Abstract
Li4Ti5O12 and Al3+ doped Li(4-x/3)AlxTi(5-2x/3)O12 (x = 0, 0.01, 0.05, 0.1, 0.15, 0.2) are synthesized at 750, 850, 950 °C via solid state reaction using TiO 2-rutile, Li2CO3 and Al2O 3 as precursors. The samples at 850, 950 °C have better phase purity than those at 750 °C. The preliminary chargeedischarge cycling test of undoped and Al3+ doped Li4Ti5O12 reveals that the electrochemical performance of the electrode prepared at 850 °C is better than that at 750, 950 °C. Therefore, the optimum calcination temperature is found to be 850 °C. Li(4-x/3)AlxTi(5-2x/3)O12 (x = 0.01, 0.05, 0.1), which is the low Al-doped sample, exhibits a higher discharge capacity and rate performance than the high Al-doped Li4Ti5O 12 (x = 0.15, 0.2) sample. The first discharge capacities at 0.2, 0.5, and 1 C are 174.4, 161.9, and 153.8 mAh g-1, respectively for Li (4-x/3)AlxTi(5-2x/3)O12 (x = 0.1). These values are similar to those of Li(4-x/3)AlxTi(5-2x/3)O 12 (x = 0.01, 0.05). The capacity retention ratio of Li (4-x/3)AlxTi(5-2x/3)O12 (x = 0.01, 0.05, 0.1) is over 99.3% after 30 cycles. The capacity increase and good rate performance in the optimum Al-doped Li4Ti5O12 are discussed in relation to the stability of the spinel structure and the resulting ease of lithium insertion.
Original language | English |
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Pages (from-to) | 527-531 |
Number of pages | 5 |
Journal | Journal of Power Sources |
Volume | 244 |
DOIs | |
State | Published - 2013 |
Bibliographical note
Funding Information:This work was financially supported by a basic research program (11-EN-03) through the Daegu-Gyeongbuk Institute of Science and Technology (DGIST) funded by the Ministry of Education, Science and Technology (MEST)
Keywords
- Aluminum doping
- Anode materials
- Lithium titanium oxide
- Lithium-ion batteries