Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li₄Ti₅O₁₂.

ABSTRACT: Lithium titanium oxide (Li₄Ti₅O₁₂, LTO), a 'zero-strain' anode material for lithium-ion batteries, exhibits excellent cycling performance. However, its poor conductivity highly limits its applications. Here, the structural stability and conductivity of LTO were studied using in situ high-pressure measurements and first-principles calculations. LTO underwent a pressure-induced amorphization (PIA) at 26.9 GPa. The impedance spectroscopy revealed that the conductivity of LTO improved significantly after amorphization and that the conductivity of decompressed amorphous LTO increased by an order of magnitude compared with its starting phase. Furthermore, our calculations demonstrated that the different compressibility of the LiO₆ and TiO_6<

SUBMITTER: Huang Y 

PROVIDER: S-EPMC8291545 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature