43 results about "Desolvation" patented technology

The invention provides a low-temperature sodium-ion battery containing a modified negative electrode as well as a preparation method and application of the low-temperature sodium-ion battery. The low-temperature sodium-ion battery comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises negative electrode slurry, and the negative electrode slurry comprises an active substance, conductive carbon, sodium carboxymethyl cellulose and butadiene styrene rubber; the active substance comprises modified hard carbon; the modified hard carbon is prepared by oscillating and mixing hard carbon with a single-walled carbon nanotube, graphite carbon and soft carbon to obtain physical coating, further oscillating and mixing with the doped modified precursor powder, and calcining at high temperature to complete element doping and chemical coating; and the electrolyte comprises an additive selected from trimethylsilyl nicotinate, methyl 4-hydroxy-3-methoxycinnamate and the like. On one hand, the adhesive force of the negative electrode slurry on the current collector is improved, on the other hand, the solvent formula is optimized, the desolvation ability of sodium ions in the electrolyte is improved, the viscosity is reduced, and the additive is added to modify an electrode surface interface film, so that the charge-discharge performance of the battery at low temperature is improved.

The invention discloses an artificial SEI material and a preparation method and application thereof, and a battery rate capability evaluation method, the artificial SEI material comprises a polymer, the polymer is formed by polymerizing at least one cyclic carbonate monomer and at least one hydrophobic solvent type monomer, and the ionic conductivity of the artificial SEI material is 3 * 10 <-5 > S / cm to 7.2 * 10 <-5 > S / cm. The artificial SEI material is prepared by carrying out polymerization reaction on a cyclic carbonate monomer and a hydrophobic solvent type monomer. The high-polarity carbonyl functional group in the cyclic carbonate unit can selectively react with lithium ions, so that a solvation sheath is weakened, a desolvation energy barrier is reduced, and the transmission efficiency of the lithium ions is improved. And the hydrophobic solvent type monomer unit forms a polymer skeleton which is insoluble in the electrolyte, so that the chemical stability is ensured. The copolymer has high ionic conductivity and structural stability, and provides a material basis for improving the fast charging performance of the lithium ion battery.

The present application relates to the field of pesticide chemical industry technology, and discloses a post-treatment method for a saflufenacil-containing reaction solution. The post-treatment method includes the following steps: (1) after phase separation of a saflufenacil-containing reaction solution, performing desolvation treatment on an organic phase, and then adding a first organic solvent for stirring; (2) after the stirring is completed, performing filtration, leaching an obtained filter cake with a second organic solvent, and obtaining saflufenacil after drying. The post-treatment method provided by the present application can simply and efficiently treat the saflufenacil-containing reaction solution, with a product yield of over 90% and a content of about 98%.

A heating device and a mass spectrometry device of a nanoelectrospray source, the heating device comprising: a support body and a heating body arranged on the support body, the heating body being configured to apply a heating effect to an ion transmission path and being provided with an ion transmission channel for the passage of ions or charged droplets; an ion inlet of the ion transmission channel corresponding to an ion outlet of the nanoelectrospray source, and an ion outlet of the ion transmission channel corresponding to an ion inlet of the mass spectrometer. The heating device can significantly improve the atomization and desolvation capability of the nanoelectrospray source, improve the signal response and repeatability, reduce the ion cluster background noise formed by solvent molecules, improve the sensitivity, and avoid the spray stop and signal loss caused by the heat-sensitive drying of the nanoelectrospray ion source at the end of the spray needle.

The invention relates to the technical field of crystal structure prediction, and discloses a quantum algorithm-based energetic CxNyOz crystal structure prediction method, which comprises the following steps of: calculating an evaporation and diffusion dimensionless number and capillary pressure by obtaining surface tension, a contact angle, a geometric feature scale, temperature, partial pressure, a diffusion coefficient and an evaporation rate; establishing a residual solvent mole fraction and solvent chemical potential sequence; constructing a binary layer occupancy model Hamiltonian containing layer occupancy energy, adjacent layer action energy, a capillary pressure volume term and a molecular polarity action term, and obtaining a hierarchical occupancy number by using a quantum approximation optimization algorithm; calculating interlayer respiration and shear frequency and mode volume sensitivity based on a quantum variation algorithm; and finally, the lattice spacing and the prediction result are obtained through cost functional minimization, and accurate prediction and quantitative analysis of the structure of the energetic crystal under the unbalanced desolvation condition are realized.

