Improvement of the electrochemical performance by partial chemical substitution into the lithium site of titanium phosphate-based electrode materials for lithium-ion batteries: LiNi0.25Ti1.5 Fe0.5(PO4)3
- Srout, Mohammed IMED-Lab, Faculty of Science and Technology- Cadi Ayyad University, Av. A. El Khattabi, P.B.549, Marrakesh, Morocco - University of Fribourg, Department of Chemistry, Chemin du Musee 9, CH-1700, Fribourg, Switzerland
- Kazzi, Mario El Electrochemistry Laboratory, Paul Scherrer Institute, CH-5232, Villigen, PSI, Switzerland
- Ben Youcef, Hicham Mohammed VI Polytechnic University, Lot 660-Hay Moulay Rachid, Ben Guerir, Morocco
- Fromm, Katharina M. University of Fribourg, Department of Chemistry, Chemin du Musee 9, CH-1700, Fribourg, Switzerland
- Saadoune, Ismael IMED-Lab, Faculty of Science and Technology- Cadi Ayyad University, Av. A. El Khattabi, P.B.549, Marrakesh, Morocco - Mohammed VI Polytechnic University, Lot 660-Hay Moulay Rachid, Ben Guerir, Morocco
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15.06.2020
Published in:
- Journal of Power Sources. - 2020, vol. 461, p. 228114
English
Partial lithium substitution with nickel (0.25 of Ni2+ ion) in the previously reported Li1.5Fe0.5Ti1.5(PO4)3/C (LFTP@C) was performed to improve its structural and electrochemical properties. The new LiNi0.25Fe0.5Ti1.5(PO4)3/C (LNFTP@C) material was then tested as electrode for lithium ion batteries. In the voltage window 1.85V–3.0 V vs. Li+/Li, attractive electrochemical performances were obtained, mostly in terms of rate capability performance. At a current rate of 0.1C (6.6 mAg−1), the material delivered a capacity of around 120 mAhg−1, while at 5C, we observed a slight drop of the specific capacity reaching a value of 108 mAhg−1. Long-term cycling performance stability was also tested demonstrating a remarkable capacity decrease during the last 500 cycles. The capacity retention decreased from 94% to 91% after 500 cycles to about 77% and 74% after 1000 cycles at fast current rates of 5C (329.8 mAg−1) and 10C (659.6 mAg−1), respectively. In the wider voltage window, an average specific capacity of around 380 mAhg−1 was attained at a slow current rate of 0.1C.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 328524
- DOI 10.1016/j.jpowsour.2020.228114
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308651
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