Electrospun Hierarchical CaCo₂O₄ Nanofibers with Excellent Lithium Storage Properties

Abstract

Hierarchical CaCo2O4 nanofibers (denoted as CCO-NFs) with a unique hierarchical structure have been prepared by a facile electrospinning method and subsequent calcination in air. The as-prepared CCO-NFs are composed of well-defined ultrathin nanoplates that arrange themselves in an oriented manner to form one-dimensional (1D) hierarchical structures. The controllable formation process and possible formation mechanism are also discussed. Moreover, as a demonstration of the functional properties of such hierarchical architecture, the 1D hierarchical CCO-NFs were investigated as materials for lithium-ion batteries (LIBs) anode; they not only delivers a high reversible capacity of 650 mAh g(-1) at a current of 100 mA g(-1) and with 99.6% capacity retention over 60 cycles, but they also show excellent rate capability with respect to counterpart nanoplates-in-nanofibers and nanoplates. The high specific surface areas as well as the unique feature of hierarchical structures are probably responsible for the enhanced electrochemical performance. Considering their facile preparation and good lithium storage properties, 1D hierarchical CCO-NFs will hold promise in practical LIBs.

Facile Fabrication of Porous NixCo3–xO4 Nanosheets with Enhanced Electrochemical Performance As Anode Materials for Li-Ion Batteries

“…As described above, binary metal oxides have been considered as potential anode materials, which can efficiently contain the electrochemical performance of single metal oxides. Spinel compounds of AB 2 X 4 (A, B = metal, X = chalcogen) have a large number of superior properties such as low toxicity and low cost, which makes them potentially suitable for anode materials for LIBs. , As a typical spinel structure, nickel cobaltite (NiCo 2 O 4 ), which can be considered as Co in Co 3 O 4 partially substituted by Ni, appears to a promising candidate of an anode material for LIBs. , In comparison with pure NiO and Co 3 O 4 , it can be believed to be an excellent candidate as an anode material for LIBs due to its notable electrical conductivity and electrochemical activity. Therefore, it deserves to investigate as anode materials for LIBs.…”

Fabrication of Spinel One-Dimensional Architectures by Single-Spinneret Electrospinning for Energy Storage Applications

“…The rapid development and ever-growing demand in industry has focused on various applications of functional nanomaterials. The main interest lies in rational control and precise design nanomaterials with specialized morphologies and tailored properties. − Among various structures, one-dimensional (1D) nanostructure represents one of the most attractive architectures, mainly owing to their intriguing feature and great potential in various applications including catalysis, energy conversion and storage devices, gas sensors, and many others. − Until now, great success has been achieved in developing effective method to synthesize 1D nanostructures, such as nanofibers, nanobelts, and nanotubes. , Particularly, tubular nanostructures can be taken as a special 1D structure because of possessing the superiorities of both hollow and 1D structure. This fantasy feature endows them with more competitive power in widespread applications. − However, most of the tubular 1D structures reported are relatively simple.…”

Porous Ni0.5Zn0.5Fe2O4 Nanospheres: Synthesis, Characterization, and Application for Lithium Storage

“…It is also worth mentioning that there is a large deviation in potential between the charge and discharge profiles, owing to the large polarization related to ion transfer during the cycling process. This phenomenon is often observed in many metal oxide anodes due to poor electrical conductivity [15,16,39,40].…”