The invention relates to preparation and application of an adsorption material and device for alkane substances released by flowering of plants and a perfuming material. Attapulgite powder which is low in cost and easy to obtain is selected as an adsorption material for C12-C17 intermediate alkane emitted during flowering of plants, and rotary evaporation is performed for 10-20 h under the conditions that the temperature is 50-70 DEG C and the pressure is-0.12--0.08 MPa, so that micropores and spaces are increased, and the adsorption efficiency is improved. The material can be directly applied after adsorption, procedures of elution, concentration and desolvation of solvents such as ethanol are omitted, efficiency is improved, pollution is reduced, resources are saved, and more intermediate alkane substances are reserved. In addition, three application modes are found in cigarettes, the effect is clear, the cigarette quality can be improved, and high-value utilization of plant resources is achieved.

The invention provides a continuous forming and gradient flooding method and device for a spherical energetic material. The method comprises the following steps: forming liquid medicine into uniform micro-drops through a micro-channel device, and sequentially feeding the uniform micro-drops into three stirring kettles which are connected in series: curing and forming in a first stirring kettle at 5-25 DEG C, overflowing into a second stirring kettle, carrying out low-temperature flooding at 40-60 DEG C so as to remove more than 80% of solvent, overflowing into a third stirring kettle, and completing high-temperature deep flooding at 70-90 DEG C, and finally cooling to room temperature through a cooling device. And the three stirring kettles realize continuous transfer through an overflow structure, and manual intervention is not needed. The device comprises a metering pump, a micro-channel device, three stirring kettles connected in series and a cooling device. Through the gradient strategy of low-temperature pre-desolvation and high-temperature deep desolvation, the contradiction between particle softening deformation and solvent residue in the traditional process is solved, the particle size distribution deviation of the spherical energetic material is smaller than or equal to 5%, the deformation rate is smaller than or equal to 2%, the solvent residue is smaller than or equal to 50 ppm, the production continuity is improved by 40% or above, and the method is particularly suitable for continuous production of temperature-sensitive energetic drugs.

The invention discloses a linear ether and cyclic ether mixed electrolyte for a wide-temperature-range sodium-ion battery as well as a preparation method and application of the linear ether and cyclic ether mixed electrolyte, and relates to a wide-temperature-range electrolyte as well as a preparation method and application of the wide-temperature-range electrolyte. The invention discloses a linear ether and cyclic ether mixed electrolyte for a wide-temperature-range sodium-ion battery. The linear ether and cyclic ether mixed electrolyte comprises sodium salt and an ether-based solvent, the sodium salt is sodium trifluoromethanesulfonate; the ether-based solvent is a mixed solution of straight-chain ether and cyclic ether; the straight-chain ether is diethylene glycol dimethyl ether; the cyclic ether is tetrahydrofuran or dimethyl tetrahydrofuran. The straight-chain ether and cyclic ether mixed electrolyte of the wide-temperature-range sodium-ion battery provided by the invention has a low freezing point, low viscosity, high ionic conductivity and high sodium ion transference number in a wide temperature range, and low desolvation energy, and can reduce the interface charge transfer impedance of an electrode-electrolyte, so that the performance of the battery is improved. Sodium ions can be quickly embedded and separated when reaching the electrode, so that the wide-temperature-range performance of the sodium ion battery is improved, and the sodium ion battery has excellent wide-temperature-range charge-discharge specific capacity, cycling stability and high-rate performance.

