32results about How to "Alleviate structural collapse" patented technology

The invention relates to a preparation method and an application of a carbon-coated manganese selenide hollow cubic three-dimensional material, and belongs to the technical field of new energy storagematerials. The preparation method specifically comprises the following steps: preparing a manganese carbonate cube by using a hydrothermal method; and carrying out liquid-phase selenylation on the prepared manganese carbonate cube, coating the cube with dopamine and calcining the cube to obtain the carbon-coated manganese selenide hollow cubic three-dimensional material. The material can be usedas a lithium ion battery negative electrode material, shows relatively high theoretical specific capacity and relatively long cycle performance, and also has excellent rate capability. Therefore, thematerial has great application and research prospects in the aspects of preparation and lithium storage performance of lithium ion battery anode materials.

The invention relates to a graphite composite anode material and a preparation method thereof. The graphite composite anode material is of a core-shell structure and comprises an inner core and an outer shell, wherein the inner core is graphite; the outer shell is a nitrogen and phosphorus-doped composite material layer; the nitrogen and phosphorus-doped composite material layer is formed by adding the graphite serving as a raw material into nitrogen-containing ionic liquid in which a phosphorus-containing organic compound, a surfactant and lithium salt are dispersed and sintering; the mass ratio of the phosphorus-containing organic compound to the surfactant to the lithium salt to the nitrogen-containing ionic liquid is (10-50):(1-5):(1-5):200. The graphite composite anode material provided by the invention has the advantages that the transmission rate of lithium ions under the condition of high magnification can be improved, and the compatibility of the graphite composite anode material with an electrolyte can also be improved, so that the cycle performance is improved; the lithium salt in the outer shell can provide sufficient lithium ions, so that the first-time efficiency and the cycle performance are improved.

The invention belongs to the field of battery electrode materials and relates to a preparation method and application of a flower-shaped FeSx / C nano composite material. The invention adopts one-step hydrothermal method, realizes the synthesis of flower-shaped FeSx / C composite material by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature, and uses the flower-shaped FeSx / C composite material as a negative electrode material for sodium ion battery, wherein the flower-shaped FeSx / C composite material is synthesized by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature. The preparation method of the invention has the advantages that raw materials are easy to obtain, the synthesis method is simple and feasible, the carbon coating effect is good and the repeatability is strong, and the FeSx / C composite material prepared by the invention is used as the negative electrode material of the sodium ion battery, so that the specific capacity of the battery can be effectively improved, and the stability and the rate performance of the battery can be enhanced.

The invention discloses a graphene-wrapped double metal selenide material, a preparation method and an application thereof. The preparation method comprises the following steps: (1) performing solvothermal reaction of cobalt salt, nickel salt, polyvinylpyrrolidone and trimesic acid in a solvent to obtain a reaction product NiCo-MOF; (2) subjecting NiCo-MOF to selenium oxidation and carbonization treatment to obtain the product NiCoSe 4 ; (3) NiCoSe 4 Solvothermal reaction with graphene oxide GO to obtain graphene-wrapped double metal selenide materials. The graphene-wrapped double metal selenide material provided by the present invention has mesoporous properties and a large specific surface area, which not only increases the interaction between sodium ions and the surface, enhances electrical conductivity, but also alleviates the volume expansion of the double metal selenide during charge and discharge. The resulting structural collapse effectively improves the cycle performance of the battery.

The invention discloses a preparation method and application of a sea urchin-shaped vanadium-based nano-electrode material. First, vanadium pentoxide is added into a hydrogen peroxide solution, and a vanadium precursor solution is prepared by electromagnetic stirring in a water bath; and then the vanadium precursor solution, Ethylene glycol and deionized water were added, and ammonium sulfate was added to control the pH of the solution to 2.0~3.0. After mixing the solution with electromagnetic stirring, it was transferred to a hydrothermal reactor for hydrothermal reaction at 160~200 °C for 5~48 h; It is obtained by centrifugation, washing and drying; it is also disclosed that the sea urchin-shaped vanadium-based nano-electrode material is mixed with a binder and a conductive agent in a weight ratio of 70-80:20-10:10, and is coated on the current collector to prepare a electrode pads. The invention uses V2O5 with a lower price as the vanadium source, does not need any surfactant, the preparation process is simple, efficient, stable and economical, and the heat treatment has little influence on the change of the material morphology. Both electrolytes have high specific capacity and long cycle life.

