Changchun Institute of the new cathode material preparation progress

In recent years, nanoporous metal-organic framework compounds (MOFs) have shown promising applications in gas adsorption and separation, heterogeneous catalysis, sensors and microreactors. Chinese Academy of Sciences Changchun Institute of Applied Chemistry, State Key Laboratory of Rare Earth Resources Light Metals and Battery Materials Group, a series of transition metal oxides and their composites were synthesized. These materials have high specific discharge capacity and good cycling stability. MOF template synthesis of lithium ion battery anode materials made a series of research progress.

Researchers found that the coprecipitation technique can effectively adsorb metal cations onto the surface of tellurium nanowires with excellent conductivity. After adding the organic ligand solution, the ligands coordinate with the metal ions on the surface of tellurium nanowires to form MOF nuclei, The nuclei grow into MOF crystals, finally the tellurium nanowires are embedded into the MOF in situ. After heat treatment, a multi-metal oxide nanocomposite with a hierarchical porous structure can be prepared (as shown).

The specific capacity of the nanocomposites stabilized at 956mAhg-1 after charging and discharging for 100 times at the current density of 100mAg-1 in the voltage range of 0.01-3.0V. When the charge-discharge current density was 2000mAg-1, the specific capacity was still as high as 307mAhg -1, showing excellent electrochemical energy storage characteristics.

Relevant studies are published in Adv. Funct. Mater., 2017, 27,; ACS Energy Lett., 2017, 2, 1564-1570; Chem. Eur. J., 2016, 22, 1467-1474; ACS Nano , 2015, 9, 1592-1599; Nanoscale, 2014, 6, 5509-5515 and J. Mater. Chem. A, 2014, 2, 8048-8053 and other academic journals. This series of research projects have been funded by the National Natural Science Foundation of China.

Figure: TeZnCo2O4 preparation process and electrochemical properties

mainly used for earthwork and asphalt applications. New construction and repair work for medium and small scale construction projects, on parking lots, sidewalks, cycle paths, playing fields and sports grounds as well as rolling of joints in road construction.

6~10t large vibratory roller with relatively high pressure and solid capacity should be used for national trunk roads and special roads for automobiles.
For the highway below grade 3, or not often compaction work, it is best to equip with about 2t mobile flexible vibration roller.



2. For the cement concrete pavement, the series vibration roller driven by tire can be used;



3. For asphalt concrete pavement, full-drive vibratory roller should be selected;



4. For the bottom layer of high-grade road subgrade, it is better to choose tire roller or tire driving vibration roller for compaction to obtain uniform compaction;



5. When repairing the road surface, the static action roller can be used.



Iv. Selection of pressed materials according to the type:



1. For rock filling compaction, large tonnage roller should be selected to make large block displacement;



2 for clay compaction, it is best to use convex block ramming roller;



3. For the compaction of the mixture, it is better to choose vibratory roller, so as to mix the size of the particles evenly;



4. Heavy vibratory roller should be used for slow rolling for deep compaction, while static action roller should be used for shallow compaction.

Road Rollers

Road Rollers,Vibrating Road Roller,Mini Road Roller,Drum Road Roller

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