8results about How to "Improve doping effect" patented technology

The invention discloses a preparation method of a multi-element doped ferromanganese oxide positive electrode precursor, and belongs to the technical field of lithium ion battery positive electrode material preparation. The molar ratio of manganese to iron in the multi-element doped ferromanganese oxide positive electrode precursor is x: (1-x), 0.2 lt; xlt; and the doping element accounts for 0.1-10% of the total mole number of manganese and iron. According to the multi-element doped ferromanganese oxide positive electrode precursor prepared by the invention, the coprecipitation intermediates are manganese carbonate and ferrous carbonate, and Ksp of the manganese carbonate and the ferrous carbonate are relatively close, so that the uniformity of ferromanganese can be ensured, meanwhile, metal ion doping is carried out in a liquid phase synthesis precursor stage, and the probability that doped ions enter compound lattices is greatly improved. The multi-element doped ferromanganese oxide positive electrode precursor has relatively high stability and good conductivity, and is beneficial to improving the capacity, the cycle life and the compaction density of a lithium iron manganese phosphate positive electrode material.

The invention belongs to the technical field of a new energy material lithium ion battery positive electrode material, and particularly relates to a tungsten-niobium co-doped nickel-rich ternary positive electrode material and a preparation method thereof. According to the preparation method, a precursor subjected to tungsten-niobium mixed pretreatment is calcined to obtain the double-element co-doped nickel-rich ternary positive electrode material. Compared with an undoped sample and a single-element doped sample, the prepared co-doped sample can effectively enhance the structural stability of the material, reduce the polarization of an electrode and improve the diffusion kinetics of lithium ions, so that the cycling stability and the rate capability of the battery are improved at the same time.

The embodiment of the invention provides a TBC battery and a preparation method thereof, in the embodiment of the invention, not only is a tunneling oxide layer added in an N region for passivation contact and phosphorus doping performed, but also a tunneling oxide layer added in a P region for passivation contact and boron diffusion and laser doping treatment are performed, so that the passivation of the P region is increased, the doping effect of the P region is improved, and the service life of the TBC battery is prolonged. Therefore, the photoelectric conversion efficiency of the cell can be improved, and the open-circuit voltage value of the cell is improved.

The invention relates to the field of interior wall putty, and particularly discloses flame-retardant environment-friendly interior wall putty. The adhesive is prepared from the following raw materials in parts by mass: 10 to 20 parts of oxidized starch, 10 to 20 parts of guar gum, 10 to 15 parts of special adhesive powder for putty, 5 to 7 parts of carboxyl-terminated hyperbranched polyester, 1 to 3 parts of chitosan, 3 to 5 parts of graphene oxide, 3 to 5 parts of hydroxypropyl methyl cellulose ether, 3 to 5 parts of starch, 1 to 3 parts of sodium stearate, 1 to 3 parts of sodium hexametaphosphate, 1 to 3 parts of water glass, 1 to 3 parts of borate and 1 to 3 parts of nano antimony trioxide. 1-5 parts of coarse whiting, 1-3 parts of acetic acid aqueous solution with the mass fraction of 8-12%, 1-3 parts of ethanol, 1-3 parts of glycerol and 0.1-0.3 part of preservative. The invention also discloses a preparation method of the flame-retardant environment-friendly interior wall putty. The natural material guar gum is adopted and has a synergistic effect with various materials, so that the stability and flame retardance of a system are effectively enhanced.

The invention provides a metal aerogel catalyst as well as a preparation method and application thereof. The metal aerogel catalyst is prepared from metal aerogel and heteroatoms doped in the metal aerogel; the metal aerogel comprises metal and a carbon material coated on the metal; optionally, the carbon material comprises N; wherein the metal is selected from one or more of Ni, Co, Mn, Cu or Fe; the heteroatom is selected from one or more of N, P, S, B or F. The activity of the catalytic material is improved by utilizing the modification of heteroatoms on the carbon material and the electron transmission property enhanced by the active metal center.

The invention discloses a medical high-purity nano cerium oxide-based suspension as well as a preparation method and application thereof. The mass concentration of the cerium oxide-based particles in the suspension is 1-200mg / L, the chemical general formula of the cerium oxide-based particles is CexM1-xO alpha D delta, M is a cation doped element, D is an anion doped element or group, x is more than 0 and less than or equal to 1.0, alpha is more than 1.0 and less than or equal to 2.0, delta is more than or equal to 0 and less than or equal to 0.2, and the cerium oxide-based particles Ce < 3 + > in the suspension account for 25-55% of the total Ce in percentage by mass; the average primary particle size of the cerium oxide-based particles is 3-50 nm, and the dispersity of the cerium oxide-based particles in the suspension is less than 0.7. The suspension prepared by the method is high in trivalent cerium content, high in oxygen vacancy content and high in biological activity and safety, and the preparation method is low in cost, stable in technical route, free of biological harmful additives and easy for large-scale industrial production.

The application discloses a kind of frame reinforced wave-transparent heat-insulating aerogel materials and preparation method thereof, belong to composite material technical field.The application disperses aluminium oxide nano powder in water, adds adsorbent solution, wave-transparent-light-shielding dual-function auxiliary nano particles, obtains precursor mixed solution after being mixed uniformly;Put ceramic frame into reaction kettle, add precursor mixed solution, make precursor mixed solution fully soak ceramic frame, place reaction kettle in heating environment and carry out reaction to obtain wet gel;Wet gel is taken out, remove wet gel on the surface of ceramic frame, solvent replacement is carried out using organic solvent, and supercritical drying is carried out to obtain aerogel;The aerogel is heat treated to obtain frame reinforced wave-transparent heat-insulating aerogel material.The application introduces wave-transparent-light-shielding dual-function auxiliary and rigid frame structure, and obtains aerogel composite material with good overall formability, high temperature resistance, excellent dielectric properties and excellent mechanical strength.

The application provides a method for preparing lithium manganese iron phosphate from iron hydroxyphosphate, wherein ferrous sulfate is purified to form a ferrous sulfate solution, hydrogen peroxide, phosphoric acid, ammonium dihydrogen phosphate solution, titanium sulfate and ammonia are sequentially added into the solution to form a mixed slurry after reaction, the mixed slurry is heated to a certain temperature and kept for a certain time, and then water washing and pressure filtration are performed to form iron hydroxyphosphate precursors with different iron-phosphorus ratios; the iron hydroxyphosphate precursors are subjected to flash drying and high-temperature sintering and crushing to obtain iron hydroxyphosphate precursors with different iron-phosphorus ratios and different specific surface areas; the iron hydroxyphosphate precursors are crushed and mixed to obtain iron hydroxyphosphate finished products; high-iron-phosphorus-ratio iron hydroxyphosphate and low-iron-phosphorus-ratio iron hydroxyphosphate are mixed according to a certain proportion, and lithium source, manganese source and phosphorus source are proportioned according to a certain proportion, and carbon source and additives are added to form a mixture; and after processes such as ball milling, sand milling, spray drying, sintering, crushing, screening, batching and packaging are performed on the mixture, lithium manganese iron phosphate finished products are obtained.