Merso, Semaw KebedeSemaw KebedeMersoTekaligne, Teshager MekonnenTeshager MekonnenTekaligneWeldeyohannes, Haile HishoHaile HishoWeldeyohannesNikodimos, YosefYosefNikodimosShitaw, Kassie NigusKassie NigusShitawJiang, Shi KaiShi KaiJiangHuang, Chen JuiChen JuiHuangWondimkun, Zewdu TadesseZewdu TadesseWondimkunJote, Bikila AlemuBikila AlemuJoteWichmann, LennartLennartWichmannBrunklaus, GuntherGuntherBrunklausWinter, MartinMartinWinterWu, She HuangShe HuangWuSu, Wei NienWei NienSuCHUNG-YUAN MOUHwang, Bing JoeBing JoeHwang2022-12-282022-12-282022-12-102352152Xhttps://scholars.lib.ntu.edu.tw/handle/123456789/626786Anode-free lithium metal batteries (AFLMBs) can achieve a high energy density. However, achieving high-capacity retention and Coulombic efficiency (CE) are challenging without a continuous Li supply from the Cu anode side. The lower CE and rapid capacity decay in AFLMBs are primarily due to non-uniform Li deposition and electrolyte decomposition during cycling. Herein, strontium fluoride (SrF2) nanoparticles are applied on Cu foils to attain the in-situ forming of a bifunctional interfacial layer, a Li-Sr alloy, and a LiF-rich SEI composite layer during Li plating. The derived Cu@SrF2 electrode has excellent plating/stripping stability and outstanding performance. AFLMB full cell (Cu@SrF2//NCM111) attains an average Coulombic efficiency (ACE) of 98.6 % and capacity retention of 51.0 % at the 60th cycle using a commercial carbonate-based electrolyte. In contrast, the bare AFLMB full cell (BCu//NCM111) only has an ACE of 94.9 % with a capacity retention of 10.2 % under the same conditions. The concept is proven in lithium metal batteries (LMBs). This strategy provides a simultaneous Li nucleation and formation of LiF-rich SEI layers, rendering it promising to realize AFLMBs and LMBs with long lifespans and high CE.enAnode-free | Bifunctional material | Li nucleation | Li-Sr alloy | SrF particles 2[SDGs]SDG7journal article10.1016/j.est.2022.1059552-s2.0-85141546699https://api.elsevier.com/content/abstract/scopus_id/85141546699