Estudio del efecto de dopar a la espinela lithium manganate con neodymium y cesium para usarlo como catodo en baterias de ion de litio.

摘要

In this thesis work the effect of doping LiMn2O4 spinel with Nd and Ce ions to enhance its electrochemical properties when used of in Ion-lithium batteries is reported.; The pure spinel phase LiMn1.99M0.01O4, with (M = Nd, Ce), was synthesized by the route of chemical solution, and evaluated as a cathode material inside a HS Test Cell. The lithium is used as anode, and as electrolyte 1 M of lithio-hexaflurophosphate (LiPF 6) diluted in dimethyl carbonate (DMC) and ethylene carbonate (EC) in a weight ratio of (1:1).; The phase of the spinel structure in its pure form was characterized by the techniques of x-rays diffraction (XRD), and sweeping electronic microscopy of (SEM), with which the good morphology and crystallization this phase was corroborated.; The presence of both peaks (oxidation-reduction) in the voltammogram cycle reveals the extraction of Li+ and its incorporation in the spinel structure. The characteristics of a good development of the charge-discharge were carried out in the range of 3.0 to 4.8 volts.; With the initial load for the case of LiMn1.99Nd0.01 O4 was around 116.4 mAh/g and after 25 cycles the material had a retention of 88.43% of the initial capacity on the other hand for LiMn 1.99Ce0.01O4 it was around de146 mAh/g but after 25 cycles the material had a retention of hardly 54.6% of the initial capacity.