Fig. 3: Electrochemical characterizations of the hollow gradient-structured Fe3O4@C nanospheres (HG-Fe3O4@C) and the control samples application in lithium ion batteries. | Nature Communications

Fig. 3: Electrochemical characterizations of the hollow gradient-structured Fe3O4@C nanospheres (HG-Fe3O4@C) and the control samples application in lithium ion batteries.

From: Inorganic-organic competitive coating strategy derived uniform hollow gradient-structured ferroferric oxide-carbon nanospheres for ultra-fast and long-term lithium-ion battery

Fig. 3

A Charge-discharge curves in the voltage range from 0.05 to 3.00 V; B Cycling performances at a current density of 0.2 A g−1; C Rate performances at various current rates from 0.2 to 0.5, 1, 2, 4, 6, 8, 10 A g−1; D Nyquist plots between 100 to 0.05 kHz; E Cycling performances under a high current density of 10 and 20 A g−1. Hollow hybrid Fe3O4@C (HH-Fe3O4/C), yolk-shell Fe3O4@C (YS-Fe3O4@C), and island-type C@Fe3O4 (HI-C@Fe3O4) nanospheres were prepared for comparison.

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