A multi-sample automatic system for in situ electrochemical X-ray diffraction synchrotron measurements.

Area of Science:

• Materials Science
• Electrochemistry
• Analytical Chemistry

Background:

• In situ electrochemical X-ray diffraction (XRD) is crucial for understanding battery material behavior during operation.
• Existing methods often face limitations in automation, sample throughput, and data acquisition speed.

Purpose of the Study:

• To develop and implement an automated system for continuous in situ electrochemical X-ray diffraction measurements.
• To demonstrate the system's capability in analyzing structural dynamics of lithium-ion battery electrodes.

Main Methods:

• Development of an automated system integrating a sample changer, improved electrochemical cells, and control software.
• Implementation at the MS-X04SA beamline (Swiss Light Source) utilizing the MYTHEN microstrip detector for fast data acquisition.
• Testing the system with two case studies: LiCoO2 positive electrodes during charging and graphite negative electrodes with ionic liquid co-intercalation.

Main Results:

• The automated system successfully performed continuous in situ electrochemical XRD measurements on up to 32 samples sequentially.
• High-resolution, fast data acquisition enabled detailed observation of structural changes in LiCoO2 electrodes.
• The system effectively characterized the co-intercalation effects of ionic liquids in graphite electrodes.

Conclusions:

• The developed automated in situ electrochemical XRD system significantly enhances the efficiency and capability for battery material research.
• This advanced setup provides valuable insights into dynamic structural evolution during battery cycling and ionic liquid interactions.