Stable ultrathin lithium metal anode enabled by self-adapting electrochemical regulating strategy
Si-Yuan Zeng , Wen-Long Wang , Deyuan Li , Chunpeng Yang , Zi-Jian Zheng
Energy Materials ›› 2024, Vol. 4 ›› Issue (2) : 400029
Stable ultrathin lithium metal anode enabled by self-adapting electrochemical regulating strategy
Ultrathin lithium (Li) metal foils with controllable capacity could realize high-specific-energy batteries; however, the pulverization of Li metal foils due to its extreme volume change results in rapid active Li loss and capacity fading. Here, we report a strategy to stabilize ultrathin Li metal anode via in-situ transferring Li from ultrathin Li foil into a well-designed three-dimensional gradient host during a cycling process. A three-dimensional carbon fiber with gradient distribution of Ag nanoparticles is placed on the ultrathin Li foil in advance and acts as a Li reservoir, guiding Li deposition into its interior and thus alleviating the volume change of ultrathin Li foil anodes. Hence, a high reversibility of Li metal is achieved and Li pulverization is suppressed, which can be witnessed by a long cyclic life in the symmetric cells. The proposed method offers a versatile and facile approach for protecting ultrathin Li metal anodes, which will boost their commercial application process.
Li metal anode / 3D scaffold / self-adapting / long lifespan / stability
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