Hierarchical mesoporous Li2Mn0.5Fe0.5SiO4 and Li2Mn0.5Fe0.5SiO4/C assembled by nanoparticles or nanoplates as a cathode material for lithium-ion batteries

• Mesoporous LMFS and LMFS/C have been synthesized by hydrothermal method.
• The pure-phase LMFS and LMFS/C have been successfully produced.
• LMFS and LMFS/C show hierarchical structure consisted of nanoparticles or nanoplates.
• The optimized micro-shuttle LMFS/C shows improved electrochemical property.
• The Rct and DLi have been detailedly investigated.

Hierarchical mesoporous Li2Mn0.5Fe0.5SiO4 consisted of nanoparticles or nanoplates has been successfully synthesized for the first time by a hydrothermal method. Their carbon-coated composites are obtained by a heat treatment in the presence of citric acid. These composites were characterized by powder X-ray diffractometry, scanning and transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis. The lithium storage capacity and cycling performance of the optimized Li2Mn0.5Fe0.5SiO4/C composite are greatly enhanced when tested as a cathode material in lithium-ion batteries (LIBs). It exhibits a discharge capacity of 125 mAh g−1after 60 cycles at a rate of 0.1 C. This superior electrochemical property could be ascribed to high purity and mesoporous structure of Li2Mn0.5Fe0.5SiO4, which greatly enhances the electronic conductivity as well as the diffusion coefficient of lithium ions.

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