Journal
ENERGY STORAGE MATERIALS
Volume 39, Issue -, Pages 403-411Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.04.042
Keywords
Lithium metal anodes; Artificial interface layer; GaLi alloy; Dendrite-free; Li affinity; Stability
Funding
- China Postdoctoral Science Foundation [2020M670666]
- National Science Foundation of Tianjin [20JCQNJC00500]
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The study demonstrates a novel gallium-lithium alloy based dual-protection interface layer for Li metal, which effectively addresses the issues of Li dendrite growth and uncontrollable side reactions with electrolyte, leading to improved long-term stability, efficiency, and safety of lithium metal batteries.
Lithium (Li) metal has been considered as an ideal anode for high-energy density rechargeable batteries. However, it faces huge obstacles toward practical application due to the growth of Li dendrites and the uncontrollable side reactions with electrolyte. Here, we demonstrate a novel gallium-lithium alloy based dual-protection interface layer for Li metal by a facile in-situ ion-exchange reaction that possesses long service life for effectively alleviating the extra consumption of active Li as well as homogenizing the Li deposition. Such dual-protected feature is attributed to its outstanding stability, excellent Li affinity and favorable charge transfer kinetics. By means of in-situ visualization electrodeposition studies, the modified Li metal (GaLi-Li) anode can effectively suppress the Li dendrite even under a high deposition capacity of 7 mAh cm(-2). Moreover, the GaLi-Li based symmetric cell achieves excellent cycling stability for over 1500 cycles at a high current density of 5 mA cm(-2). Pairing the GaLiLi anodes with LiFePO4 and LiNi0.8Co0.1Mn0.1O2 cathodes, the cells also realize better long-term cycling stability with higher discharge capacity than that of the bare Li. Our strategy offers a practical way to realize highly stable and safety Li metal batteries.
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