| 摘 要： |
Biomass-derived carbon materials have shown great potential for electrochemical energy storage application due to their natural abundance, high porosity, and hierarchical structure. Herein, we report the fabrication of tubular catkin-derived carbon microtubes (denote as CMTs) by directly annealing catkin in Ar, and study the effect of activation on their physicochemical characteristics as well as their lithium storage performance/behavior. The activated CMTs (a-CMTs), which are obtained by annealing pristine CMTs (p-CMTs) (436 m(2) g(-1), 0.109 cc g(-1)) with KOH as the activating agent, display a porous structure with a high specific area (1048 m(2) g(-1)) and large pore volume (0.751 cc g(-1)). When examined as anode materials for lithium-ion batteries, both p-CMTs and a-CMTs show excellent cycling and rate performance, delivering reversible capacities of 397 and 493 mA h g(-1) after 400 cycles at 100 mA g(-1), respectively, which correspondingly show pseudocapacitive and diffusion-controlled lithium storage behaviors. |
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