77results about How to "Improve high temperature thermal stability" patented technology

The invention relates to a high-temperature liquid-state nitrate purification and performance enhancement fusing tank. A filtering plate (4) is horizontally arranged inside a tank body (2), a hollow stirring rod (16) is arranged in the middle of the top of the tank body (2) towards the tank body (2), the lower end of the hollow stirring rod (16) is positioned on the upper side of the filtering plate (4), a stirring paddle (3) is arranged on the lower end of the hollow stirring rod (16), the lower end of the hollow stirring rod (16) is connected with a bubbler (5) which downwards penetrates through the filtering plate (4). Dry air, carbon dioxide and nitrogen gas are sequentially fed, the stirring paddle (3) is used for stirring while the bubbler (5) conducts gas introduction, and through the coordinated and reasonable structure arrangement of the stirring paddle and the bubbler and by bubbling, stirring, filtering, additive addition and the like under the high-temperature melting state, the purification function of high nitrate can be realized, the impurity removal and purification rate of the fused salt is up to 97%, the high-temperature thermal stability of nitrate can be enhanced, and the corrosivity of nitrate can be reduced. The stirring and homogenization time is short, and the high-temperature liquid-state nitrate purification and performance enhancement fusing tank is energy-saving, environment-friendly, safe and high in efficiency.

The invention discloses a composite diaphragm for a lithium ion battery and a preparation method thereof, including a ceramic coating modification method and a ceramic lithium battery diaphragm. The ceramic protective layer is mainly a mixture of ceramics and binders which are grafted and modified by anionic surfactants containing sodium sulfonate or sodium carboxylate groups. Grafting is completed under the action of dehydrating agent and using the "grafting to" method. The grafting rate of ceramics is relatively high. The modified ceramic diaphragm introduces high-temperature-resistant high-specific-surface-area nano-ceramics on the surface of conventional PP diaphragms, which greatly improves the It improves the insulation of the diaphragm and the wettability of the electrolyte, especially at high temperatures of 130°C, 150°C and 180°C, it exhibits excellent high-temperature thermal stability. The lithium battery composite diaphragm avoids the heat shrinkage of conventional diaphragms, thereby avoiding thermal runaway inside the battery caused by heat shrinkage, thereby improving the safety and reliability of the lithium ion battery.

The invention relates to an SiC fiber or fabric and a preparation method thereof and belongs to the technical field of composite materials. By taking natural vegetable fiber or the fabric thereof as the template, the SiC fiber or fabric is obtained through impregnation in silica sol and high-temperature calcination. The preparation method includes the following steps: impregnating silica sol in natural vegetable fiber or fabric thereof carbonized or pretreated by organic expanding agent by adopting a vacuum or vacuum pressure way or the vacuum or vacuum pressure way simultaneously combined with a concentration gradient diffusion way to achieve 75-166 percent of weight gain rate, and then under protective gas, calcining the obtained material at the temperature of 1400-1600 DEG C for 1.5-4h, and converting the obtained material into complete SiC fiber or fabric. The SiC fiber or fabric not only completely maintains the structure of natural vegetable fiber, but also is characterized by high strength, high-temperature thermostability and resistance to acid and alkali corrosion of SiC material. Meanwhile, the SiC fiber or fabric is also characterized by vertical and horizontal performance uniformity of fabrics and very suitably used as the enhanced phase of in-plane equidirectional composite material of high performance.