Reference : Influence of the synthesis method on the electrochemical properties of the Li4Ti5O12 ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Influence of the synthesis method on the electrochemical properties of the Li4Ti5O12 spinel in Li-half and Li-ion full-cells. A systematic comparison
Mahmoud, Abdelfattah mailto [Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT >]
Amarilla, José Manuel [> >]
Lasri, Karima [> >]
Saadoune, Ismael [> >]
Electrochimica Acta
Pergamon Press - An Imprint of Elsevier Science
163 - 172
Yes (verified by ORBi)
[en] Lithium battery ; Anode material ; Lithium titanium oxide ; LiTiO spinel ; Li-ion full-cell
[en] To study the influence of the synthesis method on the electrochemical performances of the Li4Ti5O12 spinel (LTO) several samples have been prepared by three different synthesis procedures (sol–gel, self-combustion and solid-state). The use of the same Ti-source (TiCl4) and strictly the same experimental conditions has allowed performing a meaningful comparison analysis. The structural characterization by X-ray diffraction shown that cubic spinels, with similar cell parameter (ac ∼ 8.35 Å), were obtained for the three methods. The purity of the samples prepared by sol–gel (LTO-SG) and combustion (LTO-CB) was very high, >96%. FE-SEM studies revealed that the particle size (ps) and the particle aggregation notably changed with the synthesis method. The ps-values grow up from 301 nm for LTO-SG to 1580 nm for the sample synthesized by solid-state (LTO-SS). The comparison of the galvanostatic results permitted to demonstrate that LTO-electrochemical performances (capacity, cycleability and rate capability) strongly depend on the synthesis method. The LTO-SG sample exhibited the best electrochemical performances, with a discharge capacity of 146 mAh/g at 0.2 C, elevated cycleability and the highest rate capability. New formulation Li-ion full-cells with the synthesized LTO-samples as anode and LiCo2/3Ni1/6Mn1/6O2 as cathode have been assembled and studied. They have remarkable cycling performances with capacity retentions >90% after 50 cycles.
AECID (MAEC-AECI fellowship)

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