"Chemical routes toward long-lasting lithium/sulfur cells" by Meinan Liu, Fangmin Ye et al.

Article Title

Chemical routes toward long-lasting lithium/sulfur cells

Authors

Meinan Liu, i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Fangmin Ye, i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Wanfei Li, i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Hongfei Li, Department of Physics, Tsinghua University, Beijing 100084, China
Yuegang Zhang, i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China Department of Physics, Tsinghua University, Beijing 100084, China

Keywords

lithium/sulfur battery, chemical bonding, functional group, additive, lithium polysulfide

Abstract

Lithium/sulfur (Li/S) cells have great potential to become mainstream secondary batteries due to their ultra-high theoretical specific energy. The major challenge for Li/S cells is the unstable cycling performance caused by the sulfur’s insulating nature and the high-solubility of the intermediate polysulfide products. Several years of efforts to develop various fancy carbon nanostructures, trying to physically encapsulate the polysulfides, did not yet push the cell’s cycle life long enough to compete with current Li ion cells. The focus of this review is on the recent progress in chemical bonding strategy for trapping polysulfides through employing functional groups and additives in carbon matrix. Research results on understanding the working mechanism of chemical interaction between polysulfides and functional groups (e.g. O–, B–, N– and S–) in carbon matrix, metal-based additives, or polymer additives during charge/discharge are discussed.