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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
Published on: November 10, 2014
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In situ and quantitative characterization of solid electrolyte interphases.
Arthur v Cresce1, Selena M Russell, David R Baker
1Electrochemistry Branch, Power and Energy Division, Sensor and Electron Devices Directorate, U.S. Army Research Laboratory , Adelphi, Maryland 20783, United States.
Nano Letters
|January 31, 2014
Summary
Understanding the solid electrolyte interphase (SEI) on lithium ion battery anodes is crucial. This study uses in situ electrochemical atomic force microscopy to reveal SEI formation dynamics and structure.
Area of Science:
- Electrochemistry
- Materials Science
- Battery Technology
Background:
- The solid electrolyte interphase (SEI) on graphitic anodes is critical for Li ion battery performance.
- Understanding SEI formation is challenging due to its complexity and lack of in situ tools.
Purpose of the Study:
- To systematically investigate the live formation of the SEI on graphitic anodes.
- To elucidate the structure, hierarchy, and thickness of SEI as a function of electrolyte composition.
Main Methods:
- In situ electrochemical atomic force microscopy (SEAFM) for topographic and quantitative analysis.
- Ex situ chemical analysis to complement in situ observations.
Main Results:
- Detailed topographic images and quantitative data on SEI evolution during initial lithiation.
- A dynamic picture of interphase formation, influenced by electrolyte composition.
- Demonstrated SEI heterogeneity and hierarchical structure.
Conclusions:
- The combined in situ and ex situ approach provides a comprehensive understanding of SEI formation.
- This methodology offers a reliable tool for in situ quality control of SEI layers.
- Insights into SEI dynamics can guide the development of improved Li ion battery electrolytes and anodes.
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