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Lee, Hyun-Wook
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Understanding interaction of anode materials in lithium ion batteries through in situ transmission electron microscopy

Author(s)
Lee, Hyun-Wook
Issued Date
2017-11-21
URI
https://scholarworks.unist.ac.kr/handle/201301/37259
Citation
The 4th International Conference on Advanced Electromaterials
Abstract
Extensive research for new energy storage materials has created a high demand for experimental techniques that
can provide real-time, single-particle-level information on the dynamic electrochemical processes taking place at the
electrode materials during battery charge/discharge cycles. In situ transmission electron microscopy (TEM) on
lithium ion batteries has been offered exceptional opportunities for monitoring the dynamic processes of electrode
materials during electrochemical reaction at both spatial and temporal resolution.
In this talk, I will introduce in situ TEM studies on Si anodes which suffers the anomalous volumetric changes and
fracture during lithiation process. Previously, the lithiation behaviour of a single Si particle has been explained in
detail by simulation data and experimental observation. However, in real batteries, since lithiation occurs
simultaneously in clusters of Si in a confined medium, understanding how the individual Si structures interact during
lithiation in a closed space is necessary. In this regard, I demonstrated physical and mechanical interactions of
swelling Si structures during lithiation using well-defined Si nanopillar pairs. Ex situ SEM and in situ TEM studies
reveal that compressive stresses change the reaction kinetics so that preferential lithiation occurs on free surfaces
when the pillars are mechanically clamped. Such mechanical interactions enhance the fracture resistance of lithiated
Si by lessening the tensile stress concentrations in Si structures. This experiment reveals the surprising effects of
nanostructure shape, size, and void space for lithiation and the results will contribute to improved design of Si
structures at the electrode level for high-performance Li-ion batteries.
Publisher
한국전기전자재료학회

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