(Source: Clarkson University)
Electric cars and other mobile devices can use fast-charging batteries to store large amounts of energy in a small space. According to foreign media reports, the Clarkson University team designed electrodes for such batteries. They use new synthetic technology to produce electrode sheets made of nano-selenium-carbon composite materials. The new positive electrode has the necessary electrical and mechanical properties of rechargeable batteries.
This is a new example of high energy density battery design, using selenium impregnated monolithic carbon as an independent positive electrode for high volume energy lithium and sodium metal batteries. The new electrode brings three major advantages to the battery design. It stores a lot of energy in a small space, the battery is durable, and it charges quickly. These are important factors for mobile battery applications such as electric vehicles.
At present, the scientific literature focuses on the specific energy of batteries (energy per unit weight). However, for automobiles and other mobile applications, energy density (energy per unit volume) is the first factor that should be considered. This study proposes a new battery material design method to solve this key factor that is not fully understood, and fundamentally deviates from the existing advanced technology. Compared with the manufacture of traditional nanostructured porous electrodes with high specific surface area, this work takes the opposite approach to create dense and non-porous monolithic electrode sheets. The sheet is mechanically self-supporting and may not require a positive electrode current collector at all, further reducing the battery volume. In automotive and power grid applications, selenium metal batteries are becoming a high-energy alternative to traditional ion batteries.
Calculated by volume, the energy of the new battery's positive electrode (a dense structure composed of selenium and carbon) is twice that of the porous selenium material. Since the selenium-carbon electrode maintains a nanostructure inside, its charging speed and battery cycleability (the number of times of charging before electrode damage) are excellent. The volume density of the selenium-carbon electrode is relatively high, 2.37g / cc, and the theoretical charge capacity (volume capacity) reaches 1121mah / cc. For lithium (Li) storage, the positive electrode provides a reversible capacity of 1028mah / cc, maintaining 82% of capacity after 300 charge and discharge cycles.
The volumetric energy density of the new electrode is unparalleled. Li-Se is 1,727Wh / L (commercial lithium-ion battery is 770Wh / L), and Na-Se is 980Wh / L. The total combined volume of the two is equivalent. At different charging rates, with the increase of current density, they can maintain more than 60% of capacity, making them ideal for high-power battery systems and automotive fast charging applications.
Simple to replace and install in existing 200mm Aspect Traffic lights.
12-24VDC or 85-265VAC voltage rated.
Highly durable poly-carbonate housing, high-brightness led beads.
Double lens for even light distribution,waterproof material,good effect.
3 Year Replacement Warranty.
200mm Traffic Light Module is a kind of small Traffic Light. It has the characteristics of small size, convenient use, durability and beauty. It is mainly used for children's education, factory buildings, warehouses, purpose of IP65 Waterproof 200mm 12v Traffic Signal Light module
Used for make of the traffic Arrow BoardDecoration for restaurants, hotels, clothing stores, villa areas,Aailiable at the warehouse entrance and so on.etc.
200mm Traffic Light Module
Green Arrow Traffic Light Module,Red Traffic Light Module,Led Traffic Light Module ,2-In-1 Module Traffic Light
Shenzhen Wide Way Optoelectronics Co., Ltd. , https://www.wdmtrafficlight.com