Li0.5Ni0.5Ti1.5Fe0.5(PO4)3/C Electrode Material for Lithium Ion Batteries Exhibiting Faster Kinetics and Enhanced Stability


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Publication Details

Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: Srout M, Kwon NH, Youcef HB, Semlal N, Fromm KM, Saadoune I

Publication year: 2020

Journal: {ACS} Applied Materials {&} Interfaces

Volume number: 12

Issue number: 16

Start page: 18496

End page: 18503

Number of pages: 8

URL: https://doi.org/10.1021/acsami.0c00712

Languages: English (EN-GB)


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Abstract

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


Keywords

fast kinetics, high rate capability, lithium-ion batteries, NaSICON, Phosphate


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Last updated on 2022-17-01 at 23:16