Articles written in Bulletin of Materials Science

    • A short investigation on LiMn$_2$O$_4$ wrapped with MWCNT as composite cathode for lithium-ion batteries


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      The need for large-scale batteries impels the development of high-performance cathode material for advanced lithium-ion batteries (LIBs). The existing cathode materials such as LiCoO$_2$, LiNiO$_2$ and LiMnO$_2$ were rated as potentially viable cathodes for commercial applications. Among these, LiMn$_2$O$_4$ and its composites was considered a sound cathode material for high-performance LIBs. In this study, the multi-walled carbon nanotube (MWCNT)-wrapped spinel LiMn$_2$O$_4$ nanocathode was synthesized via simple sol–gel method and characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), Raman, Impedance and galvanostatic charge/discharge analyses to study their structural, morphological, optical and electrochemical properties, respectively. XRD results reveal that the pure and MWCNT-embedded LiMn$_2$O$_4$ nanocathode exhibited similar cubic structure with space group of Fd3m. The as-fabricated MWCNT/LiMn$_2$O$_4$ battery showed the excellent reversible capacity (114 mAh g$^{–1}$) with higher coulombic efficiency after multiple cycles. Herein, simple wrapping methodology was adopted to overcome the drawbacks of the pure spinel. Incorporated MWCNT uniformly entwined in the LiMn$_2$O$_4$ and lead to prevent the volume expansion, and pulverization in surface of the active LiMn$_2$O$_4$ particles, which confirmed from post FESEM analysis and their results are discussed. Interestingly, MWCNT addition showed that the enriched electrochemical properties in LiMn$_2$O$_4$ nanoparticles are able to hold as a potential cathode for high voltage LIBs.

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