Researchers at Tsinghua University in China recently discovered a lithium metal electrode material based on graphene nanostructures that can be used to inhibit dendrite growth in lithium-metal batteries and further improve their electrochemical properties.
"The widespread use of lithium-ion batteries has become increasingly difficult to meet the growing demand for energy storage in portable electronics and electric vehicles such as Li-S and Li-air Lithium-ion metal anode cells are also very popular. Lithium-metal batteries provide extremely high theoretical performance, almost 10 times more energy than graphene, "said Zhang Qiang, an associate professor of chemical engineering at Tsinghua University.
However, the practical application of lithium metal is strongly disturbed by the growth of lithium dendrites under continuous cycling, and even leads to safety concerns. Lithium dendrites may cause a short circuit within the cell to cause a fire. In addition, the formation of lithium dendrites Making the cycle less efficient. "
Dendrite growth and instability of the solid electrolyte interface consume large amounts of lithium and electrolyte, resulting in irreversible battery capacity loss.
Schematic diagram of deposition / stripping of lithium on graphene sheets
In order to alleviate the growth of dendrites, several methods have been developed, including adjusting the electrolyte, employing an artificial solid electrolyte interface layer and an electrode structure.
"We found that the growth of lithium dendrites can be effectively suppressed by greatly reducing the local current density, and according to this concept, we use a non-stack graphene material with an extremely high specific surface area to create nanostructured anodes." This is a very effective method, "explains Rui Zhang, Ph.D. candidate in chemical engineering at Tsinghua University and lead author of the study." In addition, we used a double salt electrolyte to achieve a more stable and flexible solid electrolyte interface to avoid lithium The metal reacts further with the electrolyte. "
A number of advances have been made with graphene-based anodes, including the large specific surface area of ​​1666 m2g-1 resulting in an ultra-low local current density of the graphene anode surface (only one ten thousandth of the time with a copper foil anode) Inhibit the growth of dendrites, resulting in uniform lithium deposition patterns.
This anode also provides high stability cycling performance of 4.0 mAh mg-1 due to the high void capacity (1.65 cm2 g-1) of non-stack graphene, which is higher than that of graphene anode (0.372 mAh mg-1) in lithium- 10 times higher.
The anode also exhibits high conductivity (435 S cm-1), resulting in lower interface impedance, stable charge / discharge performance, and high cycle efficiency.
"Conductive nanostructured anodes with a high specific surface area lead to ultra-low local current densities that will help improve the stability and electrochemical performance of lithium metal anodes," said Xin-Bing Cheng, another author of the study. . Relevant research results have been published in the latest issue of "Advanced Materials" (Advanced Materials) journals.
Froth pumps are the latest generation of foam pump/froth pump based on the advanced technology at home and abroad, including foam tank froth Slurry Pump, high pressure slurry pump. It could eliminate the foam/froth in the slurry in running and work normally even if the feeding slurry is not enough. Froth pump is the ideal products to deliver the frothy slurry, especially in the flotation technique process.
Features of Foam/Froth Pumps
1. On the bearing house, there is the motor base or motor support, which helps adopt belt drive or direct drive. It is very convenient to change the pulleys to adjust the speed and meet the changes of the work conditions.
2.The box is made of steel, stainless steel or rubber lined steel. It has the feeding suction and overflow box in the tangent line. The overflow box could deliver the surplus slurry back to the pool. The feeding suction in the tangent line could transport the slurry fast and eliminate part of the froth.
3. Froth pumps are of double-casing. The materials of the wet parts could be metal alloy, rubber or other non-metal material according to the slurry properties.
Application of Froth Pumps
It is used widely in the metallurgy, minerals, coal washery, chemical and other industrial departments, suitable for handing the abrasive and corrosive slurry with the froth.
Slurry Froth Pump,Froth Foam Pump,Centrifugal Froth Pump,Foam Tank Froth Slurry Pump, High Pressure Slurry Pump
Shijiazhuang Boda Industrial Pump Co., Ltd. , https://www.mineralslurrypump.com