A novel flower‐like metal‐based oxides with cross‐linked networks for rapid lithium‐ion storage

Abstract

Summary A cross‐linked MnO2 coated ZnFe2O4 hollow nanosphere composite is synthesized and controlled via a facial and handy route. The connected MnO2 nanoplates form a cross‐linked network, which is conducive to the rapid transfer of Li ions. The composite with unique architecture can not only release the strain and stress caused by the insertion and desertion of lithium ions but also greatly improve the electrical conductivity and lithium ion diffusivity. Consequently, when used as a lithium‐ion battery anode material, the electrode shows an excellent initial reversible capacity of 933.5 mAh/g with an initial coulombic efficiency of 62.5%. After 100 cycles, the reversible capacity stabilized at 605.6 mAh/g with a high capacity retention of 91% from the 20th cycle to the 100th cycle. At a high current density of 3 A/g, an excellent capacity of 390.6 mAh/g can be retained. In this case, the electrode shows broad application prospects for novel power storage systems.

Flexible g‐C3N4 Enhancing Superior Cycling Stability of ZnFe2O4‐Fe2O3 Nanosheet Composites as High‐Capacity Anode Materials for Lithium‐Ion Batteries

“…(1–4). Furthermore, in the subsequent scans, it can be seen that the reduction peak shifted upwards from 0.508 V in the first sweep to 0.926 V, indicating the presence of irreversible capacity loss and incomplete conversion reaction in the first cycle, while the position of the oxidation peak barely changed significantly [65,66] . In addition, the cyclic voltammetry curves of the 2nd and 3rd turned almost coincide, indicating the excellent electrochemical reversibility of the ZFO‐Fe 2 O 3 nanosheets. $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {{\rm Z}{\rm n}{\rm F}{\rm e}}_{2}{{\rm O}}_{4}+8{{\rm L}{\rm i}}^{+}+8{{\rm e}}^{-}\to {{\rm Z}{\rm n}}^{0}+2{{\rm F}{\rm e}}^{0}+4{{\rm L}{\rm i}}_{2}{\rm O}{\rm \ }\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {{\rm Z}{\rm n}}^{0}+{{\rm L}{\rm i}}^{+}+{{\rm e}}^{-}\leftrightarrow {\rm L}{\rm i}{\rm Z}{\rm n}{\rm \ }\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr 2{\rm F}{\rm e}{\rm O}+{{\rm L}{\rm i}}_{2}{\rm O}\leftrightarrow {{\rm F}{\rm e}}_{2}{{\rm O}}_{3}+2{{\rm L}{\rm i}}^{+}+2{{\rm e}}^{-} \hfill\cr}}$$$ …”

“…Furthermore, in the subsequent scans, it can be seen that the reduction peak shifted upwards from 0.508 V in the first sweep to 0.926 V, indicating the presence of irreversible capacity loss and incomplete conversion reaction in the first cycle, while the position of the oxidation peak barely changed significantly. [65,66] In addition, the cyclic voltammetry curves of the 2nd and 3rd turned almost coincide, indicating the excellent electrochemical reversibility of the ZFO-Fe 2 O 3 nanosheets.…”

MoO2/C hybrid synthesized by a facile molten‐salt‐assisted approach for high‐performance lithium‐ion batteries

“…10 Similarly, flower-like ZnFe 2 O 4 @MnO 2 composites with cross-linked networks have been synthesized and controlled by hydrothermal synthesis technique, which displayed a capacity level of 605.6 mAh g −1 at 500 mA g −1 . 11 The composites of Mn 3 O 4 nanorods wrapped by N-doped rGO also exhibited 660 mAh g −1 at 963 mA g −1 (1 C) after 500 cycles. 12 Molybdenum dioxide (MoO 2 ) is an excellent substitute as anodes due to its notable characterization, including an extremely high discharge capacity (838 mAh g −1 ), ecofriendliness, and widespread availability.…”

High rate and capacity performances of functionalized MXene/graphene heterostructure anodes for magnesium‐ion batteries

“…[1][2][3][4][5][6][7][8][9][10] Developing high performance anodes is necessary for the application of rechargeable ion batteries, which has been made many efforts for LIBs. 8,11,12 One important challenge for MIBs is that Mg metal is inapplicable to be an anode with traditional electrolytes due to the irreversible formation of insulating passivation layers on the surface of Mg metal, and which can result in failures in the stripping and plating of magnesium. 13,14 Therefore, exploiting alternative Mg intercalation anode materials is important for MIBs.…”

“…As a portable power, magnesium‐ion batteries (MIBs) are regarded as the promising next‐generation batteries because of the fascinating advantages including no dendrite formation, small ion radius, excellent safety and abundant element comparing to commercialized lithium‐ion batteries (LIBs) 1‐10 . Developing high performance anodes is necessary for the application of rechargeable ion batteries, which has been made many efforts for LIBs 8,11,12 . One important challenge for MIBs is that Mg metal is inapplicable to be an anode with traditional electrolytes due to the irreversible formation of insulating passivation layers on the surface of Mg metal, and which can result in failures in the stripping and plating of magnesium 13,14 .…”