Cerium triflate as superoxide radical scavenger to improve cycle life of LiO2 battery

Cerium triflate (Ce(CF 3 SO 3 ) 3 ) is used as a superoxide radical scavenger in the ether-based liquid electrolyte for the Li O 2 batteries . The radical scavenging capability of Ce 3+ is evaluated both in potassium superoxide + crown solution and the Li O 2 batteries . The chemical analyses further demonstrate cerium ions can effectively slow down the decomposition of electrolyte attacked by superoxide radicals. When the capacity is fixed to 1000 mAh g −1 at a current density of 500 mA g −1 , the Li O 2 battery with 1M LiTFSI-TEGDME electrolyte begins to drop its discharge voltage rapidly to 2.0 V near 40th cycle while the electrolyte with Ce 3+ additives is still above 2.0 V after 88 cycles, demonstrating the cycle life of the Li O 2 batteries show remarkably improved compared to the Li O 2 batteries without any additive into electrolyte.