Morphological Studies of Li Deposition Processes in LiAsF6 / PC Solutions by In Situ Atomic Force Microscopy
Morphological Studies of Li Deposition Processes in LiAsF6 / PC Solutions by In Situ Atomic Force Microscopy
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DOI：
10.1149/1.1838018
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发表时间：
1997-10
影响因子：
3.9
通讯作者：
D. Aurbach;Y. Cohen
中科院分区：
文献类型：
--
作者：
D. Aurbach;Y. Cohen
利用原子力显微镜（AFM）原位研究了Li在碳酸丙烯酯/LiAsF{sub 6}溶液中沉积-溶解过程的形貌。测试了干燥（20至30 ppm水）、水污染（200 ppm H{sub 2}O）和CO{sub 2}饱和溶液。基板包括铜箔，其目前用作Li电极和金属锂的集电器。比较了在LiAsF{sub 6}和LiClO{sub 4}及LiPF{sub 6}溶液中Li沉积的形貌。基本上，Li沉积在LiAsF{sub 6}溶液中的形态比在LiClO{sub 4}或LiPF{sub 6}溶液中平滑得多。溶液中水的存在使在低电位下在铜上形成的表面膜和沉积的Li层的形态变粗糙。先前已知的性能的锂溶液在这些解决方案中的界面和本形态观测之间的相关性进行了讨论。由此获得的结果进一步证明了AFM的适用性，在原位形态学研究的高活性电极表面。
The morphology of Li deposition-dissolution processes in propylene carbonate/LiAsF{sub 6} solutions was studied using in situ atomic force microscopy (AFM). Dry (20 to 30 ppm of water), water contaminated (200 ppm H{sub 2}O), and CO{sub 2} saturated solutions were tested. The substrates included copper foils, which are currently used as current collectors for Li electrodes and metallic lithium. The morphology of Li deposition in dry LiAsF{sub 6} is compared with that observed in LiClO{sub 4} and LiPF{sub 6} solutions. Basically, the morphology of Li deposition in LiAsF{sub 6} solutions is much smoother than in LiClO{sub 4} or LiPF{sub 6} solutions. The presence of water in solutions roughens the morphology of both the surface films formed on copper at low potentials and the Li layers deposited. The correlation between the previously known properties of the Li-solution interphase in these solutions and the present morphological observations is discussed. The results thus obtained further demonstrate the applicability of AFM for in situ morphological studies of highly reactive electrode surfaces.