化学
相间
锂(药物)
溶剂
电解质
分解
无定形固体
金属
金属锂
吸附
离子
同步加速器
化学工程
化学物理
无机化学
结晶学
物理化学
有机化学
电极
内分泌学
核物理学
工程类
物理
生物
医学
遗传学
作者
Sha Tan,Dacheng Kuai,Zhiao Yu,Saul Perez-Beltran,Muhammad Mominur Rahman,Ke‐Qing Xia,Nan Wang,Yuelang Chen,Xiao‐Qing Yang,Jie Xiao,Jun Liu,Yi Cui,Zhenan Bao,Perla B. Balbuena,Enyuan Hu
摘要
Lithium metal batteries (LMB) have high energy densities and are crucial for clean energy solutions. The characterization of the lithium metal interphase is fundamentally and practically important but technically challenging. Taking advantage of synchrotron X-ray, which has the unique capability of analyzing crystalline/amorphous phases quantitatively with statistical significance, we study the composition and dynamics of the LMB interphase for a newly developed important LMB electrolyte that is based on fluorinated ether. Pair distribution function analysis revealed the sequential roles of the anion and solvent in interphase formation during cycling. The relative ratio between Li2O and LiF first increases and then decreases during cycling, suggesting suppressed Li2O formation in both initial and long extended cycles. Theoretical studies revealed that in initial cycles, this is due to the energy barriers in many-electron transfer. In long extended cycles, the anion decomposition product Li2O encourages solvent decomposition by facilitating solvent adsorption on Li2O which is followed by concurrent depletion of both. This work highlights the important role of Li2O in transitioning from an anion-derived interphase to a solvent-derived one.
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