Organic materials are rich in chemical composition, adjustable redox potential, can achieve multiple electron transfer, and rich source of raw materials, low cost, materials can be recycled degradation, harmless to the environment, as a sodium ion battery electrode material has attracted widespread attention . Recently, Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics (CPC) Clean Energy Laboratory E01, Ph.D. student Wu Xiaoyan, and researcher Hu Yongsheng have discovered a new type of organic negative electrode material for sodium ion batteries - 2,5-benzoquinone. -1,4 disodium (Na2C6H2O4) (Chinese invention patent, application number), and studied the electrochemical properties and sodium storage mechanism. The average inlaid sodium potential of this material is 1.4V and the first week reversible capacity is 265mAh/g. Due to the higher voltage (>1.0V), the SEI film formed on the surface during charge and discharge is very low, and the first week of Coulomb efficiency (92%) is obtained.
However, the conductivity of organic materials is generally low. Using the characteristics that the material is soluble in water, they have developed a spray drying method to prepare and construct a Na2C6H2O4/CNT composite material with an ion-electron mixed conductive network structure in one step. With good cycling and rate performance, the reversible capacity reached 136 mAh/g at 7C rate, and the capacity remained at 195 mAh/g after 30 cycles at 1C rate. At the same time, this method can be extended to water-soluble or oil-soluble materials with low electrical conductivity, realize effective compounding with hydrophilic or lipophilic carbon nanotubes, and realize low-cost, one-step implementation of composite electrode materials with high electrical conductivity ( Journal of Materials Chemistry A, 2015, 3, 13193-13197).
Further collaborating with AO2 researcher Jin Shifeng and researcher Chen Xiaolong, the crystal structures of Na2C6H2O4 and its sodium-incorporated Na3C6H2O4 and Na4C6H2O4 were solved. It was found that their structure was formed by the interlacing of parallel organic benzene rings and inorganic Na-O layers. Organic-inorganic layered structure. In situ XRD results showed that the structural changes in charge and discharge during the first two weeks were: Na2→Na4 two-phase reaction occurred in the first week of discharge, and Na2→Na3 and Na3→Na2 two-phase reaction occurred in the first week of charge. The mesophase Na3 phase appears during the second week of discharge and charging. With the insertion of Na, the coordination between Na atom and carbonyl group changes. The Na-O layer of Na3 phase is distorted to a certain degree compared with Na2 phase and Na4 phase, and the clamp between benzene ring and bc plane. As the angle decreases, the entire molecule rotates. Based on the first-principles calculation, Zhang Zhizhen, a Ph.D. student in the E01 group, studied the electronic structures and sodium transport mechanisms of Na2C6H2O4 materials and their sodium-incorporated Na3C6H2O4 and Na4C6H2O4. It was found that electrons are transferred and stored in the organic benzene ring layer, and the benzene ring is a redox center; while sodium ions diffuse and store in the inorganic Na-O layer, this new mechanism is similar to the transition metal layered oxide material. This provides theoretical guidance for the design of new types of organic materials. The relevant research results have been highly recognized by international peers and have recently been published in the Science Advances 2015, 1, e1500330.
The above work has been supported by the National Natural Science Foundation of China's Outstanding Youth Fund, the "863" Innovation Team Project of the Ministry of Science and Technology, the Innovation Group of the Committee, and the 100-person plan of the Chinese Academy of Sciences.
| For products reference | ||
| No. | Item | Description |
| 1 | Bearing Bar Size | 25x3, 25x4, 25x4.5, 25x5, 30x3, 30x4, 30x4.5, 30x5, 32x5, 40x5, 50x5, 65x5, 75x6, 75x10---100x10mm etc. |
| I bar: 25x5x3, 30x5x3, 32x5x3, 40x5x3 etcUS standard: 1''x3/16'', 1 1/4''x3/16'', 1 1/2''x3/16'', 1''x1/4'', 1 1/4''x1/4'', 1 1/2''x1/4'', 1''x1/8'', 1 1/4''x1/8'', 1 1/2''x1/8'' etc. | ||
| 2 | Bearing Bar Pitch | 12.5, 15, 20, 23.85, 25, 30, 30.16, 31, 32.5, 34.3, 35, 38.1, 40, 41.25, 60, 80mm etc. |
| US standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc. | ||
| 3 | Cross Bar Size and Pitch | Twisted bars 5x5, 6x6, 8x8mm; Round bars Dia.6, 7, 8, 9, 10, 12mm and so on. |
| 38.1, 40, 50, 60, 76, 80, 100, 101.6, 120, 135mm, 2'' & 4'' etc. | ||
| 4 | Material Grade | ASTM A36, A1011, A569, Q235, S275JR, SS400, Mild steel & Low carbon steel, etc. |
| Stainless steel SS304, SS316.s335jr | ||
| 5 | Surface Treatment | Black, self colour, hot dip galvanized, painted, powder coating, electrolytic polishing. |
| 6 | Grating Style | Plain / Smooth, Serrated /teeth, I bar, serrated I bar. |
| 7 | Standard | China: YB/T 4001.1-2007, USA: ANSI/NAAMM(MBG531-88),UK: BS4592-1987, Australia: AS1657-1985,Germany: DIN24537-1-2006, Japan: JIS. |
| 8 | Panel Size: | 3x20ft,3x24ft,3x30ft,5800x1000, 6000x1000, 6096x1000,6400x1000, as request |
| 9 | Application: | oil refinery,petroleum and chemical Industry, Seaport and airport, power plant, transportation, papermaking, medicine, steel and iron, food, municipality, real estate, manufacturing,metallurgy,railway,boiler,etc |
Steel Grating,Steel Bar Grating,Galvanized Steel Bar Grating,Steel Bar Grating For Bridge
HEBEI KAYI BUILDING MATERIAL TECHNOLOGY CO.,LTD , https://www.kayigrating.com