CAS:58244-27-2，Trifluoroethoxy methane

The invention discloses a local high-concentration electrolyte suitable for a potassium ion battery, the local high-concentration electrolyte is composed of a high-concentration ether electrolyte and a functional fluorinated diluent, the high-concentration ether electrolyte is preferably composed of potassium bis (fluorosulfonyl) imide and ethylene glycol dimethyl ether, the concentration of the high-concentration ether electrolyte is 3-6 mol/L, and the concentration of the functional fluorinated diluent is 3-6 mol/L; preferably, the functional fluorinated diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether, and the volume ratio of the functional fluorinated diluent to the functional fluorinated diluent is (2: 1)-(1: 8). The specific combination not only can significantly improve the viscosity and fluidity of the high-concentration ether electrolyte and the electrode wettability, but also can change the solvation structure and molecular energy level of potassium ions in the electrolyte. The formation of a solid electrolyte layer on the surface of the phosphorus/carbon negative electrode is effectively regulated and controlled; and the electrochemical reversibility, the cycling stability and the rate capability in the potassium storage process are improved. The local high-concentration electrolyte is further applied to a potassium ion total battery composed of a phosphorus/carbon negative electrode and a purified 3, 4, 9, 10-perylenetetracarboxylic dianhydride positive electrode, and long cycle life and high coulombic efficiency can be achieved.

The invention discloses a synthesis method of tris (trifluoroethoxyl) methane, which comprises the following steps: sequentially adding a first catalyst, a second catalyst and sodium trifluoroethoxide into a solvent, heating to a reaction temperature, then adding trichloromethane, after the trichloromethane is added, keeping the reaction temperature, and after the reaction is finished, purifying to obtain the product tris (trifluoroethoxyl) methane, the first catalyst is selected from anhydrous sodium dihydrogen phosphate and anhydrous disodium hydrogen phosphate; the second catalyst is selected from copper sulfate pentahydrate, cuprous chloride, cuprous bromide and cuprous iodide; the solvent is a mixed solvent of water and a polar aprotic organic solvent which is mutually soluble with the water. The method has the advantages that 1, the operation is simple, the reaction time is short, and the post-treatment is convenient; 2, the yield and the product purity are high, and industrial large-scale production is facilitated.

The invention relates to a high-voltage fast-charging electrolyte and a dual-ion battery, and belongs to the technical field of batteries. The technical problems that in the prior art, commercial electrolyte is poor in high voltage resistance to the dual-ion battery, the capacity fading is fast when the commercial electrolyte is applied to the battery, the coulombic efficiency is low, and the compatibility with the positive electrode and the negative electrode is poor are solved. The oxidation resistance of the electrolyte is improved by carrying out fluorination regulation on the main solvent ethylene carbonate (EC), so that the electrolyte can operate in a high-voltage environment, the synergistic solvation of anions is realized by matching with the main solvent propylene carbonate (PC), the anions can realize high-efficiency intercalation and deintercalation of a graphite positive electrode in a solvent co-intercalation manner, and the high-efficiency deintercalation of the graphite positive electrode is realized. And meanwhile, as a desolvation process is omitted, the battery can run well under the conditions of high magnification and low temperature. The high-voltage fast-charging type electrolyte has a wide electrochemical window and good compatibility with a positive electrode and a negative electrode, and the cycle life of a high-voltage fast-charging type dual-ion battery is greatly prolonged.