|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Materials for Energy Conversion and Storage
||Phase Field Studies of Mechanical and Electrochemical Behavior of Li-ion Battery Electrode Materials
||Bai-Xiang Xu, Ying Zhao, Peter Stein
|On-Site Speaker (Planned)
In pursuit of larger capacity, potential materials such as Si, Sn, and Sb have been introduced as alternative anode materials to graphite in Li-ion batteries. However, those electrodes experience irreversible mechanical degradation already after few charge/discharge cycles due to high stresses. Nanostructured electrodes have been shown to have a better performance and a higher robustness against the internal degradation processes. This is accompanied by strong size- and shape- effects, which are attributed to surface effects on small scales. A phase-field model and FE simulation results are presented in this talk to demonstrate the mechanical behavior and electrochemical process of electrode particles. Phase segregation and fracture behavior during lithiation and delithiation in Si particles are simulated. The electrochemical reactions on exterior and interior surfaces and surface tension are considered. Results reveal the influence of charging/discharging conditions, particle size and geometry, elastic properties and diffusitivity.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)