Interfacial Engineering Constructing TFSI- Ion-Sieve Protective Umbrella Guiding Li-Ion Selective Transport and Solid...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Uniform lithium metal plating is crucial for high-performance batteries.
• Challenges include dendrite formation and unstable solid electrolyte interphase (SEI) growth.
• Developing strategies for controlled ion transport and SEI formation is essential.

Purpose of the Study:

• To propose a novel strategy for guiding lithium-ion selective transport and SEI growth.
• To enhance the uniformity of lithium metal plating and stripping.
• To improve the stability and performance of lithium metal batteries.

Main Methods:

• Construction of a TFSI- ion-sieve interlayer.
• Utilizing MgF2 seeds to form dual functional Mg and LiF sites.
• Investigating the coordination reaction between TFSI- and Li+ for ion flux homogenization.
• Analyzing the role of LiF and Mg sites in uniform lithium nucleation and plating.

Main Results:

• The ion-sieve interlayer effectively homogenizes Li+ flux, preventing uneven plating.
• Mg and LiF dual functional sites promote uniform lithium nucleation and deposition.
• Increased LiF content in the SEI enhances its stability and densification.
• Achieved uniform lithium metal plating/stripping through combined ion flux control and solid-state transport.

Conclusions:

• The proposed TFSI- ion-sieve interlayer strategy effectively guides Li+ transport and SEI formation.
• This method leads to uniform lithium metal plating, enhancing battery safety and cycle life.
• The findings offer a promising approach for developing next-generation high-energy-density batteries.