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The reasonable design of nanostructure is the key to solving the inherent defects and realizing a high performance of Li 2 FeSiO 4  cathode materials. In this work, a novel heterostructure CNT@Li 2 FeSiO 4 @C has been designed and synthesized and used as a cathode material for lithium-ion battery. It is revealed that the product has a uniform core-shell structure, and the thickness of the Li 2 FeSiO 4  layer and the outer carbon layer is about 19 nm and 2 nm, respectively. The rational design effectively accelerates the diffusion of lithium ions, improves the electric conductivity, and relieves the volume change during the charging/discharging process. With the advantages of its specific structure, CNT@Li 2 FeSiO 4 @C has successfully overcome the inherent shortcomings of Li 2 FeSiO 4  and shown good reversible capacity and cycle properties.

The Core-Shell Heterostructure CNT@Li2FeSiO4@C as a Highly Stable Cathode Material for Lithium-Ion Batteries