Simulated synthesis and structure of LixTiO2 nanosheets as anode material for lithium ion batteries.

Nano-architectured Li x TiO 2 are promising as anode electrode materials for lithium rechargeable batteries due to their ability to accommodate and transport lithium atoms at low and elevated temperatures. In the current study, lithiated nanosheets with concentrations, Li 0. 03 TiO 2 and Li 0. 07 TiO 2 , were crystallised from amorphous precursors at 2000K, using large scale molecular dynamics (MD) simulation method, which was followed by a cooling process towards 0 K. The cooled nanosheets, Li 0. 03 TiO 2 and Li 0. 07 TiO 2 , were subsequently heated at temperature intervals of 100 K from 100 K to 500 K with a Nose-Hoover thermostat. The calculated Ti-O radial distribution functions (RDFs), were used to confirm the extent of crystallisation after cooling. The simulated X-ray diffraction (XRD) spectra, at low (0 K) and high (500 K) temperatures, exhibit peaks associated with both rutile and brookite polymorphs. Microstructural features also depicted diffusion pathways with rutile and brookite character, consistent with XRD results. These results confirm that the Li 0. 03 TiO 2 and Li 0. 07 TiO 2 nanosheets are good candidates for anode materials in lithium ion batteries (LIB), since they can contain and transport lithium ions well, even under higher temperature conditions. Lithiated snapshots of evolving microstructures of nanosheets (Li 0. 03 TiO 2) at 0 K and 500 K with different types of defects. Image 1 • We report first time atomistic simulation of TiO 2 nanosheets materials intercalated with 0.03 and 0.07 Li ions. • The L 0.03 TiO 2 and L 0.07 TiO 2 nanosheets shows wide open channels after recrystallisation synthesis. • The crystalline L 0.03 TiO 2 and L 0.07 TiO 2 nanosheets show closed channels after cooling process. • The materials shows similar characteristics at low and high temperature which are then excellent anode electrode materials. [ABSTRACT FROM AUTHOR]