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Flexible Organic-Polyphosphates Interfacial Layer for Stable Lithium Metal Anode.
Yueli Hu1, Yuejiao Chen1, Dingrong Guo1
1National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, P. R. China.
ACS Applied Materials & Interfaces
|March 6, 2025
Summary
Researchers developed a flexible hybrid solid electrolyte interphase (SEI) layer using organophosphorus and inorganic materials. This stable SEI layer effectively suppresses lithium dendrite growth and volume expansion in lithium metal batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium (Li) metal anodes are crucial for high-energy-density batteries due to their high specific capacity and low redox potential.
- However, Li metal batteries face challenges like lithium dendrite growth and volume expansion during cycling, hindering practical application.
Purpose of the Study:
- To design and fabricate a flexible, stable artificial solid electrolyte interphase (SEI) layer for lithium metal anodes.
- To enhance the performance and cycle life of lithium metal batteries by addressing dendrite formation and volume expansion issues.
Main Methods:
- An artificial organophosphorus-inorganic Li hybrid flexible SEI layer was created via prereaction between phytic acid (PA) and lithium hydroxide (LiOH).
- The resulting organic-polyphosphate (PALi) layer was characterized for its ion conductivity, lithiophilicity, and mechanical flexibility.
- Tested Li metal battery cells (PALi@Cu∥Li and PALi@Cu-Li∥Li symmetrical cells) to evaluate performance metrics like Coulombic efficiency and voltage hysteresis.
Main Results:
- The PALi layer demonstrated numerous channels for rapid Li+ conductivity and improved lithiophilicity due to uniform phosphorus distribution.
- The SEI layer's flexibility, attributed to hydrogen bonds, effectively mitigated the impact of Li volume expansion.
- PALi@Cu∥Li cells achieved 98.85% Coulombic efficiency over 500 cycles at 0.5 mA cm⁻², and symmetrical cells maintained stability with 20 mV voltage hysteresis for 2000 h at 1 mA cm⁻².
Conclusions:
- The developed organic-inorganic hybrid SEI layer provides a feasible strategy for fabricating stable and efficient artificial SEI layers.
- This approach significantly enhances the practical applicability of lithium metal batteries by improving cycling stability and safety.
