In the aim to obtain a new powder able to substitute oxide intensively used as a material for the positive electrode in the batteries Lithium-ion, the LiNi0.43Mn0.43Co0.13O2 material was synthesized by sol-gel method and characterized by XRD, RAMAN and TEM. The composition of our LiNi0.43Mn0.43Co0.13O2 oxide was checked by ICP analysis. The Rietveld refinement showed a very weak mixing cation disorder, probably due to the presence of nickel excess in this material. Electrochemical performances of LiNi0.43Mn0.43Co0.13O2 oxide were tested using this material as positive electrode in a battery of lithium.