62results about How to "Improve charge and discharge stability" patented technology

The invention relates to a nickel cobalt oxide/carbon nanotube composite catalyst, a preparation and an application thereof. The bi-functional catalyst comprises carbon nanotube and nickel cobalt oxide NiCo2O4 spinel; according to the preparation, nickel acetate, cobalt nitrate and carbon nanotube are respectively weighed, and then dissolved in ammoniacal liquor and the obtained material is performed with ultrasonic dispersion, then is subjected to a hydrothermal reaction at temperature of 140-160 DEG C for 3-6 hours, the obtained product is cooled to room temperature, cleaned and dried, calcined and ground to obtain the bi-functional catalyst. The invention also provides an application of the bifunctional catalyst in preparation of an air electrode of a metal air battery. The bi-functional catalyst has efficient oxygen reduction performance and efficient oxygen evolution performance in air.

The present invention relates to a flexible supercapacitor with with NiS-MoS2 heterogeneous nano-sheet array structure based on carbon cloth loading and a preparation method thereof, belonging to thetechnical field of new energy material and device preparation. The flexible supercapacitor grows high-purity, high-density and high-orientation carbon cloth-loaded NiS-MoS2 heterogeneous nanosheet array by using anode material, carbon cloth coated with activated carbon as cathode material, PVA/KOH gel as diaphragm and electrolyte respectively. The anode has the advantages of high purity, high density, tidy appearance, strict controllable growth condition, simple equipment and process, low cost, high capacitance and good charge-discharge stability. The cathode material has excellent conductivity and large double-layer capacitance. The preparation process of the capacitor is simple, economical and environmentally friendly, and no post-treatment is needed. The supercapacitor provided by the invention has the advantages of light weight, large capacity, good cycle charging and discharging stability, and good flexibility, and can be used for power supply equipment of wearable electronic devices.

The invention relates to a Ti3C2/NiCo2O4 composite electrode material and a preparation method thereof. The mass ratio of Ti3C2 to NiCo2O4 in a composite electrode is 1 : 0.5 to 1 : 3. The preparationmethod comprises the steps of (1) dispersing pretreated Ti3C2 powder in an ethylene glycol solution; then adding cobalt salt, nickel salt and a surfactant, carrying out stirring, then adding urea, and continuing to carry out full stirring to obtain a turbid liquid; (2) carrying out a hydrothermal reaction on the turbid liquid obtained in the step (1) at 160-200 DEG C for 2-16 hours; and (3) calcining a product obtained in the step (2) at 300-400 DEG C for 1-4 hours to prepare the Ti3C2/NiCo2O4 composite powder material. In the composite material prepared with the method, NiCo2O4 nanoparticlesare uniformly distributed on the surfaces and the interlayers of layered Ti3C2 particles to form a stable Ti3C2/NiCo2O4 nano-composite structure; and the composite material has relatively large specific capacitance and relatively high charge-discharge stability.

The invention discloses a preparation method for an electroactive polypyrrole film. The preparation method comprises the following steps of: preparing an aqueous solution of single pyrrole, an electrolyte solution and a protonic acid solution; secondly, mixing the three solutions; and obtaining a polypyrrole film electrode material on a conducting substrate by using a unipolar pulse electric polymerization. According to the preparation method disclosed by the invention, the operation is simple; products are easily obtained; no oxidant is needed; and the secondary pollution caused by the oxidant is avoided. The polypyrrole film electrode material prepared by the method in a neural solution has higher discharging stability.

The invention discloses a nanoflower nickel hydroxide nanosheet/manganese-cobalt oxide composite electrode material and a preparation method thereof. The nanoflower nickel hydroxide nanosheet/manganese-cobalt oxide composite electrode material takes MnCo<2>O<4.5> nanoflower as a core, nickel hydroxide nanosheets are uniformly grown on a surface of the core, so that the nanoflower nickel hydroxidenanosheet/manganese-cobalt oxide composite electrode material which has high specific capacity and charge-discharge stability and does not need a binding agent and a conductive agent is prepared, andthe nanoflower nickel hydroxide nanosheet/manganese-cobalt oxide composite electrode material can be used for the field of supercapacitors, is simple in preparation process and high in repeatability and is convenient to operate.

The invention discloses a carbon-loaded FeO/MnO2 spinel bifunctional catalyst and a preparation method and application thereof. The catalyst comprises carbon nanotubes and FeO/MnO2 spinel. The preparation method comprises dissolving potassium permanganate in water, adding concentrated hydrochloric acid into the solution, carrying out a hydrothermal reaction process for 12h to obtain a manganese dioxide precursor, dissolving the manganese dioxide precursor, ferric nitrate and carbon nanotubes in ammonia water, carrying out ultrasonic dispersion and a hydrothermal reaction process, cooling the product to the room temperature, and then carrying out cleaning, drying and calcination to obtain the bifunctional catalyst. The carbon-loaded FeO/MnO2 spinel bifunctional catalyst has high efficiency oxygen reduction performances and high efficiency oxygen evolution performances in air. A metal-air battery using the carbon-loaded FeO/MnO2 spinel bifunctional catalyst has excellent power generation performances and excellent charging-discharging characteristics and circulation stability.

