) carrying out impurity removal treatment on the first organic phase to obtain a second organic phase; and (3) mixing the second organic phase with a stripping agent, carrying out stripping treatment to obtain an oil-water-solid three-phase mixed phase containing solid lithium salt, and carrying out phase separation on the mixed phase to obtain the solid lithium salt, wherein the stripping agent is an acid solution containing a lithium salt solid. According to the method, efficient separation of lithium and a large number of impurities is achieved through extraction and washing treatment, the solid lithium salt is directly obtained after reverse extraction treatment, the battery-grade solid lithium salt product can be obtained after impurity removal treatment, and the method has the advantages of being simple in preparation technology, short in process, high in product purity and low in production cost.

The invention discloses a modified solid-state electrolyte and a preparation method and application thereof, and relates to the field of solid-state batteries, in 300 crystal face grain size distribution of the modified solid-state electrolyte, Kn90 = (Ln90-Ln10) / Ln50, and Kn90 is more than or equal to 0.5 and less than or equal to 1.7; wherein Ln10 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 10%, and Ln50 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 50%; ln90 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 90%. According to the invention, the modified solid electrolyte has excellent ionic conductivity, good air stability, interface stability to metal lithium and relatively high oxidation potential stability.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid-state electrolyte and an all-solid-state lithium battery, the chemical formula of the sulfide solid-state electrolyte is Li < 7 + x-y > P < 1-x > M < x > S6-2x-y > O < 2x > X < y >, M is at least one of variable valence rare earth elements Ce, Eu, Pr and Sm, X is at least one of halogens, 0.002 < = x < = 0.3, 0.5 < = y < = 1.4, the molar ratio of the element M to the element O is 1: 2, and the molar ratio of the element O to the M is 1: 2. The unit cell parameters of the sulfide solid electrolyte meet the following conditions: a = b = c = 9.85-10, and the ionic conductivity of the sulfide solid electrolyte is greater than 8mS / cm. Through the arrangement, the sulfide solid electrolyte disclosed by the invention has good structural stability and oxidation-reduction resistance, and also has good air stability and ionic conductivity, so that longer cycle life and stronger voltage resistance of the all-solid-state lithium battery are realized.

The invention discloses a preparation method and application of a monovalent cation selective membrane for efficient lithium-magnesium separation, and belongs to the technical field of preparation of cation selective membranes. The monovalent cation selective membrane is composed of a polyamide nanofiltration base membrane and a polyethyleneimine positive electricity layer, and the preparation method comprises the following steps: taking piperazine anhydrous as a water phase concentration and trimesoyl chloride as an oil phase monomer, reacting on a polyethersulfone ultrafiltration base membrane, and preparing the polyamide nanofiltration base membrane by utilizing an interfacial polymerization method; and anchoring on the surface of the polyamide nanofiltration base membrane by utilizing cross-linking of gallic acid and PEI with the molecular weight of about 70000 through a multi-layer deposition method to obtain the Gallic-PEI / polyamide composite membrane with the positively charged surface. The membrane can realize lithium-magnesium separation through pore size screening and electrostatic repulsion effect, and has high lithium-magnesium selectivity while maintaining large lithium ion flux in the application process of an electrodialysis system, so that the lithium-magnesium separation effect of salt lake brine is improved.

The application relates to the field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and an application. The chemical formula of the sulfide solid electrolyte is Li 7‑a PS 6‑a X a , X is at least one selected from Cl, Br and I, 1<=a<=2; the sulfide solid electrolyte powder is composed of large particles and small particles, and the small particles exist on the large particles; characterized in that the particle size of the large particles is 3-20 mu m, the particle size of the small particles is 0.2-0.8 mu m; the number of the large particles accounts for 5-10% of the total particle number, and the number of the small particles accounts for 90-95% of the total particle number. The preparation method optimizes the powder structure and particle size distribution of the sulfide solid electrolyte, improves the ionic conductivity of the sulfide solid electrolyte, improves the solvent residue problem, simplifies the preparation process of the sulfide solid electrolyte, and simultaneously reduces the production cost.

The invention discloses a separation nanofiltration membrane and a preparation method and application thereof.According to the preparation method, sulfonyl chloride is added into an organic phase of an interfacial polymerization reaction, and the interfacial polymerization reaction is interfered through the sulfonyl chloride, so that the positive charge density of the surface of the nanofiltration membrane is improved; inorganic base is adopted as a water-phase buffering agent, so that a relatively large membrane pore originally caused by competition of organic-phase monomers is shrunk; in order to compensate adverse effects caused by addition of sodium carbonate, membrane pores can be further reduced and the positive charge density on the surface of the membrane can be improved by subsequently adopting secondary grafting of polyamine monomers, so that mineral ion interception and improvement of lithium-magnesium separation characteristics are realized. In conclusion, the preparation method disclosed by the invention adopts a synergistic mechanism of water-phase buffering, organic-phase sulfonyl chloride and secondary grafting of the polyamine monomer, so that the effective pore diameter and the surface charge density of the membrane are well balanced, and the prepared nanofiltration membrane shows good positive electricity effect, water permeability and lithium-magnesium separation performance; the method has the potential of being applied to the field of lithium resource extraction.