The embodiment of the invention discloses an electrolyte, a battery and an electric device. The electrolyte includes an aprotic organic solvent and an alkali metal salt dissolved therein, the aprotic organic solvent including: a cyclic ester that imparts excellent thermal stability and chemical stability with low ring tension and a stable conjugated structure; straight-chain ether is used for reducing the viscosity of the system and promoting ion transmission; and the weak coordination characteristic of the low-donor-number solvent (DN is less than or equal to 18) promotes more anions to enter a first solvation sheath of Li < + >, so that an anion-dominated solvation structure is formed, the desolvation energy barrier of lithium ions on an electrode interface is reduced, charge transfer is accelerated, and electrochemical polarization is reduced. The solvated structure induces to form a compact and stable SEI film rich in LiF and other high-ionic-conductivity inorganic components at the same time, side reaction is inhibited, deposition / dissolution kinetics of vanadium ions is synergistically improved, and lagging voltage reduction and overall electrochemical stability improvement are finally achieved by synergistically reducing interface impedance in the battery discharging process.

The invention relates to the technical field of electrochemical energy accumulators, in particular to a functional diaphragm for prolonging the cycle life of a sodium metal non-cathode battery and a preparation method thereof.The functional diaphragm comprises a base membrane and a functional coating coated on the surface of the base membrane, and the functional coating comprises an A-face coating and a B-face coating which are distributed on the two sides of the base membrane; the A-surface coating comprises a lamellar fast sodium ion material and a solvent, and the B-surface coating comprises a lamellar fast sodium ion material, a high-molecular polymer and a solvent. The coating layers with different functions are constructed on the two sides of the diaphragm to synergistically improve the bulk phase migration rate and the interface desolvation rate of sodium ions, so that the growth of sodium dendrites is inhibited, the coulombic efficiency of the sodium metal non-negative electrode battery is improved, and the cycle life of the sodium metal non-negative electrode battery is prolonged.

This invention discloses a method for preparing long-term stable ultra-high purity silica sol. The method involves preparing silica sol using an alkoxide method, followed by forced cyclic desolvation. By adding conjugate acid-base ionic dispersants, the pH and thermal stability of the silica sol are maintained. The prepared silica sol is then modified and subjected to high-pressure aging to ultimately obtain an ultra-high purity silica sol with a mass fraction of over 20%, a primary particle size between 30-150 nm, a secondary particle size between 50-350 nm, and an association degree between 1.7-2.3. The silica sol has a metal ion content of less than 1 ppm, a loss of less than 5% during preparation, and exhibits excellent polishing performance.

The invention relates to a continuous preparation method of a nitroimino triazine compound, and belongs to the technical field of organic chemistry. The method comprises the following steps: performing continuous reaction on raw materials through a tubular reactor, adding a stabilizer and a dehydrating agent into a reaction solution for dehydration-desolvation, and after dehydration, thoroughly removing the dehydrating agent from the material to prepare a triazine intermediate solution. According to the method, a distillation mode is adopted for dehydration, and compared with a traditional crystallization process, mother liquor cannot be generated, so that impurity accumulation cannot be caused, the purity of the triazine intermediate can be effectively improved under the condition that the utilization rate of raw materials is guaranteed, and the HPLC purity of the triazine intermediate is kept to be 99.0% or above. The problems that the yield and the purity are influenced by impurity accumulation or the utilization rate of raw materials is low in the prior art are solved.

The embodiment of the invention discloses an electrolyte and a battery, the electrolyte comprises a solute and a mixed solvent, the mixed solvent comprises a main solvent and a cosolvent, and the cosolvent comprises alkoxylated cyclic carbonate. When the alkoxylated cyclic carbonate is added into the electrolyte as a cosolvent, when the electrolyte is at a low temperature, a flexible chain segment of the alkoxylated cyclic carbonate can enhance the solvation ability of ions formed by dissociation of a solute in the electrolyte, and the desolvation time is shortened; and when the electrolyte is at a high temperature, the rigid carbonate cyclic structure of the alkoxylated cyclic carbonate can inhibit free radical chain reaction, reduce gas production and maintain high dielectric constant and interface stability at the same time, so that the self-adaptability of the electrolyte in a wide temperature range is improved.

