Формування стабільної аморфної фази у вкритому вуглецем кремнії в умовах глибокого електрохімічного літіювання
Investigation of electrochemical behaviour of the micro- and nanosilicon powders, coated with carbon by physical (mechanical milling) and chemical (pyrolysis) methods, as anodes for Li-ion batteries have been carried out. Unique role of carbon in forming a stable (noncrystalized) amorphous phase in...
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| Datum: | 2010 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | Russisch |
| Veröffentlicht: |
Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine
2010
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| Online Zugang: | https://www.cpts.com.ua/index.php/cpts/article/view/8 |
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| Назва журналу: | Chemistry, Physics and Technology of Surface |
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Chemistry, Physics and Technology of Surface| Zusammenfassung: | Investigation of electrochemical behaviour of the micro- and nanosilicon powders, coated with carbon by physical (mechanical milling) and chemical (pyrolysis) methods, as anodes for Li-ion batteries have been carried out. Unique role of carbon in forming a stable (noncrystalized) amorphous phase in silicon outer region upon deep lithiation has been revealed. The amorphous phase facilitates to enhancing the capacity retention and decreasing the accumulated irreversible capacity of the silicon electrodes. Carbon-coated nanosilicon composite has the reversible capacity 2029 mAh/g, first cycle efficiency 81.3% and capacity retention 90.8% after 100 cycles in the mode: cc/cv (C/2, 5 mV, C/200), cc(C/2, 1.0 V). |
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