Selection of nitrogen source and PVP-assisted sol-gel method synthesis of LiFe0.65Mn0.35PO4/C as cathode material for lithium ion batteries
| Autor: | Chenyu Du, Yanzhen He, Lingzhi Zhu, Shunpan Qiao, Xu Yang, Enshan Han, Jiabao Liu, Lina Li |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polyvinylpyrrolidone General Chemical Engineering Composite number General Engineering General Physics and Astronomy chemistry.chemical_element Electrochemistry Dielectric spectroscopy chemistry X-ray photoelectron spectroscopy Chemical engineering medicine General Materials Science Lithium Porosity medicine.drug Sol-gel |
| Zdroj: | Ionics. 26:5405-5415 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-020-03679-2 |
| Popis: | LiFe0.65Mn0.35PO4/C composites with porous structure have been successfully prepared through a facile sol-gel method. After comparison, the non-ionic surfactant polyvinylpyrrolidone (PVP) was selected as the best nitrogen source. The structures, morphologies, and electrochemical performances of the composites were characterized by XRD, XPS, SEM, charge/discharge tests, and electrochemical impedance spectroscopy. The LiFe0.65Mn0.35PO4/C composite which is decorated with suitable amount of PVP has higher discharge capacity and more stable cycling performance. The results show that in the voltage range of 2.5–4.5 V, the discharge capacities of 148, 149.3, 139.3, and 130 mAhg−1 in the amount of 20% PVP could be delivered at 0.1, 0.2, 0.5, and 1 C, respectively. A remarkable rate capability was exhibited with 87.84% capacity retention at 1 C rate. The composites owned an optimum performance with a high rate capacity of 146.8 mAhg−1 when it returns to 0.1 C after 40 cycles of discharge at different rates. |
| Databáze: | OpenAIRE |
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