This invention discloses a low-temperature fast-charging electrolyte suitable for graphite-based lithium-ion batteries. The electrolyte contains Li... + The solvated clusters are 1.5–3.0 nm in size, a size range that enables bulk / interfacial ion conduction and low Li- content. + A balance is struck between desolvation energy barrier and high interfacial stability. The electrolyte contains lithium salt, a non-aqueous organic solvent with strong / weak solvation capabilities, and film-forming additives. This balance is achieved by adjusting the lithium salt concentration and the number of solvent donors. The electrolyte operates at -60°C. o C remains liquid, -20 o The C-ion conductivity is higher than 3.5 mS / cm. Lithium-ion batteries using this electrolyte operate at -20°C. o C, at a 0.5C rate, stable cycling is achieved, with capacity retention not less than 85% after 150 cycles. This invention utilizes Li... + Solvated cluster size serves as a core guideline for electrolyte design, providing new insights for developing energy storage devices that combine low-temperature performance and fast-charging capabilities.

The invention provides an electrolyte capable of improving the proton embedding proportion. The electrolyte comprises soluble salt, an acidic additive and a mixed solvent. According to the electrolyte, a solvent system is reasonably designed, and an acid additive and an organic solvent are effectively combined, so that effective coordination of metal ions and anions is promoted, and the desolvation energy of the metal ions is improved; meanwhile, the introduction of the acidic additive can regulate and control the participation proportion of protons in the positive electrode reaction and inhibit the side reaction of the solvent, thereby improving the stability of the electrolyte. Compared with the prior art, the reaction kinetics of the battery is remarkably improved, the capacity and cycling stability are enhanced, and excellent electrochemical performance is shown.

The invention relates to the technical field of water-based zinc ion batteries, and particularly provides a ZHS / PVP K30-coated Zn metal negative electrode, a preparation method thereof and application of the metal negative electrode in a water-based zinc ion battery. The preparation method comprises the following steps: (1) fully dispersing basic zinc sulfate and polyvinylpyrrolidone K30 in a solvent to obtain a spinnable viscous spinning solution; and (2) carrying out electrostatic spinning on the zinc sheet to form a nanofiber membrane composed of ZHS / PVP K30 on the surface of the zinc sheet. The membrane has a three-dimensional porous network structure, and PVP K30 has hydrophilicity, so that infiltration of an electrolyte is facilitated, and ion transmission and reaction kinetics performance are improved. Besides, strong interaction exists between polar functional groups in the three-dimensional network and SO4 < 2-> groups in ZHS and water molecules, the solvation structure of hydrated Zn < 2 + > can be changed, and the desolvation process of Zn < 2 + > is accelerated, so that hydrogen evolution, corrosion and other side reactions caused by water molecules in the zinc deposition / stripping process are reduced.

The invention belongs to the technical field of synthesis, and particularly relates to a synthetic method of ethyl methylthioacetate, which comprises the following steps: taking ethyl chloroacetate and sodium methyl mercaptide as raw materials, taking water and ethyl acetate as solvents, and carrying out catalytic reaction, phase splitting, desolvation and rectification of a phase transfer catalyst to obtain the ethyl methylthioacetate. According to the method, the esterification decomposition influence of the raw materials in an alkaline water phase environment is solved, and meanwhile, the process cost and the process difficulty are greatly reduced.

The invention relates to the related technical field of lithium batteries, and particularly discloses a high-entropy electrolyte of a lithium metal battery, a preparation method and application, the high-entropy electrolyte comprises lithium fluoride and an organic solvent, and the organic solvent comprises high-polarity ethylene carbonate. The lithium ion battery also comprises lithium bis (oxalato) borate, lithium hexafluorophosphate, lithium bis (trifluoromethanesulfonyl) imide, lithium bis (fluorosulfonyl) imide, lithium difluoro (oxalato) borate and lithium nitrate, wherein the total molar concentration of lithium ions is 1 mol / L; the solvent further comprises methyl ethyl carbonate and dimethyl carbonate. Compared with a low-entropy electrolyte, the high-entropy electrolyte shows excellent regulation and control capability in interface chemistry and solvation chemistry and is compatible with high ionic conductivity and low desolvation potential barrier, the cycling stability of the lithium metal battery is remarkably improved, and the service life of the lithium metal battery is remarkably prolonged.