The invention relates to the technical field of a lithium ion cathode material, and discloses a tremelliform hollow core-shell structure vanadic anhydride positive electrode plate and its button lithium ion battery preparation method. The synthesized tremelliform hollow core-shell structure C-coated V2O5 cathode material has advantages of high reversible capacity, good cycle performance, and highcharge and discharge efficiency, and also has the advantages of low collecting cost and environmental protection. The preparation method of the tremelliform hollow core-shell structure C-coated V2O5 cathode material has the advantages of simple process and easy operation.

The invention relates to the technical field of lithium ion cathode materials and discloses a tremella-like V2O5 lithium ion battery cathode material adopting a hollow core-shell structure and a preparation method of the cathode material. The tremella-like V2O5 lithium ion battery cathode material adopting the hollow core-shell structure is prepared from raw materials including ethyl orthosilicate, m-dihydroxybenzene, formaldehyde, ammonium metavanadate and the like with a simple hydrothermal method. The electrical conductivity and stability of the existing V2O5 cathode material are greatly improved by the tremella-like hollow core-shell structure C@V2O5 with the special morphology, so that the electrochemical performance of the cathode material is significantly improved. The specific surface area is enlarged and the electrochemical performance is improved due to the tremella-like morphology. The electrical conductivity of the material is improved due to existence of hollow carbon spheres. The stability of the material is greatly improved by the hollow structure.

The invention discloses a high-capacitance polyindole nitrogen-doped porous carbon material and a preparation method thereof, and belongs to the technical field of processing of a carbon material. The high-capacitance polyindole nitrogen-doped porous carbon material comprises the following constituents based on parts by weight: 10-30 parts of indole compound, 30-90 parts of oxidizing agent, 60-180 parts of activating agent and 300-1,000 parts of solvent. The nitrogen-doped porous carbon material provided by the invention has the characteristics of relatively high nitrogen-doped quantity, large-pore diameter distribution, high charge-discharge stability, high-rate performance and high specific capacitance value.

The invention relates to a sodium-sulfur battery positive electrode material and a preparation method therefor. The sodium-sulfur battery positive electrode material is compounded by a metal organic framework material and sublimed sulfur; the mixing mass ratio of the metal organic framework material to sublimed sulfur is 1:1 to 1:4, and the loading capacity of sulfur is 60-75%; the preparation method comprises the following steps of a), performing heat treatment on the metal organic framework material to obtain a graphitized porous material; and b) performing mixing and grinding on the graphitized porous material obtained in the step a) and sublimed sulfur, and then performing heat treatment to permeate sulfur into the interior of the porous material to obtain the sodium-sulfur battery positive electrode material. Compared with the prior art, mesopores are loaded with the majority of active materials, so that diffusion of polysulfide ions can be suppressed, and dissolving-out of polysulfide in a circulation process can be effectively limited; meanwhile, the positive electrode material is large in the specific surface area, so that a relatively large reaction interface can be provided, and a certain effect of sulfur and polysulfide adsorption is also played; and the preparation method is a one-step method, so that the technological steps are simple.

The invention provides a rare-earth doped nickel, cobalt and manganese ternary material wide temperature lithium ion battery and a production method thereof. The production method comprises the following step: producing lithium salt, nickel salt, manganese salt, cobalt salt and rare earth nitrate according to a specific ratio through a special process, so as to obtain the rare-earth doped nickel, cobalt and manganese ternary material wide temperature lithium with the anode materials being LiNi0.5Co0.3Mn0.2Bd0.2 compound. A rare earth neodymium element is added into the anode materials nickel, cobalt and manganese of the lithium ion battery, the crystal structures of the anode materials are maintained, and a lattice constant C is only changed. The battery produced through the method has high reversible capacity, high cycle performance and high discharge capability, is wide in applicable temperature range, and can be used at minus 45 DEG C.

The invention relates to a rechargeable metal-air battery with a bifunctional carbon catalysis material as an air electrode. The rechargeable metal-air battery adopts the bifunctional carbon catalysismaterial as the air electrode and tinsel as a negative electrode, and the loading capacity of the bifunctional carbon catalysis material is 1-7 mg/cm<2>. The bifunctional carbon catalysis material has efficient oxygen reduction and oxygen evolution electrochemical performances, has an excellent power generating performance and an excellent charge and discharge stability, and can be used in the field of zinc-air batteries, aluminum-air batteries, magnesium-air batteries and other rechargeable metal-air batteries as an excellent air electrode catalyst.

