Lithium-sulfur batteries, with the advantages of rich sulfur resources, low production costs, and environmental friendliness, have a high theoretical specific capacity(1675 mAh·g^-1). However, polysulfide shuttle causes serious problems such as the passivation of metal lithium anode, the decrease of battery capacity and coulomb efficiency, and hinders its practical applications. It is considered to be an extremely effective strategy to introduce a barrier layer to restrain polysulfide shuttle between the cathode and anode, which presents excellent performance in alleviating polysulfide shuttle, improving the utilization efficiency of active materials and extending cycle life and cycle stability. Herein, the research progress of the functional lithium sulfur battery separators is reviewed. Furthermore, the future research trend is also predicted.
Contents
1 Introduction
2 The principle and configuration of lithium-sulfur batteries
3 Technical challenges of research and application
4 Research development of functional separator
4.1 Functional separator with adsorption
4.2 Functional separator with catalytic function
4.3 Functional separator with electrostatic repulsion
4.4 Functional separator with physical barrier
4.5 Novel multifunctional separator fabrication
4.6 Functional separator for protecting Li metal anode, synergistically
5 Conclusion and outlook