Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 6, Pages 3261-3269Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b12692
Keywords
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Funding
- National Natural Science Foundation of China [51577094, 21503112, 21471081]
- Natural Science Foundation of Jiangsu Province of China [BK20140915]
- 100 Talents Program of Nanjing Normal University
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Program of Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
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Rechargeable sodium-ion batteries have lately received considerable attention as an alternative to lithium-ion batteries because sodium resources are essentially inexhaustible and ubiquitous around, the world. Despite recent reports on cathode materials for sodium-ion batteries have shown electrochemical activities close to their lithium-ion counterparts, the major scientific challenge for sodintii-iOn batteries is to exploit efficient anode materials. Herein, We demonstrate that a hybrid material composed of few-layer SnS2 nanosheets sandWiched between reduced graphene oxide (RGO) nanosheets exhibits a high specific capacity of 843 mAh g(-1) (calculated based_ on the mass of SnS2 only) at a current density of 0,1 A and a 98% capacity retention after100 cycles when evaluated =between 0.01 and 2.5 V. Employing ex situ high-resolution transmission electron microscopy,and selected area electron diffiattion techniques, we illustrate the-high specific capacity of our anode through a 3-fold mechanism of intercalation Of sodium ions along the ab-plane of SnS2 nanosheets.and the ' i..thequerit. formation of Na2S2 and' Na15Sn4 thiorigh conversion arid alloy reactions. The existence of RGO nanosheets in the hybrid material functions as a flexible backbone and-high-speed electronic pathways, guaranteeing that an appropriate resilient space buffers the anisotropic dilation of SnS2 nanosheets along the ab-plane and c-axis for stable cycling performance.
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