18 results about "Lithium chlorate" patented technology

The low-temperature electrolyte comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-3); the organic solvent is composed of cyclic carbonate, chain carbonate and chain carboxylate, the mass percentage of the cyclic carbonate, the chain carbonate and the chain carboxylate is 10-20: 10-30: 10-80, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate, and the chain carboxylate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. The lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate. Compared with a single auxiliary additive, the low-temperature performance of the electrolyte can be remarkably improved by combining the amino-containing nicotinonitrile compound with the auxiliary additive according to the proportion.

The invention discloses an electrolyte for a lithium battery, which comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-10); the organic solvent is composed of cyclic carbonate and chain carbonate in a mass ratio of (10-30): (70-90); the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate; the additives comprise a high-temperature stabilizer, an antioxidant and a film-forming accelerant, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, and the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. By optimizing the components of the electrolyte, the stability of the electrolyte at a high temperature is improved, and decomposition and side reactions are reduced, so that the performance of the battery in a high-temperature environment is improved, and the cycle life of the battery in a high-temperature environment is prolonged.

The present invention belongs to the technical field of organic synthesis, and in particular to a chromium oxide-lithium perchlorate composite catalyst and its preparation method and application in the preparation of bisphenol F. The chromium oxide-lithium perchlorate composite catalyst provided by the present invention has an affinity for the inorganic phase and the organic phase in the bisphenol F reaction system, can make phosphoric acid better contact with phenol and paraformaldehyde during the condensation reaction, reduce surface tension and surface free energy, thereby improving the yield of bisphenol F, in an acidic medium, the chromium oxide-lithium perchlorate composite catalyst combines the carbon cation of formaldehyde with phosphoric acid to generate a semi-phosphorus-based ketal, increases the steric effect, improves the selectivity of the condensation reaction, and thus the chromium oxide-lithium perchlorate composite catalyst has a stronger catalytic effect and better selectivity for the reaction process of preparing bisphenol F, can effectively reduce the content of by-products in the process of synthesizing bisphenol F resin, improve product yield and the proportion of 4,4'-dihydroxydiphenylmethane.

The invention relates to the technical field of electrochemical energy storage, in particular to a novel high-entropy electrolyte based on a deep eutectic solvent and application of the novel high-entropy electrolyte in electrochemical devices such as a low-temperature secondary battery and a supercapacitor. The deep-eutectic solvent high-entropy electrolyte is composed of at least five deep-eutectic solvents. The eutectic solvent is composed of a hydrogen bond acceptor and a hydrogen bond donor; the hydrogen bond acceptor is one of choline chloride, tetraethylammonium chloride, tetrabutylammonium chloride, zinc chloride, magnesium chloride, lithium perchlorate and water; the hydrogen bond donor is one of urea, citric acid, lactic acid, acrylic acid, itaconic acid, formic acid, ethylene glycol, glycerol, acetamide, formamide and water. According to the deep-eutectic solvent high-entropy electrolyte disclosed by the invention, the liquid-solid transformation temperature of the electrolyte is reduced, and relatively good low-temperature performance can be obtained; and the method has the advantages of low raw material cost and environmental protection.

This invention discloses a sulfide-based fluorine-free high-entropy electrolyte in the field of battery technology, comprising a composite lithium salt system, a sulfide solvent, and a fluorine-free inert diluent. The composite lithium salt system consists of at least two lithium salts selected from lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium difluorooxalate borate, lithium nitrate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium trifluoroacetate, and lithium dioxalate borate. The sulfide solvent is selected from one or more of dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide, methyl propyl sulfide, methyl butyl sulfide, dimethyl disulfide, cyclohexane sulfide, phenyl sulfide, and diphenyl disulfide. The fluorine-free inert diluent is at least one of cyclopentane, cyclohexane, n-hexane, benzene, n-butane, isobutane, and n-pentane. This invention solves the problems of existing electrolytes, such as difficulty in balancing conductivity and interfacial stability, poor high and low temperature performance, and narrow electrochemical window; and achieves a comprehensive improvement in the overall performance of the electrolyte.

