Mesoporous Fe₃O₄@C submicrospheres evolved by a novel self-corrosion mechanism for high-performance lithium-ion batteries

Abstract

Mesoporous Fe3O4@C submicrospheres with high conductivity and structural stability exhibit fascinating electrochemical performance.

The Preparation of Fe3O4 Thin Film and Its Electrochemical Characterization for Li-Ion Battery

“…Figure 5a depicts the first two CV profiles of Fe 3 O 4 thin films in the potential range of 0.005-3 V at scan rate of 0.5 mV s −1 . Three redox peaks were observed during the oxidation and reduction reaction, suggesting the similar charge-discharge process according to the Fe 3 O 4 -based anodes [17][18][19][20]. The peak at 0.6 V is corresponded to the reduction of Fe 3+ and Fe 2+ to Fe 0 and the formation of amorphous Li 2 O accompanied by irreversible side reaction related to the electrolyte decomposition [21,22].…”

Biological Metabolism Synthesis of Metal Oxides Nanorods from Bacteria as a Biofactory toward High‐Performance Lithium‐Ion Battery Anodes

“…From the second cycle onward, the reduction peak shifts distinctly to the higher potential of ≈0.9 V, implying that the kinetics of the reduction process of Fe 3+ to Fe 0 are improved after the structure realignment and electrochemical activation during the first cycle . Although the oxidation peak has a positive shift, it still locates around 1.7–1.8 V. Moreover, the intensities of reduction and oxidation peaks both decrease in the second cycle, particularly the reduction peak, which results from the formation of SEI layer on the surface of Fe 2 O 3 electrode during the initial lithiation process . However, the good overlap of CV curves in the subsequent cycles demonstrates the superior electrochemical reversibility of biometabolic α‐Fe 2 O 3 nanorods for Li storage.…”

“…Iron‐based oxides (e.g., α‐Fe 2 O 3 , γ‐Fe 2 O 3 , and Fe 3 O 4 ) as promising anode materials for LIBs have deserved soaring attention because of their much higher capacity than that of conventional graphite (372 mAh g −1 ), as well as nontoxicity, abundance, and low cost . Particularly, α‐Fe 2 O 3 electrochemically reacted with Li + ions via the conversion mechanism (Fe 2 O 3 + 6Li + + 6 e − ↔ 2Fe + 3Li 2 O) theoretically delivers an extremely high capacity of 1007 mAh g −1 .…”

Topochemical Synthesis of 2D Carbon Hybrids through Self‐Boosting Catalytic Carbonization of a Metal–Polymer Framework

“…[15] Va lues of electrolyte resistance (R e )a nd charge transfer resistance (R SEI+ct )w ere simulated to be 11.3 W and 88.9 W respectively,i ndicating an appropriate internal resistance and excellent ion transportation. [16,17] Figure 5a shows the cycling performance of the cell with FeO x @GCNs-20 hatacurrent density of 500 mA g À1 .Ascan be observed, the cell offered ahigh initial discharge capacity of 1088 mAh g À1 whereas the discharge capacity dropped to 596 mAh g À1 at the second cycle,e xhibiting an irreversible capacity loss of 45.2 %. [16] Thev alue of Warburg coefficients s w was determined to be 77.6 W s À0.5 and the lithium diffusion coefficient DLi + was 2.95 10 À13 cm 2 s À1 which was ac ompetitive value for iron oxide based Lithium ion batteries.…”