LiNiO_2, Li_(1+x)NiO_2(x=0.00-0.05) and LiAl_yNi_(1-y)O_2 (y=0.00-0.3) powers were synthesized using a sol-gel method. To synthesize LiNiO_2 with a good electrochemical performance, the experiments were carried out as function of the molar ratio of ad...
LiNiO_2, Li_(1+x)NiO_2(x=0.00-0.05) and LiAl_yNi_(1-y)O_2 (y=0.00-0.3) powers were synthesized using a sol-gel method. To synthesize LiNiO_2 with a good electrochemical performance, the experiments were carried out as function of the molar ratio of adipic acid to total metal ions, excess Li content, and Al doping. The synthesized LiNiO_2 powders showed a good crystal quality when the molar ratio of adipic acid to total metal ions was 1.0. The analysis of gas composition evolved during the decomposition of gel precursors revealed that oxygen played an important role in improving the crystal quality of LiNiO_2 powders. All the prepared Li_(1+x)NiO_2 powders had a typical LiNiO_2 layered structure, but the electrochemical performance was degraded with the increasing the lithium content. Al-doped LiAl_yNi_(1-y)O_2 powdwers were better than LiNiO_2 powders in cyclicality though it showed a low initial discharge capacity. The Al doped LiAl_yNi_(1-y)O_2 powders presented a good electrochemical performance even at higher temperatures.