Researchers at CAS Lanzhou Institute of Chemical Physics use clay separator for lithium-sulfur batteries

Lithium-sulfur batteries have a high specific capacity (1675 mA h g-1) and energy density (2600 Wh kg-1). However, the poor conductivity of the Li polysulfides (Li2Sn, 4 ≤ n ≤ 8) formed seriously restricts practical applications. ZHANG Junping’s group has now reported laponite as a clay mineral super-electrolyte lithium battery separator. It has a unique lamellar structure and a large specific surface. In lithium-sulfur batteries, laponite inhibits a polysulfide shuttle and increases Li+ conductivity and Li+ transfer. The resulting battery is excellent in cycle stability, performance, and inhibition of self-discharge. The formation of polysulfides is effectively inhibited by forming a Li-S bond and a Li···O bond between the polysulfide and the O active site of the clay mineral. The clay separator can be prepared by a simple coating method and exhibits excellent performance in both LiFePO4 and lithium sulfur batteries.

CAS news release, September 10, 2018

Researchers at CAS Lanzhou Institute of Chemical Physics use clay separator for lithium-sulfur batteries
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