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Published in:
29-04-2019
Enhanced electrochemical performance of Li4Ti5O12/carbon nanotubes/glucose composite as anode material for lithium ion batteries
Published in: Journal of Materials Science: Materials in Electronics | Issue 11/2019
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Abstract
Li4Ti5O12 (LTO)/carbon nanotubes (CNTs)/glucose (g) composite is synthesized via solid method followed by sonicating. The influences of carbon nanotubes and glucose additives on the microstructure and electrochemical performances of LTO are investigated. As-prepared LTO composited with 2.5 wt% CNTs and 2 wt% glucose (LTO/2.5CNTs/2 g) exhibits excellent electrochemical performances. On the one hand, LTO/2.5CNTs/2 g composite shows well dispersed between LTO particles and CNTs with width of 200–400 nm. On the other hand, with higher surface areas 45.8839 m2 g−1 and pore volume of 0.2036 ml g−1, the discharge capacity of LTO/2.5CNTs/2 g can reach 251.9 mAh g−1 at 20 mA g−1, while its discharge capacity still reaches 119.3 mAh g−1 at 2 A g−1. Additionally, LTO/2.5CNTs/2 g composite achieves initial discharge capacity of 173.2 mAh g−1 at 1 A g−1, stabilizing at 118.9 mAh g−1 after 1000 cycles. More importantly, its band gap is the least with Li+ diffusion coefficient 1.14 × 10−11 cm2 s−1.