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An artificial interfacial layer with biomimetic ionic channels towards highly stable Li metal anodes
Yiju Li1, Tianshuai Wang2, Junjie Chen3
1Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Science Bulletin
|June 19, 2023
Summary
A new cytomembrane-inspired artificial layer (CAL) prevents lithium dendrite growth in lithium metal anodes (LMAs). This breakthrough enables stable cycling and supports high-energy lithium-sulfur batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium metal anodes (LMAs) offer high energy density but suffer from dendrite growth, hindering safety and reversibility.
- Dendrite formation leads to short circuits and capacity fade in lithium metal batteries (LMBs).
Purpose of the Study:
- To develop a dendrite-free and highly reversible LMA using a novel artificial layer.
- To enhance the stability and performance of next-generation batteries, particularly lithium-sulfur (Li-S) cells.
Main Methods:
- A cytomembrane-inspired artificial layer (CAL) with biomimetic ionic channels was developed using a scalable spread coating method.
- The CAL was designed to facilitate uniform Li-ion transport and redistribution, promoting stable Li plating and stripping.
- An in-situ formed transition layer and the CAL's high Young's modulus were utilized to suppress dendrite growth and side reactions.
Main Results:
- The cytomembrane-inspired artificial Janus layer (CAJL)-protected LMA (Li@CAJL) demonstrated stable cycling at 10 mAh cm-2 and 10 mA cm-2.
- A practical Li-S pouch cell with Li@CAJL achieved 429.2 Wh kg-1 at a low electrolyte/sulfur ratio (3 μL mg-1).
Conclusions:
- The CAL strategy effectively suppresses lithium dendrite growth, enabling highly reversible Li metal anodes.
- This facile protection method significantly advances the practical application of high-energy-density lithium metal batteries.
