Construction of high performance N-doped carbon coated LiMn0.8Fe0.2PO4 nanocrystal cathode for lithium-ion batteries
| Autor: | Shaochang Han, Run-zhen Fan, Zhuang Hu, Changling Fan, Jin-shui Liu, Taotao Zeng, Weihua Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Doping Metals and Alloys chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering Nanocrystal Mechanics of Materials law Materials Chemistry Lithium Chemical stability Pyrolytic carbon 0210 nano-technology Melamine |
| Zdroj: | Journal of Alloys and Compounds. 876:160090 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.160090 |
| Popis: | N-doped carbon coated LiMn0.8Fe0.2PO4 nanocrystal for lithium-ion batteries was prepared by a facile solvothermal method. The doping effect of nitrogen is regulated by altering the addition amount of nitrogen source melamine. Result shows that the introduction of N atoms does not change the crystal structure of LiMn0.8Fe0.2PO4/C. The ‒NH2 functional groups in melamine can react with the ‒OH groups in pyrolytic carbon generated by the pre-sintering of sucrose. Then, multiple nanosheets in LMFP-0 are combined together and the morphology of LiMn0.8Fe0.2PO4/C is transformed to nano particle-like in LMFP-7. The doped nitrogen in the forms of pyridinic, pyrrolic and graphitic N are derived from the combination of pyrolytic carbon and melamine, which can generate active defective sites and improve the electronic conductivity and diffusion rate of lithium ions. Sample LMFP-7 delivers the best electrochemical performance with a capacity of 154.7, 144.2 and 110.0 mA h g−1 at 0.1, 1 and 5 C, respectively. The LiMn0.8Fe0.2PO4/C cathode exhibits good electrochemical reversibility, low charge transfer resistance (46.9 Ω) and high diffusion coefficient (1.35 × 10−13 cm2 s−1). It also delivers excellent cyclic performance, structural stability and chemical stability. |
| Databáze: | OpenAIRE |
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