CARiM’s researcher Prof. Dr. Violeta Koleva had presented results and achievements on the project at the international conference “FUTURE MATERIALS 2023: 4th International Conference on Materials Science & Nanotechnology”, 23.10.2023 – 27.10.2023, Valencia, Spain.
Ce-modified NaFePO4 as electrode material for sodium ion batteries
Violeta Koleva, Sonya Harizanova, Trajche Tushev and Radostina Stoyanova
Abstract: The commercialization of the Na-ion batteries as cheaper alternative to Li-ion batteries is still a great challenge and one of the important issues is related to the choice of the most suitable electrode materials. Low cost per energy density, high safety, reliability, and sustainability are key requirements for the electrode materials. Among sodium intercalation compounds, the incorporation of a cheap and widely available redox element such as iron in the stable phosphate framework could largely meet the economic, safety and environmental requirements. The activation of both cationic and anionic redox reactions in the intercalation type electrodes is an effective way to double the energy density of lithium- and sodium-ion batteries. More recently, the use of oxygen storage materials such as CeO2 for stabilization of oxygen redox activity has been found to increase drastically the reversible capacity of P3- Na2/3Ni1/2Mn1/2O2. Moreover, first principle calculations have shown that anionic (O2- ) redox processes in NaFePO4 are also visible. Inspired by these data this study is focused on the Ce modified NaFePO4 as cathode material. To ensure a homogeneous Ce distribution, Ce acetate (2 and 5 wt.%) is introduced during the preparation of the phosphate precursor. The electrochemical performance of Ce-modified NaFePO4 is tested in galvanostatic and potentiostatic regimes in Na- and Li-half cells. The cycling stability and rate capability are studied at 20 and 40 C. Phase stability during the cycling is monitored by ex-situ techniques.
Acknowledgements: The authors thank to the project CARiM (NSP Vihren, КП-06-ДB-6).
The authors from CARiM’s Research Team are bolded.
VIHREN-CARiM 2019 