42results about How to "Raise the average valence" patented technology

The invention provides a multi-element stable zirconium oxide corrosion-resistant thermal barrier coating material which is prepared by performing mixed ball milling on a main component and stabilizer, wherein the main component is ZrO2; the stabilizer is a mixture of Nb2O5, TiO2 and rare metal oxide; the mol ratio of the Nb2O5 to the TiO2 to the rare metal oxide to the ZrO2 in the multi-element stable zirconium oxide corrosion-resistant thermal barrier coating material is x:1.5x:x:(100-3.5x), and 3<=x<=7; and the rare metal oxide is Lu2O3 or In2O3. The multi-element stable zirconium oxide corrosion-resistant thermal barrier coating material provided by the invention has excellent Na2SO4-V2O5 molten salt corrosion resistance and excellent calcium / magnesium / aluminum silicate molten glass corrosion resistance.

The invention discloses a gradient doped type lithium-ion cathode material and a method for preparing the same, and is used for solving the problem of quick high-temperature circulation attenuation of conventional lithium manganese oxide. The molecular formula of the lithium manganese oxide is LiMn2(3-x) / 3M2x / 3O4, wherein 0<x<=0.5, and M is a doping metal ion and is selected from one or a plurality of magnesium, nickel, iron, titanium, zinc, cobalt, aluminium, niobium and vanadium. The gradient doped type lithium-ion cathode material is a material with the manganese content which is gradually reduced and M content is gradually increased along the radius from the inside to the outside. The method for preparing has short technological process, is easy to control and is easily industrialized. The obtained gradient doped lithium manganese oxide has the characteristics of high specific capacity, good circulation performance, excellent rate capability and the like, and is suitable for the power battery application field.

The invention provides a preparation method of an organic tungsten catalyst used for injection molding of polydicyclopentadiene composite materials, comprising the following steps: S1. feeding nitrogen into the reaction kettle, and then adding a BHT polymerization inhibitor; S2. Pump pentadiene into the reaction kettle, mix well and then pass nitrogen gas; S3 add the catalyst into the reaction kettle and disperse evenly; S4. Heat the reaction kettle; S5. , heating to melt the tungsten-containing compound; S6. Heating the nitrogen gas and controlling its pressure to obtain high-temperature nitrogen gas, so that the tungsten-containing compound becomes a tungsten-containing compound vapor, and feeding the high-temperature nitrogen gas and the tungsten-containing compound vapor into the reaction kettle together, and stirring; S7. Stop the stirring device, cool to below 100°C, blow in nitrogen gas, let stand to cool to room temperature, and discharge. The organic tungsten catalyst prepared by the invention has high catalytic activity, good stability, impurity tolerance and miscibility and dispersibility with cycloolefin substances.

The invention discloses a lithium manganate composite material and a preparation method thereof. The preparation method has the following advantages: 1) a natural lithium-bearing brine resource is comprehensively utilized as a lithium source, the usage amount of a refined lithium salt is reduced, and the material synthesis cost is substantially reduced; 2) the lithium source and a manganate source are uniformly distributed on an atomic level by an ion exchange method, a lattice matrix is easy to rearrange through short-range diffusion, the energy consumption is low during the synthesis process, a relatively low synthesis temperature and relatively short synthesis time are obtained, the grain distribution is uniform, and the polarization is reduced; 3) the constituent contents of lithium and magnesium are reasonably controlled by adjusting a pH value, lithium magnesium-doped type lithium manganate is prepared, the average valence state of manganate during the charge-discharge process is improved, a Jahn-Teller effect is effectively inhibited, and the cycle stability is improved; and 4) from the aspect of economic and environmental protection, the preparation method has more advantages than other schemes, and particularly, the preparation method has practical significance to extract lithium from a liquid-state lithium-bearing brine resource with a high magnesium-lithium ratio to synthesize a composite battery material.