Abstract
NiFe2O4 porous nanorods/graphene composites are synthesized by a solvothermal method in combination with calcination at 400°C. Uniform NiFe2O4 porous nanorods with a diameter of about 300nm and a length of several micrometers are homogeneously anchored on graphene sheets. The close and firm contact between the two components assures the sound electrochemical properties. The lithium-ion battery performance of the composites anode is evaluated by galvanostatic and rate performance. NiFe2O4 porous nanorods/graphene composites electrode exhibit a superior lithium storage capability. The first discharge capacity of the composites electrode is 1115mAhg−1 at a current density of 1Ag−1, and still maintains at 655mAhg−1 even after 600 cycles. Even at a high current density of 5Ag−1, a high reversible specific capacity of 509mAhg−1 can be achieved. The synergistic effect between graphene with excellent electrical conductivity and NiFe2O4 nanorods with porous structure makes a substantial contribution to the outstanding electrochemical performance.
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