The effects of different coating layers on lithium metal anode formed by reacting with different controlled atmospheres (argon, CO2-O2 (2:1), N2, and CO2-O2-N2 (2:1:3)) have been investigated. The obtained XRD, second ion mass spectroscopy (SIMS), and scanning probe microscope (SPM) results demonstrate the formation of coating layers composed of Li2CO3, Li3N, and the mixture of them on lithium tablets, respectively. The Li/Li symmetrical cell and Li/S cell are assembled to prove the advantages of the protected lithium tablet on electrochemical performance. The comparison of SEM and SIMS characterizations before/after cycles clarifies that an SEI-like composition formed on the lithium tablets could modulate the interfacial stabilization between the lithium foil and the ether electrolyte.
Project supported by the National Key Research and Development Program of China (Grant No. 2016YFB0100100), the National Natural Science Foundation of China (Grants Nos. 52315206 and 51502334), and the Fund from Beijing Municipal Science & Technology Commission, China (Grants No. D171100005517001).
Wen-jun Li, Quan Li, Jie Huang, Jia-yue Peng, Geng Chu, Ya-xiang Lu, Jie-yun Zheng, Hong Li. Gas treatment protection of metallic lithium anode[J]. Chin. Phys. B, 2017, 26(8): 088202.