Complementary surface modification by disordered carbon and reduced graphene oxide on SnO2 hollow spheres as an anode for Li-ion battery
| Autor: | Taehyun Hwang, Sangheon Lee, Kimin Park, Jaewook Kim, Hyungsub Woo, Bumjin Gil, Jae-Won Kim, Seunghoon Nam, Jinhyun Kim, Joonhyeon Kang, Sungun Wi, Byungwoo Park |
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| Rok vydání: | 2018 |
| Předmět: |
Battery (electricity)
Materials science Graphene Oxide chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode law.invention chemistry.chemical_compound Coating chemistry Chemical engineering law Electrode engineering Surface modification General Materials Science 0210 nano-technology Carbon |
| Zdroj: | Carbon. 129:342-348 |
| ISSN: | 0008-6223 |
| Popis: | Among the efforts to apply SnO2 as an anode, the adoption of carbonaceous materials has been considered as a decent strategy to mitigate volume expansion problem (∼300%) during cycling. Nevertheless, it still needs in-depth examinations to identify the individual role of each coating material and further improvements for practical applications. To understand the underlying correlations of various carbon coatings with electrochemical performance of active materials, disordered carbon and reduced graphene oxide (RGO) are selectively used for SnO2 hollow spheres. The disordered carbon, which covered the surfaces of and voids between the primary particles, acts as a buffer layer for volume expansion, and the RGO, that interconnected the hollow secondary particles, provides a 2D-electronic path to the electrode. Finally, both of them are utilized on the SnO2 hollow spheres, namely the double coating is conducted from the expectation of synergistic effects, and it successfully exhibits a moderate capacity after 100 cycles even at 1 C with a low carbon content (7.7 wt. %). The essential factors that are inherently present and thereby significantly affect the electrochemical performance of the SnO2 electrode are successfully identified by a facile dual-carbon modification, so that this strategy will be applicable to other potential active materials. |
| Databáze: | OpenAIRE |
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