题目： | Liquid Phase Exfoliated MoS2 Nanosheets Percolated with Carbon Nanotubes for High Volumetric/Areal Capacity Sodium-Ion Batteries |
作者： | Yuping Liu,1# Xiaoyun He,2# Damian Hanlon2, Andrew Harvey2, Jonathan N. Coleman2* and Yanguang Li1** |
单位： | 1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China 2School of Physics, CRANN and AMBER Centers, Trinity College Dublin, Dublin 2, Ireland |
摘要： | The search for high capacity, low-cost electrode materials for sodium-ion batteries is a significant challenge in energy research. Among the many potential candidates, layered compounds such as MoS2 have attracted increasing attention. However, such materials have not yet fulfilled their true potential. Here, we show that networks of liquid phase exfoliated MoS2 nanosheets, reinforced with 20 wt% single-wall carbon nanotubes (SWNTs) can be formed into sodium-ion battery electrodes with large gravimetric, volumetric and areal capacity. The MoS2/SWNTs composite films are highly porous, electrically conductive and mechanically robust due to its percolating carbon nanotube network. When directly employed as the working electrode, they exhibit specific capacity of >400 mAh/g and volumetric capacity of ~650 mAh/cm3. Their mechanical stability allows them to be processed into free-standing films with tunable thickness up to ～100 μm, corresponding to an areal loading of 15 mg/cm2. Their high electrical conductivity allows the high volumetric capacity to be retained, even at high thickness, resulting in state-of-the art areal capacities of >6.0 mAh/cm2. Such values are competitive with their lithium-ion counterparts. |
影响因子： | 13.334 |
分区情况： | 1区 |
链接： | http://pubs.acs.org/doi/abs/10.1021/acsnano.6b04577 责任编辑：向丹婷 |