What question did this study set out to answer?

Investigate the room-temperature structural phase transformations of silicon anodes during electrochemical lithium insertion and extraction.

January 1, 2004Electrochemical and Solid-State Letters

Structural Changes in Silicon Anodes during Lithium Insertion/Extraction

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Authors

MOM. N. ObrovacDalhousie University LCLeif Højslet Christensen3M (United States)

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Implication

Material characterization study reveals sudden crystallization below 50 mV in silicon battery anodes, indicating that voltage control above 50 mV optimizes cycling stability.

Key Points

Investigate the room-temperature structural phase transformations of silicon anodes during electrochemical lithium insertion and extraction.
Conducted electrochemical lithiation and delithiation of silicon anodes at room temperature.
Tracked structural phase transformations and crystal formation using X-ray powder diffraction across varying potential windows.
Demonstrated that initial crystalline silicon transforms into amorphous silicon during lithium insertion, followed by sudden crystallization into a new fully lithiated phase at 50 mV.
Identified that delithiating this crystallized phase converts it back into amorphous silicon.
Observed that cycling silicon anodes strictly above 50 mV prevents crystallization entirely and yields superior cycling retention.

Cite This Study

Obrovac et al. (2004) studied this question.

synapsesocial.com/papers/69d7fad13eff0c9dfaae2fcc https://doi.org/10.1149/1.1652421

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Implication

Material characterization study reveals sudden crystallization below 50 mV in silicon battery anodes, indicating that voltage control above 50 mV optimizes cycling stability.

Structural Changes in Silicon Anodes during Lithium Insertion/Extraction

Discussion

Member takes

Implication

Key Points

Cite This Study

Structural Changes in Silicon Anodes during Lithium Insertion/Extraction

Discussion

Member takes

Implication

Key Points

Cite This Study

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