WEB Structural design of disordered carbon anode for Na-ion and K-ion storageWednesday (23.09.2020) 15:00 - 15:15 Z: Special Symposia I Part of:
The large-scale application of lithium-ion batteries (LIBs) is confronted with the limitation of rare lithium resources (20 ppm in the earth crust) and its uneven geographical distribution on the earth. The room temperature Na-ion batteries (NIBs) and K-ion batteries (KIBs) are recognized as promising candidates to LIBs due to abundant resources (~23600 ppm for Na and ~20000 ppm for K) and low cost, especially in large-scale energy storage system which preferentially consider the cost, high power density and long cycling life. 2D carbon materials with substantial and abundant nature are deemed as one kind of the most promising anode in both Na-ion and K-ion storage. However, carbon anode has much diverse ion storage electrochemistry and mechanism in NIBs and KIBs, and thus needing different material design strategy. In the present study, we report the structural design and synthesis strategy of disordered carbons to address the need of high-performance anode for NIBs and KIBs. This work is focus on studying the relationship between the crucial structure and electrochemical energy storage properties including interlayer spacing, surface area and pore structure. The engineering of solid electrolyte interface of disordered carbon anode is also involved to further boost the ion transport and improve the Coulombic efficiency. The mechanism for the enhanced electrochemical performance were comprehensively studied combing experimental route and density functional theory (DFT) calculations.