The structure and electrochemical properties of LiAlyCo1-yO2 cathodes for Li rechargeable batteries have been closely examined by neutron diffraction, X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), differential scanning calorimetry (DSC), and electrochemical methods. Neutron diffraction patterns and Co K-edge X-ray absorption near-edge structure (XANES) spectra of LiAl0.25Co0.75O2 revealed that aluminum and cobalt ions were statistically distributed in octahedral 3b sites of the ordered α-NaFeO2 structure. The DSC scan of Li0.5Al0.25Co0.75O2 showed an increase in the peak temperature and reduction in the exothermic peak compared to those of Li0.5CoO2, and it indicates that Al-doped LiCoO2 shows the good thermal stability of the cathode and reduction of the heat of reaction.
Bibliographical noteFunding Information:
The authors are grateful to authorities at the Pohang light source (PLS) for X-ray absorption spectroscopic measurements. This work was supported by the Brain Korea 21 project and the neutron powder diffraction experiment was carried out using HRPD at HANARO, which is operating under the Nuclear R&D Program of MOST.
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