The invention belongs to the technical field of metal detection and analysis, and particularly relates to a method for reducing soot blowing time in a lead assaying method, which comprises the following steps: paving sodium carbonate at the bottom of a clay crucible, weighing a sample and putting the sample into the clay crucible; adding a soot blowing protective agent, a reducing agent, lead oxide, borax, quartz sand and a covering agent into the clay crucible; placing the clay crucible in a muffle furnace for smelting; casting the melt in the clay crucible into a dry iron mold, cooling, and discarding upper-layer slag to obtain an alloy block of lead and precious metal; putting the alloy block into a magnesia cupel; the magnesia cupel and an oxygen slow-release block are put into a hearth of a muffle furnace, a furnace door is closed, the ash blowing process is executed, and the oxygen slow-release block is formed by evenly mixing solid lithium perchlorate and a binder and then pressing the mixture. According to the method, the soot blowing time of a lead assaying analysis method is shortened, the mass loss of the precious metal under long-time soot blowing is reduced, the precious metal analysis process is accelerated, and the accuracy and reliability of an analysis result are improved.

The invention relates to the field of solid-state electrolyte, in particular to a solid-state electrolyte precursor, a solid-state electrolyte and a preparation method of the solid-state electrolyte precursor. The solid electrolyte precursor comprises a mixed solvent, a lithium salt, a mesoporous material, a first compound and a second compound, wherein the lithium salt is selected from lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate and the like; the mixed solvent comprises a component a, a component b and a component c, wherein the component a is an alcohol or ether solvent; and the component b is one or more of compounds such as thionyl chloride, trimethyl sulfoxide bromide, sulfoxide bromide and the like. The solid electrolyte precursor prepared by the invention is stable and storable, and can be self-polymerized to form a frame-type three-dimensional structure material after the catalyst is added, and additional initiators and cross-linking agents are not needed.

The invention relates to the technical field of lithium battery positive electrode materials, in particular to a battery positive electrode multifunctional binder and a preparation method and application thereof. The multifunctional binder for the positive electrode of the battery comprises a lithium salt, 2-vinyl-1, 3-dioxolame and conductive carbon, the lithium salt is selected from one or more of lithium hexafluorophosphate, lithium perchlorate, lithium bis (trifluoromethylsulfonyl) imide, lithium bis (oxalato) borate, lithium difluoro (oxalato) borate and lithium bis (fluorosulfonyl) imide. The battery positive electrode multifunctional binder provided by the invention has good mechanical strength and bonding strength and excellent ion / electron conduction performance, a high-load positive electrode can be prepared based on the multifunctional binder, and a lithium battery assembled by the multifunctional binder can realize high energy density and stable circulation.

The present invention discloses a low-temperature electrolyte for lithium batteries, including an organic solvent, a lithium salt and an additive, wherein the mass percentage of the organic solvent, the lithium salt and the additive is 70-90:5-20:0.2-3; the organic solvent is composed of a cyclic carbonate, a chain carbonate and a chain carboxylate, and the mass percentage is: 10-20:10-30:10-80, the cyclic carbonate is one or both of ethylene carbonate and propylene carbonate, the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methylpropyl carbonate, and the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate. Compared with the single administration of auxiliary additives, the present invention uses the above-mentioned ratio of amino-containing nicotinonitrile compound in combination with the auxiliary additive to significantly improve the low-temperature performance of the electrolyte.

The invention discloses a method for preparing lithium bis(fluorosulfonyl)imide. The method for preparing lithium bis(fluorosulfonyl)imide of the invention comprises: step S1, mixing aminosulfonic acid, thionyl chloride and sulfur trioxide, and performing reduced pressure distillation to obtain bis(chlorosulfonyl)imide after the reaction; step S2, adding the bis(chlorosulfonyl)imide, antimony trifluoride and potassium carbonate to a polar solvent for reaction, and adjusting the pH value to neutral, performing solid-liquid separation, collecting the liquid phase, and obtaining a potassium bis(fluorosulfonyl)imide solution; step S3, adding a lithium perchlorate solution to the potassium bis(fluorosulfonyl)imide solution, performing solid-liquid separation, collecting the liquid phase, adding dichloromethane for recrystallization, and drying to obtain lithium bis(fluorosulfonyl)imide. The method for preparing lithium bis(fluorosulfonyl)imide of the invention has the advantages of high yield, low waste discharge, and meets the requirements for the development of the green chemical industry, and can be widely used in industrial production.

