期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-12939-3
关键词
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资金
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0010286]
- NSF [DMREF-1627583]
- DOE Office of Science [DE-AC02-06CH11357]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy [DE-AC05-00OR22725]
- Oak Ridge National Laboratory
- U.S. Department of Energy (DOE) [DE-SC0010286] Funding Source: U.S. Department of Energy (DOE)
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.
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