The invention provides an electrolyte, a preparation method thereof and a battery. The electrolyte comprises a phosphate flame retardant, a cosolvent, a high-donor-number solvent and salt, the cosolvent comprises at least one of a fluorobenzene compound, a fluoroether compound or a nitrile compound, the donor number of the high-donor-number solvent is larger than or equal to 8 kcal / mol, and the salt is sodium salt or lithium salt. The phosphate flame retardant is added, so that the safety of the battery can be improved; a cosolvent which is weakly coordinated with metal cations in salt is introduced into an electrolyte, the cosolvent and a phosphate flame retardant generate dipole-dipole interaction with the phosphate flame retardant due to low polarity and strong dipole moment, a phosphate flame retardant solvent can be pulled outwards, the binding energy between the phosphate flame retardant and the metal cations is weakened, a desolvation energy barrier is reduced, and the desolvation performance of the phosphate flame retardant is improved. The rate capability of the battery is improved; the anions in the high-donor-number solvent and the salt are preferentially coordinated with the metal cations, so that the coordination ratio of the phosphate to the metal cations can be reduced, and the rate capability of the battery can be improved.

The invention relates to the field of sodium sulfite production, in particular to sodium sulfite and a refining method thereof.The method comprises the steps that S1, a sodium sulfite crude product is dissolved, solid impurities are removed, filtrate is obtained, and the sodium sulfite crude product comprises one or more of impurity sodium sulfate, sodium phenolate organic matter and solid impurities; s2, adjusting the pH value of the filtrate to be less than or equal to 9, then contacting with an extraction agent for extraction, and separating to obtain a water phase and an oil phase; s3, carrying out first concentration crystallization on the water phase, and carrying out solid-liquid separation to obtain a first crystal solid and a first crystal filtrate; s4, dissolving the first crystal solid, carrying out second cooling crystallization, and carrying out solid-liquid separation to obtain a second crystal solid and a second crystal filtrate; and S5, carrying out third crystallization water removal crystallization on the second crystallization solid, carrying out solid-liquid separation, washing to obtain a sodium sulfite wet finished product and a third crystallization filtrate, and drying the sodium sulfite wet finished product. The color and the purity of the sodium sulfite product can be improved, and the obtained product meets the industrial standard.

The invention relates to the technical field of material preparation, in particular to a preparation method of a composite silicon-carbon negative electrode material, which comprises the following steps: putting porous carbon into a rotary furnace for emptying operation; heating the rotary furnace, and opening acetylene to obtain silicon carbon; pouring aluminum nitrate nonahydrate into a beaker, and adding deionized water for dissolving for later use; putting magnetons, stirring, and adding a silicon-carbon material; putting the beaker into a water bath kettle, adding a diammonium hydrogen phosphate solution, dissolving, adding the solution into the beaker, and stirring until the solution is evaporated; and drying to obtain powder, grinding the powder into powder, and carrying out heat treatment in a tubular furnace to obtain the A < l > PO4 coated silicon carbon material. According to the invention, CVD silicon carbon is coated with A-based compounds such as A < l > PO4 and the like, the coating material has excellent uniformity and integrity, and the rate capability of the material is effectively improved and the cycle capability of the material is improved based on the relatively strong desolvation capability and high bonding strength of the material.

