Numerical investigation on structural evolution and mechanical behaviour of amorphous silicon Li ion battery anodes
Poster
Paper/Presentation Title | Numerical investigation on structural evolution and mechanical behaviour of amorphous silicon Li ion battery anodes |
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Presentation Type | Poster |
Authors | Sitinamaluwa, Hansinee (Author), Wang, Mingchao (Author), Will, Geoffrey (Author), Senadeera, Wijitha (Author), Ling, Ming (Author), Zhang, Shanqing (Author) and Yan, Cheng (Author) |
Year | 2015 |
Place of Publication | Brisbane, Australia |
Web Address (URL) of Paper | http://www.rsc.org/events/detail/18750/9th-international-mesostructured-materials-symposium |
Conference/Event | 9th International Mesostructured Materials Symposium (IMMS-9) |
Event Details | 9th International Mesostructured Materials Symposium (IMMS-9) Event Date 17 to end of 20 Aug 2015 Event Location Brisbane, Australia |
Abstract | Silicon (Si) is widely regarded as one of the most promising anode materials for Li ion battery (LIB) due to its high theoretical specific capacity. However, the volume change (~300%) during lithiation/delithiation results in poor mechanical integrity, which impedes its commercialization. To address this issue, a better understanding of the atomistic mechanisms behind lithiation is necessary. In this work, the atomic structure and stress evolution during lithiation/delithiation was investigated on an amorphous silicon film (2.7 nm) using molecular dynamics. Steep stress gradients were observed when the lithium content in the anode is very low (<Li0.5Si). Plastic flow and stress relaxation are dominant in higher Li concentrations. The microstructure evolution during lithiation process is associated with the break of covalent amorphous structure into small clusters, when Li concentration exceeds ~Li0.5Si. At a low Li concentration, the sharp stress increase is due to the elastic deformation of the covalent Si lattice. The Radial Distribution Function (RDF) analysis revealed a defective amorphous structure in silicon film after a complete lithiation/delithiation cycle, which is attributed to breaking down of covalent silicon network and subsequent plastic flow. These results are believed to be able to help improve the materials selection and design of next generation Li ion battery. |
Keywords | Li ion battery, anode, mechanical behaviour |
ANZSRC Field of Research 2020 | 401703. Energy generation, conversion and storage (excl. chemical and electrical) |
Public Notes | Poster. c. 2016 QUT. |
Byline Affiliations | Queensland University of Technology |
Griffith University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q46z5/numerical-investigation-on-structural-evolution-and-mechanical-behaviour-of-amorphous-silicon-li-ion-battery-anodes
1050
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