Li0.5Ni0.5Ti1.5Fe0.5(PO4)3/C electrode material for lithium ion batteries exhibiting faster kinetics and enhanced stability

Srout, Mohammed; Kwon, Nam Hee; Ben Youcef, Hicham; Semlal, Nawal; Fromm, Katharina M.; Saadoune, Ismael

doi:10.1021/acsami.0c00712

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Li0.5Ni0.5Ti1.5Fe0.5(PO4)3/C electrode material for lithium ion batteries exhibiting faster kinetics and enhanced stability

Srout, Mohammed IMED-Lab., Cadi Ayyad University (UCA), Av. A. El Khattabi, P.B. 549, 40000 Marrakesh, Morocco - Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
Kwon, Nam Hee Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
Ben Youcef, Hicham Mohammed VI Polytechnic University, Lot 660-Hay Moulay Rachid, 43150 Ben Guerir, Morocco
Semlal, Nawal OCP, Innovation, BP. 118, 24000 El Jadida, Morocco
Fromm, Katharina M. Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
Saadoune, Ismael IMED-Lab., Cadi Ayyad University (UCA), Av. A. El Khattabi, P.B. 549, 40000 Marrakesh, Morocco - Mohammed VI Polytechnic University, Lot 660-Hay Moulay Rachid, 43150 Ben Guerir, Morocco

22.04.2020

Published in:

ACS Applied Materials & Interfaces. - 2020, vol. 12, no. 16, p. 18496–18503

English Natrium super ionic conductor (NASICON) materials providing attractive properties such as high ionic conductivity and good structural stability are considered as very promising materials for use as electrodes for lithium- and sodium-ion batteries. Herein, a new high-performance electrode material, Li0.5Ni0.5Ti1.5Fe0.5(PO4)3/C, was synthesized via the sol–gel method and was electrochemically tested as an anode for lithium ion batteries, providing enhanced electrochemical performance as a result of nickel substitution into the lithium site in the LiTi2(PO4)3 family of materials. The synthesized material showed good ionic conductivity, excellent structural stability, stable long-term cycling performance, and improved high rate cycling performance compared to LiTi2(PO4)3. The Li0.5Ni0.5Ti1.5Fe0.5(PO4)3/C electrode delivered reversible capacities of about 93 and 68% of its theoretical one at current rates of 0.1 C (6.42 mA·g–1) after 100 cycles and 5 C (320.93 mA·g–1) after 1000 cycles, respectively. Theoretically, three Li+ ions can be inserted into the vacancies of the Li0.5Ni0.5Ti1.5Fe0.5(PO4)3/C structure. However, when the electrode is discharged to 0.5 V, more than three Li+ ions are inserted into the NASICON structure, leading to its structural transformation, and thus to an irreversible electrochemical behavior after the first discharge process.

Faculty

Faculté des sciences et de médecine

Department

Département de Chimie

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