The invention discloses a lithium sulfur battery charge and discharge management method which includes: during lithium sulfur battery charge and discharge, timely detecting the capacity and voltage of lithium sulfur batteries; in each charge and discharge circulation of lithium sulfur batteries, controlling the reduction degree of the capacity of the lithium sulfur batteries relative to that of the lithium sulfur batteries at beginning of a charge and discharge circulation within 40%; controlling the voltage of the lithium sulfur batteries between an upper charge limit threshold and a lower charge limit threshold. The invention further discloses a repair method of the lithium sulfur batteries. The lithium sulfur battery charge and discharge management method and the repair method can effectively improve the charge and discharge stability of the lithium sulfur batteries and prolong the service lives of the lithium sulfur batteries.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of an ultralow-temperature lithium ion battery which can normally work at the temperature of minus 60 DEG C. The lithium ion battery is prepared by taking the lithium iron phosphate coated with mesoporous carbon as a cathode material and by taking a hard carbon material rich in amesoporous structure prepared by an electrostatic spinning technology as an anode material and is assembled by an electrolyte prepared by a LiTFSi salt and a (Diox+EC+VC) solvent. The battery material has good ion transmission characteristic and quick desolvation of the lithium ions, can keep the performance of the good low-temperature electrolyte in a low temperature, and can ensure that the battery can still work normally at the temperature of minus 60DEG C.

The invention relates to a bio-ene charcoal material and a preparation method thereof. According to the invention, a powdery biomass raw material is impregnated with a mixed water solution of phosphoric acid and sulfate; filtering is carried out, and the obtained material is dried by dipping; the material is activated for 60-150min under a temperature of 200-500 DEG C in a protective atmosphere; the activated biomass raw material is heated to a temperature of 1000 DEG C in a protective atmosphere, and the temperature is maintained for 10-40min; the material is heated to a temperature of 1200-1400 DEG C, and the temperature is maintained for 10-30min, such that the biomass raw material is catalytically charred, and an intermediate product is obtained; the obtained intermediate product is cooled, and is washed with ultrapure water; filtering is carried out, and the obtained product is dried; a mixed water solution of hydrochloric acid and/or hydrofluoric acid and ethylenediaminetetraacetic acid is used for dusting and for carrying out an activation treatment for 60-120min; filtering is carried out; and the obtained material is heated and dried, and is crushed, such that the bio-ene charcoal material is obtained. The XRD diagram of the material shows diffraction peak at 26 DEG, such that the material is a charcoal material with a graphitized structure. The material has the characteristics of high specific surface area, developed cavities, good conductivity, high electrochemical activity, and good charge and discharge stability.

The invention discloses a high-energy-storage self-supporting PEDOTs:PSS composite film and a preparation method thereof, which belong to the technical field of composite material processing. The high-energy-storage self-supporting PEDOTs:PSS composite film comprises the following components in parts by weight: 10-30 parts of PEDOTs:PSS, 0.1-0.6 part of metallic oxide, and 300-800 parts of organic solvent. The thickness of the flexible self-supporting composite film ranges from 2.0 to 10 microns. The PEDOTs:PSS composite film provided by the invention has the advantages of high flexibility, high mechanical property, high energy density, and high charge and discharge stability.

The invention relates to a preparation method of a 3D porous nitrogen-doped graphene film electrode, and relates to the technical field of graphene. Oxidized graphene is reduced to nitrogen-doped graphene in a one-step method, and large and small nitrogen-doped graphene sheets are mixed according to certain proportion, stirred to a uniform state, and dissolved in an ethanol solution; and a nitrogen-doped graphene film is prepared via vacuum pumping filtration, a vacuum device is removed the moment there is no free water on the film to be filtered, the nitrogen-doped graphene film is then placed in a low-temperature lyophilizer and dried for certain time, and the nitrogen-doped graphene film is peeled from the filtering film completely. A close packing structure of a traditional graphene film is changed, the prepared nitrogen-doped graphene film includes a 3D porous structure and can be widely applied in the energy storage field.

The invention belongs to the technical field of lithium ion battery materials, and particularly discloses a high-nickel cobalt-free lithium ion battery material and a preparation method thereof. The preparation method comprises the following steps: preparing gel from a lithium source, a nickel source, an R source, a zirconium source and a manganese source through a gel method, and then drying and calcining the gel to prepare the high-nickel cobalt-free lithium ion battery material. According to the high-nickel cobalt-free lithium ion battery material, the aluminum element and/or the rare earth metal element are doped and play a synergistic modification role with the zirconium element, so that the stability of a battery prepared from the high-nickel cobalt-free lithium ion battery material is improved, and meanwhile, the high chemical activity of the battery is also guaranteed.