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A facile surface alloy-engineering route to enable robust lithium metal anodes
Xiaobin Liao1, Qian Liu1, Xiaolin Liu1
1State Key Laboratory of Silicate Materials for Architectures, International School of Materials Science and Engineering, Wuhan University of Technology, No. 122 Luoshi Road, Wuhan 430070, People's Republic of China. kangning.zhao@epfl.ch.
Physical Chemistry Chemical Physics : PCCP
|February 10, 2022
Summary
Li-rich alloys create self-smoothing artificial solid electrolyte interphase (SEI) layers, preventing lithium dendrite growth and electrolyte decomposition for safer, advanced lithium metal batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Chemistry
Background:
- Lithium metal anodes are crucial for high-energy batteries but suffer from dendrite formation and electrolyte instability.
- Artificial solid electrolyte interphase (SEI) layers are key to stabilizing lithium metal anodes.
- Li-rich alloys show promise for advanced SEI layer applications.
Purpose of the Study:
- To systematically investigate the role of Li-rich alloys in lithium deposition and electrolyte decomposition.
- To elucidate the mechanisms behind dendrite suppression by Li-rich alloy SEI layers.
- To understand the relationship between alloy properties and electrolyte stability.
Main Methods:
- Density Functional Theory (DFT) simulations were employed to model Li-rich alloy surfaces.
- Analysis of surface electronic structure, including Li s states and surface work function.
- Investigation of Li deposition behavior and electrolyte molecule interactions with alloy surfaces.
Main Results:
- Li-rich alloy surfaces demonstrate self-smoothing behavior, effectively suppressing lithium dendrite nucleation.
- This self-smoothing is attributed to surface-localized free electrons, enhancing Li-affinity.
- Li-rich alloys significantly reduce electron transfer between electrolytes and the anode surface.
- Alloys with low Li s states at the Fermi level and high surface work function exhibit reduced electrolyte reducibility.
Conclusions:
- Li-rich alloys function as effective artificial SEI layers for lithium metal anodes.
- The unique electronic properties of Li-rich alloys enable dendrite suppression and enhanced electrolyte stability.
- These findings provide crucial insights for the design of next-generation lithium metal batteries.
