Lithium-sulfur batteries have received great attention from academia and industry due to their advantages such as high theoretical specific capacity (1675 mA h g-1) and energy density (2600 Wh kg-1). However, problems such as severe shuttle of polysulfide (Li2Sn, 4 ≤ n ≤ 8) and poor sulfur conductivity severely restrict the practical application of lithium-sulfur batteries. At present, researchers have taken many measures to solve the above problems, such as sulfur composite electrodes. Recent studies have shown that separators have an important impact on battery performance, including suppression of shuttles, dendrite regeneration, interface stability, and safety.
Recently, the team of Zhang Junping, a researcher from the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, reported for the first time a clay mineral super-electrolyte lithium battery separator. Laponite is rich in 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 suppress the polysulfide shuttle and improve the Li + conductivity of the separator.
Studies have shown that the clay mineral superphilic electrolyte separator has a significant inhibitory effect on polysulfide shuttle, and has high Li + conductivity, rapid Li + transfer, superphilic electrolyte properties and high thermal stability. When it is applied to lithium-sulfur batteries, it is excellent in terms of cycle stability, rate performance, and self-discharge suppression. The study on the mechanism of polysulfide shuttle inhibition shows that the formation of Li-S bond and Li ··· O bond between polysulfide and O active sites of clay minerals can effectively inhibit the shuttle of polysulfide. Compared with literature reports, the clay mineral super-electrolyte lithium battery separator has obvious advantages in lithium-sulfur batteries. In addition, the separator has good universality, can be prepared by a simple coating method, and shows excellent performance in both LiFePO4 and lithium-sulfur batteries.
The research work was published in "Advance Energy Material" (Adv Energy Mater 2018, 8, 1801778) and was selected as the front cover.
The above work was supported by the "100-person plan" of the Chinese Academy of Sciences, the National Natural Science Foundation of China, and the basic research and innovation group in Gansu Province.
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