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Preparation and Electrochemical Performance of Li4Ti5O12/SnO2 Composite as an Anode of Lithium-Ion Batteries

Li4Ti5O12/SnO2 composite with different SnO2 contents were prepared by hydrothermal method. SnO2 nanosheets were in situ formed on the surface of Li4Ti5O12 nanoparticles. At the same time, Sn ions were doped into the Li4Ti5O12 lattice, which effectively improved the conductivity of Li4Ti5O12. When the content of SnO2 was 8 %, the electrochemical performance of Li4Ti5O12/SnO2 composite was the best. The first discharge specific capacity was 480.54 mAh/g. The capacity remained at 276.8 mAh/g after 200 cycles at 0.1 A/g, and the capacity retention was as high as 87.4% (compared with the 10th cycle).