Effect of Anthraquinone‐Substituted Graphdiyne Analog on the Growth of Lithium Dendrites

Abstract

AbstractEnhancing the cycling efficiency and controlling lithium dendrite growth through a stable and heterogeneous lithium‐electrolyte interface are crucial steps for the practical application of lithium metal batteries. In this study, a carbon network composed of graphdiyne modified with redox‐active anthraquinone units (AN‐GDY) is developed to optimize the performance of the battery separator (PE film) also lithium anode. The AN‐GDY films are integrated with the conventional commercial battery separator (PE film) to create a double‐separator system, aimed at enhancing the interior characteristics of the battery. Electrochemical tests confirme that lithium symmetric batteries with AN‐GDY/PE double‐separator system can deliver high areal capacities of 1, 2, and 5 mAh cm−2 and ultra‐high current densities of 1, 2, and 5 mA cm−2 stable Li plating/stripping for over 800 h. Furthermore, lithium batteries employing AN‐GDY as the lithium anode preserve a capacity of 100 mAh g−1 and exhibite a Coulombic efficiency exceeding 98% after 5000 cycles, even at a high current rate of 500 mA g−1.