氟化锂
纳米晶材料
电解质
材料科学
锂(药物)
对分布函数
阳极
金属
同步加速器
相间
离子键合
衍射
结构精修
电极
纳米技术
分析化学(期刊)
无机化学
化学
结晶学
晶体结构
离子
物理化学
冶金
物理
内分泌学
有机化学
光学
生物
医学
量子力学
遗传学
色谱法
作者
Zulipiya Shadike,Hongkyung Lee,Oleg Borodin,Xia Cao,Xiulin Fan,Xuelong Wang,Ruoqian Lin,Seong‐Min Bak,Sanjit Ghose,Kang Xu,Chunsheng Wang,Jun Liu,Jie Xiao,Xiao‐Qing Yang,Enyuan Hu
标识
DOI:10.1038/s41565-020-00845-5
摘要
A comprehensive understanding of the solid–electrolyte interphase (SEI) composition is crucial to developing high-energy batteries based on lithium metal anodes. A particularly contentious issue concerns the presence of LiH in the SEI. Here we report on the use of synchrotron-based X-ray diffraction and pair distribution function analysis to identify and differentiate two elusive components, LiH and LiF, in the SEI of lithium metal anodes. LiH is identified as a component of the SEI in high abundance, and the possibility of its misidentification as LiF in the literature is discussed. LiF in the SEI is found to have different structural features from LiF in the bulk phase, including a larger lattice parameter and a smaller grain size (<3 nm). These characteristics favour Li+ transport and explain why an ionic insulator, like LiF, has been found to be a favoured component for the SEI. Finally, pair distribution function analysis reveals key amorphous components in the SEI. X-ray diffraction and Rietveld refinement analysis confirm the presence of LiH in the solid–electrolyte interphase of lithium metal anodes.
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