Gradient Solid Electrolyte Interphase and Lithium-Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium...

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• The performance of full cells is critically dependent on the solid electrolyte interphase (SEI) layer.
• Controlling the structure and composition of the SEI remains a significant challenge in battery research.

Purpose of the Study:

• To design an electrolyte additive, bisfluoroacetamide (BFA), for constructing a gradient SEI structure.
• To enhance lithium-ion management and improve the stability of full cells.

Main Methods:

• Utilizing bisfluoroacetamide (BFA) as an electrolyte additive.
• Investigating the formation of a gradient SEI with a lithophilic surface and LiF-rich bottom layer.
• Analyzing changes in Li+ solvation structure and electrolyte properties.

Main Results:

• The designed gradient SEI facilitates uniform Li+ capture and rapid Li+ transport.
• BFA addition promotes homogeneous Li+ deposition, enhancing battery performance.
• A superior cathode electrolyte interphase (CEI) with high LiF content was formed, improving electrolyte stability.

Conclusions:

• Bisfluoroacetamide (BFA) is an effective additive for creating high-quality gradient SEIs.
• The developed SEI structure significantly improves full cell performance by optimizing Li+ dynamics and electrolyte stability.