Abstract
In lithium-ion battery electrode materials, internal mechanical strain is coupled to electrochemical processes. As a result, lithium-ion electrodes can be used for mechano-electrochemical energy harvesting. A promising way to investigate this mechano-electrochemical coupling is through neutron scattering, which can measure the lighter elements that compose battery anodes. In this paper, we conduct in-situ neutron diffraction studies on commercial lithium-ion pouch cells using the VULCAN diffractometer at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. By applying stress on these pouch cells, and examining the phase-specific lattice strains, Bragg peak intensities, and peak broadening, we can gain insight into the mechano-electrochemical correlation in lithium-ion electrodes. We measure a negative electrochemical lattice strain of the graphite electrode, indicating that stress causes lithium ions to leave the graphite structure.
| Original language | English |
|---|---|
| Title of host publication | 240th ECS Meeting - New Approaches and Advances in Electrochemical Energy Systems |
| Publisher | IOP Publishing Ltd |
| Pages | 75-85 |
| Number of pages | 11 |
| Edition | 1 |
| ISBN (Electronic) | 9781607685395 |
| DOIs | |
| State | Published - 2021 |
| Event | 240th ECS Meeting - Orlando, United States Duration: Oct 10 2021 → Oct 14 2021 |
Publication series
| Name | ECS Transactions |
|---|---|
| Number | 1 |
| Volume | 104 |
| ISSN (Print) | 1938-6737 |
| ISSN (Electronic) | 1938-5862 |
Conference
| Conference | 240th ECS Meeting |
|---|---|
| Country/Territory | United States |
| City | Orlando |
| Period | 10/10/21 → 10/14/21 |
Funding
The research described in this paper was primarily supported by Princeton University, and partially supported by NSF through the Princeton University (PCCM) Materials Research Science and Engineering Center DMR-1420541. The neutron diffraction work used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors thank Matthew Frost and Harley Skorpenske for their support for the neutron experiments.
