Abstract
Preparation of LiFeO2-Li2MnO3 solid solution has been attempted using hydrothermal and solid state reactions. Three 10% Fe-doped Li2MnO3 samples (Fe/(Fe + Mn) = 0.1) with different average particle sizes could be obtained by both methods. The initial charge capacities for these cathodes were sensitive to the preparation method; the capacity up to 4.3 V is 45 mAh/g for the hydrothermally-obtained sample, 24 mAh/g for the post-annealed sample after hydrothermal-treatment at 673 K, and 6 mAh/g for the sample obtained by solid state reaction at 1173 K. 57Fe Mössbauer spectra detect the oxidation of Fe3+ to Fe4+/reduction of Fe4+ to Fe3+ after initial charging/discharging for the hydrothermally obtained sample. The observed Fe3+/4+ redox voltage is between 4.0 and 4.5 V which is lower than that predicted (5 V) for Fe-doped LiMn2O4. This suggests that hydrothermally synthesized Fe-doped Li2MnO3 is an environmentally-friendly candidate as cathode material, involving a Fe3+/4+ redox reaction for rechargeable lithium batteries.
Original language | English |
---|---|
Pages (from-to) | 415-419 |
Number of pages | 5 |
Journal | Journal of Power Sources |
Volume | 97-98 |
DOIs | |
Publication status | Published - Jul 2001 |
Externally published | Yes |
Event | 10th International Meeting on Lithium Batteries - Como, Italy Duration: May 28 2001 → Jun 2 2001 |
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