Ternary‐Phase Li₄Ti₅O₁₂/TiO₂ Nanosheet Composite for High Rate Lithium‐Ion Batteries

Abstract

A ternary‐phase Li4Ti5O12/TiO2 (LTO/TiO2) nanosheet composite is successfully synthesized by a one‐pot hydrothermal method followed by two‐step annealing ways. It exhibits high specific capacities of 170 mAh g−1, 154 mAh g−1, 138.5 mAh g−1, and 123.9 mAh g−1 at 1 C, 10 C, 30 C and 50 C, respectively. After 3000 cycles at 20 C, over 89.2 % original specific capacity retention is maintained with approximately 100 % columbic efficiency. The excellent rate performance and cycling stability are attributed to the high crystallinity, the thin nanosheets, the high surface area, and an appropriate amount of nanostructured TiO2 seeds dispersed in the Li4Ti5O12 (LTO) matrix for the final products.

Solvothermal synthesis method for dual-phase Li4Ti5O12/TiO2 composites for high-stability lithium storage

“…A series of strategies have been implemented to improve the performance of LTO, such as multifarious structures, diverse syntheticmethods, doping of various conductive metal cations, and coating with different electric materials [9][10][11]. Recently, many experiments have proven that hollow porous structure and multiphase LTO can promote material properties.…”