Abstract
Fe3O4–pyrolytic graphite oxide (Fe3O4–PGO) composite has been prepared by solvothermal reaction at 200°C. The as-prepared Fe3O4–PGO composite displays excellent cycle stability and rate capability with the initial discharge capacity of 1275mAhg−1 and capacity retention of 81% after 50 cycles compared with pure Fe3O4. The reasons are as follows: (i) in situ synthesized Fe3O4 firmly anchors onto the exfoliated PGO sheets, and the PGO acts as a conductive agent to provide a fast path for electron transportation; and (ii) the interstitial cluster structure of microsphere-type Fe3O4 in Fe3O4–PGO composite facilitates more better percolation of the electrolyte, more efficient accommodation with the strain and stress of volume change upon cycling and faster Li-ion transfer.
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