Aluminum-doped lithium iron phosphate was synthesized with a modified sol-gel process. The sol-gel derived cathodes show much higher conductivity than those prepared by a solid-state method. The conductivity is 8 × 10 -2 S cm-1 for the Al-doped LiFePO4/carbon composite powders synthesized at 850 °C for 2 h, as determined using AC impedance spectroscopy. The electrodes consisting of the Al-doped LiFePO 4/carbon composite powders were fabricated for the electrochemical characterization and showed a specific capacity of about 150 mAh g-1 at C/40 rate. Not only the conductivity of the crystal lattice but also the conductivity of the grain boundary is enhanced for the nano-sized Al-doped LiFePO4/carbon composite powders.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering