5 results about "Cobalt aluminate" patented technology

The invention relates to the field of refractory materials, in particular to a La2O3-containing refractory material and a preparation method thereof. The problems that an existing refractory material is low in compression strength and breaking strength, poor in thermal shock resistance and high in apparent porosity are solved. The refractory material is prepared by taking calcium oxide, silicon dioxide, magnesium oxide, aluminum oxide, ferric oxide and lanthanum oxide as base materials and adding strontium cobalt aluminate to coat cerium magnesium aluminum chromium powder, and potassium chloride and sodium chloride are used as molten salts to prepare the cerium magnesium aluminum chromium powder through a dissolution-reprecipitation mechanism. Citric acid monohydrate, strontium acetate, cobalt nitrate hexahydrate and aluminum nitrate form a stable complex, strontium cobalt aluminate is obtained through high-temperature treatment, cerium-magnesium-aluminum-chromium powder is coated with the strontium cobalt aluminate through a first solution, the volume density, thermal shock resistance and mechanical strength of the refractory material are improved, and the strict requirements of high-temperature industry for the high-performance refractory material are met.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive pole current collector and a positive pole material layer arranged on at least one surface of the positive pole current collector, the positive pole material layer comprises nickel cobalt lithium aluminate, based on the mole number of metal elements except lithium in the positive pole material layer, the molar percentage content of the aluminum element is C1%, and C1 is more than or equal to 2 and less than or equal to 20; the electrolyte comprises a first component, and the first component is at least one of lithium difluorophosphate, lithium tris (pentafluoroethyl) trifluorophosphate or lithium trifluoroacetate; based on the mass of the electrolyte, the mass percentage content of the first component is m1%, and m1 is larger than or equal to 0.2 and smaller than or equal to 6. The secondary battery provided by the invention can give consideration to high-temperature cycle performance, high-temperature storage performance and dynamic performance.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive pole current collector and a positive pole material layer arranged on at least one surface of the positive pole current collector, the positive pole material layer comprises nickel cobalt lithium aluminate, based on the mole number of metal elements except lithium in the positive pole material layer, the molar percentage content of the aluminum element is C1%, and C1 is more than or equal to 2 and less than or equal to 20; the electrolyte comprises a first component, based on the mass of the electrolyte, the mass percentage content of the first component is m1%, and m1 is larger than or equal to 0.01 and smaller than or equal to 5. The secondary battery provided by the invention can give consideration to low-temperature discharge performance, low-temperature cycle stability and high-temperature storage performance.

This invention relates to a mullite fiber modified ceramic mold shell and its preparation method. The preparation method of the mullite fiber modified ceramic mold shell includes the following steps: (1) placing a wax mold in a surface slurry, coating it with slurry, and then sapping it with sand to obtain a surface mold shell; the raw materials of the surface slurry include silica sol, mullite fiber, cobalt aluminate, and zircon powder; (2) placing the surface mold shell obtained in step (1) in a back slurry, coating it with slurry, and then sapping it with sand to obtain a back mold shell; the raw materials of the back slurry include silica sol, mullite fiber, and zircon powder; (3) dewaxing the back mold shell obtained in step (2) and then calcining it to obtain the mullite fiber modified ceramic mold shell. The preparation method provided by this invention can improve the structural strength of the ceramic mold shell and maintain good air permeability and high temperature stability, while significantly reducing the amount of raw materials used and saving production costs.

The invention belongs to the technical field of battery materials, and particularly relates to a coated modified nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The lithium nickel cobalt aluminate positive electrode material comprises an inner core and a coating layer coated on the inner core, a is greater than or equal to 1.01 and less than or equal to 1.05, x is greater than or equal to 0.75 and less than or equal to 0.90, y is greater than or equal to 0.05 and less than or equal to 0.20, z is greater than or equal to 0.01 and less than or equal to 0.05, and p is greater than or equal to 0 and less than or equal to 0.05; l comprises one of Mg, Zr, Mo, Ti and Zn; and the tap density of the coated and modified nickel cobalt lithium aluminate positive electrode material is 2.7-3.2 g / cm < 3 >. The coated modified nickel cobalt lithium aluminate positive electrode material provided by the invention has relatively good electronic conductivity and rate capability, and can inhibit lattice collapse caused by phase change under high voltage, reduce intergranular gaps, enhance thermal stability of the material, inhibit capacity fading caused by structure looseness in charge and discharge processes, and prolong the cycle life of a battery.