Synthesis of entanglement structure in nanosized Li4Ti5O12/multi-walled carbon nanotubes composite anode material for Li-ion batteries by ball-milling-assisted solid-state reaction

Solid-state reactions are used for synthesizing Li4Ti5O12 (LTO) of high purity and crystallinity. However, it is not easy to control the particle size of LTO in these reactions. In this study, an entanglement structure for an LTO/multi-walled carbon nanotube (MWCNT) composite is prepared by a ball-milling-assisted solid-state reaction. The LTO nanoparticles are confined in the interspace of the MWCNT matrix via this architecture control. The additive of MWCNTs can prevent the aggregation of LTO particles during the calcination process of the solid-state reaction. In addition, the entanglement of the MWCNTs and LTO creates an effective conductive network, which improves the conductivity of LTO. Therefore, the entanglement structure improves the electrochemical properties of LTO, such as the rate capability and cycle performance.

► We synthesize an entanglement structure in nano-sized LTO/MWCNTs composite anode material. ► We examine the advantages of LTO/MWCNTs. ► Aggregation of LTO particle can be prevented by the addition of MWCNTs. ► Electronic conductivity of LTO can be improved by the formation of 3D conductive network. ► Entanglement structure of LTO/MWCNTs is reliable.