N-doped hollow carbon nanospheres as sulfur hosts for high performance Li-S batteries
| Autor: | Liang Zhan, Yanli Wang, Li-xin Ding, Yan Song, Yongzheng Zhang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Battery (electricity)
Materials science Carbonization Inorganic chemistry technology industry and agriculture chemistry.chemical_element Lithium–sulfur battery General Chemistry Sulfur Tetraethyl orthosilicate chemistry.chemical_compound chemistry Polymerization Electrode General Materials Science Carbon |
| Zdroj: | Carbon. 124:728 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2017.08.048 |
| Popis: | SiO2@C nanospheres were fabricated by polymerization of dopamine in the presence of tetraethyl orthosilicate followed by carbonization and the SiO2 was chemically etched away to obtain hollow N-doped carbon nanospheres (N-CNs) to host sulfur. The resulting material (S@N-CNs) was used as the cathode material of a Li-S battery. Results indicate that the S@N-CNs can effectively suppress the volume expansion of sulfur and the shuttle effect of polysulfides during charge and discharge. Nitrogen doping improves the electrical conductivity of the N-CNs. The initial reversible capacity of the S@N-CN electrode at 0.2 C is 1 179 mAh·g-1, which remains at 540 mAh·g-1 after 100 cycles. The electrode has excellent rate capability (343 mAh·g-1 at 1 C and 247 mAh·g-1 at 2 C). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect