7 results about "Dimethyl sulfite" patented technology

The invention relates to a wide-temperature-range dimethyl sulfite-based lithium ion high-entropy electrolyte which takes lithium difluorophosphate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluoro (oxalato) borate, lithium bis (trifluoromethylsulfonyl) imide and / or lithium bis (fluorosulfonyl) imide as solutes; the dimethyl sulfite is mixed with ethylene carbonate, ethylene sulfite, propylene carbonate, ethylene carbonate, fluoroethylene carbonate, butyronitrile and / or isobutyronitrile to form a solution. According to the invention, the adaptability of the electrolyte in a wide temperature range is further improved while the dimethyl sulfite-based lithium ion electrolyte resists 5V high voltage, the discharge capacity at-40 DEG C is optimized, and the cycle stability at 60 DEG C is considered.

This invention discloses a high-stability, low-temperature lithium-ion battery electrolyte, its preparation method, and a lithium-ion battery. The high-stability, low-temperature lithium-ion battery electrolyte of this invention comprises a solvent system and composite additives. By mass percentage, the solvent system comprises 94%–96% and the composite additives comprise 4%–6% of the liquid system. The solvent system includes ethylene carbonate, dimethyl sulfite, and carboxylic acid esters in a mass ratio of 35–45:30–40:10–30. The composite additives include siloxane additives and fluoroethylene carbonate in a mass ratio of 2–3:2–3. This invention, through the synergistic design of the solvent system, endows the electrolyte with excellent low-temperature ion conductivity. Simultaneously, by utilizing the synergistic effect of the siloxane composite additives and film-forming additives, it significantly improves the stability of the electrode / electrolyte interface, enabling the lithium-ion battery to exhibit good charge-discharge performance and cycle stability in the low-temperature range of -40℃ to 25℃.

A high-voltage-resistant wide-temperature-range lithium ion battery electrolyte is characterized in that lithium salt with the concentration being 0.9 mol / L and a lithium salt additive with the concentration being 0.1 mol / L are dissolved in an organic solvent, and the lithium salt is lithium difluoro (oxalato) borate, lithium bis (trifluoromethylsulfonyl) imide, lithium bis (fluorosulfonyl) imide or a combination of the lithium difluoro (oxalato) borate, the lithium bis (trifluoromethylsulfonyl) imide and the lithium bis (fluorosulfonyl) imide; the lithium salt additive is lithium difluorophosphate. According to the invention, the freezing point is reduced by optimizing the components, so that the specific discharge capacity of the lithium ion battery containing the dimethyl sulfite-based electrolyte at a low temperature is improved, and meanwhile, the formation of an inorganic-rich interface is promoted to improve the cycling stability of the lithium ion battery containing the dimethyl sulfite-based electrolyte at a high temperature.

The present invention discloses a wide-temperature-range lithium / carbon fluoride battery, a cathode material, and an electrolyte. The battery includes a cathode, an anode, a separator, and an electrolyte. The cathode includes a carbon fluoride cathode material. The preparation method of the carbon fluoride cathode material is as follows: Place carbon fluoride in a plasma chemical vapor deposition furnace, maintain a vacuum, introduce a carbon source gas into the plasma chemical vapor deposition furnace, control the radio frequency power to be 100-200 W, the heat treatment temperature to be 550-600 °C, and the heat treatment time to be 10-20 min to obtain the carbon fluoride cathode material. The electrolyte is composed of lithium tetrafluoroborate, methyl acetate, and dimethyl sulfite. The volume ratio of methyl acetate to dimethyl sulfite is 1:1, and the concentration of lithium tetrafluoroborate is 1 mol / L. The battery of the present invention can stably operate in the range of -100 °C to 100 °C.

The present application relates to the technical field of lithium-ion batteries, and specifically discloses a thermostatic lithium-ion battery and a formation method thereof. A thermostatic lithium-ion battery includes an inner layer of a SEI membrane and an outer layer of a SEI membrane, wherein the inner layer of the SEI membrane is formed by electrolyte A, and the outer layer of the SEI membrane is formed by electrolyte B; the electrolyte A is 8-18wt% of a lithium salt, 78-91.5wt% of a solvent, and 0.5-4wt% of an additive; the electrolyte B is 6-21wt% of a lithium salt, 75.5-93.5wt% of a solvent, and 0.5-6.0wt% of a sulfur-containing additive; the sulfur-containing additive is one of vinyl sulfate, sulfopropionic anhydride, phenyl sulfone, dimethyl sulfite, or any combination thereof, or any combination thereof with vinylene carbonate. The thermostatic lithium-ion battery formation method of the present application can be used for battery production, and has the advantage of increasing the service life of low-temperature lithium-ion batteries under normal and high temperature environments.

This invention discloses a wide-temperature-range, long-life sodium-ion battery electrolyte, its preparation method, and its applications. The invention uses sodium perchlorate as the sodium salt, synergistically with low-viscosity, low-melting-point methyl acetate to ensure high ionic conductivity of the electrolyte over a wide temperature range. Simultaneously, dimethyl sulfite and fluoroethylene carbonate synergistically construct an inorganic-rich SEI film, significantly improving interfacial stability and cycle performance. The Na||NVP battery, after reversible charge-discharge at 60°C, maintained a discharge specific capacity retention of 88.33% of the initial capacity after 400 stable cycles. Under low-temperature conditions, reversible charge-discharge at currents of 0.1C and 0.3C resulted in stable cycles of 300 and 380 cycles, respectively. The preparation method of this invention is simple, low-cost, easy to implement, requires minimal equipment investment, and is suitable for mass production.

The invention discloses a zinc sulfate electrolyte optimized by dimethyl sulfite and application of the zinc sulfate electrolyte in an aqueous zinc battery, and belongs to the technical field of electrochemical energy storage. Aiming at the problems of zinc dendrite growth, serious corrosion side reaction, short cycle life and the like of the traditional zinc sulfate electrolyte, dimethyl sulfite (DMS) is introduced into a zinc sulfate aqueous solution as a functional additive, and a solvation structure of zinc ions is optimized by utilizing the synergistic effect of ester groups and sulfite radicals in molecules, so that the zinc sulfate electrolyte is prepared. And a compact and stable passivation film is formed on the surface of the electrode in situ, so that dendritic crystal growth, corrosion and hydrogen evolution side reaction of the zinc negative electrode are effectively inhibited. The electrolyte is simple and convenient in preparation process, low in cost and suitable for large-scale preparation of high-performance and long-life aqueous zinc batteries.