Abstract
Li1.2Mn0.54Ni0.13Co0.13O2-encapsulated carbon nanofiber network cathode materials were synthesized by a facile electrospinning method. The microstructures, morphologies and electrochemical properties are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), galvonostatic charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy (EIS), etc. The nanofiber decorated Li1.2Mn0.54Ni0.13Co0.13O2 electrode demonstrated higher coulombic efficiency of 83.5%, and discharge capacity of 263.7 mAh g−1 at 1 C as well as higher stability compared to the pristine particle counterpart. The superior electrochemical performance results from the novel network structure which provides fast transport channels for electrons and lithium ions and the outer carbon acts a protection layer which prevents the inner oxides from reacting with HF in the electrolyte during charge-discharge cycling.
Highlights
Li1.2Mn0.54Ni0.13Co0.13O2-encapsulated carbon nanofiber network cathode materials were synthesized by a facile electrospinning method
Amorphous carbon layers with a thickness about 10 nm were observed on the surface of the Li1.2Mn0.54Ni0.13Co0.13O2 particles, which may be regarded as protection layer during electrochemical cycling
Li1.2Mn0.54Ni0.13Co0.13O2-ecapulated carbon nanofiber network were prepared through a facile electrospinning method following by a heat treatment
Summary
Li1.2Mn0.54Ni0.13Co0.13O2-encapsulated carbon nanofiber network cathode materials were synthesized by a facile electrospinning method. The relatively low capacity (140 mAh g−1), high cost and toxicity of the cobalt have hindered its further application for the demand of future electric technology In this case, development of alternative higher energy, lower cost and environment friendly cathodes is critical for generation Li-ion batteries[1,2]. Li-rich cathode materials xLi2MnO3 (1-x) LiMO2 (M = M n, Co, Ni) have drawn much attention owing to its high capacity of more than 250 mAh g−1 at a lower cost compared to LiCoO2 Despite these merits, Li-rich layered oxides always suffer from the inferior cycling stability and rate capability, which impede their applications[1,3]. The results give a further insight into the reaction mechanism and provide a rational direction to synthesize cathode materials for Li-ion batteries
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