34results about How to "Quarantine direct contact" patented technology

The invention discloses a mixed polymer-coated core-shell composite positive electrode material, a preparation method thereof and application in a lithium ion battery. The composite positive electrodematerial comprises a positive active material core and a mixed polymer shell, wherein the mixed polymer shell is coated on a surface of the core and comprises a mixture of a conductive polymer and anorganic solid polymer. The method comprises the steps of 1) mixing polyethylene oxide and lithium hexafluorophosphate, and performing ball-milling to obtain a mixture A; 2) mixing the positive activematerial and a coupling agent, and performing dry ball-milling to obtain a mixture B; and 3) mixing the mixture A, the mixture B and the conductive polymer, and performing dry ball-milling and calcination to obtain the core-shell composite positive electrode material. The coating layer of the composite positive electrode material can be compatible with electron conductivity and lithium ion conductivity of the material, the internal resistance of the electrode material is effectively reduced, moreover, two materials in the coating layer are high in compatibility, and the coating uniformity isimproved.

The invention provides a lithium-ion battery composite positive electrode material, including a ternary material matrix LiNi x co y m 1‑x‑y o 2 And the iron phosphate transition layer and the lithium iron phosphate coating layer coated on the surface of the substrate, the lithium iron phosphate coating layer is coated on the surface of the iron phosphate transition layer; the composite positive electrode material The general formula is expressed as: LiNi x co y m 1‑x‑y o 2 ·aFePO z · bLiFePO 4 . The present invention also provides a preparation method of a lithium-ion battery composite cathode material, the steps comprising: adding iron salt and phosphate into water to obtain a uniform dispersion; adding ternary materials to a dispersion medium to obtain a uniform suspension; Then obtain a slurry uniformly mixed with the two liquids, dry to obtain a precursor, and sinter to obtain a ternary material coated with iron phosphate; after uniformly mixing it with a lithium salt and a carbon source, sinter in an inert atmosphere to obtain a composite positive electrode material for a lithium-ion battery.

The invention discloses a method for preparing a water-soluble molecular self-assembly film type metal protective agent. The method comprises the following steps: A, mixing water and an organic solvent of which the mass ratio is (0.5-1.5);10, uniformly stirring, and preparing a mixed solvent; B, adding an emulsifier which accounts for 30-50 percent of the mass of the mixed solvent in the step A, uniformly stirring, and preparing a mixture; C, adding a film agent which accounts for 12-20 percent of the mass of the mixture in the step B, uniformly stirring, and further preparing a mixed solution; and D, adding a surfactant which accounts for 1.5-2.0 percent of the mass of the mixed solution and a reducing agent which accounts for 0.1-0.5 percent of the mass of the mixed solution in the step C, heating under water bath conditions at the temperature of 51-58 DEG C, controlling the temperature of the mixed solution, continuously stirring for 90-150 minutes, thereby obtaining the water-soluble molecular self-assembly film type metal protective agent. The method is simple in process, low in energy consumption and environmental friendly, a molecular self-assembly film can be formed on the metal surface through the protective agent, and the metal is effectively prevented from discoloring. The method is simple in process and large-scale production is easy to realize.

The invention discloses a lithium ion battery with adoption of secondary electrolyte injection, comprising a positive pole, a negative pole, a diaphragm, an electrolyte and an outer package. In the process of manufacturing the battery, the secondary electrolyte injection is adopted; the electrolyte solvent in the first electrolyte injection is one or a combination of more than one of EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), Gamma-BL (butyrolactone), MF (methyl formate), MA (methyl acetate), EP (ethyl propionate) and THF (tetrahydrofuran) and does not contain acetonitrile and propionitrile; the secondary electrolyte injection is conducted after the formation; and the used electrolyte in the secondary electrolyte injection contains at least one of the acetonitrile and the propionitrile. The electrolyte containing the at least one of the acetonitrile and the propionitrile has the advantage of high normal-temperature conductivity (10-50mS / cm) and low-temperature conductivity (4-20mS / cm at the temperature of -20 DEG C), thereby exceeding the level of an existing electrolyte.

The invention discloses a gradient single crystal cathode material, the chemical formula of the single crystal cathode material is LiNi x co y A 1‑x‑y o 2 @mLi a Z b o c , where 0