The invention discloses a synthesis method of lithium phosphorus sulfur chloride, and relates to the technical field of preparation of sulfide solid electrolyte for all-solid-state lithium ion batteries, and the scheme is as follows: the synthesis method of lithium phosphorus sulfur chloride comprises the following steps: pretreatment of raw materials: mixing lithium carbonate (Li2CO3), phosphorus pentasulfide (P2S5), lithium chloride (LiCl) and elemental sulfur (S) according to a preset ratio, and then adding a catalyst, grinding and dispersing for a preset time to obtain uniformly dispersed mixed powder; reduction reaction: fully mixing the mixed powder with a reducing agent, heating to a first preset temperature condition, and carrying out reduction reaction to obtain a reduction product; sintering and purifying: heating the reduction product to a second preset temperature, and sintering to form a lithium phosphorus sulfur chloride (Li6PS5Cl) crystal phase to obtain a lithium phosphorus sulfur chloride (Li6PS5Cl) product; the raw material cost can be remarkably reduced, the process safety and economy are optimized, and large-scale industrial preparation of lithium phosphorus sulfur chlorine is realized.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and application. The chemical formula of the sulfide solid electrolyte is Li7-aPS6-aXa, X is selected from at least one of Cl, Br and I, and a is greater than or equal to 1 and less than or equal to 2; wherein the sulfide solid electrolyte comprises carbon generated in situ in the synthesis process, the content of the carbon is M, and M is more than or equal to 0.03 wt% and less than or equal to 0.5 wt%. According to the method disclosed by the invention, the inert solvent is used and the solvent dosage is reduced, so that the introduction of oxygen and carbon impurities is reduced, the high purity and high ionic conductivity of the product are ensured, and meanwhile, the environmental pollution, the energy consumption and the production cost are remarkably reduced.

The invention discloses a preparation method and application of a plasma-assisted gradient doped sulfide solid electrolyte, and belongs to the technical field of preparation of solid-state battery materials. According to the method, four-order synergistic processes of plasma activation, gradient doping, microwave sintering and supercritical purification are combined, atomic-scale mixing is achieved through plasma-assisted ball milling, a gradient Cl doping process is combined to optimize a crystal structure, energy consumption is reduced by 70% through microwave sintering, and the product purity is improved to 99.5% by adopting a supercritical carbon dioxide purification technology. The corollary equipment integrates a corrosion-resistant ball milling bin, a high-precision microwave module and an online detection system, and is suitable for large-scale production, the ionic conductivity reaches 6.4 mS / cm, the cycle performance is improved by 150%, the continuous production process only needs 3 h, and compared with the traditional process which needs more than 12 h, the efficiency is improved by 400%.

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method of a self-supporting polypyrrole composite membrane and application of the self-supporting polypyrrole composite membrane in extraction of lithium from a salt lake. A polyoxazole polyhydrazide copolymer is used as a porous self-supporting base membrane, and a continuous polypyrrole functional layer is constructed on the surface of the base membrane through in-situ oxidative polymerization. A dynamic charge screening microenvironment is formed by a weak positive electricity characteristic and a highly conjugated structure in a polypyrrole molecular chain, and the interception efficiency on high-charge-density magnesium ions is enhanced through electrostatic interaction; and meanwhile, the rigid pore structure realizes selective permeation of lithium ions through size screening. Under the assistance of an external electric field, the polypyrrole layer shows excellent magnesium-lithium separation performance, lithium ions are enriched and recycled from the salt lake brine with the high Mg < 2 + > / Li < + > molar ratio, and the industrial bottleneck that ion flux and selectivity are difficult to consider at the same time in a traditional separation technology is solved.

A solid electrolyte contains Li, M, Si, and F, where M is an element serving as a cation. It is preferable that M may be an element serving as a trivalent cation and that the solid electrolyte may contain a component expressed by a composition formula of LiaMbSicFd, the composition formula satisfying 0.9(3-x) ≤ a ≤ 1.1(3-x), 0.9(1-x) ≤ b ≤ 1.1(1-x), 0.9x ≤ c ≤ 1.1x, 5.4 ≤ d ≤ 6.6, and 0 < x < 1.

The present invention relates to a production method of a solid electrolyte in which adopting a liquid-phase method, a solid electrolyte having a high ionic conductivity, in which the generation of hydrogen sulfide is suppressed, the method including mixing a raw material inclusion containing a lithium element, a sulfur element, a phosphorus element, and a halogen element with a complexing agent containing a compound having at least two tertiary amino groups in the molecule; and an electrolyte precursor constituted of a lithium element, a sulfur element, a phosphorus element, a halogen element, and a complexing agent containing a compound having at least two tertiary amino groups in the molecule.