电解质
碳酸乙烯酯
材料科学
锂(药物)
电化学
化学工程
插层(化学)
碳纤维
中子散射
相间
介孔材料
电极
散射
无机化学
化学
复合材料
有机化学
催化作用
物理化学
光学
生物
复合数
内分泌学
工程类
物理
医学
遗传学
作者
Craig A. Bridges,Xiao‐Guang Sun,Jinkui Zhao,M. Paranthaman,Sheng Dai
摘要
The aim of this work was to better understand the electrochemical processes occurring during the cycling of a lithium half-cell based on ordered mesoporous hard carbon with time-resolved in situ small-angle neutron scattering (SANS). Utilizing electrolytes containing mixtures of deuterated (2H) and nondeuterated (1H) carbonates, we have addressed the challenging task of monitoring the formation and evolution of the solid–electrolyte interphase (SEI) layer. An evolution occurs in the SEI layer during discharge from a composition dominated by a higher scattering length density (SLD) lithium salt to a lower SLD lithium salt for the ethylene carbonate/dimethyl carbonate (EC/DMC) mixture employed. By comparing half-cells containing different solvent deuteration levels, we show that it is possible to observe both SEI formation and lithium intercalation occurring concurrently at the low voltage region in which lithium intercalates into the hard carbon. These results demonstrate that SANS can be employed to better understand complicated electrochemical processes occurring in rechargeable batteries, in a manner that simultaneously provides information on the composition and microstructure of the electrode.
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