Potential-Resolved In Situ X-ray Absorption Spectroscopy Study of Sn and SnO2 Nanomaterial Anodes for Lithium-Ion Batteries
Potential-Resolved In Situ X-ray Absorption Spectroscopy Study of Sn and SnO2 Nanomaterial Anodes for Lithium-Ion Batteries
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DOI：
10.1021/acs.jpcc.5b12279
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发表时间：
2016-03
影响因子：
3.7
通讯作者：
C. Pelliccione;E. Timofeeva;C. Segre
中科院分区：
文献类型：
--
作者：
C. Pelliccione;E. Timofeeva;C. Segre
这项工作提供了详细的分析过程中发生的金属锡和SnO2阳极材料的锂离子电池在第一锂化，原位研究与快速连续X射线吸收光谱（XAS）。X射线吸收近边结构（XANES）和扩展X射线吸收精细结构（EXAFS）光谱提供了Sn原子环境中动态变化的信息，包括相邻原子的类型和数量以及原子间距离。一种独特的方法被用来模拟锂原子插入到电极材料结构中，并分析电极内SnLi相的形成。此外，在前两个循环中Sn和SnO2电极的完全锂化和脱锂状态的分析提供了对电化学性能差和容量快速下降的原因的深入了解。结果表明，使用SnO2比金属Sn更有前途的阳极材料，但更多的努力，在纳米和原子工程的阳极需要。
This work provides detailed analysis of processes occurring in metallic Sn and SnO2 anode materials for lithium ion batteries during first lithiation, studied in situ with rapid continuous X-ray absorption spectroscopy (XAS). The X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra provide information on dynamic changes in the Sn atomic environment, including type and number of neighboring atoms and interatomic distances. A unique methodology was used to model insertion of Li atoms into the electrode material structure and to analyze the formation of SnLi phases within the electrodes. Additionally, analysis of fully lithiated and delithiated states of Sn and SnO2 electrodes in the first two cycles provides insight into the reasons for poor electrochemical performance and rapid capacity decline. Results indicate that use of SnO2 is more promising than metallic Sn as an anode material, but more effort in nanoscale and atomic engineering of anodes is requi...