Facile and cost-effective manipulation of hierarchical carbon nanosheets for pseudocapacitive lithium/potassium storage
2020
Peng, Tingyue | Tan, Zhonghao | Zhang, Mengdi | Li, Linqing | Wang, Yixian | Guan, Lu | Tan, Xiaojie | Pan, Lei | Fang, Haiqiu | Wu, Mingbo
The rising demand for high-performance energy storage devices calls for cost-effective electrode materials with large working potential windows, high specific capacities, and rapid rate capability. Herein, we propose a facile molten-salt-mediated production of ultrathin carbon nanosheets with tunable nitrogen doping using low-cost precursors including asphalt and melamine. The as-obtained nitrogen doped slim carbon nanosheets (NSCN) constructed through this easy and effective in-situ method offer both high specific capacity and excellent cycling stability. Specifically, a specific capacity of 848 mAh g⁻¹ after 800 cycles at 1 A g⁻¹ and 214 mAh g⁻¹ after 1500 cycles at 1 A g⁻¹ were achieved for lithium and potassium storage, respectively. The excellent electrochemical performances benefit from the synergistic effect of structural merits including ultra-thin nanosheet, nitrogen doping, high disorder degree and large specific surface area. Meanwhile, it also provides an avenue for realizing the value-added utilization of heavy oil in an alternative field.
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