Characterization and Electrochemical properties of Lithium Titanate Synthesized in Supercritical Fluids
- Characterization and Electrochemical properties of Lithium Titanate Synthesized in Supercritical Fluids
- 아궁; 김재훈
- Issue Date
- 10th International Symposium on Supercritical Fluids
- Recently lithium titanate (Li4Ti5O12, LTO) has received a considerable attention as a potential material for large-scale 2nd lithium ion battery applications such as plug-in hybrid electric vehicle and energy storage unit. This is due to its beneficial properties including long-term cycleability, high flat discharge voltage at 1.55 V (vs. Li/Li+), high reversible capacity, and good safety. Herein, LTO nanoparticles were synthesized in supercritical water (scH2O) and supercritical methanol (scMeOH) condition (400 °C and 300 bar) followed by calcination at temperatures of 600-800 °C in air. Nanosized LTO particles with a high crystallinity were produced in a very short reaction time (15 min) with subsequent calcination at a low temperature of 700 °C. The LTO produced in scMeOH exhibited a mesoporous structure with surface areas of 50-100 ㎡/g while the one produced in scH2O exhibited well-faceted structure with surface areas of 10-38 m2/g. The LTO retained a high electrochemical capacity of 160 mAh g−1 at 1 C and stable cycleability up to 50 cycles. Even at a high current density of 1750 mA/g (10 C), the discharge capacity still retained a high value (107 mAh g−1). The particle properties and the electrochemical performance of LTO prepared in scH2O and scMeOH were compared with those from a conventional solid-state method.
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