Spatially Selective Solvation Structure by Electronegative Micro-Arrays for Stable Lithium-Metal Anode Interface.

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Stabilizing lithium metal anodes is crucial for high-energy-density batteries.
• Conventional electrolytes struggle with anion-derived interface stabilization due to anode repulsion.
• Achieving uniform lithium deposition and preventing dendrites remains a challenge.

Purpose of the Study:

• To develop a novel strategy for stabilizing the electrolyte-lithium metal anode interface.
• To enhance the formation of beneficial inorganic components at the anode interface.
• To improve the cycling performance and safety of lithium metal batteries.

Main Methods:

• Fabrication of nano-hydroxyapatite (nHA) micro-arrays on copper (Cu) foil.
• Utilizing the strong Li+ adsorption capability of nHA's electronegative oxygen atoms.
• Creating a locally high Li+ concentration region at the electrolyte-anode interface.

Main Results:

• nHA micro-arrays effectively adsorb Li+, increasing local Li+ concentration.
• Enhanced Li+ coordination with anions promotes their decomposition into LiF and Li3N.
• Suppressed lithium dendrite growth, leading to high Coulombic efficiency and long lifespan under high current density.

Conclusions:

• The nHA micro-array strategy successfully modifies the solvation structure at the electrolyte-anode interface.
• This approach ensures stable interface formation without altering bulk electrolyte salt concentration.
• The method offers a promising pathway for developing high-performance and safe lithium metal batteries.