7 results about "Difluoroacetic acid" patented technology

A lithium-ion battery includes an electrolyte, a negative electrode plate and a positive electrode plate. The electrolyte includes a fluorinated solvent, the fluorinated solvent comprises a difluoroethyl acetate; and with a content of the difluoroethyl acetate being f wt % based on a total weight of the electrolyte, and a ratio of a width of the negative electrode plate to a width of the positive electrode plate being g, the lithium-ion battery satisfies a following relation: 2≤f / g≤30.

An electrolyte, a secondary battery, and an electronic device. The electrolyte comprises ethyl 2,2-difluoroacetate, 1,2,3-tris(2-cyanoethoxy)propane, and 1,3-propane sultone. Based on 100 parts by mass of the electrolyte, ethyl 2,2-difluoroacetate accounts for 1.5 to 6 parts by mass, 1,2,3-tris(2-cyanoethoxy)propane accounts for 0.5 to 4 parts by mass, and 1,3-propane sultone accounts for 1 to 5.5 parts by mass. The overcurrent and overtemperature safety of secondary batteries are improved.

An electrolyte. The electrolyte comprises a fluorine-containing ester additive. The ratio of the fluorine-containing ester additive in the electrolyte is 2-9% by mass percentages. The fluorine-containing ester additive comprises 2,2-difluoroethyl acetate, difluoroethylene carbonate and trifluoroethyl methyl carbonate.

This invention provides a battery and an electrical device, including a positive electrode sheet comprising a positive electrode active material, the positive electrode active material being doped with and / or coated with aluminum; a negative electrode sheet comprising a negative electrode active material, the negative electrode active material comprising silicon particles; an electrolyte comprising a first solvent, a second solvent, a first additive, a second additive, and a third additive; the first solvent comprising ethyl 2,2-difluoroacetate, the second solvent comprising propylene carbonate, the first additive comprising 1,3-propanesulfonate lactone, the second additive comprising vinyl sulfate, and the third additive comprising succinate; this invention, through the synergistic design of a full battery system of "aluminum-modified positive electrode + silicon-based negative electrode + multifunctional composite electrolyte," achieves excellent low-temperature discharge performance, ultra-long cycle life, high interface stability, and outstanding thermal safety characteristics while maintaining high energy density.

This invention provides a battery and an electrical device, comprising a positive electrode sheet including a positive active material, the positive active material being doped with and / or coated with aluminum; a negative electrode sheet including a negative active material, the negative active material including silicon particles; and an electrolyte including a first solvent, a second solvent, a first additive, and a second additive; the first solvent including ethyl 2,2-difluoroacetate, the second solvent including a chain-like fluorosulfonamide compound, the first additive including mannitol carbonate sulfate, and the second additive including fluoroethylene carbonate. This invention, through the introduction of aluminum into the positive active material, the use of silicon particles in the negative active material, and the synergistic design with the multi-component solvent and additives in the electrolyte, achieves a comprehensive improvement in the battery's cycle performance, interface stability, and safety, making it particularly suitable for high-energy-density lithium-ion battery applications.

This application relates to a battery and an electrical device. The battery includes a positive electrode, a negative electrode, a separator, and an electrolyte; the positive electrode active material layer includes aluminum; the separator includes an oxide solid electrolyte coating; the electrolyte includes a solvent, an additive, and a lithium salt; the solvent includes a first solvent and a second solvent; the additive includes a first additive and a second additive; the first solvent includes propylene carbonate and / or ethylene carbonate, and the second solvent includes ethyl 2,2-difluoroacetate and / or trifluoroethyl methyl carbonate; the first additive includes mannitol sulfate, and the second additive includes ethylene sulfate; 0.08≤(A+C+D)×10000 / X≤0.77; 0.05≤(C+D)×100 / (B+W)≤2.77; 3.23≤(C+H) / B≤63.97. The solution provided in this application results in a battery exhibiting excellent thermal shock safety and high and low temperature cycling performance.

This invention relates to the field of organic synthesis, specifically to a method for the preparation of difluoroenones and their in-situ reaction with amines, alcohols, etc., to convert them into the corresponding difluoroacetamides and difluoroacetic acid esters. The invention involves sequentially adding potassium fluoride, an amine or alcohol, and a difluorobromoacrylsilyl compound to a reaction solvent under a nitrogen atmosphere to obtain a mixture. This mixture is stirred at 25°C until the reaction is complete, filtered, and purified to obtain the difluoroacetamide or difluoroacetic acid ester compound. The preparation method of this invention is simple to operate (highly reactive difluoroenones are generated in situ and participate in the reaction), achieving efficient synthesis of difluoroacetamide / difluoroacetic acid esters and avoiding the use of highly volatile difluoroacetyl chloride. The difluorobromoacrylsilyl used in this invention can be conveniently prepared on a large scale and can be purified by distillation. The reaction conditions involved in the preparation method of this invention have good substrate tolerance and can be applied to aliphatic amines, aromatic amines, and various primary and secondary alcohols.