11 results about "Diethylene glycol dimethyl ether" patented technology

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.

This invention discloses a bio-based high-efficiency antibacterial polyester fiber and its preparation method, belonging to the field of synthetic fiber technology. It solves the problems of high hue, low bio-based content, and weak antibacterial performance in existing technologies. The fiber is copolymerized from a first, second, third, and fourth ester. The first ester is formed by esterification of oxalic acid and 1,3-propanediol; the second ester is formed by esterification of an aliphatic diacid and 1,3-propanediol; the third ester is formed by esterification of a quaternary ammonium salt of hydroxy fatty acids; and the fourth ester is formed by esterification of terephthalic acid and ethylene glycol. This invention uses oxalic acid, aliphatic diacids, 1,3-propanediol, and quaternary ammonium salts of hydroxy fatty acids to prepare polyester fibers, achieving a bio-based carbon content of over 30%. The entire preparation process eliminates the need for diethylene glycol dimethyl ether, a solvent required in existing technologies, thus solving the problem of high hue caused by solvent residue. The fiber maintains highly efficient and long-lasting broad-spectrum antibacterial properties, with an antibacterial rate exceeding 99%.

The application discloses an ultralow-temperature aluminum electrolytic capacitor and a preparation method thereof. The capacitor comprises an anode foil, a cathode foil, an electrolytic paper between the anode foil and the cathode foil, and an electrolyte solution contained in the electrolytic paper. The electrolyte solution comprises, by weight percentage, propylene carbonate 15-25%, methyl ethyl carbonate 20-28%, diethylene glycol dimethyl ether 16-26%, lithium tetrafluoroborate 7-12%, lithium bisfluorosulfonylimide 2-5%, lithium difluorobisoxalate borate 2-5%, vinyl sulfate 4-8%, methanedisulfonate methylene 1.5-3.5%, mesoporous silicon dioxide 4-9%, lithium hexafluorophosphate 0.2-1.0%, lithium bis-trifluoromethanesulfonylimide 1.5-5%, a chelating agent 0.01-0.05%, and p-nitrophenol 0.3-1.2%. The preparation method comprises core wrapping, drying treatment, ring-type immersion, liquid removal treatment, assembly waist bundling, and aging treatment. The capacity retention rate of the capacitor can reach more than 90% at an ultralow temperature of -55 DEG C, and the Z ratio is only 1.29, so that the ultralow temperature and high temperature stability are synergistically improved.

The invention discloses an electrolyte with long circulation, low overpotential and high current density. The electrolyte comprises an organic solvent, magnesium salt and a trifluoromethanesulfonate additive, the organic solvent is one or more of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether and tetrahydrofuran; the magnesium salt is magnesium chloride; in the organic solvent, the concentration of the magnesium chloride is 0.1 mol / L to 0.4 mol / L, and the concentration of the trifluoromethanesulfonate additive is 0.1 mol / L to 1.0 mol / L. According to the rechargeable magnesium battery electrolyte, dissolution of magnesium salt is promoted, interface regulation and control can be carried out on a magnesium negative electrode interface, a double-electrode-layer structure beneficial to Mg < 2 + > migration and a stable SEI film are constructed, and therefore the battery has low overpotential, high ionic conductivity and excellent cycling stability under large current. The electrolyte is simple in preparation process and convenient for industrial popularization.

The invention discloses a low-cost and high-capacity intercalation-conversion type lithium battery and a preparation method thereof, and belongs to the technical field of lithium batteries. The lithium battery takes graphite paper coated with tetramethyl ammonium iodide and carbon black as a positive electrode; an aluminum foil coated with a lithium-rich material (lithium iron phosphate and a ternary lithium material) is used as a negative electrode, and an electrolyte is a mixed solution of dimethyl formamide dissolved with lithium bromide and lithium trifluoromethanesulfonate and diethylene glycol dimethyl ether. The intercalation-conversion type lithium battery with a novel structure and a novel material is constructed by adopting a lithium-rich material as a middle layer between aluminum and an electrolyte and combining a bromine / iodine synergistic double-electron transfer chemical mechanism at a positive electrode. The double-electron transfer process of iodine is realized, so that the discharge voltage and the discharge capacity are synchronously improved. The battery system shows double discharge platforms of 3.6 V and 3.0 V, the discharge capacity of 211 mAh / g, the energy density of 637 Wh / kg and the long service life of 2000 cycles. The system shows extremely high safety, can still operate normally after a physical damage test, and does not cause any safety accident. In addition, the battery system is simple in structure and has remarkable cost benefits.

According to the high-performance electrolyte and the battery, a semi-solid electrolyte membrane which takes polyvinyl formal (PVFM) as a polymer matrix and introduces a two-component plasticizing system composed of diethylene glycol dimethyl ether (DEGDME) and a fluoro-ester compound is constructed, so that the electrolyte membrane keeps good mechanical flexibility, and meanwhile, the high-performance electrolyte has the advantages that the performance of the electrolyte membrane is improved, and the service life of the electrolyte membrane is prolonged. And the lithium ion battery has high lithium ion migration rate and chemical compatibility with the surface of the silicon-based negative electrode, so that the rate capability and the cycling stability of the battery are remarkably improved on the premise of not sacrificing the safety.