The application discloses a kind of two-dimensional material's desolvation lossless precision transfer method, comprising: silicon wafer is functionalized with HMDS;PMMA anisole solution is used to spin coating and dry to form PMMA support film to functionalized silicon wafer;Hot release glue PDMS is used to pick up PMMA support film;PDMS / PMMA is transferred to the surface of two-dimensional material / first substrate needing to be transferred, after heating, PDMS is separated from PMMA, and PMMA covers the surface of two-dimensional material;Through etching of etching solution, PMMA / two-dimensional material is separated from first substrate;PMMA / two-dimensional material separated from first substrate is fished up with PDMS;PMMA / two-dimensional material is transferred to second substrate;Using acetone, PMMA is cleaned, and nitrogen is blown dry, namely finished.The application can realize clean, efficient and accurate transfer of two-dimensional material, and can avoid intolerance of two-dimensional material to organic solvent and pollution of organic solvent.

The invention discloses a thermal insulation composite material for a fire balloon top, and particularly relates to the field of new materials for fire balloons, the material is composed of zirconia particles, alumina particles, a low temperature curing polyimide prepolymer, nano silica sol, a polysilsesquioxane solution and the like. The filler is subjected to double-layer coupling modification through methyl triethoxy silane and diimide end-capped modified aminopropyl triethoxy silane; and organic titanium or organic zirconium catalysis, two-stage solvent removal, imidization and hot-pressing curing processes are adopted for preparation. Through the synergistic effect of a double-layer coupling interface, a controlled catalytic system, staged desolvation and hot-pressing co-curing, the material is compact in structure and firm in interface bonding, and heat conduction and interface stress concentration are remarkably reduced; the obtained heat insulation composite layer is low in heat conductivity coefficient, high in adhesive force, excellent in heat shock resistance, free of delamination and failure under long-term heat circulation and capable of meeting the comprehensive requirements of the balloon top of the hot-air balloon for light weight, high heat insulation and high reliability.

Provided are a non-aqueous electrolyte solution and an electrochemical element with which desolvation resistance can be reduced. The non-aqueous electrolyte solution contains at least one of 200 wt ppb or more of zirconium and 30 wt ppb or more of lanthanum. The non-aqueous electrolyte solution may further contain 10 wt ppb or more of strontium. The non-aqueous electrolyte solution may contain zirconium and lanthanum, and the ratio of the concentration of lanthanum to the concentration of zirconium may be 0.2-0.5. The electrochemical element includes a non-aqueous electrolyte solution.

The invention belongs to the technical field of electrochemistry, and relates to a two-dimensional acetylene-rich carbon frame fast-charging negative electrode material and a preparation method and application thereof. The negative electrode material is prepared by respectively dissolving two monomers in an upper layer and a lower layer of mutually insoluble solvents and carrying out Sonogashira coupling polymerization at an interface, the two monomers are bromine-containing organic lithium and 1, 4-diacetylene benzene. The two monomers can also be added into an organic solvent, and corresponding products can be obtained through an oil bath heating reaction. The highly ordered structure of the material can significantly improve the transmission kinetics of lithium ions. In addition, the introduction of the carboxyl lithium group can optimize the electronic structure of the material, so that the electrode interface desolvation process and SEI interface film components are regulated and controlled, and excellent fast charging performance is shown. The invention provides a high-performance electrode material and an innovative preparation method for the fast-charging lithium ion battery.

The invention relates to a method suitable for detecting three aconitine in various compound traditional Chinese medicine preparations, which comprises the following steps: preparing a reference extract solution and a test solution, introducing a magnetic solid-phase extraction technology when the test solution is prepared, and accurately'capturing 'and separating target aconitine from a complex chemical component background; a multi-reaction monitoring mode of triple quadrupole mass spectrometry is adopted, and a Shim-pack Scept C18-120 chromatographic column is adopted as a chromatographic column; the column temperature is 40 DEG C; a mobile phase is 0.14% formic acid aqueous solution (A)-acetonitrile (B), gradient elution is carried out for 0-5 min, 95% A > 5% A; the flow rate is 0.3 mL * min <-1 >; the sample size is 1 microliter; a mass spectrum ion source is an electrospray ionization source, a positive ion multi-reaction monitoring mode is adopted, the capillary voltage is 3.5 kV, the ion source temperature is 150 DEG C, and the solvent removal temperature is 500 DEG C. The high-efficiency purification of MCX and the high-specificity detection of LC-MS / MS are combined to form a set of powerful method system, the method system is successfully applied to various dosage forms with different formulas, and the industry dilemma of'one preparation and one method 'is solved.

