Skip to main content

Origin of Structural Degradation in Li-rich Layered Oxide Cathode

Start Date
23-06-2023 10:00
End Date
23-06-2023 11:00
Auditorium, Central Building
Speaker's name
Luxi Li
Speaker's institute
X-ray Science Division, Advanced Photon Source, Argonne National Laboratory
Contact name
Jakub Drnec
Host name
Jakub Drnec
Add event to calendar
iCal | vCal


Join Zoom Meeting

Meeting ID: 592 118 4570
Passcode: 616807




Li and Mn-rich (LMR) layered oxide cathode materials can substantially increase battery energy density by facilitating both cation and anion redox energy. However, the cathode material suffers from continuous voltage decay over the charge/discharge cycles and results in capacity loss. Coherent X-ray Diffraction (CXD) techniques are invaluable for investigating the morphology, structural and strain information in crystalline specimens under in-situ and operando conditions [1-2]. In this presentation, Li1.2Ni0.13Mn0.54Co0.13O2 is used as a benchmark to explore the origin of structural degradation in LMR cathode materials [3]. In-situ CXD techniques are used to visualize the strain accumulation in the charging process that leads to an abrupt oxygen loss to release the lattice strain. In the meanwhile, a new phase with a trace quantity is observed from the microbeam diffraction that supports the hypothesis of oxygen loss. These results highlight the significance of lattice strain in the voltage decay mechanism and will inspire a wave of efforts that seek novel solutions for eliminating this issue.

 [1] Ian Robinson & Ross Harder, Nat. Mater. 8, 291–298 (2009)
[2] Luxi Li, Yingying Xie, Evan Maxey, & Ross Harder J. Synchrotron Rad. 26, 220-229 (2019).
[3] Tongchao Liu, Luxi Li, et al. Nature 606. 305-312 (2022).
Visitors from off-site please contact Jakub Drnec tel +33 6 49 68 13 88 to arrange for a gate pass.
Requests made by e-mail will be confirmed.
If you do not receive a confirmation e-mail, please contact us by phone.