Growth of lithium lanthanum titanate nanosheets and their application in lithium-ion batteries

Authors

Xi Lin, University of New South Wales
Hongqiang Wang, University of WollongongFollow
Haiwei Du, University of New South Wales
Xinrun Xiong, University of New South Wales
Bo Qu, University of New South Wales
Zaiping Guo, University of WollongongFollow
Dewei Chu, University of New South Wales

RIS ID

105390

Publication Details

Lin, X., Wang, H., Du, H., Xiong, X., Qu, B., Guo, Z. & Chu, D. (2016). Growth of lithium lanthanum titanate nanosheets and their application in lithium-ion batteries. ACS Applied Materials and Interfaces, 8 (2), 1486-1492.

Abstract

In this work, lithium-doped lanthanum titanate (LLTO) nanosheets have been prepared by a facile hydrothermal approach. It is found that with the incorporation of lithium ions, the morphology of the product transfers from rectangular nanosheets to irregular nanosheets along with a transition from La2Ti2O7 to Li0.5La0.5TiO3. The as-prepared LLTO nanosheets are used to enhance electrochemical performance of the LiCo1/3Ni1/3Mn1/3O2 (CNM) electrode by forming a higher lithium-ion conductive network. The LiCo1/3Ni1/3Mn1/3O2-Li0.5La0.5TiO3 (CNM-LLTO) electrode shows better a lithium diffusion coefficient of 1.5 x 10-15 cm2 s-1, resulting from higher lithium-ion conductivity of LLTO and shorter lithium diffusion path, compared with the lithium diffusion coefficient of CNM electrode (5.44 x 10-16 cm2 s-1). Superior reversibility and stability are also found in the CNM-LLTO electrode, which retains a capacity at 198 mAh/g after 100 cycles at a rate of 0.1 C. Therefore, it can be confirmed that the existence of LLTO nanosheets can act as bridges to facilitate the lithium-ion diffusion between the active materials and electrolytes.