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The main component of lithium-sulfur batteries is sulfur, which is abundant, light, cheap and environmentally friendly

wallpapers Tech 2021-04-28
The main component of lithium-sulfur batteries is sulfur, which is abundant, light, cheap and environmentally friendly
For new energy vehicles, the biggest bottleneck is lithium batteries, and many scientists are also actively looking for solutions. According to media reports, Cheong Ying Chan, a professor in the Department of Engineering and Environment at the Hong Kong University of Science and Technology (HKUST), and Zhao Tianshou, a professor in the Department of Mechanical and Aeronautical Engineering and Director of the Energy Research Institute at the Hong Kong University of Science and Technology (HKUST), have formed a research team. A new cathode design concept is proposed for Li-S batteries, which will greatly improve the performance of Li-S batteries.
Lithium-ion batteries are known to be found in almost every corner of our lives, from phones to computers to cars, and are being touted as an alternative.
Compared with lithium-ion batteries, lithium-sulfur batteries have a higher energy density, the energy density can exceed 500Wh/kg, which is 66% higher than the limit energy density of 300Wh/kg.
 
Higher energy density means that an electric car powered by a lithium-ion battery with a range of up to 400km could have an extended range of 600-800km when powered by a lithium-sulphur battery.
At the same time, the main component of lithium-sulfur batteries is sulfur, which is abundant, light, cheap and environmentally friendly.
Although the surface data is considerable, there is still a big gap between the experimental research data and the commercialization of the technology. One of the biggest problems is that the polysulfide shuttle effect of lithium-sulfur batteries will lead to lithium corrosion and leakage of the battery cathode material, thus shortening the battery service life.
 
Another challenge is the need to reduce the total amount of electrolytes in the battery while maintaining stable performance.
To solve these problems, the team proposed a novel cathode design concept that can achieve good performance of lithium-sulfur batteries.
The sulfur is evenly embedded in a highly oriented pore, which is rich in active sites to tightly bind the polysulfide, eliminating the shuttle effect and corrosion effects of lithium metal. By coming up with new sulfur cathode design principles for lithium-sulfur batteries, the joint team has improved the energy density of the batteries and made a big step towards the industrialization of the batteries.
"We are still carrying out basic research in the field, but our new cathode design concepts and breakthroughs in battery performance represent a big step forward in the practical application of next-generation batteries that are more powerful and long-lasting than existing lithium-ion batteries," Prof Zhao said.

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