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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Surface-Activated Graphite Paper for High-Performance Lithium-Polysulfide Batteries
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Surface-Activated Graphite Paper for High-Performance Lithium-Polysulfide Batteries

机译：用于高性能锂多硫化物电池的表面活性石墨纸

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摘要

The high theoretical specific capacity and high energy density of Li-S system has attracted researchers around the globe for further exploration of this energy storage system. However, the practicality of this system is hampered by low active material utilization and poor cycle life. In the present study, surface-modified graphite paper is used as a substrate to host active sulfur and it also serves as current collector. The fabricated cell is subjected to electrochemical measurements including cyclic voltammetry, charge-discharge cycling, and electrochemical impedance spectroscopy. The cells deliver an initial discharge capacity of 1456, 1246, 918, 680, and 497 mA h g(-1) at 0.05, 0.1, 0.2, 1, and 2C respectively. Specific capacity retention of 60% with Coulombic efficiency of 96% is obtained at a current rate of C/10 over 100 cycles. Because of the presence of conducting graphite paper matrix, the cell with high sulfur loading exhibits good Coulombic efficiency as well as rate capability.
机译：Li-S系统的高理论特异性和高能量密度吸引了全球研究人员，以进一步探索这种能量储存系统。然而，该系统的实用性受到低活性材料利用率和循环寿命不良的阻碍。在本研究中，表面改性的石墨纸用作宿主活性硫的基材，并且它也用作集电器。经过制造的电池，经受电化学测量，包括循环伏安法，电荷排出循环和电化学阻抗光谱。该细胞分别以0.05,0.1,0.2,1和2℃提供1456,1246,918,680和497mA H（-1）的初始放电容量。在100次C / 10循环的C / 10的电流速率下获得96％的Coulombic效率的特定容量保持60％。由于存在导电石墨纸基质，具有高硫负载的细胞表现出良好的库仑效率以及速率能力。

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