Role of Lithium Doping in P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 for Sodium-Ion Batteries
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- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States, Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- ChemMatCARS, University of Chicago c/o APS/ANL, Argonne, Illinois 60439, United States
- X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States, Center for Advanced Energy Studies, Idaho Falls, Idaho 83401, United States
P2-structured Na0.67Ni0.33Mn0.67O2 (PNNMO) is a promising Na-ion battery cathode material, but its rapid capacity decay during cycling remains a hurdle. Li doping in layered transition-metal oxide (TMO) cathode materials is known to enhance their electrochemical properties. Nevertheless, the influence of Li at different locations in the structure has not been investigated. Here, the crystallographic role and electrochemical impact of lithium on different sites in PNNMO is investigated in LixNa0.67–yNi0.33Mn0.67O2+δ (0.00 ≤ x ≤ 0.2, y = 0, 0.1). Lithium occupancy on prismatic Na sites is promoted in Nadeficient (Na < 0.67) PNNMO, evidenced by ex situ and operando synchrotron X-ray diffraction, X-ray absorption spectroscopy, and 7Li solid-state nuclear magnetic resonance. Partial substitution of Na with Li leads to enhanced stability and slightly increased specific capacity compared to PNNMO. In contrast, when lithium is located primarily on octahedral TM sites, capacity is increased but at the cost of stability.
- Research Organization:
- Boise State Univ., ID (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- SC0019121; NSF/CHE-1834750; AC02-06CH11357
- OSTI ID:
- 1785752
- Alternate ID(s):
- OSTI ID: 1787303; OSTI ID: 1798051; OSTI ID: 1798053
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Vol. 33 Journal Issue: 12; ISSN 0897-4756
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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