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Composite Cathodes Based on Lithium-Iron Phosphate and N-Doped Carbon Materialsстатья
- Авторы: Stenina Irina, Safikanov Danis, Minakova Polina, Novikova Svetlana, Kulova Tatiana, Yaroslavtsev Andrey
- Журнал: Batteries
- Том: 8
- Номер: 12
- Год издания: 2022
- Издательство: MDPI Publishing
- Местоположение издательства: Basel, Switzerland, Switzerland
- Номер статьи: 256
- DOI: 10.3390/batteries8120256
- Аннотация: The effect of different nitrogen-doped carbon additives (carbon coating from polyaniline, N-doped carbon nanotubes, and N-doped carbon nanoparticles) on electrochemical performance of nanocomposites based on the olivine-type LiFePO4 was investigated. Prepared materials were characterized by XRD, SEM, TGA-MS, CHNS-analysis, IR-, Raman, and impedance spectroscopies. Polyaniline deposition on the LiFePO4 precursor with following annealing lead to the formation of a LiFePO4/C nanocomposite with a carbon coating doped with nitrogen. Due to nitrogen atoms presence in carbon coating, the LiFePO4/N-doped carbon nanocomposites showed enhanced conductivity and C-rate capability. The discharge capacities of the synthesized materials in LIBs were close to the theoretical value at 0.1 C and retained high values with increasing current density. At high C-rates, the best results were obtained for a more dispersed LiFePO4/C composite with carbon coating prepared from polyaniline previously in situ deposited on LiFePO4 precursor particles. Its discharge capacity reached 96, 84, 73, and 47 mAh g−1 at 5, 10, 20, and 60 C-rates, respectively.
- Добавил в систему: Кулова Татьяна Львовна