A lithium-ion battery electrolyte is disclosed that enables reversible lithiation and delithiation from +50° C. down to −80° C. The electrolyte is a dual-solvent system of 1,3-dioxolane and butyronitrile formulated to balance donor strength and desolvation energy, creating a solvent-separated-ion-pair-rich solvation shell with very low Li+ transport activation energy. This tailored solvation promotes formation of a thin, mechanically elastic solid-electrolyte / inter-electrolyte interphase containing LiF, Li3N, and polymeric ether domains derived from the solvents and additive salts. The resulting interphase provides high ionic conductivity and chemical robustness while minimizing impedance growth. Electrochemical testing demonstrates stable cycling for over 50 cycles at temperatures from −80° C. to +50° C. with high coulombic efficiency. The invention establishes a coupled solvation-interphase design principle that decouples ionic mobility from interfacial stability, enabling reliable cryogenic operation and providing a predictive framework for next-generation low-temperature lithium-ion battery electrolytes.

The present application relates to the technical field of electrochemical energy storage, and particularly relates to a functional separator for improving the cycle life of a sodium metal anode-free battery and a preparation method thereof, which comprises a base film and a functional coating coated on the surface of the base film, the functional coating comprises an A-side coating and a B-side coating distributed on both sides of the base film, the A-side coating comprises a laminar fast sodium ion material and a solvent, and the B-side coating comprises a laminar fast sodium ion material, a polymer and a solvent. The present application builds the coatings with different functions on both sides of the separator, cooperatively improves the bulk phase migration rate and the interface desolvation rate of sodium ions, thereby inhibiting the growth of sodium dendrites and improving the coulombic efficiency and the cycle life of the sodium metal anode-free battery.

The application provides a low-temperature sodium ion battery containing a modified negative electrode and a preparation method and application thereof, and the low-temperature sodium ion battery comprises a positive electrode, a negative electrode and an electrolyte; the negative electrode comprises a negative electrode slurry, and the negative electrode slurry comprises an active material, conductive carbon, sodium carboxymethyl cellulose and butadiene styrene rubber; the active material comprises modified hard carbon; the modified hard carbon is prepared by oscillating and mixing hard carbon, single-walled carbon nanotubes, graphite carbon and soft carbon to achieve physical coating, and then oscillating and mixing the physical coating with doped modification precursor powder to achieve element doping and chemical coating through high-temperature calcination; and the electrolyte comprises an additive selected from trimethylsilyl nicotinate, 4-hydroxy-3-methoxycinnamic acid methyl ester and the like. The application improves the adhesion of the negative electrode slurry on the current collector, optimizes the solvent formula to improve the desolvation capacity of sodium ions in the electrolyte and reduce the viscosity, and adds an additive to modify the electrode surface interface film, so that the charge-discharge performance of the battery at low temperature is improved.

The invention discloses a xanthate slurry continuous separation-drying integrated system and method, and belongs to the technical field of chemical drying. The system comprises a slurry tank, a feeding pump, a horizontal type spiral discharging sedimentation centrifuge, a three-section type wet material transfer tank group, a vacuum disc type continuous drying machine, a condensation-buffering-double-solvent recovery device, a vacuum system, a PLC (Programmable Logic Controller) control unit and a plurality of groups of sensors, according to the method, a centrifugal desolvation-vacuum low-temperature drying coupling process is adopted, and through online oxygen content, temperature, moisture, vacuum degree and VOCs detection, energy is saved by 30% or above, the product moisture content fluctuation is smaller than or equal to + / -4%, the solvent recovery rate is larger than or equal to 95%, and the whole process is automatically operated. A control experiment shows that compared with traditional belt type drying, the unit energy consumption is reduced by 38%, the drying time is shortened by 50%, and the spontaneous combustion hidden danger does not exist. The method is suitable for continuous, large-scale and safe production of high-solid-content and high-viscosity xanthate slurry.