The invention belongs to the technical field of supercapacitor electrode materials, and relates to an all-solid-state supercapacitor based on a CuCo2O4-PDMT composite electrode and a preparation method thereof.The preparation method comprises the steps that copper nitrate and cobalt nitrate serve as metal sources, and a CuCo2O4 bottom layer is prepared through constant-potential electro-deposition-muffle furnace annealing; 2, 5-dimethylthiophene (DMT) is used as a monomer, a PDMT top layer is prepared through cyclic voltammetry electropolymerization, and a CuCo2O4-PDMT composite electrode is formed; polyethylene glycol (PEG) is used as a gel matrix, lithium perchlorate (LiClO4) is used as an ion source, nano TiO2 is used as a reinforcing agent, and the composite gel electrolyte is prepared through'microwave dissolution-ultraviolet curing '. The composite electrode and the gel electrolyte are assembled into the all-solid-state symmetrical supercapacitor, so that the defects of high electrode electron transmission impedance, low gel electrolyte ion conductivity and insufficient cycling stability of the existing all-solid-state supercapacitor are overcome, and the collaborative construction of the composite electrode conductive network and the gel electrolyte ion channel is realized; and the performance limitation of traditional single component optimization is broken through.

The invention discloses a preparation method of a sulfide solid electrolyte film, and belongs to the technical field of electrolyte film preparation, and the preparation method comprises the following steps: step 1, pretreating a polymer substrate, dissolving the polymer substrate in a solvent after pretreatment, and stirring until the solution becomes transparent mucilage; 2, adding lithium perchlorate into the transparent mucus obtained in the step 1, stirring to obtain uniform slurry, adding sulfide powder into the slurry, and stirring to obtain stirred mucus; and step 3, preparing the stirred mucus obtained in the step 2 into a film through a tape casting method, and preparing the sulfide solid electrolyte film through thermosetting. By adopting the preparation method of the sulfide solid electrolyte film, the preparation method provides a feasible strategy and method for the development of solid electrolytes and solid batteries with high ionic conductivity and high mechanical properties, and lays a good foundation for the research of the solid electrolytes and the development of the solid batteries.

The application belongs to the technical field of lithium battery electrolyte resource recovery, and discloses a method for recovering lithium chloride resources in lithium perchlorate mother liquor. The method for recovering lithium chloride resources in lithium perchlorate mother liquor comprises the following steps: mixing and diluting lithium perchlorate mother liquor with water to obtain diluted lithium perchlorate mother liquor; then adding sodium carbonate solution for mixing and lithium precipitation to obtain lithium precipitation mother liquor and lithium carbonate dry material; concentrating the lithium precipitation mother liquor, then adding hydrochloric acid for reaction, and then cooling and precipitating sodium to obtain sodium chloride and perchloric acid mother liquor; the perchloric acid mother liquor is subjected to normal pressure distillation and vacuum distillation in sequence to obtain fractionated perchloric acid solution, and the remaining solution after the vacuum distillation is returned to be mixed with the lithium precipitation mother liquor. The method utilizes the solubility of lithium carbonate and the boiling point of perchloric acid to realize recovery of lithium chloride resources in lithium perchlorate mother liquor, wherein the recovery rate of lithium is greater than 90%, the recovery rate of perchlorate is greater than 76%, it is environmentally friendly, the initial investment is small, and the recovery cost is low.

Electrochemical cell in which lithium ions move back and forth, comprising: Electrode comprising a chalcogen-containing electroactive material, wherein the chalcogen-containing electroactive material comprises elemental selenium or a selenium-containing active material; and Electrolyte system, including: one or more lithium salts selected from the group consisting of: lithium bis(fluorosulfonyl)imide (LiN(FSO2)2), bis(trifluoromethane)sulfonimide lithium salt (LiN(CF3SO2)2), lithium hexafluorophosphate (LiPF6), lithium hexafluoroarsenate (LiAsF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium iodide (LiI), lithium bromide (LiBr), lithium thiocyanate (LiSCN), lithium difluoro(oxalato)borate (LiBF2(C2O4)), LiPF3(C2F5)3, LiPF4(CF3)2, lithium tetrafluoro(oxalato)phosphate (LiPF4(C2O4)), LiPF3(CF3)3, LiSO3CF3 and combinations thereof, and one or more solvents selected from the group consisting of: cyclic carbonates, linear carbonates, aliphatic carboxylic esters, γ-lactones, chain structure ethers, cyclic ethers and combinations thereof, wherein the electrolyte system is essentially free of lithium nitrate (LiNO3) and the electrochemical cell has a minimum charge potential of more than or equal to about 0.8 V to less than or equal to about 1.8 V.

