Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003699
Keywords
3D structure; dendrites; electric fields; sodiophilic; sodium metal anodes
Categories
Funding
- National Natural Science Foundation of China [51772257]
- Major Basic Research Project of Shandong Natural Science Foundation, China [ZR2018ZC1459]
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The oxygen-containing carbonized coconut framework (O-CCF) with a 3D tubular structure is designed to inhibit dendrite growth, enabling stable Na stripping/plating over 10,000 cycles. The oxygen functional groups contribute to the adsorption of Na+ and reduce the Na nucleation energy on the surface of O-CCF.
Although extensive efforts have been made to stabilize metal sodium anodes and prevent dendrite formation, it is still difficult to achieve long-term stability at large area capacity and high current density due to a series of complex failure modes, including uneven Na nucleation and subsequent dendrite formation. Herein, an oxygen-containing carbonized coconut framework (O-CCF) with a 3D tubular structure is designed to inhibit dendrite growth. The 3D tubular structure can regulate the uniform distribution of electric field, making Na+ diffuse evenly on the electrode surface. The oxygen functional groups with sodiophilicity contribute to the adsorption of Na+ and reduce the Na nucleation energy on the surface of O-CCF. The interaction of 3D tubular structure and oxygen functional groups enable Na stripping/plating over 10 000 cycles at 50 mA cm(-2), as well as cycling stably for 1000 cycles with coulombic efficiency of 99.6% at 5 mA cm(-2) and high areal capacity of 10 mAh cm(-2). As a proof of concept, full cells of O-CCF//Na-Na3V2(PO4)(3) (NVP) and Na-O-CCF//Fe7S8 are assembled and exhibit outstanding electrochemical performance. This work presents a promising strategy for fabrication of safe Na metal anodes.
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