Guoran Li

Abstract:

Lithium-sulfur rechargeable battery using metallic lithium as anode has a theoretical energy density of 2600 Wh Kg¨C1. This means that lithium-sulfur battery will be one of the promising next generation batteries for mobile devices like cell phones and electrical vehicles. However, the highly reactive metallic lithium in lithium-sulfur batteries can easily induce a series of problems, such as unstable lithium/electrolyte interface, uneven deposition/dissolution of lithium, and massive surface defects. As a result, lithium-sulfur batteries can be thoroughly destroyed after some charge-discharge cycles due to powderization of metallic lithium anode. Here we introduce our works on protection of metallic lithium anode, including the application of the protective layer, optimization of battery fabrication, alloying of anode, and the introduction of electrolyte additives. These efforts can effectively restrain the reactive activity of lithium anode, and improve stabilization of lithium anode in the cycling of lithium sulfur rechargeable batteries. It is very significant for developing long cycling lithium sulfur rechargeable batteries.