期刊
ELECTROCHIMICA ACTA
卷 376, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138043
关键词
Noodle-like porous graphitic carbons; Anode materials; Coal tar pitch; Lithium-ion batteries
资金
- National Natural Science Foundation of China [51974110, 52074109]
- Key Scientific and Technological Project of Henan Province [202102210183]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [21HASTIT008]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF180313]
- Coal Green Conversion Outstanding Foreign Scientists Foundation of Henan Province [GZS2020012]
- China Postdoctoral Science Foundation [2017M620304]
- Education Department Science Foundation of Henan Province [19A4400 02]
- Young Key Teacher Training Foundation of Henan Province's Universities [2017GGJS052]
A novel induced growth strategy was used to synthesize noodle-like porous graphitic carbons with unique structure and excellent conductivity, leading to significantly improved electrochemical performance of LIB anodes. By optimizing the microstructure design, the cycling stability and rate capability of LIB anodes were enhanced.
Porous graphitic carbons are amongst the most attracted anode materials for lithium-ion batteries (LIBs) mainly because of their well-developed porous structure combined with desirable electrical conductivity. In this work, a novel induced growth strategy is introduced to synthesize noodle-like porous graphitic carbons (NPGCs) from low-cost coal tar pitch (CTP) using magnesium citrate as inducer and template. The as-prepared NPGCs have unique noodle-like carbon architecture consisting of cross-linked carbon chains with large specific surface area (similar to 888.1 m(-2) g(-1)), high pore volume (similar to 2.112 cm(3) g(-1)) as well as desirable conductivity, and possess hierarchically porous structure containing favorable distribution of micro-, meso-and macropore and appropriate level of oxygen and nitrogen heteroatom doping. Due to these synergistic microstructure characteristics, the LIB anodes based on NPGCs exhibit remarkably improved electrochemical performance with an average reversible capacity (1157 mAh g(-1) at 0.05 A g(-1)), superior rate capability (510 mAh g(-1) at 2.0 A g(-1)) and an outstanding long-term cycling performance (95.3% capacity retention after 200 charge-discharge cycles). This work provides a novel strategy for cost-effective fabrication of more exciting microstructures of NPGCs with adjustable hierarchical porous structure and favorable conductivity from cheap carbon sources for anode materials in high-performance LIBs. (C) 2021 Elsevier Ltd. All rights reserved.
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