The Salt Matters: Enhanced Reversibility of Li–O2 Batteries with a Li[(CF3SO2)(n‐C4F9SO2)N]‐Based Electrolyte |
| |
| Authors: | Bo Tong Jun Huang Zhibin Zhou Zhangquan Peng |
| |
| Affiliation: | 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, China;2. Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, China;3. College of Chemistry and Chemical Engineering, Central South University, Changsha, China |
| |
| Abstract: | The safety hazards and cycle instability of lithium metal anodes (LMA) constitute significant barriers to progress in lithium metal batteries. This situation is worse in Li–O2 batteries because the LMA is prone to be chemically attacked by O2 shuttled from the cathode. Notwithstanding, efforts on LMA are much sparse than those on the cathode in the realm of Li–O2 batteries. Here, a novel lithium salt of Li(CF3SO2)(n‐C4F9SO2)N] (LiTNFSI) is reported, which can effectively suppress the parasitic side reactions and dendrite growth of LMA during cycling and thereby significantly enhance the overall reversibility of Li–O2 batteries. A variety of advanced research tools are employed to scrutinize the working principles of the LiTNFSI salt. It is revealed that a stable, uniform, and O2‐resistive solid electrolyte interphase is formed on LMA, and hence the “cross‐talk” between the LMA and O2 shuttled from the cathode is remarkably inhibited in LiTNFSI‐based Li–O2 batteries. |
| |
| Keywords: | electrolyte engineering Li– O2 battery lithium metal anode reversibility solid electrolyte interphase |
|
|
