期刊
SMALL
卷 14, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703471
关键词
MoS2; Na3V2(PO4)(3); N; S co-doped 3D porous graphene frameworks; sodium-ion batteries; TiO2
类别
资金
- Fundamental Research Funds for the Central Universities [WK3430000004]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- National Natural Science Foundation of China [51622210, 21373195]
- National Key R&D Program of China [2016YFB0100305]
To develop high-performance sodium-ion batteries (NIBs), electrodes should possess well-defined pathways for efficient electronic/ionic transport. In this work, high-performance NIBs are demonstrated by designing a 3D interconnected porous structure that consists of N, S co-doped 3D porous graphene frameworks (3DPGFs-NS). The most typical electrode materials (i.e., Na3V2(PO4)(3) (NVP), MoS2, and TiO2) are anchored onto the 3DPGFs-NS matrix (denoted as NVP@C@3DPGFs-NS; MoS2@C@3DPGFs-NS and TiO2@C@3DPGFs-NS) to demonstrate its general process to boost the energy density of NIBs. The N, S co-doped porous graphene structure with a large surface area offers fast ionic transport within the electrode and facilitates efficient electron transport, and thus endows the 3DPGFs-NS-based composite electrodes with excellent sodium storage performance. The resulting NVP@C@3DPGFs-NS displays excellent electrochemical performance as both cathode and anode for NIBs. The MoS2@C@3DPGFs-NS and TiO2@C@3DPGFs-NS deliver capacities of 317 mAhg(-1) at 5 Ag-1 after 1000 cycles and 185 mAhg(-1) at 1 Ag-1 after 2000 cycles, respectively. The excellent long cycle life is attributed to the 3D porous structure that could greatly release mechanical stress from repeated Na+ extraction/insertion. The novel structure 3D PGFs-NS provides a general approach to modify electrodes of NIBs and holds great potential applications in other energy st(o)rage fields.
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