Journal
ENERGY TECHNOLOGY
Volume 8, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202000348
Keywords
lithium dendrite growth; lithium-metal anodes; lithium-sulfur batteries; solid-electrolyte interphase; surface coating
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0005397]
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Metallic lithium (Li) has attracted considerable interest as a high-capacity anode material for the next-generation Li-metal batteries, yet its commercial availability is still challenged by its strong reactivity with electrolyte and uncontrollable growth of Li dendrites. Herein, a tuned Li anode is fabricated through a facile surface modification strategy. The LiF-dominant artificial coating layer, due to its low surface-diffusion energy barrier and excellent chemical stability against Li and electrolyte, is efficient in stabilizing the solid-electrolyte interphase (SEI) and directing homogeneous Li stripping/plating upon repeated cycling. Therefore, it significantly mitigates the corrosion reaction on the anode side and restrains the Li dendrite growth, contributing to suppressed anode degradation. As a result, the tuned Li metal achieves high symmetric cell performance, delivering a substantially decreased voltage overpotential of 37 mV over 3000 h of cycling (>4 months) at high current density (up to 8 mA cm(-2)). Moreover, the assembled high-loading Li-S pouch cells (200 mg of sulfur) using the tuned Li anode approach a high capacity (up to 189 mA h) together with good electrochemical cyclability. This work presents a viable route to regulate the Li surface chemistry and interface property for dendrite-free Li-metal anodes.
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