34results about How to "Improve electrochemical kinetic performance" patented technology

The invention belongs to the technical field of capacitors, and in particular relates to a preparation method of a self-healing flexible solid supercapacitor. The preparation method of the self-healing flexible solid-state supercapacitor comprises the following steps: (1) preparation of polydopamine-polyacrylamide-sulfuric acid hydrogel; (2) preparation of polyaniline flexible supercapacitor. This method synthesizes hydrogel capacitors in one step, greatly reducing the large interfacial resistance exhibited by electrode materials and electrolytes due to poor contact, and the contact between electrolytes and conducting polymers by providing excellent electrochemical kinetic properties and significant The structural stability improves the performance of supercapacitors.

The invention discloses a polypyrrole-coated sulfur-doped cobalt-based carbon nanocage material, a preparation method and an application thereof, belonging to the technical field of lithium-sulfur batteries, and specifically includes the following steps: preparation of a precursor cobalt-based ZIF‑67, sulfur doping Preparation of heterocobalt-based carbon nanocages, polypyrrole-coated sulfur-doped cobalt-based carbon nanocages (PS‑CNCs). By constructing a carbon nanocage to form an internal hollow structure, it can accommodate more active material sulfur, and limit the volume expansion of sulfur, effectively alleviate the volume expansion problem during the battery reaction process, and increase the service life; sulfur-cobalt co-doping can effectively improve PS‑ The interaction between CNCs and polar polysulfides in the reaction can effectively inhibit the shuttle effect of polysulfides and improve the battery cycle performance; the use of polypyrrole-coated carbon nanocages can significantly improve the conductivity of the material, reduce impedance, and inhibit polarity. to improve battery stability. The method of the invention has low cost, simple operation, obvious effect and is suitable for popularization.

The invention discloses a three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material and a preparation method thereof. The preparation method comprises the following steps of adsorbing Mn<2+> ions onto a carbonyl (-COH-) group in a microgel three-dimensional macromolecular network by adopting poly(acrylamide, acrylic acid) microgel spheres as a template; increasing the pH value of the poly(acrylamide, acrylic acid) microgel spheres so as to in-situ hydrolyze the Mn<2+> ions to generate Mn(OH)2 crystal nucleus, depositing the Mn(OH)2 crystal nucleus into a space formed by the three-dimensional macromolecular network to form nano composite polymer microspheres; placing the obtained nano composite polymer microspheres into a tubular furnace to be calcined at a high temperature in an inert gas atmosphere to prepare the three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material. The positive electrode material has the advantages of excellent high-temperature cycling performance, large multiplying power charging-discharging performance and the like, and can be widely applied to the production of a lithium battery.

The invention relates to a method for preparing an anode material of a lithium battery and aims to provide a method for preparing a conductive carbon film-coated calcium or calcium-tin alloy serving as the anode material of the lithium battery. The method comprises the following steps of: melting high-purity calcium metal or calcium metal and tin metal, spraying into polyethylene glycol liquid byusing high purity argon, and cooling fog drops in the polyethylene glycol liquid to obtain spherical powder; carbonizing polyethylene glycol to obtain a carbon coated calcium material; filtering out the carbon coated calcium material; calcining again in vacuum or high purity nitrogen atmosphere at the temperature of below 700 DEG C; further carbonizing to remove residual polyethylene glycol on the carbon coated calcium material; and cooling to obtain the conductive carbon film-coated calcium serving as the anode material for preparing the lithium battery. A conductive carbon film is formed onthe surfaces of the calcium or calcium-tin alloy particles and is favorable for the stability of an electrode structure. A gas spraying method for preparing the carbon coated material is favorable for scale production and cost reduction.

The invention relates to a battery preparation technology, and aims to provide a method for manufacturing a lithium-sulfur battery. The method comprises the following steps of: grinding a carbon-coated aluminum composite material, acetylene black and polyvinylidene fluoride (PVDF), adding N-methyl pyrrolidone, and regulating to be sticky; mechanically mixing into paste, coating the paste on a penetration hole copper film, and drying in the shade; performing compression molding to obtain a negative electrode of the lithium-sulfur battery; grinding a carbon-coated sulfur composite material, the acetylene black and the PVDF, adding the N-methyl pyrrolidone to form the paste, coating the paste on an aluminum film, and drying in the shade; performing compression molding to obtain a positive electrode of the lithium-sulfur battery; forming a sandwich structure through electrode materials facing the side of the positive electrode and the negative electrode and a partition film which adopts a micro-pore polypropylene film, wherein a lithium film is arranged on one side, abutting against the partition film, of a copper film of the negative electrode,; and dissolving an electrolyte LiClO4 into a mixed solvent of dioxolame and ethylene glycol monomethyl ether. According to the method, a steady charge-discharge voltage platform is adopted; the lithium-sulfur battery is high in electrode reaction reversibility, high in chemical stability and thermal stability, low in cost, easy to prepare, pollution-free, and anti-oxidant; and the safety is improved.