3D few-layered MoS2/graphene hybrid aerogels on carbon fiber papers: A free-standing electrode for high-performance lithium/sodium-ion batteries

摘要

In this work, we developed a drop coating-freeze drying-thermal reduction method to prepare ultrathin MoS2 nanosheets/graphene hybrid aerogels on a carbon fiber paper substrate (MoS2/GS-A), which is simpler, more efficient and easier to amplify than conventional hydrothermal or chemical vapor deposition (CVD) methods. More importantly, the preparation of aerogels and electrode is completed simultaneously, which not only greatly simplifies the traditional electrode preparation but also avoids the damage of aerogel structure caused by grinding, so as to construct a long-range three-dimensional connected conductive network and porous structure at the electrode level. Benefitting from the superb electronic and ionic transport kinetics across the whole electrode, the electrode delivered an ultra large capacity of 1709 mAh g(-1) at 0.2 A g(-1) and remarkable rate capability of 1384 and 865 mAh g(-1) at current densities of 0.6 and 1.0 A g(-1) in lithium-ion batteries. Moreover, the electrode also exhibited outstanding sodium-ion storage capacity, and a stable charge capacity of 850 mAh g(-1) was retained after 100 cycles under 0.1 A g(-1).