Please use this identifier to cite or link to this item: https://doi.org/10.1039/c9ta08991h
Title: Developing an O3 type layered oxide cathode and its application in 18650 commercial type Na-ion batteries
Authors: ABHINAV TRIPATHI 
ASHISH RUDOLA 
GAJJELA SATYANARAYANA REDDY 
Xi, Shibo
PALANI BALAYA 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
X-RAY-ABSORPTION
POSITIVE ELECTRODE MATERIAL
HIGH-PERFORMANCE CATHODE
HIGH-CAPACITY CATHODE
LIQUID-METAL BATTERY
ELECTROCHEMICAL PROPERTIES
CRYSTAL-STRUCTURE
PHASE-TRANSITION
ENERGY DENSITY
PRUSSIAN BLUE
Issue Date: 7-Dec-2019
Publisher: Royal Society of Chemistry (RSC)
Citation: ABHINAV TRIPATHI, ASHISH RUDOLA, GAJJELA SATYANARAYANA REDDY, Xi, Shibo, PALANI BALAYA (2019-12-07). Developing an O3 type layered oxide cathode and its application in 18650 commercial type Na-ion batteries. Journal of Materials Chemistry A 7 (45) : 25944-25960. ScholarBank@NUS Repository. https://doi.org/10.1039/c9ta08991h
Abstract: A novel, water-stable and high energy density cathode material Na0.9Cu0.12Ni0.10Fe0.30Mn0.43Ti0.05O2 (NCNFMT) is reported here along with a thorough understanding of structural events during battery operation. Systematic substitutions are carried out, which lead to increase in specific energy densities of this family of cathodes from 274.6 W h kgcathode-1 (NCFM-Na0.9Cu0.22Fe0.30Mn0.48O2) to 304.2 W h kgcathode-1 (NCFMT-Na0.9Cu0.22Fe0.30Mn0.43Ti0.05O2) and finally to 350.7 W h kgcathode-1 (NCNFMT-Na0.9Cu0.12Ni0.10Fe0.30Mn0.43Ti0.05O2). Operando X-ray diffraction reveals phase transformations and ex situ EXAFS shows the evolution of local environments around transition metals during charge/discharge. Monoclinic distortions in the NCFM material during O3-P3 phase transformations are suppressed by Ti4+ substitution leading to improvements in the cycling performance of NCFMT. Cu-O octahedral sites exhibit huge Jahn-Teller distortion: Ni2+ substitution in place of Cu2+ not only leads to more ordered Ni-O, but it also helps extract more Na ions from the O3 cathode structure, thus boosting the capacity while also showing good cycling stability due to the highly reversible bond-length and local environmental changes as revealed by EXAFS analyses. X-ray photoelectron spectroscopy shows a titanium-rich surface for NCFMT and NCNFMT which helps improve water-stability. The capacity retention after 200 cycles at 0.2C is 84%, 96% and 90% for NCFM, NCFMT and NCNFMT respectively. The delivered storage capacities of NCFM, NCFMT and NCNFMT are 21 mA h g-1, 47 mA h g-1 and 60 mA h g-1 respectively at 3C. 18650 type Na-ion batteries using the NCNFMT cathode material against a hard carbon anode are also reported to demonstrate potential scalability of the NCNFMT cathode and efficacy of a 1 M NaBF4 tetraglyme electrolyte system for the first time. 18650 cells deliver a specific energy density of 62 W h kgtotal_18650_weight-1 with 90% energy efficiency, thus being suitable for large scale energy storage applications.
Source Title: Journal of Materials Chemistry A
URI: https://scholarbank.nus.edu.sg/handle/10635/169771
ISSN: 2050-7488
2050-7496
DOI: 10.1039/c9ta08991h
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