Effect of Mg+2 and Bi+3 co-doping on structural and electrochemical properties of lithium titanium oxide for use as anode material in lithium-ion battery

Naila Firdous, Nasima Arshad*, Nazan Muzaffar, Poul Norby

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study describes the effect of magnesium and bismuth co-doping on the structure and electrochemical properties of Li4Ti5O12 as potential negative electrode materials for lithium-ion batteries. The substituted spinel cubic Li4-x/2 MgxTi5-x/2BixO12 (X = 0, 0.05, 0.1) (LTO-MB) materials were prepared through facile ball milling assisted solid-state method. Structural analysis revealed that LTO-MB materials have space group Fd3m. Basic structure and phase composition of Li4Ti5O12 does not changed by Mg-Bi co-doping, lattice parameters are slightly increased. No remarkable change in the morphology was observed in the co-doped materials under the magnification of 2 μm. Significant improvement in the rate capability of LTO-MB materials can be observed upon Mg-Bi co-doping. Both co-doped compositions (LTO-MB-05, LTO-MB-1) have shown greater electrochemical performance as compared to pristine LTO-MB-0. The improvement in the electrochemical performance can be attributed to the mechanism by which co-doping increased conductivity and lithium diffusion coefficient. LTO-MB-05 exhibited specific capacity of ~200 mAhg−1 at 0.1C which is greater than LTO-MB-1(180 mAhg−1) and pristine LTO-MB-0 (165 mAhg−1) at same C-rate. Similarly, the higher value of Li+ diffusion constant (4.77 × 10−12 cm2 s−1) and lower charge transfer resistance (18.77 Ω) together with enhanced discharge capacity are proving LTO-MB-05 a good anode candidate for commercialization.

Original languageEnglish
Article number114515
JournalJournal of Electroanalytical Chemistry
Volume876
Number of pages8
ISSN1572-6657
DOIs
Publication statusPublished - 2020

Keywords

  • Coulombic efficiency
  • Cyclic stability
  • Enhanced electronic conductivity
  • Excellent specific capacity
  • Li MgTiBiO
  • Li ion battery anode

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