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A nitrogen-doped carbon-coated lithium iron manganese phosphate (LMFP) composite (N-C@LMFP) was synthesized from ball-milling glucose, as carbon source, and urea, as nitrogen source, with LMFP precursor, and characterized by XRD, Raman spectroscopy, XPS, and TEM. The effect of nitrogen doping content (that is, the percentage of the amount of substance of nitrogen in urea accounting for that of carbon in glucose, the same below) on the electrochemical performance of N-C@LMFP electrode was evaluated by cyclic voltammetry and electrochemical impedance spectroscopy, while the mechanism through which the nitrogen-doped carbon layer enhanced the rate capability of LMFP cathode material was also investigated. The results indicated that the 5% N-C@LMFP electrode with 5% nitrogen doping content exhibited the best electrochemical performance, achieving a discharge specific capacity of 133.6 mA·h/g. Even under a high discharge rate of 5 C, the specific capacity remained at 98.7 mA·h/g, significantly outperforming that of the undoped C@LMFP. Furthermore, after 300 cycles at 1 C, the 5% N-C@LMFP electrode exhibited a capacity retention rate of 95.3%, surpassing that of C@LMFP (93.9%), demonstrating enhanced cycling stability. The improved performance was attributed to the strong interaction between the nitrogen-doped carbon layer and the LMFP matrix. Specifically, chemical bonds such as N—Mn and N—Fe formed at the interface effectively reduced the charge transfer resistance and enhanced the lithium ion diffusion coefficient, thereby improving both structural stability and ion transport kinetics.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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