In Situ Determination of the Liquid/Solid Interface Thickness and Composition for the Li Ion Cathode LiMn1.5Ni0.5O4
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- 作者：James F. Browning ; Lo茂c Baggetto ; Katherine L. Jungjohann ; Yongqiang Wang ; Wyatt E. Tenhaeff ; Jong K. Keum ; David L. Wood ; III ; Gabriel M. Veith
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：November 12, 2014
- 年：2014
- 卷：6
- 期：21
- 页码：18569-18576
- 全文大小：374K
- ISSN：1944-8252
文摘
Using neutron reflectometry, we have determined the thickness and scattering length density profile of the electrode鈥揺lectrolyte interface for the high-voltage cathode LiMn1.5Ni0.5O4 in situ at open circuit voltage and fully delithiated. Upon exposure to a liquid electrolyte, a thin 3.3 nm Li-rich interface forms due to the ordering of the electrolyte on the cathode surface. This interface changes in composition, as evident by an increase in the scattering length density of the new layer, with charging as the condensed layer evolves from being lithium rich to one containing a much higher concentration of F from the LiPF6 salt. These results show the surface chemistry evolves as a function of the potential.