Facile synthesis of Li4Ti5O12/C composite with super rate performance
- 16 August 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 5 (11), 9595-9602
- https://doi.org/10.1039/c2ee22591c
Abstract
The Li4Ti5O12/C composite with lump morphology and excellent rate performance are synthesized using a facile hydrothermal method followed by a low temperature heat treatment. In the hydrothermal process, the introduction of cetyltrimethylammonium bromide (CTAB) as a surfactant significantly improves the rate performance of Li4Ti5O12/C composite as anode material for lithium ion battery (LIB). The specific capacities of the obtained composite at charge and discharge rates of 0.1, 1, 5, 10 and 20 C are 176, 163, 156, 151 and 136 mA h g−1, respectively, which is apparently larger than those of the Li4Ti5O12/C free from CTAB in the preparation. The Li4Ti5O12/C prepared in presence of CTAB also shows excellent cycling performance at high rate, which is attributed to its larger diffusion coefficient of lithium ion (6.82 × 10−12 cm2 s−1) and smaller charge-transfer resistance (Rct) (19.2 Ω) than those of the composite (1.22 × 10−13 cm2 s−1 and 50.2 Ω) free from CTAB in the preparation. The Li4Ti5O12 particles obtained in presence of CTAB are coated uniformly by a thin carbon layer with a thickness of ∼1 nm, whereas the Li4Ti5O12 particles obtained in absence of CTAB are covered by relatively thick surface layers with a thickness of ∼2.5 nm, which is too thick, blocks the lithium ion diffusion and leads to low ionic conductivity.Keywords
This publication has 45 references indexed in Scilit:
- Nanostructured Anode Material for High‐Power Battery System in Electric VehiclesAdvanced Materials, 2010
- Graphene‐On‐Silicon Schottky Junction Solar CellsAdvanced Materials, 2010
- On the Electrochemical Behavior of Aluminum Electrodes in Nonaqueous Electrolyte Solutions of Lithium SaltsJournal of the Electrochemical Society, 2010
- Building better batteriesNature, 2008
- Nano-Sn/hard carbon composite anode material with high-initial coulombic efficiencyJournal of Power Sources, 2007
- Solid-State Chemistry and Electrochemistry of LiCo[sub 1∕3]Ni[sub 1∕3]Mn[sub 1∕3]O[sub 2] for Advanced Lithium-Ion BatteriesJournal of the Electrochemical Society, 2007
- High-Resolution In-Situ Structural Measurements of the Li4/3Ti5/3O4 “Zero-Strain” Insertion MaterialThe Journal of Physical Chemistry B, 2002
- Issues and challenges facing rechargeable lithium batteriesNature, 2001
- Zero‐Strain Insertion Material of Li [ Li1 / 3Ti5 / 3 ] O 4 for Rechargeable Lithium CellsJournal of the Electrochemical Society, 1995
- Spinel Anodes for Lithium‐Ion BatteriesJournal of the Electrochemical Society, 1994