Effects of interfacial lithium-ion concentration on lithium metal anode
발표자
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초록
내용
Despite strenuous efforts to develop multidimensional state-of-the-art electrode materials for constructing better lithium metal anodes (LMAs), key factors influencing electrochemical performances of LMAs are still poorly understood. Herein, we report that interfacial lithium-ion concentration exerts significant influence on electrochemical performances of LMAs. The interfacial ion concentration can be multiplied by introducing pseudocapacitive nanocarbons (PNCs) with three-dimensional structure and numerous heteroatoms because PNCs can store large numbers of lithium ions as both pseudocapacitive manner and electrochemical double layer formation. The high interfacial lithium-ion concentration induces formation of lithium-rich inorganic solid–electrolyte–interface layers with high ionic conductivities and facilitates sustainable and stable supplies of charge carriers on the overall active surfaces of the PNCs. Accordingly, the PNC-based LMA exhibits high Coulombic efficiencies, high-rate capabilities, and stable cycling performance.