4.6 Article

Synthesis of defects and TiO2 co-enhanced Li4Ti5O12 by a simple solid-state method as advanced anode for lithium-ion batteries

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SPRINGER
DOI: 10.1007/s10854-021-05383-x

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  1. National Natural Science Foundation of China [21965034, U1903217, 21666037]
  2. Resource Sharing Platform Construction Project of Xinjiang Province [PT1909]

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By introducing defects and TiO2 into Li4Ti5O12, high performance and low process cost can be achieved simultaneously.
High performance and low process cost are two contradictory issues, which limited the commercial application of Li4Ti5O12 (LTO). Here, defects and TiO2 co-enhanced LTO have been synthesized by a simple solid-state method. The crystal structure and morphology of the as-synthesized samples were characterized. The results show that the uniform nanoparticles with spinel structure contained defects and TiO2. Defects and TiO2 co-enhanced LTO shows outstanding reversible discharge capacity of 168.2 mAh g(-1) at 1 C after 500 cycles. Further, it presents a stability discharge ability of 155 mAh g(-1) at 55 degrees C at 1 C after 500 cycles. The advanced electrochemical performance could be attributed to the defects and TiO2 in LTO, which enhance conductivity and produce rich reaction interface, facilitating Li+ ion diffusion kinetics. The as-synthesized LTO shows high performance in conjunction with low process cost.

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