About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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Presentation Title |
Cracking in a Reacted Layer Material |
Author(s) |
C. Barry Carter, Chanchal Ghosh, Manish Kumar Singh, Matthew T Janish, Shayani Parida, Arthur Dobley, Avinash M Dongare |
On-Site Speaker (Planned) |
C. Barry Carter |
Abstract Scope |
In this study, the reaction between Li/Li2O and MoS2 has taken place in the transmission electron microscope (TEM) with the basal plane in the edge-on orientation; nanolayers of reacted material were observed to develop in real-time as the Li moved into the gaps followed by the formation of so-called ‘white-line defects’. Energy-filtered TEM (EFTEM) analysis shows that these lines are rich in Li and poor in Mo and S. Atomic-resolution TEM studies in an aberration-corrected TEM show the different stages of the microstructural evolution along these white line defects. The present paper will discuss the cracking that can then can occur along these white-line defects when a relatively small external stress is applied. This cracking subsequently leads to exfoliation and the structural degradation of the intercalated material and is directly relevant to understanding the safe operation and reliability of future lithium-ion batteries. These direct observations are complemented by atomistic modeling. |