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首页> 外文期刊>Advanced energy materials >Structurally Tailored Hierarchical Cu Current Collector with Selective Inward Growth of Lithium for High-Performance Lithium Metal Batteries
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Structurally Tailored Hierarchical Cu Current Collector with Selective Inward Growth of Lithium for High-Performance Lithium Metal Batteries

机译：Structurally Tailored Hierarchical Cu Current Collector with Selective Inward Growth of Lithium for High-Performance Lithium Metal Batteries

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摘要

Li-metal is gaining attention as a next generation anode active material, of whichthe primary attribute is its energy density. However, Li dendrite formation is theprimary challenge. Herein, a design strategy with increased structural dimensionsand hierarchy for Li-metal anode is investigated to stabilize the dendrite formationfor extending the cycle life with high reversibility. For this, diverse structural currentcollectors (CCs) are fabricated by manipulating structural design in differentlength scales and characterized as a Li-metal anode. The hierarchy (i.e., nanostructuresinside the microcavities) can not only reduce the current density on entireanode surface but also concentrate the local electrical field onto inner surfaces ofthe microstructures, inducing preferential Li nucleation inside microcavities andpromoting confined growth of Li. It is confirmed that introduction of structuralhierarchy can enhance the cycle life by 364% and the preservation of coulombicefficiency > 90% by 266%. The design strategy is extended by exploring a practicalone-step fabrication of the hierarchical CC with even greater performance via theinward growth mechanism. This work elucidates the mechanism of inward Ligrowth using tailored surface geometries for Li dendrite suppression, which can.

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