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Suppressing Li Dendrite Puncture with a Hierarchical h-BN Protective Layer
Guojing Li1, Henan Li2, Ye Wang3
1International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.
ACS Applied Materials & Interfaces
|November 17, 2021
Summary
Hierarchical boron nitride (h-BN) coatings on lithium metal anodes prevent dendrite growth, enhancing lithium metal battery (LMB) safety and lifespan. This breakthrough enables stable battery cycling for extended periods.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium metal anodes offer high energy density but suffer from dendrite formation, compromising safety and cycle life in lithium metal batteries (LMBs).
- Controlling lithium dendrite growth is critical for the practical application of rechargeable LMBs.
Purpose of the Study:
- To develop a protective interfacial layer for lithium metal anodes to suppress dendrite formation.
- To enhance the stability, safety, and cycle life of lithium metal batteries.
Main Methods:
- Fabrication of hierarchical hairball-like boron nitride (h-BN) on lithium metal anodes using pulsed laser deposition (PLD).
- Characterization of the h-BN coating as an interfacial layer in Li/BN || BN/Li symmetrical cells.
Main Results:
- The chemically inert and mechanically robust h-BN coating effectively suppressed lithium dendrite formation and propagation.
- The h-BN layer facilitated uniform lithium ion deposition and mitigated electrolyte depletion, reducing voltage polarization.
- Li/BN || BN/Li symmetrical cells demonstrated stable cycling for 1800 hours with no observable polarization.
Conclusions:
- The 3D h-BN interface layer is highly effective in suppressing lithium dendrites in LMBs.
- This approach offers a promising strategy for improving the safety and longevity of lithium metal batteries and potentially other metal-ion battery systems.
