Engineering layer structure of MoS2-graphene composites with robust and fast lithium storage for high-performance Li-ion capacitors
| Autor: | Li Zhang, Yabin Zhang, Shijie Wang, Jianmin Ma, Yaojun Cai, Rutao Wang, Dongdong Jin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Renewable Energy Sustainability and the Environment Graphene Energy Engineering and Power Technology Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage 0104 chemical sciences Anode law.invention chemistry.chemical_compound Capacitor chemistry Amorphous carbon law General Materials Science Graphite 0210 nano-technology Molybdenum disulfide |
| Zdroj: | Energy Storage Materials. 9:195-205 |
| ISSN: | 2405-8297 |
| DOI: | 10.1016/j.ensm.2017.07.013 |
| Popis: | Two dimensional layered MoS 2 has demonstrated great promise as an ideal alternative to graphite-based anodes for hybrid Li-ion capacitors and Li-ion batteries. Research effort on this material has focused mainly on synthesizing highly nanostructured MoS 2 that allows reducing the dimensions into nanoscale to cross over the sluggish kinetics of Li-ion charge storage. Herein, we engineer the layer structure of MoS 2 to preferentially expand the interlayer distance to increase atomic interface contact/interaction by successfully inserting amorphous carbon layer into adjacent MoS 2 monolayers. This interlayer modified MoS 2 is demonstrated to have the predominantly pseudocapacitive characteristics and can get further gains in Li-ion storage properties through incorporating reduced graphene oxide (RGO). Thus, a novel hybrid Li-ion capacitor is fabricated by employing this MoS 2 -RGO composite as the anode and activated carbon as the cathode, which exhibits an ultrahigh specific energy density of 188 Wh kg -1 at 200 W kg -1 and remains 45.3 Wh kg -1 even at a high specific power density of 40,000 W kg -1 as well as long cycle life. This work shows that engineering interlayer structure and introducing conductive graphene can significantly impact the Li-ion storage properties, enabling new opportunities for designing newly advanced MoS 2 anodes for next-generation energy storage devices. |
| Databáze: | OpenAIRE |
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