Sandwich-like SnS/N, S co-doped rGO/SnS structure with pseudocapacitance for high-performance Li- and Na–ion batteries
| Autor: | Dong Sun, Naiteng Wu, Liu Xianming, Yingying Zhang, Weiwei Yuan, Jiahao Liu, Guilong Liu, Xiaorui Li, Donglei Guo |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
020502 materials Mechanical Engineering Intercalation (chemistry) Electrochemical kinetics 02 engineering and technology Substrate (electronics) Pseudocapacitance Anode Ion 0205 materials engineering Chemical engineering Mechanics of Materials Electrode General Materials Science Current density |
| Zdroj: | Journal of Materials Science. 55:14477-14490 |
| ISSN: | 1573-4803 0022-2461 |
| Popis: | SnS is considered as a promising anode candidate for next-generation Li- and Na-ion batteries due to its high theoretical capacity and large interlayer distance, which provides excessive space for intercalation of Li- and Na-ions. However, the low electronic conductivity and large volumetric changes during charge/discharge process lead to its poor rate capability and severe capacity degradation. Herein, a sandwich-like SnS/N, S co-doped rGO/SnS structure is delicately tailored by using selective vulcanization and in situ decomposition processes. The unique sandwich-like SnS/rGO/SnS structure provides open channels for ion storage and ameliorates the electrical conductivity. RGO substrate and chemical bonds between SnS and rGO improves the electronic conductivity and furnishes additional ions/electrons transport routes. Moreover, the co-doping of N and S renders abundant sites for ions adsorption, inducing a strong pseudocapacitance effect and favoring fast electrochemical kinetics. Therefore, at the current density of at 1 A g−1, the sandwich-like SnS/rGO/SnS electrode delivered a high reversible capacity of 797.9 mAh g−1 and 359.2 mAh g−1 as an anode material in Li- and Na-ion batteries, respectively. |
| Databáze: | OpenAIRE |
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