期刊
JOURNAL OF POWER SOURCES
卷 506, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230158
关键词
Lithium metal anodes; Artificial solid electrolyte interphase; Lithium dendrite; Lithium selenide; Lithium chloride
资金
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20194010201890, 20194030202450]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20194010201890] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A stable artificial solid electrolyte interphase (SEI) layer consisting of Li2Se and LiCl has been developed using a simple and low-cost method, effectively preventing dendrite formation on lithium metal anodes and improving cycling performance and capacity.
Li dendrite growth and corresponding parasitic reactions are inherent vulnerability of lithium metal anodes, limiting practical adoption. Here, we report a stable artificial solid electrolyte interphase (SEI) layer consisting of Li2Se and LiCl with high Li ion conducting and insulating properties fabricated through a facile and low-cost approach. The designed artificial SEI layer on Li blocks direct contact with the electrolyte and enables dendrite-free Li plating through the artificial SEI layer. With these benefits, Li anodes modified with an artificial SEI show dendrite-free Li plating behaviors with a lower porosity of 30% compared to that of bare Li (43%) at a high current density of 5.0 mA cm-2 and a high capacity of 40 mAh cm-2. In addition, modified anodes exhibit stable cyclability with lower overpotentials in Li symmetric cells operated at 1.0 mA cm-2 with 1.0 mAh cm-2 for 400 cycles. The significant improvement in cycling performance over hundreds of cycles is achieved using LiCoO2 and LiFePO4 cathodes. Furthermore, higher average Coulombic efficiency of 96.4% is realized in a full cell consisting of a high-capacity Ni0.8Co0.1Mn0.1O2 (3.5 mAh cm-2) and thin (50 mu m) modified Li anodes compared to that of bare Li anodes (94.3%).
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