Realizing a highly stable sodium battery with dendrite-free sodium metal composite anodes and O3-type cathodes
| Autor: | Peng-Fei Wang, Cao-Yu Wang, Zijian Zheng, Ya-Xia Yin, Huan Ye, Tong-Tong Zuo, Ping Wang, Fei-Fei Cao, Jian Cheng, Yu-Guo Guo |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Sodium Nucleation chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Anode law.invention Metal chemistry Chemical engineering law visual_art visual_art.visual_art_medium General Materials Science Electrical and Electronic Engineering 0210 nano-technology Faraday efficiency |
| Zdroj: | Nano Energy. 48:369-376 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2018.03.069 |
| Popis: | Room-temperature Na metal batteries have been regarded as promising candidates for energy storage systems due to their high energy density and the widespread availability of low cost sodium. However, the practical application of metallic sodium anode is impeded by its low stripping/plating efficiency and poor cycling performance due to the poor reversibility of sodium anode caused by the formation of inhomogeneous solid electrolyte interphase, the growth of dendritic sodium, and relatively infinite volume change. Here, Na-C composite anode was fabricated by depositing nanoscale metallic sodium in graphitized carbon microspheres which were assembled from graphitized carbon nanosheets. The carbon microspheres function as a mini-nanoreservoir with high-surface-area, conductivity, and mechanical stability, which lower the local current density, ensure a homogeneous Na nucleation and high electrochemical active of Na, and restrict the volume change. As a result, metallic sodium can be reversibly nondendritic stripped/plated with a high Coulombic efficiency of 99.3% up to 4 mA cm−2 for 4 mA h cm−2. Building upon this dendrite-free anode, we demonstrate a full cell using O3-NaNi0.5Mn0.2Ti0.3O2 cathode to achieve a superior long lifespan of ~100 cycles at high current density of 0.5 C. |
| Databáze: | OpenAIRE |
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