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NaMnTi(PO)/C Nanofiber Free-Standing Electrode for Long-Cycling-Life Sodium-Ion Batteries. | LitMetric

NaMnTi(PO)/C Nanofiber Free-Standing Electrode for Long-Cycling-Life Sodium-Ion Batteries.

Nanomaterials (Basel)

Department of Chemistry, Physical Chemistry Section & C.S.G.I. (Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase), University of Pavia, Via Taramelli 16, 27100 Pavia, Italy.

Published: May 2024

AI Article Synopsis

  • - Self-standing NaMnTi(PO)/carbon nanofiber (CNF) electrodes are created through a process of electrospinning and heat treatment, achieving a structure that enhances conductivity and material interaction.
  • - The resulting electrodes show impressive electrochemical performance, with an initial discharge capacity of 124.38 mAh/g and maintaining over 59.6% capacity after 1000 cycles at 1C, indicating excellent cycling stability.
  • - The design benefits from the porous nature of CNFs, which facilitates better electrolyte diffusion and contact with the active material, contributing to its strong performance compared to traditional tape-casted electrodes.

Article Abstract

Self-standing NaMnTi(PO)/carbon nanofiber (CNF) electrodes are successfully synthesized by electrospinning. A pre-synthesized NaMnTi(PO) is dispersed in a polymeric solution, and the electrospun product is heat-treated at 750 °C in nitrogen flow to obtain active material/CNF electrodes. The active material loading is 10 wt%. SEM, TEM, and EDS analyses demonstrate that the NaMnTi(PO) particles are homogeneously spread into and within CNFs. The loaded NaMnTi(PO) displays the NASICON structure; compared to the pre-synthesized material, the higher sintering temperature (750 °C) used to obtain conductive CNFs leads to cell shrinkage along the axis. The electrochemical performances are appealing compared to a tape-casted electrode appositely prepared. The self-standing electrode displays an initial discharge capacity of 124.38 mAh/g at 0.05C, completely recovered after cycling at an increasing C-rate and a coulombic efficiency ≥98%. The capacity value at 20C is 77.60 mAh/g, and the self-standing electrode exhibits good cycling performance and a capacity retention of 59.6% after 1000 cycles at 1C. Specific capacities of 33.6, 22.6, and 17.3 mAh/g are obtained by further cycling at 5C, 10C, and 20C, and the initial capacity is completely recovered after 1350 cycles. The promising capacity values and cycling performance are due to the easy electrolyte diffusion and contact with the active material, offered by the porous nature of non-woven nanofibers.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11085064PMC
http://dx.doi.org/10.3390/nano14090804DOI Listing

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