| 초록 |
Carbon nanotube (CNT) has been used for a lithium-sulfur battery, which is a promising energy storage device due to its high energy density. A novel self-assembled, porous 3D CNT structures have been synthesized, and then their surfaces have been modified with trench walls, which act as dual hosts for high-areal-capacity sulfur cathodes and lithium anodes. Created by a controllable mechano-chemical method, the unique trench-wall structure provides nano-reactors for active materials with shortened diffusion length, polysulfides-philic and lithiophilic surfaces for hosting active materials, and larger surface areas for promoting electrochemical reactions. The cell showed excellent areal capacity (10 mAh cm-2) after 100 cycles under a high current density of 4.8 mA cm-2, demonstrating both high “cell-level” energy density and power. The trench-wall CNT sponge is, to our best knowledge, the first single material used to simultaneously and effectively tackle the problems from both cathode and anode sides of lithium-sulfur batteries. |
