Super electrolyte lithium battery separator -Lithium - Ion Battery Equipment

Laponite is used in lithium-sulfur batteries for the first time. Lanzhou Chemical develops super-electrolyte lithium battery separators. -Lithium - Ion Battery Equipment

Lithium-sulfur batteries have received great attention from academia and industry due to their high theoretical specific capacity (1675mAhg-1) and energy density (2600Whkg-1). However, problems such as severe polysulfide (Li2Sn, 4≤n≤8) shuttle and poor sulfur conductivity 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 separators have an important impact on battery performance, including shuttling inhibition, dendrite regeneration, interface stability and safety.

Recently, Zhang Junping's team, a researcher at the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, reported for the first time a clay mineral super-electrolyte lithium battery separator. Laponite contains abundant O active sites and Li+, and also has a unique lamellar structure and a large specific surface. Laponite was first used in lithium-sulfur batteries to inhibit polysulfide shuttle and improve the Li+ conductivity of the separator.(Lithium - Ion Battery Equipment)

Research shows that the clay mineral superelectrolyte separator has a significant inhibitory effect on polysulfide shuttle, and at the same time has high Li+ conductivity, rapid Li+ transfer, superelectrolyte and high thermal stability. When applied to lithium-sulfur batteries, it performs excellently in terms of cycle stability, rate performance and self-discharge suppression. Research on the mechanism of polysulfide shuttle inhibition shows that the shuttle of polysulfide is effectively inhibited through the formation of Li-S bonds and Li˙˙˙O bonds between polysulfides and the O active sites of clay minerals. Compared with literature reports, clay mineral superelectrolyte lithium battery separators have obvious advantages in lithium-sulfur batteries. In addition, the separator has good universality and can be prepared by a simple coating method, showing excellent performance in both LiFePO4 and lithium-sulfur batteries.

This research work was published in Advanced Energy Materials (AdvEnergyMater2018,8,1801778) and was selected as the cover article (FrontCover).

The above work is supported by the Chinese Academy of Sciences, the National Natural Science Foundation of China, and the Gansu Provincial Basic Research Innovation Group.



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