36results about How to "High charge transfer capability" patented technology

The invention provides a lithium iron phosphate / lithium vanadium phosphate / carbon composite positive electrode material and a preparation method thereof, the molecular formula of which is (1-x)LiFePO 4 ·xLiVPO 4 F / C, where x=5-40wt%, and the mass fraction of C in the composite cathode material is 0.5-2.0wt%. The present invention first synthesizes lithium iron phosphate, and then synthesizes VPO 4 Intermediate, finally lithium iron phosphate, VPO 4 The intermediate is mixed with other raw materials for the synthesis of lithium vanadium phosphate, and then pressed and sintered to ensure that there is no heterophase formation of lithium vanadium phosphate in the composite material, and a composite structure with a dual-phase lithium intercalation active material is formed in the composite material to stabilize phosphoric acid The surface properties of iron-lithium materials can improve the surface / interface diffusion capacity of lithium ions and the transport rate of electrons, and improve their rate performance and cycle performance without sacrificing energy density.

The invention relates to a ZnO photocatalytic material modified with porous carbon and a preparing method thereof. The ZnO photocatalytic material modified with porous carbon includes zinc oxide nanometer particles and amorphous porous nanometer carbon. The zinc oxide nanometer particles are covered with the amorphous porous nanometer carbon largely or the amorphous porous nanometer carbon is doped in gaps among the zinc oxide nanometer particles largely. The method has characteristics of a simple preparing process, mild reaction conditions, easy control, and the like. The material has a high specific surface area, high CO2 adsorptivity, visible-light response and charge transfer capabilities, effectively overcomes disadvantages which are a small specific surface area, a high photo-induced electron hole pair recombination rate and a low photocatalytic efficiency of a single zinc oxide photocatalyst, greatly increases the solar energy utilization efficiency, and has a wide application prospect in the fields of photocatalysis, electrochemistry, energy, environment, and the like.

The invention relates to a preparation method for a hypercrosslinked layered microporous polymer. The preparation method comprises the following steps: firstly, preparing flaky molybdenum disulfide with sodium molybdate and thiourea respectively as a molybdenum source and a sulfur source, then allowing diazonium salt to grow on the flaky molybdenum disulfide through a direct grafting method, and carrying out diazonium salt functionalization so as to form a MoS2-PANI conductive polymer; furtherly, adding a copolymer of organic matter polyvinyl alcohol, vinyl benzyl chloride and divinyl benzene under the action of an azodiisobutyronitrile polymeric initiator so as to obtain a hypercrosslinked longer-chain conductive polymer; and finally, controlling reaction temperature and time, and carrying out Friedel-Crafts reaction under the catalytic action of FeCl3 so as to obtain the layered hypercrosslinked microporous polymer conductive material MoHCPs. Compared with the prior art, the preparation method provided by the invention has the characteristics of simple preparation process and required equipment, significantly decreased reaction temperature, easily available raw materials, easiness in implementation of large-scale production, etc.

The invention discloses a polypyrrole and metal nano-particle composite gas sensor and a production method thereof. The gas sensor adopts a ceramic matrix with interdigital gold electrode pairs; the surfaces of the ceramic matrix and the gold electrodes are covered with polypyrrole and palladium nano-particle composite gas-sensing films. The invention has simple production technique and low cost,which is particularly suitable for mass production. The prepared element has the advantages of high sensitivity, fast response, good recovery, strong stability, good selectivity and room temperature detection in ammonia detection, and can be widely used for accurate detection and control of ammonia gas in atmospheric environmental monitoring in the industrial and agricultural production processes.

The invention provides a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. The lithium ion battery electrolyte comprises a non-water organic solvent and lithium salt, wherein the non-water organic solvent comprises propylene carbonate. The lithium ion battery electrolyte also comprises an additive having a general formula shown in the description. In the formula, n is in a range of 1-5, R1 is C1-C5 alkane, and R2 is C1-C5 alkane. Based on the total weight of the organic solvent, the content of propylene carbonate is 10-50 wt%, and based on the total weight of the electrolyte, the content of the additive is 0.1-5 wt%. The provided electrolyte enables high and low temperature performance of the battery to be obviously improved, and the operating temperature range of the lithium ion battery electrolyte is broadened. Any one of natural graphite, artificial graphite, and mixed graphite can be selected as a negative electrode of the battery.