The invention discloses a high-performance solid polymer electrolyte and a preparation method thereof. The high-performance polyethylene oxide / polyvinyl chloride-lithium perchlorate-zinc sulfide (PEO / PVC-LiClO4-ZnS) solid polymer electrolyte is prepared by combining polyethylene oxide (PEO), polyvinyl chloride (PVC), lithium perchlorate (LiClO4) and zinc sulfide (ZnS). And the formed PEO / PVC (Poly Vinyl Chloride)-LiClO4-ZnS solid polymer electrolyte has relatively high battery energy density and excellent electrochemical cycle stability. The solid polymer electrolyte prepared by the method can be widely applied to energy storage and conversion equipment such as a lithium ion battery and a lithium air battery, the safety and the energy density of the battery are improved, and the cycle life of the battery is prolonged.

The present disclosure relates to the field of solid-state electrolyte, in particular to a solid-state electrolyte precursor, a solid-state electrolyte and a preparation method thereof. The solid-state electrolyte precursor comprises the following: a mixed solvent, a lithium salt, a mesoporous material, a first compound and a second compound; wherein the lithium salt is selected from lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate and the like; the mixed solvent comprises the following components: a component a: an alcohol or ether solvent; a component b: one or more of the following compounds: thionyl chloride, trimethylsulfonium bromide, sulfuryl bromide and the like. The present disclosure prepares a solid-state electrolyte precursor which is stable and storage-resistant itself, and can form a framework type three-dimensional structure material after the addition of a catalyst without the need for additional initiators and crosslinking agents.

The invention discloses a low-temperature aqueous electrolyte and a preparation method and application thereof, and belongs to the technical field of aqueous electrolytes. The low-temperature aqueous electrolyte provided by the invention comprises a metal salt, an additive, water and a cosolvent, the metal salt is selected from one or more of lithium chloride, lithium nitrate, lithium perchlorate, lithium hexafluorophosphate, bis (trifluoromethanesulfonyl) lithium imide, sodium chloride, sodium hexafluorophosphate, sodium tetrafluoroborate, sodium nitrate, potassium chloride, potassium nitrate, magnesium chloride, magnesium perchlorate, zinc perchlorate and zinc chloride; the additive is calcium chloride; the cosolvent is ethylene glycol. According to the aqueous electrolyte provided by the invention, the ethylene glycol with relatively low toxicity is used as a cosolvent, so that the aqueous electrolyte has excellent low-temperature performance while reducing the concentration of the lithium salt in the aqueous electrolyte, and has the advantages of being green, environment-friendly, relatively low in price, safe and flame-retardant.

This invention discloses a pre-lithiation method for a secondary lithium-ion battery cathode material. The method includes: (1) mixing secondary lithium-ion battery cathode powder with a conductive agent, binder, and N-tetramethylpyrrolidone to prepare a slurry, uniformly coating it onto a carbon paper electrode, and then drying it to obtain a pre-lithiated electrode; (2) dissolving lithium fluoride powder in an aqueous solution to prepare a saturated lithium fluoride solution, and adding lithium perchlorate powder to prepare an electrochemical solution system; (3) placing the dried pre-lithiated electrode as the working electrode in the electrochemical solution system prepared in step (2), forming a three-electrode system with a platinum electrode and a reference electrode; or forming a two-electrode system with a lithium titanate electrode; placing the pre-lithiated electrode at a low voltage and maintaining a constant voltage state for 0.5-2 hours, then removing it from the solution and drying it, thus ending the pre-lithiation process. This invention uses an electrochemical pretreatment method to embed excess Li ions into the electrode material, significantly improving material performance and showing broad application prospects.