Heterogeneous Double-Shelled Constructed Fe₃O₄ Yolk–Shell Magnetite Nanoboxes with Superior Lithium Storage Performances

Abstract

Among the numerous candidate materials for lithium ion batteries, ferroferric oxide (FeO) has been extensively concerned as a prospective anode material because of its high theoretical specific capacity, abundant resources, low cost, and nontoxicity. Here, we designed and fabricated a unique yolk-shell construction by generating heterogeneous double-shelled SnO and nitrogen-doped carbon on FeO yolk (denoted as FeO@SnO@C-N nanoboxes). The yolk-shell structured FeO@SnO@C-N nanoboxes have the adjustable void space, which permits the free expansion of FeO yolks without breaking the double shells during the lithiation/delithiation processes, avoiding the structural pulverization. Moreover, the heterogeneous double-shelled SnO@C-N can meaningfully improve the electronic conductivity and enhance the lithium storage performance. Two metal oxides also show the specific synergistic effect, promoting the electrochemistry reaction. As a result, this yolk-shell structured FeO@SnO@C-N exhibits high specific capacity (870 mA h g at 0.5 A g after 200 cycles), superior rate capability, and long cycle life (670 mA h g at 3 A g after 600 cycles). This design and construction method can be extended to synthesize other yolk-shell nanostructured anode materials with improved electrochemistry performance.

Ultrafine SnO2 Nanocrystals Self‐Anchored in Carbon for Stable Lithium Storage

“…X‐ray photoelectron spectroscopy (XPS) data confirm the existence of Sn, O and C elements in the materials (Figure S2, SI). The signal in Sn 3d high‐resolution spectrum arises from Sn (IV), denoting the presence of SnO 2 phase in the composite . In the O 1s region, the peak at 531.2 eV is assigned to Sn−O bond and that at 532.4 eV on account of C−O−Sn .…”

One‐Step In Situ Synthesis of Three‐Dimensional NiSb Thin Films as Anode Electrode Material for the Advanced Sodium‐Ion Battery

“…Despite the great progress in the fabrication of SIB anodes, high costs, complex methods and low production yields are still the significant drawbacks. Given the complex procedures of electrode manufacture [mixing active materials, acetylene black with poly(vinylidene difluoride) and then coating with Cu foil],, developing a binder‐free electrode is becoming more urgent and important , . According to the literature, a binder‐free graphene‐supported Sb‐based anode material on Ni foam for use in LIBs and SIBs not only avoids the agglomeration of the active materials, but also increases the electron‐transfer ability and conductivity.…”

A Review: Enhanced Anodes of Li/Na-Ion Batteries Based on Yolk–Shell Structured Nanomaterials

“…The sphere is not the only YS architectures. YS polyhedron has also drawn much attention due to its tailored shape with more surfaces in energy conversion [ 76 – 79 ]. YS polyhedron can be categorized in pentahedron [ 80 ], hexahedron [ 81 ], octahedron [ 82 ] and dodecahedron [ 83 ].…”