We report in this paper on the use of Complex Sol-Gel Process (CSCP) to synthesize LiNixCo1-xO2 (x= 0, 0-25, 0.5, 0.75, 1) compounds. The starting solutions (Sols) were prepared from xNi 2+; 1-x)Co2+ acetates- acorbic acid (hereafter reported as ASC) aqueous solutions by alkalizing them with LiOH and ammonium hydroxide. To prevent the precipitation of Ni species it has been necessary to increase the ASC concentration of the precursors solutions. Regular sols were concentrated to 1/3 of their initial volume and dried slowly up to 170°C. Further heating results in violent self-ignition around 400°C. Temperature of this effect does not depend on the composition of precursors and theirs specific surface area, but rather on catalytic action of Ni or/and Co. Thermal transformation of the LiNixCo1-xO2 gels to solids (studied by TG, DTA, XRD and IR) proceeds with formation of carbonates, except for LiCoO 2. The carbonate impurities, whose content has been found to increase as Ni concentration increases, can not be practically removed even at very high temperatures due to decomposition of the layered oxides. The preliminary electrochemical test for these materials show that only the spinels without carbonates impurities exhibit good properties. Here we propose a new procedure aimed to remove completely the carbonates impurities from these layered oxides samples.
|Pages (from-to)||39 - 44|
|Number of pages||6|
|Journal||Journal of New Materials for Electrochemical Systems|
|Publication status||Published - Jan 2003|
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Deptula, A., Olczak, T., Lada, W., Croce, F., D'Epifanio, A., Di Bartolomeo, A., & Brignocchi, A. (2003). Some comments on the synthesis of LiNi. Journal of New Materials for Electrochemical Systems, 6(1), 39 - 44.