The invention relates to the technical field of material analysis, in particular to a method for measuring the content of VOC in cellulose ether. According to the test method provided by the invention, an internal standard method is adopted, ethylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol monomethyl ether, diethylene glycol butyl ether, triethylene glycol dimethyl ether, 1, 2-propylene glycol and the like are taken as calibration compounds, cyclopropyl methyl ketone is taken as an internal standard compound, and solid powdery cellulose ether is subjected to specific pretreatment; by combining certain gas chromatography conditions, the efficient separation of 10 VOCs such as ethylene glycol monomethyl ether is realized, and the content of the VOCs in the cellulose ether can be accurately determined. According to the method, the defect of detection of the VOC content in the cellulose ether is overcome, the stable and efficient analysis method is established, and the method is easy and convenient to operate, high in sensitivity, good in reproducibility and high in long-term stability.

This invention relates to the field of electrolyte technology, specifically to a non-aqueous electrolyte for dual-anionic magnesium salt fuel cells, comprising the following components: a composite salt, a mixed solvent, magnesium fluoride (MgF₂) nanoparticles, 1,3-dioxolane (DOL), diethylene glycol dimethyl ether (G2), and trimethyl phosphate (TMP). This invention utilizes a composite salt system composed of magnesium trifluoromethanesulfonate and magnesium bis(trifluoromethanesulfonyl)imide, which significantly enhances the ion transport capacity of the electrolyte through a dual-anionic synergistic effect.

The application discloses a negative-electrode-free sodium battery electrolyte and a preparation method and application thereof, and belongs to the battery field.The negative-electrode-free sodium battery electrolyte comprises the following raw materials in parts by weight: 50-80 parts of a linear ether main solvent; 10-30 parts of 1,3-dioxolane cosolvent; 10-17 parts of an electrolyte sodium salt; and 0.3-2 parts of a pyridine boronic acid additive.The pyridine boronic acid additive is at least one of pyridine-3-boronic acid, pyridine-3-boronic acid neopentyl glycol ester and pyridine-4-boronic acid neopentyl glycol ester.The linear ether main solvent is at least one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether and diethylene glycol diethyl ether.The negative-electrode-free sodium battery electrolyte can achieve the effects of good first-effect exertion and long cycle life.

The invention relates to a preparation method and application of a Zn (at) Bi / BiOCl integrated zinc metal negative electrode. According to the method, the Zn (at) Bi / BiOCl integrated negative electrode is prepared in situ by carrying out replacement and hydrolysis reaction in a bismuth salt solution. The used bismuth salt comprises one or more of bismuth trifluoromethanesulfonate, bismuth nitrate and bismuth chloride, the bismuth salt is dissolved in one or a combination of more of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetrahydrofuran and N, N-dimethylformamide, and the soaking time is controlled to be 30 seconds to 30 minutes. According to the prepared Zn (at) Bi / BiOCl integrated zinc metal negative electrode, the synergistic effect of BiOCl with semiconductor characteristics and a built-in electric field and zinc-philic Bi metal can be achieved. The synergistic effect effectively adjusts the uniform distribution of an interface electric field and an ion field, and reduces the potential barrier of a hydrogen evolution reaction at the same time. Through the adjustment, not only is the hydrogen evolution potential barrier increased, but also the zinc nucleation potential barrier is reduced, and the interface electric field is homogenized, so that the hydrogen evolution reaction, the side reaction and the formation of zinc dendrites are effectively inhibited. Therefore, under the multiple effects of the Zn (at) Bi / BiOCl integrated zinc negative electrode, the long cycle performance, hydrogen evolution reaction inhibition and corrosion resistance of the water-based zinc ion battery / capacitor are remarkably improved.

The application discloses a kind of electrolyte for graphite negative electrode sodium ion battery, belong to new energy battery technical field.Electrolyte is composed of organic solvent, sodium salt and additive, organic solvent is one or more in diethylene glycol dimethyl ether, ethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, sodium salt is one or more in sodium hexafluorophosphate, sodium tetrafluoroborate, sodium difluorosulfonylimide, additive is one or more in sodium dicyanoguanidine, sodium cyanurate.By the polycyanogen conjugated structure of additive, form coordination bond-π bond synergic anchoring effect between graphite layers and make graphite interlayer spacing expand;Meanwhile, form dense and stable SEI film on the negative electrode surface, inhibit sodium dendrite growth.Electrolyte has good initial charge capacity, capacity retention rate after 3000 cycles, 5C rate capacity retention rate and thermal safety temperature, solve the technical problems of traditional electrolyte interface film loose, poor cycle stability, poor rate performance and insufficient thermal stability.