Abstract
We demonstrate the lithiation process in graphitic anodes using in situ neutron radiography and diffraction in a single-layer pouch cell. The variation in neutron absorption contrast in graphite shows a direct correlation between the degree of lithiation and the discharge potential. The experimental neutron attenuation line profiles across the graphite electrode at various discharge times (potentials) were compared with lithium concentration profiles computed using a 3D electrochemical transport model. In conjunction with imaging/radiography, in situ neutron diffraction was carried out to obtain information about the local structural changes during various stages of lithiation in carbon. Combined in situ radiography and diffraction supported by 3D multiscale electrochemical modeling opens up a powerful nondestructive tool that can be utilized to understand the multiscale nature of lithium transport as well as observe various inhomogeneities at a cell level.
Original language | English |
---|---|
Pages (from-to) | 981-986 |
Number of pages | 6 |
Journal | ACS Energy Letters |
Volume | 1 |
Issue number | 5 |
DOIs | |
State | Published - Nov 11 2016 |
Funding
This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. J.N., H.Z., S.A., S.P., and S.M. acknowledge support from the Office of Vehicle Technology, EERE, DOE. The authors thank Drs. Andrew Payzant and Thomas Proffen for critical reading of the manuscript and valuable comments.