Additionally, this technology can separate and precisely power the red, green, and blue LED chips. The voltage drop and current loss can be reduced by using the independent voltages power supply method. It is an energy-saving power supply technology for LED displays where the current first passes through the LED chips and then reaches the negative pole of the driving IC, hence the name “common cathode”. It has all of the cathodes of the individual LEDs connected together and to a common terminal, while the anodes of each LED are connected separately.Ĭommon cathode”.
This recovery process is efficient and inexpensive, reduces safety risks, avoids waste, and opens new prospects for the sustainable recycling of lithium-ion batteries.A common cathode LED screen is also called” energy-saving led display”. The PAH/solvent system can be varied to optimize it for the material being treated. With the PAH pyrene in tetraethylene glycol dimethyl ether, it was possible to dissolve the active lithium from the anodes almost completely.Īn additional advantage is that the resulting lithium-PAH solutions can be used directly as reagents, for example, in adding lithium to new anodes in preprocessing or in regenerating spent cathodes. Under mild conditions, this redox reaction is controlled and very efficient. Certain PAHs can take up a positively charged lithium ion from the graphite anode together with one electron. The solutions consist of a polycyclic aromatic hydrocarbon (PAH) and an ether as the solvent. Aprotic substances cannot release any hydrogen ions, so no hydrogen gas can form. Instead of water, they use aprotic organic solutions to recover lithium from anodes. You may unsubscribe at any time.Ī team led by Yu-Guo Guo and Qinghai Meng at the Institute of Chemistry of the Chinese Academy of Sciences (ICCAS) and the University of Chinese Academy of Sciences (UCAS) has now developed an alternative method that avoids these problems. These reactions release large amounts of energy and may produce hydrogen.īy subscribing, you agree to receive email related to Lab Manager content and products. Because of their high reactivity, however, the risk of fires and explosions is high if the anodes are leached out with aqueous solutions, as is usual. Extraction from the anodes, which consist primarily of graphite, is significantly more efficient and can be carried out without discharging the battery beforehand. However, it then precipitates out together with other metals contained in the cathode and must be painstakingly separated. Most recycling processes are targeted at extracting the lithium from cathodes (where most of the lithium in discharged batteries is located). The recovery of lithium of a quality high enough to be used again is complicated and expensive.
The recycling of LIBs is a difficult undertaking. In the journal Angewandte Chemie, researchers introduce a novel approach for the recovery of lithium from used LIBs. As the share of volatile renewable energy needing electricity storage increases, more and more LIBs are needed, lithium prices rise, resources dwindle, and the amount of depleted batteries that contain toxic substances increases.
#Anode or cathode led portable#
Lithium-ion batteries (LIBs) provide our portable devices like tablets and mobiles-and increasingly also vehicles-with power.
0 kommentar(er)
