Towards High Performance Lithium Sulfur Batteries: Surface Oxidation of Micro Porous Carbon for Better Sulfur Positive

摘要

Elemental sulfur has extensive attentions because of its high theoretical specific capacity (1672 mA h g~(-1)), natural abundance and low law-material cost. Therefore, sulfur is a promising candidate for a cathode of next generation batteries. However, there are many issues in fully demonstrating the potential of sulfur-based cathode for Li-S cells: intrinsically insulating of sulfur, large volume change during cycles and dissoluble lithium polysulfide intermediates (Li_2S_n, 4 ≤ n ≤ 8) in an electrolyte. In our previous study, we solved these problems by using micro porous carbon (AC) to accommodate sulfur and demonstrate its stable cycling. Moreover, we proved that oxidation of AC with dilute nitric acid is useful to enhance sulfur-utilization.