1
|
Gao S, Liu L, Mao F, Zhang Z, Pan K, Zhou Z. Coal-based ultrathin N-doped carbon nanosheets synthesized by molten-salt method for high-performance lithium-ion batteries. NANOTECHNOLOGY 2022; 33:425401. [PMID: 35803126 DOI: 10.1088/1361-6528/ac7fa5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 07/08/2022] [Indexed: 06/15/2023]
Abstract
Coal is a typical fossil fuel and it is also a natural carbon material, therefore, converting it to functional carbon materials is an effective way to enhance the economic advantages of coal. Here, ultrathin N-doped carbon nanosheets were prepared from low-cost coal via a handy and green molten-salt method, which shown excellent performance for lithium-ion batteries (LIBs). The formation mechanism of ultrathin nanosheets was studied in detail. The eutectic molten salts possess low melting points and become a strong polar solvent at the calcined temperature, making the acidified coal miscible with them in very homogeneously state. Therefore, they can play a gigantic role inin situpore-forming during the carbonization and induce the formation of ultrathin nanosheets due to the salt ions. Simultaneously, the ultrathin N-doped carbon nanosheets with rich defects and controllable surface area was smoothly prepared without any more complex process while revealing brilliant electrochemical performance due to rich ion diffusion pathways. It delivers reversible capacity of 727.0 mAh g-1at 0.2 A g-1after 150 cycles. Thus, the molten-salt method broadens the avenue to construct porous carbon materials with tailor-made morphologies. Equally important, this approach provides a step toward the sustainable materials design and chemical science in the future.
Collapse
Affiliation(s)
- Shasha Gao
- Key Laboratory of Microelectronics and Energy of Henan Province, Department of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People's Republic of China
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Lang Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
| | - Feifei Mao
- Key Laboratory of Microelectronics and Energy of Henan Province, Department of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Zhang Zhang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Kecheng Pan
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Zhen Zhou
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
- School of Materials Science and Engineering Institute of New Energy Material Chemistry, Renewable Energy Conversion and Storage Center (ReCast), Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University, Tianjin 300350, People's Republic of China
| |
Collapse
|