In situ synthesis and electrochemical properties of sawtooth-like Bi4Ti3O12/K0.8Ti1.73Li0.27O4 as anode material for lithium-ion batteries

Abstract

Bi-based materials have been regarded as potential anode for lithium-ion batteries because of their excellent volumetric capacity (3765 mAh·cm−3) and low potential hysteresis (0.11 V) [1]. Nonetheless, Bi-based materials are still highly needed to further develop their structural stability to adapt the application in energy storage fields. In this work, sawtooth-like Bi4Ti3O12/K0.8Ti1.73Li0.27O4 (BTO/KTLO) composites were synthesized by hydrothermal process, and sawtooth-like Bi4Ti3O12 (BTO) were grown on the side surface of K0.8Ti1.73Li0.27O4 (KTLO) as the precursor. By means of utilize plate-like titanate as supporting to enhance the structural stability of composite, and exhibits an enhanced electrochemical performance of BT/KTLO composite as LIB anode materials. In the first discharge, BTO/KTLO composites electrode has a coulombic efficiency of 62%, which is higher than that of the pure BTO and KTLO (about 40%). From the second discharge to the 100th discharge, the capacity retention of composite is 58%, and indicating a much better cycle performance than that KTLO (46.2%) and BTO (19.7%).