期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 28, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901205
关键词
3D framework; interfacial resistance; monolithic architecture; sodium batteries; solid-state electrolytes
类别
资金
- National Natural Science Foundation of China [51672029, 51372271]
- National Key R&D Project from Ministry of Science and Technology, China [2016YFA0202702]
- Spanish Ministry of Science and Innovation [MAT2017-84496-R]
- China Postdoctoral Science Foundation [2018M631416]
Solid-state sodium batteries (SSSBs) are promising electrochemical energy storage devices due to their high energy density, high safety, and abundant resource of sodium. However, low conductivity of solid electrolyte as well as high interfacial resistance between electrolyte and electrodes are two main challenges for practical application. To address these issues, pure phase Na3Zr2Si2PO12 (NZSP) materials with Ca2+ substitution for Zr4+ are synthesized by a sol-gel method. It shows a high ionic conductivity of more than 10(-3) S cm(-1) at 25 degrees C. Moreover, a robust SSSB is developed by integrating sodium metal anodes into NZSP-type monolithic architecture, forming a 3D electronic and ionic conducting network. The interfacial resistance is remarkably reduced and the monolithic symmetric cell displays stable sodium platting/striping cycles with low polarization for over 600 h. Furthermore, by combining sodium metal anode with Na3V2(PO4)(3) cathode, an SSSB is demonstrated with high rate capability and excellent cyclability. After 450 cycles, the capacity of the cell is still kept at 94.9 mAh g(-1) at 1 C. This unique design of monolithic electrolyte architecture provides a promising strategy toward realizing high-performance SSSBs.
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