3 results about "Dimethyl sulfite" patented technology

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℃.

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.