期刊
MATERIALS
卷 15, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/ma15144738
关键词
lithium-ion batteries; LiFePO4; N-doped; core-shell structure
类别
资金
- Key Research and Development Program of Shaanxi [2021GXLH-Z-079]
- National Natural Science Foundation of China [52101096, 52176162, 22008190]
- China Postdoctoral Science Foundation [2019TQ0248, 2019M663735]
LiFePO4/N-doped C composites with core-shell structures were synthesized using a solvothermal method, with CTAB and glucose as nitrogen and carbon sources. The presence of N atoms in pyridinic and graphitic forms in the carbon of LiFePO4/N-doped C enhanced the cathode's capacity performance. The electrochemical tests revealed a synergistic effect between N-doping and core-shell structure in improving the electrochemical performance of the cathode.
LiFePO4/N-doped C composites with core-shell structures were synthesized by a convenient solvothermal method. Cetyltrimethylammonium bromide (CTAB) and glucose were used as nitrogen and carbon sources, respectively. The growth of LiFePO4 nanocrystals was regulated by CTAB, resulting in an average particle size of 143 nm for the LiFePO4/N-doped C. The N atoms existed in the carbon of LiFePO4/N-doped C in the form of pyridinic N and graphitic N. The LiFePO4/N-doped C composites delivered discharge specific capacities of 160.7 mAh center dot g(-1) (0.1 C), 128.4 mAh center dot g(-1) (5 C), and 115.8 mAh center dot g(-1) (10 C). Meanwhile, no capacity attenuation was found after 100 electrochemical cycles at 1 C. N-doping enhanced the capacity performance of the LiFePO4/C cathode, while the core-shell structure enhanced the cycle performance of the cathode. The electrochemical test data showed a synergistic effect between N-doping and core-shell structure on the enhancement of the electrochemical performance of the LiFePO4/C cathode.
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