In situ neutron powder diffraction using custom-made lithium-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Physics

Background:

• Lithium-ion batteries are crucial for electronics and electric vehicles, but face challenges in energy density and lifespan.
• Understanding electrode structural changes during battery operation is key to improving performance.

Purpose of the Study:

• To present a novel in situ neutron powder diffraction (NPD) method for investigating lithium-ion battery electrode behavior.
• To address challenges in energy density and battery lifetime by probing electrode crystal structures.

Main Methods:

• Utilized in situ neutron powder diffraction (NPD) to monitor electrode crystal structure during electrochemical cycling.
• Developed and employed a specialized 'roll-over' battery cell design for NPD experiments.
• Conducted experiments on the WOMBAT instrument at ANSTO.

Main Results:

• NPD data provide insights into the structural mechanisms governing electrode properties.
• The method allows for the determination of crystal structure evolution during battery charge/discharge cycles.
• Successfully demonstrated the application of the in situ NPD technique on a high-intensity instrument.

Conclusions:

• The in situ NPD method is effective for understanding battery electrode performance.
• This research provides a pathway for developing advanced electrode materials and enhancing battery lifespan.
• The study details experimental setup and data analysis strategies for in situ NPD battery research.