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High-performance Sn@carbon nanocomposite anode for lithium batteries

2012; Elsevier BV; Volume: 226; Linguagem: Inglês

10.1016/j.jpowsour.2012.11.004

1873-2755

Ida Meschini, Francesco Nobili, Marilena Mancini, Roberto Marassi, R. Tossici, Alberto Savoini, Maria Letizia Focarete, F. Croce,

Advanced Battery Materials and Technologies

Nanosize tin particles (Sn-PMCMT) embedded in electrically conducting porous multichannel carbon microtubes are synthesized by co-electrospinning followed by air stabilization and carbonization in Ar/H2 atmosphere. Scanning and transmission electron microscopy show that the material is nanostructured with nanosize Sn particles well embedded into the carbon host matrix. Composite electrodes prepared using Sn-PMCMT, Super-P carbon and Na-carboxymethylcellulose as binder, exhibit a superior rate capability and exceptional cycle life in cell tests at room temperature. Discharge capacities as high as 632 mAh g−1 at 0.7 C rate are obtained during the first galvanostatic cycles. The delivered capacities are still in excess of 350 mAh g−1 after 600 cycles, most of them performed at 2 C rate. These outstanding results represent the highest performance so far reported for this type of electrode.