Electrochemical and transport properties of Te-doped Li4Ti5O12 as anode material for lithium-ion half/full batteries.

Te-doped Li 4 Ti 5 O 12 (LTO) was prepared by a ball milling-assisted solid-state method in air. The as-prepared powders were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and electrochemical impedance spectroscopy. Li 4 Ti 4.95 Te 0.05 O 12 powder sintered at 850 °C presented improved ionic and electronic conductivities of 2.20 × 10-7 S·cm-1 and 2.40 × 10-9 S·cm-1 at room temperature, respectively, an order of magnitude higher than those of intrinsic LTO. Electrochemical analysis showed that the discharge specific capacities of Li 4 Ti 4.95 Te 0.05 O 12 in Li half cells at 1 C and 5 C were 162.49 mAh·g-1 and 143.5 mAh·g-1, respectively, with capacity retention rates of 98.8% and 98.2% after 100 cycles. The Li 4 Ti 4.95 Te 0.05 O 12 /LiNi 0.5 Mn 0.3 Co 0.2 O 2 full cells also showed a good specific capacity of 101.8 mAh·g-1 at 1 C and delivered good temperature adaptability. This study provides an effective strategy for the preparation of high-performance LTO anodes for lithium-ion batteries. • Excellent transport characteristics of Li 4 Ti 4.95 Te 0.05 O 12 with an ionic conductivity of 2.20 × 10-7 S·cm-1. • High discharge specific capacity of 120.25 mAh·g-1 at high rate of 10 C in Li 4 Ti 4.95 Te 0.05 O 12 half cell. • Excellent capacity retention rate of 99.7% after 400 cycles and good specific capacity of Li 4 Ti 4.95 Te 0.05 O 12 /LiNi 0.5 Mn 0.3 Co 0.2 O 2 full cell. [ABSTRACT FROM AUTHOR]