54results about How to "Uniform surface coating" patented technology

The invention provides a conducting-polymer dipped and coated lithium-ion battery composite-electrode material and a preparation method thereof. A high-polymer conducting polymer is coated on the lithium-ion battery electrode material of the composite electrode material, the conducting polymer is the conducting polymer which is easily dispersed into an aqueous solution, and the aqueous solution of dispersants, such as polystyrolsulfon acid and the like is used as a dispersing medium. The composite electrode material is prepared through the following steps of: dipping a lithium-ion anode material or cathode material into the aqueous solution of the high-polymer conducting polymer, and obtaining the surface-coated lithium-ion battery composite-electrode material through dipping and coating processing. The composite electrode material has cheap preparation raw materials, the surface of the novel composite electrode material is uniformly coated, and the composite electrode material has the advantages of high specific capacity, high charging and discharging efficiency and long cycling life. Compared with the prior art, the preparation method of the composite electrode material has the advantages of simple process, low cost, good effect and green and environment-friendly production process, is easy for industrial popularization and is convenient for large-scale industrialized production.

The invention provides a preparation method of an alumina composite nickel-cobalt lithium manganate ternary material. The preparation method comprises the following steps: (1), preparing liquor A; (2), preparing liquor B; (3), installing and configuring a reaction flask; (4), adding the liquor A and the liquor B into the reaction flask to participate in hybrid reaction; (5), preparing liquor C, and adding into the flask for reaction; (6), obtaining a precursor by suction-filtering, washing and drying; and (7), mixing and roasting the precursor with a lithium source to prepare the alumina composite nickel-cobalt lithium manganate ternary material. The preparation method disclosed by the invention has the beneficial effects that firstly, liquid-phase coating is adopted, production preparation period is short, efficiency is high, and coating and dispersing are uniform; secondly, the coating layer alumina on the surface of the ternary material is a film with an amorphous structure, so that charging and discharging voltage difference is reduced, multiplying power performance and high-performance performance of the material are improved; and thirdly, characteristics of a solid-liquid phase interface among an anode material, electrolyte and a diaphragm are improved by alumina film-coating, so that velocity and efficiency of electrochemical reaction are improved.

A preparation method of copper-clad iron composite powder which includes procedures as follow: the alcaline etching waste liquor containing copper is added into the acid etching waste liquor, thus feed solution with pH between 2 and 4.5 is obtained and the concentration of copper between 50 and 100g / L. The reduced iron powder is washed by acid, delivered to a reaction kettle with turbine type stirring, added with water with stirring, added orderly with dispersant agent and inhibitor and evenly with feed solution containing copper with continuous stirring, making the copper completely claddingthe surface of the iron powder grain, thus copper-clad iron composite powder is obtained. Then the copper-clad iron composite powder is subject to pumping filtration, washing, centrifugal dehydration,antioxidation treatment, vacuum drying and screen separation, thus termination production is obtained. The method of the invention can make the copper evenly, tightly, firmly and completely claddingthe iron powder grain, and not be oxidized for six months of storage, thus increasing the oxidation resistance. The prepared copper-clad iron powder by the invention has bright surface colour and lustre, high cladding rate, even and compact surface cladding, futhermore, the cost is lower compared with prior preparation methods because of avoiding using copper sulfate.