Lithium-sulfur batteries have high theoretical specific capacity and energy density (2600 Wh kg) -1And other advantages have received great attention from academia and industry. However, polysulfide (Li 2Sn, 4 ≤ n ≤ 8) Serious shuttle and poor conductivity of sulfur seriously restrict the practical application of lithium-sulfur batteries. At present, researchers have taken many measures to address the above problems, such as sulfur composite electrodes. Recent studies have shown that The separator has an important influence on battery performance, including inhibition of shuttle, dendrite regeneration, interface stability and safety.
Recently, Zhang Junping, a researcher at the Lanzhou Institute of Chemical Physics of the Chinese Academy of Sciences, first reported a clay mineral super-electrolyte lithium battery separator. Lithofite is rich in O active sites and Li. +It also has a unique lamellar structure and a large specific surface area. Laponite was first applied to lithium-sulfur batteries to suppress polysulfide shuttle and improve the Li+ conductivity of the separator.
Studies have shown that the clay mineral super-electrolyte diaphragm has a significant inhibitory effect on the polysulfide shuttle, while having a high Li + conductivity, fast Li +Transfer, super-electrolyte and high thermal stability. When applied to lithium-sulfur batteries, it is excellent in cycle stability, rate performance and self-discharge inhibition. The study of polysulfide shuttle inhibition mechanism shows that The polysulfide and the C active site of the clay mineral form a Li-S bond and a Li···O bond, so that the shuttle of the polysulfide is effectively suppressed. Compared with the literature, the clay mineral super-electrolyte lithium The battery separator has obvious advantages in lithium-sulfur batteries. In addition, the separator has good universality and can be prepared by a simple coating method in LiFePO. 4And lithium-sulfur batteries have shown excellent performance.
The research was published in Advanced Energy Materials (Adv Energy Mater 2018, 8, 1801778) and was selected as the Cover Cover.
The above work was supported by the Chinese Academy of Sciences 'Hundred Talents Program', the National Natural Science Foundation, and the Gansu Basic Research Innovation Group.
