The role of Li doping in layered/layered NaxLiyNi0.4Fe0.2Mn0.4O2 intergrowth electrodes for sodium ion batteries

Eric Gabriel, Pengbo Wang, Kincaid Graff, Shelly D. Kelly, Chengjun Sun, Changjian Deng, Inhui Hwang, Jue Liu, Cheng Li, Sarah Kuraitis, Jehee Park, Eungje Lee, Angel Conrado, Julie Pipkin, Max Cook, Stephanie McCallum, Yingying Xie, Zonghai Chen, Kamila M. Wiaderek, Andrey YakovenkoYang Ren, Yuming Xiao, Yuzi Liu, Elton Graugnard, Yan Yan Hu, Dewen Hou, Hui Xiong

Research output: Contribution to journalArticlepeer-review

Abstract

The layered NaTMO2 (TM = Ni, Fe, Mn) materials with the O3-type structure are attractive as positive electrodes for sodium ion batteries because of their high theoretical capacity. Additionally, Li doping in these materials has been shown to offer substantial enhancements to their electrochemical properties by promoting the formation of intergrowth structures, which intimately integrate the substituent phases. However, the influence of the specific Li content on the structural and electrochemical properties of the intergrowth materials requires investigation. Systematic variation of Li content in NaxLiyNi0.4Fe0.2Mn0.4O2 (NFM-Liy) was conducted to identify the role of Li in modification of the intergrowth structure and electrochemical performance. Li contents of 0.15 and greater generate a layered/layered Na-O3/Li-O’3 intergrowth structure. 7Li and 23Na solid-state nuclear magnetic resonance and x-ray absorption spectroscopy identify that when the total solubility for alkali ions in the layered structure is exceeded, Li continues to form the Li-O’3 phase while the excess Na forms residual sodium compounds such as Na2O. Higher Li content is associated with improved capacity retention in the initial cycles from the superior stability of the mechanically linked Na-O3/Li-O’3 structure that suppresses the P3 to OP2 phase transition during charge. However, high Li contents are associated with increased rates of parasitic side reactions that reduce long-term cycling stability. These side reactions are connected to the instability of the cathode-electrolyte interphase, which can be partially mitigated by atomic layer deposition (ALD) coating with alumina, which significantly enhances the capacity retention and Coulombic efficiency. Overall, we find that the layered/layered Na-O3/Li-O’3 intergrowth structure is able to provide structural stability and suppress undesired phase transformations but is overwhelmed by the increased reactivity of the surface if not protected by surface coating.

Original languageEnglish
Article number110556
JournalNano Energy
Volume134
DOIs
StatePublished - Feb 2025

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences program under Award Number DE-SC0019121. E. Gabriel was supported by the DOE Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. ORISE is managed by ORAU under Contract No. DE-SC0014664. K. Graff acknowledges the support by U.S. National Science Foundation (NSF) (grant number DUE- 2111549). S. McCallum acknowledges the National Science Foundation (NSF) REU Site: Materials for Society (Award No. 1950305). This research used resources of the Advanced Photon Source and Center for Nanoscale Materials, a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract DE-AC02-06CH11357, and the Canadian Light Source and its funding partners. Portions of this work were performed at HPCAT (Sector 16), APS, ANL. HPCAT operations are supported by DOE-NNSA's Office of Experimental Sciences. Work at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for U.S. DOE under Contract No. DEAC05\u201300OR22725. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences program under Award Number DE-SC0019121. E. Gabriel was supported by the DOE Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. ORISE is managed by ORAU under Contract No. DE-SC0014664. K. Graff acknowledges the support by U.S. National Science Foundation (NSF) (grant number DUE- 2111549). S. McCallum acknowledges the National Science Foundation (NSF) REU Site: Materials for Society (Award No.1950305). This research used resources of the Advanced Photon Source and Center for Nanoscale Materials, a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract DE-AC02-06CH11357, and the Canadian Light Source and its funding partners. Portions of this work were performed at HPCAT (Sector 16), APS, ANL. HPCAT operations are supported by DOE-NNSA\u2019s Office of Experimental Sciences. Work at ORNL\u2019s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for U.S. DOE under Contract No. DEAC05-00OR22725.

Keywords

  • Intergrowth
  • Layered oxides
  • Lithium doping
  • Positive electrodes
  • Sodium ion batteries
  • Surface coating

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