Hierarchical Porous CoFe2O4 Ball-in-Ball Hollow Spheres as High Performance Anode Materials for Lith

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CoFe2O4 not only has superior magnetic properties,1 but also has stable electrochemical properties.The high theoretical specific capacity (~916 mAh g-1) enable it to be an promising anode material in LIBs.Very recently,CoFe2O4 materials with diversified morphologies such as films,2 flaks,3 hollow nanospheres,4 and macroporous particles have been obtained,5 which have been applied as anode materials with enhanced properties in LIBs,however,their discharge capacity (usually decreased below 700 mAhg-1 less than 50 cycles) and rate performances (especially at high charge-discharge rates) still need further elevation.
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