Facile one step synthesis and enhanced electrochemical performance of Molybdenum dioxide and carbon co-modified lithium manganese silicate cathode materials for lithium-ion batteries
By Jiangtao Zhu and Haoqing Tang and Zhiyuan Tang and Chenxiang Ma and Qiang Xu and Xinhe Zhang
Published in Electrochimica Acta
NULL
2015
Abstract
Through facile one step sol-gel method, Li2MnSiO4-based cathode materials have been successfully synthesized and co-modified with carbon and MoO2 coating. The phase compositions and morphology of the as-prepared products have been characterized by XRD, \SEM\ and TEM. The physical characterization indicates the introduced MoO2 exists on the particle surface of orthorhombic Li2MnSiO4, forming a hybrid coating layer with amorphous carbon. Meanwhile, the addition of MoO2 improves the dispersion of particle size distribution. Therefore, the electrochemical performance of the pristine Li2MnSiO4/C has been significantly improved after coating MoO2, especially in the case of 1 wt% MoO2 component. The optimal as-prepared sample exhibits a reversible capacity of 184.9 mA h/g at 0.1C and maintains 127.5 mA h/g even at a high rate of 1C. The excellent rate performance can be attributed to reduced interfacial resistance and enhanced lithium ion diffusion coefficient.
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