ScholarWorks@중앙대학교

초록

Constructing hierarchical architecture consisting of low-dimensional building blocks is attracting attention as an efficient strategy for achieving high electrochemical performance for lithium-ion batteries (LIBs). Herein, convenient synthesis of Co-Mo oxide composites embedded in a hierarchical N-doped carbon microflower (Co-Mo oxide/NC) is demonstrated. The Co-Mo/polydopamine (PDA) precursor prepared by the spontaneous coordination between the metal ion and dopamine can be easily transformed into Co-Mo oxide/NC by a two-step thermal annealing process. The as-obtained hierarchical microflowers have the advantages of hierarchical structured electrode materials, such as increased contact area with the electrolyte, abundant ion storage sites, and high electrical conductivity. Concurrently, the synergistic effect between molybdenum and cobalt ions can improve the electrochemical performance. Consequently, the hierarchical microflowers as LIB anode materials exhibit a high reversible specific capacity of 1115 mA h g−1 at 1.0 A g−1 after 200 cycles and superior rate performance with a capacity of 577 mA h g−1 at 30.0 A g−1. Moreover, in the long-term cycling stability at a high current density (10.0 A g−1), the electrode shows excellent cycling stability with a capacity of 508 mA h g−1 for 500 cycles. The present study reveals the importance of designing hierarchical structured materials to enhance electrochemical energy storage applications.

키워드