Synthesis of Vesicle-Like MgFe₂O₄/Graphene 3D Network Anode Material with Enhanced Lithium Storage Performance

Abstract

Vesicle-like MgFe2O4/graphene 3D network anode material was synthesized via a simple one-step in situ growth of solvothermal technique. The as-obtained unique 3D nanostructure consists of MgFe2O4 particles randomly anchored on mutual cross-linking graphene sheets functioning as a mechanical support and an efficient electron conducting pathway. The as-synthesized anode material shows an excellent rate capability and outstanding cycling stability. A specific capacity of 1300 mAh g–1 can be maintained at 1000 mA g–1 in a prolonged charge/discharge process (200 cycles). When cycling at a high current density of 10,000 mA g–1, a specific capacity of 597 mAh g–1 can still be achieved. The superior battery performance can be attributed to the unique 3D network structure, which provides an efficiently conductive network, buffers the volume expansion, and improves the structure integrity of the electrode.

CNTs@C@Cu2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

“…For Se3d XPS spectra, the peak fitted at 54.3 eV is attributed to Se 2− 3d5/2, and the peak at 55.2 eV can be ascribed to Se 2− 3d3/2 (Figure c) . Figure d displays the fine XPS spectrum of C1s, the peaks at 284.8 and 285.5 eV can be mainly assigned to sp 2 ‐C (C=C) and sp 3 ‐C (C−C), whereas the fitted peaks cores at 286.6 and 288.4 eV are attributed to C‐OH and O=C−OH groups, respectively . The C1s of pure CNTs and CNTs@C are presented in Figure e and 3 f. Compared with the pure CNTs, the peak ascribed to O=C−OH (288.4 eV for CNTs@C@Cu 2‐x Se and 289.7 eV for CNTs@C) is comparative strong.…”

“…[25] Figure 3d displays the fine XPS spectrum of C1s, the peaks at 284.8 and 285.5 eV can be mainly assigned to sp 2 -C (C=C) and sp 3 -C (CÀ C), whereas the fitted peaks cores at 286.6 and 288.4 eV are attributed to C-OH and O=CÀ OH groups, respectively. [46][47][48] The C1s of pure CNTs and CNTs@C are presented in Figure 3e To display the effect of the amorphous carbon on the morphology, the pure CNTs are used as template instead of CNTs@C without changing other reaction parameters. As depicted in Figure 4a and 4b, only dispersed nanosheets and CNTs can be observed (denoted as CNTs@Cu 2-x Se).…”

A 3D Porous MgFe2O4 Integrative Electrode as a Binder‐Free Anode with High Rate Capability and Long Cycle Lifetime

“…In addition, a pair of weak redox peaks at 1.75 V and 2.2 V may be assigned to tiny Ni 2+ coming from the slight surface oxidation of Ni foam,, which can also be inferred from the differential capacity curves (dQ/dV) of MFO and N‐MFO electrode (Figure S3). In the second cycle, the cathodic peak at 0.7 V shifts to 0.8 V and the peak at 1.2 V disappears, implying the irreversible structure transformation ,. From the 2nd cycle, the CV curves begin to coincide in shape, indicating the superior reversible performance of the N‐MFO electrode.…”

Conductive Electrospun Nanofiber Mats

“…Here again, metallic and carbon-based materials are often combined to gain a sufficient conductivity. Typically, the anode is prepared from MgFe 2 O 4 in combination with graphene [58], carbon nanotubes [59] or graphene aerogel [60,61]. MoS 2 /carbon nanofiber membranes were prepared by needle-based electrospinning and carbonization of the PAN-based precursor and used as binder-free anodes for sodium-ion batteries [62].…”