Spray-Drying Synthesized Lithium-excess Li_4+xTi_4.95−xNb_0.05O_12−δ and its Electrochemical Property as Negative Electrode Material for Li-ion Batteries

抄録

Li_4+xTi_4.95−xNb_0.05O_12−δ (x=0.11∼0.13) materials were synthesized by using a spray-drying method followed by heat treating at 600∼900°C in air. Chemical and structural studies of the final products were done by X-ray diffraction (XRD) and inductively coupled plasma mass spectrometry (ICP-MS) etc. The optimum synthesis condition of the materials was examined in relation to the electrochemical characteristics including charge-discharge cycling tests. The charge-discharge cycling results of several the Nb-substituted samples indicated that the samples prepared at heat treatment temperature of 700°C for 12 h showed best cycling performance with the discharge capacity of 175∼140 mAh g⁻¹ at the discharge rate of 0.5∼3C.