Bibliographic Details
| Title: |
Effect of Al Addition on Formation of Layer-Structured LiNiO2 |
| Authors: |
Lin, Shih-Pin1, Fung, Kuan-Zong, Hon, Yi-Ming1, Hon, Min-Hsiung1 |
| Source: |
Journal of Solid State Chemistry. Aug2002, Vol. 167 Issue 1, p97. 10p. |
| Subjects: |
Complex compounds, Dynamics, Education |
| Abstract: |
Kinetics and formation mechanism of undoped and Al-doped LiNiO2 from Li2CO3 and NiO were investigated in this study. Without the addition of Al ions, sluggish kinetics for the formation of undoped LiNiO2 was observed. The fraction of undoped LiNiO2 reached 50% after Li2CO3 and NiO reacted at 700°C for 150 min. With the addition of 25% of Al ion, the fraction of Al-doped LiNiO2 reached 50% within 60 min at 700°C. The analysis of kinetics study indicates that the formation of undoped and Al-doped LiNiO2 is a diffusion-controlled process. Furthermore, the rate constant determined from Jander model {[1−(1−α)1/3]2=Kt} was significantly enhanced by the addition of Al. The activation energy for the formation of LiNiO2 drastically decreased from 190 kJ/mole (undoped reaction) to 83 kJ/mole when 25% Al was added. The enhancement of LiNiO2 formation by Al doping is attributed to the structure resemblance between αLiAlO2 and LiNiO2. αLiAlO2 acts as the seeding material which provides nucleation sites for the growth of LiNiO2. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
