Rational construction the composite of graphene and hierarchical structure assembled by Fe 2 O 3 nanosheets for lithium storage

Facile Fabrication of Fe2O3 Nanoparticles Anchored on Carbon Nanotubes as High‐Performance Anode for Lithium‐Ion Batteries

“…However, specific capacity decreases from 569 to 532 mAh g −1 in the 2nd‐20th cycles and then showed a monotonic increase from 532 to 1231 mAh g −1 in the 20th–750th cycles. This capacity enhancement is not unusual and has been frequently observed for previously reported Fe 2 O 3 based anode ,,,,, Such phenomenon can be attributed to three possible mechanism: 1) the electrochemical milling effect due to repeated volume expansion during cycling, which could reduce size of electroactive materials and thus enlarge contact area between the active sites and electrolytes; 2) interfacial lithium storage at two‐phase boundary of metal/Li 2 O; or 3) extra lithium storage via reversible formation/dissolution of SEI layer ,…”

“…reported an ultrahigh reversible capacity of 2071 mAh g −1 for the encapsulated Fe 2 O 3 nanoparticles in CNTs at 0.05 A g −1 . It should be mentioned that the reported 2545 mAh g −1 by this research occupies the highest lithium storage capacities reported for Fe 2 O 3 at present, which can be attributed to the above‐mentioned capacity enhancing mechanism ,,,…”

“…Due to high lithium storage capacities, nanosized transition metal oxides (M x O y , where M is Co, Ni, Mn or Fe) have been extensively explored as promising anode materials for the next‐generation lithium‐ion batteries (LIBs) ,. Amongst these transition metal oxides, Fe 2 O 3 is considered as an attractive candidate due to its high theoretical capacity (1007 mAh g −1 ), low cost and environmental benignity . However, the lithium storage mechanism of Fe 2 O 3 is an electrochemical conversion process, which leads to drastic volume variation, pulverization of the electrode, and thus poor cycling stability .…”

Enhanced performance of alpha‐Fe 2 O 3 nanoparticles with optimized graphene coated layer as anodes for lithium‐ion batteries

“…It could be concluded that the addition of PDDA can promote the dispersion of the Fe (OH) 3 colloid because of the electrostatic interaction. Therefore, the amount of PDDA affects the final morphology of the α‐Fe 2 O 3 coated materials which might contribute to a reduction in internal resistance and an increase in electron transfer rates …”

Electrochemical Characteristics of Cobaltosic Oxide in Organic Electrolyte According to Bode Plots: Double‐Layer Capacitance and Pseudocapacitance

“…[9] Compared with double layer capacitance, the charge density stored with pseudocapacitance is several times higher. Among all sources, the pseudocapacitive contribution in transition metal oxides was not only demonstrated to show differential capacity (dQ/dV) curves [10] but also proven to become increasingly important, [3][4][5][11][12][13][14][15] which resulted in reversible capacities exceeding the theoretical value for Co 3 O 4 , [16][17][18][19][20][21][22][23][24][25] Fe 2 O 3 , [26][27][28][29][30] RuO 2 [31] and so forth. There are 3 possible sources for the capacities (charge storage) of electrode materials.…”