3results about How to "Enhanced nucleophilicity" patented technology

This invention belongs to the field of acyclic compound technology, specifically relating to a method for preparing tert-amyl peroxide. A tert-amyl hydrogen peroxide aqueous solution is added to a solvent and stirred to obtain a mixed solution. Under stirring conditions, p-toluenesulfonic acid and ferric phosphide are added sequentially to the mixed solution. After the addition is complete, stirring continues to produce reaction solution I. Under stirring conditions, acetic anhydride is added to reaction solution I. After the addition is complete, stirring continues to produce reaction solution II. A washing solution is added to reaction solution II, and the mixture is stirred and washed, then separated to obtain crude tert-amyl peroxide. The crude tert-amyl peroxide is washed, dried, and the solvent is removed to obtain tert-amyl peroxide. This invention avoids the problems of large amounts of hydrochloric acid produced by traditional acyl chloride methods and the corrosiveness caused by using sulfuric acid as a catalyst. Furthermore, ferric phosphide is magnetic, allowing for recycling through magnetic separation after the reaction. p-Toluenesulfonic acid can be regenerated through ion exchange resin, significantly reducing production costs.

This invention relates to the field of lithium battery material recycling technology, specifically to a method for recycling and utilizing cathode materials from retired lithium iron phosphate batteries. The recycled retired lithium iron phosphate battery cathode materials are crushed, and the fragments are soaked in a solvent with stirring. After filtration, the filter residue is repeatedly washed with deionized water and dried to obtain coarse powder of the recycled cathode material. The coarse powder is subjected to ICP testing, and lithium, iron, phosphorus, grinding aids, and anhydrous ethanol are added for wet ball milling. After ball milling, the powder is dried to obtain a precursor. The precursor is then sintered under a nitrogen atmosphere to obtain the lithium iron phosphate cathode material. This method for recycling retired lithium iron phosphate battery cathode materials is simple, environmentally friendly, and economically efficient. The recycled cathode material meets the requirements for use in the battery industry.

This invention belongs to the field of lithium-ion battery material preparation technology, and discloses a one-step method for preparing lithium bis(fluorosulfonyl)imide using ionic liquid catalysis and hydrogen fluoride. This method solves the problems of low catalytic efficiency, insufficient product purity, difficult separation, and high environmental impact in existing preparation routes. Using bis(fluorosulfonyl)imide and lithium fluoride as raw materials, anhydrous hydrogen fluoride as the fluorinating agent, and an imidazole-based ionic liquid as the catalyst, under an inert atmosphere, the reaction system is prepared, followed by an integrated fluorination-lithiation reaction and post-treatment purification steps to obtain high-purity lithium bis(fluorosulfonyl)imide. This invention achieves efficient reaction under mild conditions through the synergistic effect of a specific ionic liquid and hydrogen fluoride gas, solving the problems of harsh reaction conditions, low yield, and insufficient purity in existing processes. The product yield is ≥92%, and the purity is ≥99%. The process is simple, safe, and environmentally friendly, suitable for large-scale industrial production, and can be widely used in the preparation of lithium-ion battery electrolytes.