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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

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First principles study of lithium insertion in bulk silicon.

Wenhui Wan¹, Qianfan Zhang, Yi Cui

¹Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 10, 2011

Summary

Lithium (Li) atoms in silicon anodes prefer interstitial sites, diffusing via a T(d)-Hex-T(d) path. At higher concentrations, Li clustering occurs due to lattice distortions and Si-Si bond breaking.

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Area of Science:

Materials Science
Electrochemistry
Computational Physics

Background:

Silicon is a promising anode material for advanced lithium-ion batteries due to its high theoretical capacity.
Understanding lithium behavior in silicon is crucial for optimizing battery performance and longevity.

Purpose of the Study:

To investigate the energetics and dynamics of lithium atoms within bulk silicon.
To analyze the structural transitions in lithium-silicon alloys at varying lithium concentrations.

Main Methods:

First-principles calculations were employed to study lithium-silicon interactions.
Energetics, diffusion pathways, and local structural changes were systematically analyzed.

Main Results:

Lithium atoms preferentially occupy interstitial tetrahedral (T(d)) sites in silicon, acting as shallow donors.
The primary diffusion mechanism involves a T(d)-Hex-T(d) trajectory with a 0.58 eV energy barrier.
At low concentrations (x ≤ 0.125), lithium distribution is homogeneous. At higher concentrations (x ≥ 0.125), lithium clustering is induced by lattice distortions and Si-Si bond breaking, leading to dangling bonds and negatively charged zones.

Conclusions:

The interstitial T(d) site is the most stable position for lithium in silicon.
Lithium diffusion in silicon is characterized by a specific energy barrier and pathway.
High lithium concentrations promote clustering through structural degradation of the silicon lattice, impacting anode stability.