The invention relates to a carbon layer coated nanometer Mn 3 o 4 Core-shell structural materials and their preparation methods and applications. Nano Mn of the present invention 3 o 4 The @C material was synthesized by impregnation and step-by-step calcination using plant cell tissue as a structure-directing agent. The synthesized material retained the biomorphology of the template, oxide nanoparticles and thin layers of biochar were formed during the step-by-step calcination, and the retention of biochar promoted the Mn 3 o 4 Nano-dispersion and grain growth, the obtained material is uniform without obvious agglomeration. During battery charging and discharging, biochar can effectively alleviate the structural collapse caused by lattice shrinkage during lithium ion deintercalation, and provide support and protection for volume changes. During cycling, the carbon layer can limit the aggregation and volume of nanoparticles. Swells, improving battery performance. When this material is used as a negative electrode material for lithium-ion batteries, it is stable at 840 mAhg after 250 cycles ‑1 High specific capacity, cycle coulombic efficiency is stable at 99%.

The invention belongs to the field of flue gas denitration, and particularly relates to a nano-rod shaped chromium-manganese composite oxide low-temperature denitration catalyst and a preparation method thereof. By using potassium permanganate and chromium nitrate as raw materials, the Mn-Cr composite oxide catalyst which has a stable structure, is compounded by manganese oxide and chromium oxideand has a novel rod-shaped structure is prepared through a hydrothermal synthesis method. A preparation process of the catalyst has the advantages that the preparation process is simple and economic,any templates are not needed, the catalyst is easily molded, the transmission electronic and ionic oxygen storage capability of the catalyst is enhanced, an active reaction temperature is effectivelyreduced, the heat stability of the catalyst is greatly improved, the service life of the catalyst is greatly prolonged, the denitration activity and the sulfur resistibility are improved, and an active window is wide.

The invention discloses a positive electrode material with a core-shell structure, a preparation method thereof and an application in a lithium ion battery. The positive electrode material with a core-shell structure includes a carbon coating layer, and an active material core located in the carbon coating layer, and the number of the active material cores is at least two. The positive electrode material of the present invention has a core-shell structure, which can completely cover the material to form a three-dimensional structure, and can alleviate the structural collapse caused by the volume change in the process of material deintercalation of lithium; and at least two spheres composed of active material cores The structure has a certain space to accommodate more electrolyte, which improves the liquid retention capacity, and also has the advantages of high electrical conductivity and high mechanical strength.

The invention provides a preparation method of a graphite negative electrode material for a lithium-ion battery. The method comprises three processes of conductive adhesive preparation, colloidal graphite composite material preparation and porous graphite negative electrode material preparation, wherein an aqueous solvent, a composite conductive agent and a binder are used in the conductive adhesive preparation process; graphite and a conductive adhesive are used in the colloidal graphite composite material preparation process; and a colloidal graphite composite material, an active agent and double-distilled water are used in the porous graphite negative electrode material preparation process. According to the preparation method, a layer of conductive adhesive which is good in conductivity and easy to activate coats the surface of the graphite; activated carbon is activated through activation to generate nanopores which are relatively small in aperture and is decomposed with the binder in the conductive adhesive to leave micro-pores which are relatively large in aperture; and the nanopores generate a synergistic effect in the lithium-ion battery, so that the prepared graphite negative electrode material has the characteristics of high liquid absorption and retention capacity, high compaction density, high conductivity, good cycle performance and the like.

The invention discloses an MXene / conductive polymer composite aerogel. The MXene / conductive polymer composite aerogel is of an integrated three-dimensional grid structure which is formed by insertinglaminated MXene into a conductive polymer aerogel, wherein the conductive polymer comprises one or more of polyaniline, polypyrrole and polythiophene. The invention further discloses a preparation method of the MXene / conductive polymer composite aerogel. The method is characterized in that the MXene and the conductive polymer are mixed with organic solution and then are rapidly cooled and separated under heat inducing and solvent inducing effects under the inert gas protection; then the vacuum drying is carried out to obtain the MXene / conductive polymer composite aerogel.

The invention discloses a three-dimensional metal nanowire and a preparation method thereof. The preparation method includes the following steps: S1, preparing a metal ion solution with a concentration of 0.01-1 mol / L, adding a complexing agent and a nucleating agent, and adjusting the pH value to 10.0-13.5 through an alkali solution to prepare a solution; wherein, the The metal ions are magnetic metal ions or a mixture of magnetic metal ions and non-magnetic metal ions; S2, prepare a strong reductive reducing agent solution of 0.1 to 3 mol / L, adjust the alkali solution to adjust the pH value to 10.0 to 13.5, and prepare B solution ; S3, providing a reaction vessel, placing the activated substrate in the reaction vessel, fully mixing the A solution and the B solution in the reaction vessel, Under the condition of a 1T magnetic field, react for T time to prepare a reaction stock solution containing three-dimensional metal nanowires constructed of magnetic metal nanowires or alloy nanowires. The preparation method of the invention can prepare orderly arranged three-dimensional structure metal nanowires.