Is overprotection of the sulfur cathode good for Li–S batteries?

Abstract

How to restrain the dissolution of polysulfides from the sulfur cathode is the current research focus of Li–S batteries. Here, we find that moderate dissolution of polysulfides is of great importance for high-efficiency and stable discharge/charge cycling. Both overprotection and inadequate protection of the sulfur cathode are unfavorable for the cycling of Li–S batteries.