Tailoring Hollow Silicon–Carbon Nanocomposites As High-Performance Anodes in Secondary Lithium-Based Batteries through Economical Chemistry
| Autor: | Katja Pinkert, Markus Herklotz, Lars Giebeler, Steffen Oswald, Jürgen Eckert, Tony Jaumann, Markus Klose |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Chemistry of Materials. 27:37-43 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm502520y |
| Popis: | A sustainable synthesis procedure of a rational-designed silicon–carbon electrode for a high-performance rechargeable Li-based battery has been developed. It was realized by an economical approach using low-cost trichlorosilane as feedstock and without special equipment. The synthesis strategy includes polycondensation of trichlorosilane in the presence of a surfactant to selectively form spheric silicon@silica particles via a hydrogen silsesquioxane (HSQ) intermediate. After subsequent carbonization of a sucrose shell and etching the composite, we obtained an anode material based on silicon nanoparticles with 2–5-nm average diameter inside a porous carbon scaffold. The active material exhibits a high rate capability of 2000 mAh/g at a current rate of 0.5 A/g with exceptional cycle stability. After almost 1000 times of deep discharge galvanostatic cycling at 2.5 A/g current rate the capacity is still 60% of the initial 1200 mAh/g. The excellent electrochemical performance is attributed to an interaction o... |
| Databáze: | OpenAIRE |
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