Researchers from South China Normal University and Suzhou University report a new dual-functional Li-S battery separator (CC-rGO/AB/PP) obtained by a new synthesis method under extreme pressure (1 Pa, -50 C) to cure lithium . competence. -S batteries in a simple way.
Increasing energy storage demand, especially for electric vehicles and power plants, requires batteries with higher energy. Lithium sulfur (Li-S) batteries theoretically have a much larger energy capacity than Li-ion batteries, so they have received a lot of attention.
However, the actual lifetime and conversion efficiency are significantly reduced due to the shuttle effect, where lithium polysulfides (LiPS) dissolve and penetrate the anode during discharge, causing an internal short circuit. While there are ways to suppress the shuttle effect with the separator, many still have to sacrifice other performance metrics such as lithium-ion carrying capacity.
Publishing in a journal International Journal of Extreme Manufacturingprof. A team led by Weishan Li and Yuyong Li produced and investigated a graphene oxide/acetylene carbon black/polypropylene (CC-rGO/AB/PP)-reduced N,O-carboxymethyl chitosan laminar separator.
Reduced graphene oxide (rGO) is a popular material used to improve the performance of lithium-sulfur (Li-S) batteries, but the traditional synthesis method often involves high temperatures and complex chemical processes. Moreover, the folded and compact multilayer structure of rGO is not advantageous for the transport of lithium ions due to its small surface area.
Studies show that rGO can be prepared by reduction induced by reducing groups and separated into monolayers by adding macromolecules. It is worth noting that the reaction favors the automatic assembly of external “chemical parts” on the surface of the material, also known as self-assembly. Meanwhile, heteroatoms in materials are crucial for improving battery performance because they can form active sites that perform dual functions, namely repel LiPS and transfer Li. +.
Source: Port Altele
