Three-dimensional porous graphene microsphere for high-performance anode of lithium ion batteries
| Autor: | Lei Yao, Wang Ying, Yan Kai, Na Li, Chi Hongyan, Tianyi Ji, Caixia Chi, Chen Yang, Daobin Sun, Liang Chen, Sun Fei, Wang Xin, Xiaoxu Liu, Zhang Xiaolan, Zhu Bo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Graphene chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Energy storage 0104 chemical sciences Surfaces Coatings and Films law.invention Anode chemistry Chemical engineering Transmission electron microscopy law Materials Chemistry Lithium 0210 nano-technology Current density |
| Zdroj: | Surface and Coatings Technology. 360:232-237 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2018.12.104 |
| Popis: | A stable graphene anode with high storage Li+ capacity for lithium-ion batteries (LIBs) is to be desired for energy storage. In the present paper, a new scalable method is adopted for preparation of three-dimensional porous graphene microspheres (3DGPM) by a template sacrificing method. The 3DGPM were utilized as an anode for lithium ion batteries (LIBs). The macrostructure of the 3DGPM anode was characterized by the scanning electron microscope, transmission electron microscope and X-ray diffraction. As anode for LIBs, the first discharge/charge capacities of the 3DGPM are 851.1 and 402.4 mAh g−1 at a current density of 0.1 A g−1. The 500th discharge capacity of the 3DGPM anode at a current density of 2 A g−1 is 245.8 mA h g−1. Besides, the 3DGPM exhibit low charge transfer resistance and high Li-ion diffusivities. The porous nanospheres of graphene offer voids for volume expansion and pathways for fast electron transfer during repeated cycling. We believe that the specific micro-/nano-hollow microspherical structure is the main origins of their high electrochemical storage Li performance. |
| Databáze: | OpenAIRE |
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