Title

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

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.

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Link to publisher version (DOI)

http://dx.doi.org/10.1021/acsami.5b10877