Hydrothermal synthesis of Li4-xNaxTi5O12 and Li4-xNaxTi5O12/graphene composites as anode materials for lithium-ion batteries
School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
* Corresponding author: Ji-ping ZHU; Tel:18919665197; E-mail: email@example.com
A potential Lithium-ion battery anode material Li4-xNaxTi5O12 (0≤x≤0.15) has been synthesized via a facile hydrothermal method with short processing time and low temperature. The XRD and FE-SEM results indicate that samples with Na-doped are well-crystallized and have more homogeneous particle distributions with smaller overall particle size in the range of 300-600nm. Electrochemical tests reveal that Na-doped samples exhibit impressive specific capacity and cycle stability compared to pristine Li4Ti5O12 at high rate. The Li3.9Na0.1Ti5O12 electrode deliver an initial specific discharge capacity of 169mAh/g at 0.5C and maintained at 150.4mAh/g even after 40 cycles with the reversible retention of 88.99%. Finally, a simple solvothermal reduction method was used to fabricate Li3.9Na0.1Ti5O12/graphene(Li3.9Na0.1Ti5O12/G) composite. Galvanostatic charge-discharge tests demonstrate that this sample has remarkable capacities of 197.4mAh/g and 175.5mAh/g at 0.2C and 0.5C rate, respectively. This indicates that the Li3.9Na0.1Ti5O12/G composite is a promising anode material for using in lithium-ion batteries.
Key words: Li4Ti5O12 / Na-doping / graphene / hydrothermal synthesis.
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