591results about How to "Good thermal stability" patented technology

Spiro-fluorene-9,9-xanthene bipolar luminescent material, its preparation method and its application method

InactiveCN102786508AGood thermal stabilityGood photoelectric performanceOrganic chemistrySolid-state devicesOrganic electroluminescenceLarge applications
Spiro-fluorene-xanthene bipolar main materials have vertical spiral structures, so the main materials can effectively inhibit intermolecular actions, thereby the main materials can inhibit the intermolecular actions and dimer luminescence, and have good thermal stabilities and stable amorphous states. The invention relates to a spiro-fluorene-9,9-xanthene main material having a concrete designed structure shown in the specification, and concretely relates to a preparation method of the spiro-fluorene-9,9-xanthene main material, and an application of the spiro-fluorene-9,9-xanthene main material in organic light-emitting diode devices. The material has the following advantages: 1, the material has a high thermal stability and a stable amorphous state; 2, the material has a steric hindrance effect, so the material can effectively inhibit the dimer luminescence; and 3, the preparation method and the synthetic condition of the material are simple and are easy to implement, and the luminescent efficiency of the material is high. Preliminary research results of the structures of devices of the material and the properties of the material show that the material can be used in red and green light organic electroluminescent devices. Research results show that the material has a large application value and a wide application prospect in organic light-emitting diodes as the main material.

High-strength corundum ceramics and preparation method thereof

The invention discloses a high-strength corundum ceramics and a preparation method thereof. A ceramic blank comprises the following components: 18-22 parts of aluminum oxide, 12-15 parts of quartz, 0.5-1.0 part of talc, 27-30 parts of feldspar, 25-29 parts of kaolin, 10-14 parts of chinastone and 0.5-1.5 parts of blank body plasticizing agent. In sintered porcelain, the aluminum oxide content is higher than 30 percent. The method comprises the following steps: ball-milling and pulverizing a blank; adding water and mixing to obtain blank slurry; deironing and press-filtering the blank slurry into a mud cake and roughly smelting the mud cake; mildewing the roughly smelted mud cake and refining the mildewed mud cake; rolling and moulding the refined mud in a die to obtain a blank body; drying, washing and glazing the blank body and sintering at 1,280-1,320 DEG C for 15-18 hours to obtain a finished product. The product has favorable mechanical strength, and the impact resistant capability of the product is more than four times that of common ceramics; and the product has favorable thermostability, no crack after thermal shock at 200 DEG C/20 DEG C three times, the water absorption rate of lower than 0.1 percent, is more dense, firm and durable and is particularly suitable for an oven, a microwave oven and a dish-washing machine.

Ceramic membrane, preparation method of lithium ion secondary battery and battery

The invention discloses a ceramic membrane. The ceramic membrane is formed by the following steps: synthesizing dendriform grafted copolymers by acrylate monomers and enol monomers in the presence of an initiator, then adding inorganic ceramic particles, uniformly dispersing to form a mixture, and then coating a single surface or two surfaces of a membrane base material with the mixture. The inorganic ceramic particles are adsorbed onto the copolymers and mutually bonded, so as to form compact ceramic coatings with three-dimensional network structures between the inorganic ceramic particles and between the copolymers, and the ceramic coatings are adsorbed together with the membrane base material by virtue of the copolymers, so that the three-dimensional network structure is formed by the inorganic ceramic particles, the copolymers and the membrane base material. The invention further discloses a preparation method of a lithium ion secondary battery and the battery. The ceramic membrane has the advantages of good thermostability, simplicity in process control and easiness in industrial production, in the process of using the lithium ion battery, the stability of the assembly process is kept, the safety performance of the battery is guaranteed, and the effects of environmental friendliness and energy conservation are achieved.

Lithium ion battery positive active substance, anode material, anode material sizing agent, anode piece, preparation method and lithium ion battery

The invention discloses a lithium ion battery positive active substance, an anode material, an anode material sizing agent, an anode piece, a preparation method thereof and a lithium ion battery, which relates to the technical field of lithium ion batteries. The lithium ion battery positive active substance is mainly prepared from the following components by weight percent: 10 to 50 percent of lithium manganese ferrous phosphate and 50 to 90 percent of nickel cobalt lithium manganate, wherein the lithium manganese ferrous phosphate is LiMn*Fe1-*PO4, x is greater than 0.5 and less than 1; and the nickel cobalt lithium manganate is Li(Ni*CoyMnz)O2, x is greater than 0 and less than 1, y is greater than 0 and less than 1, and z is greater than 0 and less than 1. The lithium ion battery positive active substance solves the problems of excessively high temperature and safety of the traditional lithium battery at multiplying power. By improving an anode material and an anode piece, not only can the heat stability of the anode material be improved, but also the internal resistance of the pole piece can be reduced, the application to the high power can be satisfied, and the safety is good.
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