4.35×10−16 NPs 9.03 92.84 28.25 30.6 α-Fe2O3 After 200 NFs 3.51 29.95 25.34 10.4 3.37×10−15 α-Fe2O3 cycles γ-Fe2O3@C 5.06×10−15 2.87 22.44 22.75 9.7 NFs After 200 cycles, the values of three samples decreased significantly and σ NFs shows the lower value than that of other electrodes, indicating the efficient diffusion of Li+ into the electrode materials. Besides, the NFs γ-Fe2O3@C electrode presents the Li+ diffusion coefficient of 5.06×10−15 cm2 s−1, which is higher than that of the NFs (3.37×10−15 cm2 s−1) and NPs (4.35×10−16 α-Fe2O3 cm2 s−1); this explains the good Li ion diffusion ability of the NFs. γ-Fe2O3@C
After 200 cycles α-Fe2O3 NPs 9.03 92.84 28.25 30.6 4.35×10−16 α-Fe2O3 NFs 3.51 29.95 25.34 10.4 3.37×10−15 γ-Fe2O3@C NFs 2.87 22.44 22.75 9.7 5.06×10−15 After 200 cycles, the σ values of three samples decreased significantly and NFs shows the lower value than that of other electrodes, indicating the efficient diffusion of Li+ into the electrode materials. Besides, the γ-Fe2O3@C NFs electrode presents the Li+ diffusion coefficient of 5.06×10−15 cm2 s−1, which is higher than that of the α-Fe2O3 NFs (3.37×10−15 cm2 s−1) and NPs (4.35×10−16 cm2 s−1); this explains the good Li ion diffusion ability of the γ-Fe2O3@C NFs.
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