Abstract
Integrity and uniformity are crucial factors for stable, safe, robust and well-predicted operation of Li-ion batteries. The uniformity of lithium distribution in the graphite anode in fully charged state was studied by a combination of spatially-resolved time-of-flight neutron diffraction, powder diffraction using synchrotron radiation and electrochemical measurements. Studies were carried out on a series of NCA|C Li-ion cells of 18650-type with various cycle numbers. Experimentally obtained lithium distribution under in operando and ex situ conditions have been found in fair agreement and revealed a non-uniform character of lithiation in the graphite anode in charged state, where the degree of heterogeneity increases with the number of cycles.
| Original language | English |
|---|---|
| Article number | 227466 |
| Journal | Journal of Power Sources |
| Volume | 448 |
| DOIs | |
| State | Published - Feb 1 2020 |
| Externally published | Yes |
Funding
This work was in part supported by Technische Universität München, Karlsruhe Institute of Technology and PETRA III synchrotron. Technical assistance and help of Mr. J. Pfanzelt is gratefully acknowledged. The authors also acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, SNS and MLZ for the granted access to their experimental facilities. Studies using synchrotron radiation were carried out at PETRA III synchrotron using beamline P02.1 and P24. Time-of-flight neutron diffraction experiments were carried out at the Spallation Neutron Source (SNS), which is the U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences. This work was in part supported by Technische Universität München , Karlsruhe Institute of Technology and PETRA III synchrotron . Technical assistance and help of Mr. J. Pfanzelt is gratefully acknowledged. The authors also acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, SNS and MLZ for the granted access to their experimental facilities. Studies using synchrotron radiation were carried out at PETRA III synchrotron using beamline P02.1 and P24. Time-of-flight neutron diffraction experiments were carried out at the Spallation Neutron Source (SNS), which is the U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences.
Keywords
- 18650
- Li-ion batteries
- Synchrotron radiation
- Time-of-flight neutron powder diffraction
- Type
- X-ray diffraction radiography
