Abstract
Br-doped lithium titanium oxide (Li4Ti5O12) particles in the form of Li4Ti5Br x O12-x (x = 0, 0.1, 0.2, 0.3, 0.4) are synthesized via a simple liquid deposition reaction, followed by a high-temperature treatment. The effects of bromine (Br) doping on the structures and electrochemical properties of Li4Ti5O12 are extensively studied. It is found that Br atoms can enter the lattice structure and enlarge the lattice parameters of Li4Ti5O12. Although Br doping has not changed the phase composition, obvious effects on the particle’s morphology and size have been observed. Electrochemical test results indicate that the rate capability of Li4Ti5O12 has been evidently improved by Br doping at an appropriate concentration. The as-synthesized Li4Ti5O11.8Br0.2 electrode presents much higher discharge capacity and better cycle stability than that of the other electrodes. The greatly enhanced electrochemical performance of Li4Ti5O11.8Br0.2 may be attributed to the improved dispersion of nanoparticles and increased electrical conductivity.
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