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Title: Structural and Electrochemical Characteristics of Ca-Doped “Flower-like” Li4Ti5O12 Motifs as High-Rate Anode Materials for Lithium-Ion Batteries

Journal Article · · Chemistry of Materials

Doped motifs offer an intriguing structural pathway toward improving conductivity for battery applications. Specifically, Ca-doped, three-dimensional “flower-like” Li4–xCaxTi5O12 (“x” = 0, 0.1, 0.15, and 0.2) micrometer-scale spheres have been successfully prepared for the first time using a simple and reproducible hydrothermal reaction followed by a short calcination process. The products were experimentally characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) mapping, inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge testing. Calcium dopant ions were shown to be uniformly distributed within the LTO structure without altering the underlying “flower-like” morphology. The largest lattice expansion and the highest Ti3+ ratios were noted with XRD and XPS, respectively, whereas increased charge transfer conductivity and decreased Li+-ion diffusion coefficients were displayed in EIS for the Li4–xCaxTi5O12 (“x” = 0.2) sample. The “x” = 0.2 sample yielded a higher rate capability, an excellent reversibility, and a superior cycling stability, delivering 151 and 143 mAh/g under discharge rates of 20C and 40C at cycles 60 and 70, respectively. In addition, a high cycling stability was demonstrated with a capacity retention of 92% after 300 cycles at a very high discharge rate of 20C. In addition, first-principles calculations based on density functional theory (DFT) were conducted with the goal of further elucidating and understanding the nature of the doping mechanism in this study. The DFT calculations not only determined the structure of the Ca-doped Li4Ti5O12, which was found to be in accordance with the experimentally measured XPD pattern, but also yielded valuable insights into the doping-induced effect on both the atomic and electronic structures of Li4Ti5O12.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2M)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1425064
Report Number(s):
BNL-200081-2018-JAAM; TRN: US1802025
Journal Information:
Chemistry of Materials, Vol. 30, Issue 3; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 61 works
Citation information provided by
Web of Science

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  • Setiawan, D.; Subhan, A.; Saptari, S. A.
  • INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2016 (ISCPMS 2016): Proceedings of the 2nd International Symposium on Current Progress in Mathematics and Sciences 2016, AIP Conference Proceedings https://doi.org/10.1063/1.4991177
conference January 2017
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Cited By (9)

Crystallized lithium titanate nanosheets prepared via spark plasma sintering for ultra-high rate lithium ion batteries journal January 2019
Hollow-sphere iron oxides exhibiting enhanced cycling performance as lithium-ion battery anodes journal January 2019
Systematic evaluation of lithium-excess polyanionic compounds as multi-electron reaction cathodes journal January 2019
Li 4 Ti 5 O 12 quantum dot decorated carbon frameworks from carbon dots for fast lithium ion storage journal January 2019
Ionothermal synthesis of a photoelectroactive titanophosphite with a three-dimensional open-framework journal January 2019
Electrochemical performance of ZnO-coated Li 4 Ti 5 O 12 composite electrodes for lithium-ion batteries with the voltage ranging from 3 to 0.01 V journal October 2018
Rationalization of Diversity in Spinel MgFe 2 O 4 Surfaces journal September 2019
Advanced composites of complex Ti-based oxides as anode materials for lithium-ion batteries journal May 2018
Cr-doped lithium titanate nanocrystals as Mg ion insertion materials for Mg batteries journal January 2019

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