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Germanium tin alloy nanowires as anode materials for high performance Li-ion batteries

Doherty, Jessica; McNulty, David; Biswas, Subhajit; Moore, Kalani; Conroy, Michele; Bangert, Ursel; O'Dwyer, Colm; Holmes, Justin D.


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  "description": "<p><strong>Abstract</strong><br>\nThe combination of two active Li-ion materials (Ge and Sn) can result in improved conduction paths and higher capacity retention. Here we report for the first time, the implementation of Ge<sub>1&ndash;x</sub>Sn<sub>x</sub> alloy nanowires as anode materials for Li-ion batteries. Ge<sub>1&minus;x</sub>Sn<sub>x</sub> alloy nanowires have been successfully grown via vapor&ndash;liquid&ndash;solid technique directly on stainless steel current collectors. Ge<sub>1&minus;x</sub>Sn<sub>x</sub> (x = 0.048) nanowires were predominantly seeded from the Au<sub>0.80</sub>Ag<sub>0.20</sub> catalysts with negligible amount of growth was also directly catalyzed from stainless steel substrate. The electrochemical performance of the the Ge<sub>1&minus;x</sub>Sn<sub>x</sub> nanowires as an anode material for Li-ion batteries was investigated via galvanostatic cycling and detailed analysis of differential capacity plots (DCPs). The nanowire electrodes demonstrated an exceptional capacity retention of 93.4% from the 2nd to the 100th charge at a C/5 rate, while maintaining a specific capacity value of &sim;921 mAh g&minus;1 after 100 cycles. Voltage profiles and DCPs revealed that the Ge<sub>1&minus;x</sub>Sn<sub>x</sub> nanowires behave as an alloying mode anode material, as reduction/oxidation peaks for both Ge and Sn were observed, however it is clear that the reversible lithiation of Ge is responsible for the majority of the charge stored.</p>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "University College Cork, Ireland", 
      "@type": "Person", 
      "name": "Doherty, Jessica"
    }, 
    {
      "affiliation": "University College Cork, Ireland", 
      "@type": "Person", 
      "name": "McNulty, David"
    }, 
    {
      "affiliation": "University College Cork, Ireland", 
      "@type": "Person", 
      "name": "Biswas, Subhajit"
    }, 
    {
      "affiliation": "University of Limerick, Ireland", 
      "@type": "Person", 
      "name": "Moore, Kalani"
    }, 
    {
      "affiliation": "University of Limerick, Ireland", 
      "@type": "Person", 
      "name": "Conroy, Michele"
    }, 
    {
      "affiliation": "University of Limerick, Ireland", 
      "@type": "Person", 
      "name": "Bangert, Ursel"
    }, 
    {
      "affiliation": "University College Cork, Ireland", 
      "@type": "Person", 
      "name": "O'Dwyer, Colm"
    }, 
    {
      "affiliation": "University College Cork, Ireland", 
      "@type": "Person", 
      "name": "Holmes, Justin D."
    }
  ], 
  "url": "https://zenodo.org/record/3676445", 
  "datePublished": "2020-01-28", 
  "keywords": [
    "Nanowire, Germanium-tin, Li-Ion Battery"
  ], 
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  "identifier": "https://doi.org/10.1088/1361-6528/ab6678", 
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  "name": "Germanium tin alloy nanowires as anode materials for high performance Li-ion batteries"
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