Structural water and disordered structure promote aqueous sodium-ion energy storage in sodium-birnessite

Xiaoqiang Shan, Fenghua Guo, Daniel S. Charles, Zachary Lebens-Higgins, Sara Abdel Razek, Jinpeng Wu, Wenqian Xu, Wanli Yang, Katharine L. Page, Joerg C. Neuefeind, Mikhail Feygenson, Louis F. J. Piper and Xiaowei Teng ()
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Xiaoqiang Shan: University of New Hampshire
Fenghua Guo: University of New Hampshire
Daniel S. Charles: University of New Hampshire
Zachary Lebens-Higgins: Binghamton University
Sara Abdel Razek: Binghamton University
Jinpeng Wu: Lawrence Berkeley National Laboratory
Wenqian Xu: Argonne National Laboratory
Wanli Yang: Lawrence Berkeley National Laboratory
Katharine L. Page: Spallation Neutron Source, Oak Ridge National Laboratory
Joerg C. Neuefeind: Spallation Neutron Source, Oak Ridge National Laboratory
Mikhail Feygenson: Spallation Neutron Source, Oak Ridge National Laboratory
Louis F. J. Piper: Binghamton University
Xiaowei Teng: University of New Hampshire

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-019-12939-3

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