Self‐Assembled Porous NiFe₂O₄ Floral Microspheres Inlaid on Ultrathin Flake Graphite as Anode Materials for Lithium Ion Batteries

Abstract

A fairly simple and environmentally friendly hydrothermal method is reported to synthesize anode materials composed of NiFe2O4 (NFO) and ultrathin flake graphite (UFG), which are denoted as NFO/UFG composites. Several experiments were then carried out in order to determine the most beneficial proportion of UFG in the composite. Finally, it was found that the NFO/UFG‐2 composite exhibits the most beneficial morphological structure which is characterized as three‐dimensional floral NFO microspheres assembled by many porous nanosheets anchored on the pedestal of UFG (as determined from SEM and TEM measurements). In addition, the NFO/UFG‐2 composite also demonstrates the best electrochemical performances. It shows a stable long‐term cycling performance with a high initial Coulombic efficiency of 83.4 % and even obtains a high specific capacity of 963.4 mAh g−1 after 300 cycles at a current density of 200 mA g−1 and remarkable reversibility not only at low current densities but also at high current densities. Satisfyingly, the good synergy between porous NFO and UFG significantly enhances the electronic conductivity and relieves the huge bulk expansion of traditional transition metal oxide. This unique electrode material is demonstrated to be a promising candidate for the new‐generation lithium ion batteries.

Three‐Dimensional Porous CoFe2O4/Graphene Composite for Highly Stable Sodium‐Ion Batteries

“…have been attracted increasing interests as promising anode materials for SIBs on account of their large specific capacities, high abundance, and low cost. [15,16] Besides, accompanied structural design by constructing porous ternary TMOs-carbon composite may also promote synergistic advantages for Na-storage. [11] A feasible approach is to prepare ternary TMOs that composed of two distinct metal elements in a single crystalline structure.…”

“…Meanwhile, rich redox sites for high specific capacity and enhanced electrical conductivity for fast electronic transfer can also be achieved. [15,16] Besides, accompanied structural design by constructing porous ternary TMOs-carbon composite may also promote synergistic advantages for Na-storage. Improved kinetics, increased active sites, sufficient volume expansion space as well as enhanced structural stability are highly desired.…”

Preparations of NiFe2O4 Yolk-Shell@C Nanospheres and Their Performances as Anode Materials for Lithium-Ion Batteries

“…NiFe 2 O 4 has a unique inverse spinel structure. Ni 2+ and one-half of Fe 3+ are distributed in octahedral voids, and the remaining of Fe 3+ occupies tetrahedral positions [ 40 ]. This structure has a high theoretical capacity because NFO can hold eight Li + per unit during the lithiation/delithiation process [ 41 , 42 ].…”

Ultrasmall MoS3 Loaded GO Nanocomposites as High‐Rate and Long‐Cycle‐Life Anode Materials for Lithium‐ and Sodium‐Ion Batteries

“…[7][8][9][10] For both LIBs and SIBs, the electrode materials especially anode materials are the key factors to affect the electrochemical performance. [11][12][13] Thus, it is necessary to find high performance anode materials to storage both Li + and Na + to satisfy the future energy requirements. Many anode materials are considered as anode materials for both LIBs and SIBs, such as hard carbon materials, [14,15] metal oxides or sulfides, [16][17][18] alloys, [19,20] and so forth.…”