2010
DOI: 10.1149/1.3368696
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PAN-Encapsulated Nanocrystalline CoSn[sub 2] Particles as Negative Electrode Active Material for Lithium-Ion Batteries

Abstract: Composite electrodes were prepared throughout the reduction of tin and cobalt ions in the presence of polyacrylonitrile (PAN). The resulting product consists of tin–cobalt intermetallic nanoparticles surrounded by a PAN-based shell, the main intermetallic phase being nanocrystalline CoSn2 . The organic molecules prevented the growth of the intermetallic grains upon annealing and formed an amorphous carbon layer. The observed maximum reversible capacities are around 600 mAh/g. Excellent capacity retention was … Show more

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Cited by 15 publications
(9 citation statements)
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References 39 publications
(58 reference statements)
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“…We then aimed to determine whether uniform CoSn 2 and FeSn 2 nanoalloys, composed of mixed elements with atomic homogeneity, exhibit advantageous electrochemical performances compared with those of elemental Sn NCs and their mixtures with Co (Fe) NCs (obtained by simple mechanical mixing). Although there have been many studies on Co-Sn 27,28,[36][37][38]41,45 and Fe-Sn 25,26 nanoscopic alloys for LIBs, our comparative study requires Co, Fe, Sn, CoSn 2 , and FeSn 2 to be obtained in the form of uniform colloidal NCs of very similar sizes. After accomplishing these syntheses, we find that both CoSn 2 and FeSn 2 NCs are indeed unlike the mixtures of their elemental NCs.…”
mentioning
confidence: 99%
“…We then aimed to determine whether uniform CoSn 2 and FeSn 2 nanoalloys, composed of mixed elements with atomic homogeneity, exhibit advantageous electrochemical performances compared with those of elemental Sn NCs and their mixtures with Co (Fe) NCs (obtained by simple mechanical mixing). Although there have been many studies on Co-Sn 27,28,[36][37][38]41,45 and Fe-Sn 25,26 nanoscopic alloys for LIBs, our comparative study requires Co, Fe, Sn, CoSn 2 , and FeSn 2 to be obtained in the form of uniform colloidal NCs of very similar sizes. After accomplishing these syntheses, we find that both CoSn 2 and FeSn 2 NCs are indeed unlike the mixtures of their elemental NCs.…”
mentioning
confidence: 99%
“…The strong degradation of PAN-free FeSn 2 is observed in the impedance spectra recorded at several cycle numbers, suggesting certain losses of particle electrical contact. In contrast, the EIS spectra of FeSn 2 @PAN show well-defined semicircles due to surface layer (SEI) and charge transfer, 5,13 while the increase of the semicircles sizes from cycle 1 to 10 can be related to the observed initial capacity loss (Fig. 2a).…”
Section: Resultsmentioning
confidence: 93%
“…Thus, tin-transition metal-PAN composites have been explored as electrode materials and the encapsulation of CoSn 2 nanoparticles in a PAN matrix has been reported. 5,6 The reduction of Co(II) and Sn(II) with NaBH 4 in PAN-dimethylformamide solutions leads to CoSn 2 nanoparticles embedded in a PAN matrix (represented like CoSn 2 @PAN). The addition of PAN hinders the grain growth of the metallic phase, resulting in an improved electrochemical behavior.…”
mentioning
confidence: 99%
“…Nanocrystalline CoSn 2 particles encapsulated in a polyacrylonitrile were also produced by chemical reduction method by F. Nacimiento group. The obtained discharge capacity was about 600 mAh g −1 . Electrodeposited CoSn 2 on Ni foam was fabricated by the coelectroplating method and followed heat‐treatment at 200 °C, toward both high‐energy density lithium and sodium storage …”
Section: Structures Lithiation Mechanism and Electrochemical Performentioning
confidence: 99%