Enhanced energy storage of alkali (Li, Na) titanates by sucrose carbonization

CHAUQUE, S.; OLIVA, F. Y.; LENER, G.; CÁMARA, O. R.

JOURNAL OF SOLID STATE ELECTROCHEMISTRY (PRINT)

SPRINGER

Año: 2020 vol. 24 p. 1017 - 1017

1432-8488

n this work, a simple and effective synthesis procedure was performed in order to prepare hybrid alkali titanate materials, asnegative electrodes for lithium-ion battery applications. Lithium titanate Li4Ti5O12 (LTO) and sodium titanates Na2Ti3O7(NTO237) and Na2Ti6O13 (NTO2613) compounds were synthesized through a solid-state method; then a carbon coating wasperformed using sucrose impregnation followed by a dehydration step with strong acid medium, and finally calcined at hightemperature. XRD and Raman spectroscopy analysis of the composites indicated that the strong acid medium in the carbonizationstep affects the titanate structure. A calcination temperature at 700 °C proved to be adequate to obtain the LTO/C material withoutsignificant changes and with a homogeneous carbon coating, so it was used to obtain further the hybrids NTO237/C and NTO2613/C materials. The carbon coating improved the good behavior obtained before in bare LTO compound about specific capacity forelectric char