Structural water and disordered structure promote aqueous sodium-ion energy storage in sodium-birnessite
| Autor: | Fenghua Guo, Zachary W. Lebens-Higgins, Xiaowei Teng, Jinpeng Wu, Louis F. J. Piper, Xiaoqiang Shan, Wenqian Xu, Daniel S. Charles, Sara Abdel Razek, Wanli Yang, Mikhail Feygenson, Joerg C. Neuefeind, Katharine Page |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Birnessite Energy science and technology Science Sodium General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Energy storage Affordable and Clean Energy lcsh:Science Shrinkage Multidisciplinary Aqueous solution General Chemistry 021001 nanoscience & nanotechnology Environmentally friendly 0104 chemical sciences Chemical engineering chemistry Electrode lcsh:Q 0210 nano-technology |
| Zdroj: | Nature communications, vol 10, iss 1 Nature Communications, Vol 10, Iss 1, Pp 1-11 (2019) Nature Communications |
| Popis: | Birnessite is a low-cost and environmentally friendly layered material for aqueous electrochemical energy storage; however, its storage capacity is poor due to its narrow potential window in aqueous electrolyte and low redox activity. Herein we report a sodium rich disordered birnessite (Na0.27MnO2) for aqueous sodium-ion electrochemical storage with a much-enhanced capacity and cycling life (83 mAh g−1 after 5000 cycles in full-cell). Neutron total scattering and in situ X-ray diffraction measurements show that both structural water and the Na-rich disordered structure contribute to the improved electrochemical performance of current cathode material. Particularly, the co-deintercalation of the hydrated water and sodium-ion during the high potential charging process results in the shrinkage of interlayer distance and thus stabilizes the layered structure. Our results provide a genuine insight into how structural disordering and structural water improve sodium-ion storage in a layered electrode and open up an exciting direction for improving aqueous batteries. The authors report a sodium rich disordered birnessite cathode material Na0.27MnO2 for aqueous Na-ion storage. The impressive electrochemical performance is attributed to the co-deintercalation of structural water and Na-ion during the high potential charging process which stabilizes the layered structure. |
| Databáze: | OpenAIRE |
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