Enhanced electrochemical performance of O3-type NaNi0.5Mn0.3Co0.2O2 cathodes for sodium-ion batteries via Al-doping

Kumar, V. Kiran and Ghosh, Shuvajit and Ghosh, Sourav and Behera, P. Suchismita and Biswas, Sanjay and Martha, Surendra Kumar (2022) Enhanced electrochemical performance of O3-type NaNi0.5Mn0.3Co0.2O2 cathodes for sodium-ion batteries via Al-doping. Journal of Alloys and Compounds, 924. pp. 1-10. ISSN 0925-8388

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O3-type NaNi0.5Mn0.3Co0.2O2 based positive electrode materials are very promising for sodium-ion batteries. However, the irreversible phase transition due to structural deformation leads to sluggish kinetics, rapid capacity fade, and low C-rate performance, limiting its wide practical applications. The partial substitution of Co3+ (0.545 Å) by Al3+ (0.535 Å) ions in the transition-metal layer in NaNi0.5Mn0.3Co0.2-xAlxO2 (0.01 ≤ x ≤ 0.02) is an effective strategy to address the issue of structural deformation and thus to improve the electrochemical performance of NaNi0.5Mn0.3Co0.2O2 cathode. Solution combustion synthesis of NaNi0.5Mn0.3Co0.2-xAlxO2 (x = 0.01, 0.02) shows O3-type structure of NaNi0.5Mn0.3Co0.2−xAlxO2 material with the space group of R3¯m. The composition with an overall x = 0.02 Al doping delivers an initial 120 mAh g−1 capacity at a 0.1 C rate. It retains 90 % capacity even after 200 cycles than the other stoichiometric aluminum substitution, x = 0.01 (77 %). Moreover, the NaNi0.5Mn0.3Co0.18Al0.02O2 shows a good capacity of ~ 83 mAh g−1 even at a high C-rate of 5 C, almost 70 % of the initial capacity at the 0.1 C rate. The Al-substitute NaNi0.5Mn0.3Co0.2−xAlxO2 cathode's electrochemical performance is attributed to the enhancement in the structural stability of the sodium layered transition metal oxide after the partial substitution of Co3+ by Al3+ ion. Finally, the practical sodium-ion full cells are realized using a hard carbon-based anode and NaNi0.5Mn0.3Co0.18Al0.02O2 cathode, showing 91 % capacity retention at the end of 100th cycles with an OCV of 3.5 V. © 2022 Elsevier B.V.

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IITH Creators:
IITH CreatorsORCiD
Martha, Surendra Kumarhttps://orcid.org/0000-0002-7762-7237
Item Type: Article
Additional Information: VKK acknowledges UGC-NET, Govt. of India. SG acknowledges DST-International bilateral cooperation division under grant number DST/INT/UK/P-173/2017 for the fellowship, SKM acknowledges Research Center Imarat (DRDO), Hyderabad under grant number RCI/CAAT/8151/CARS-358 for financial support. We thank Shri. K. Rambabu, Dr. T. S. Balasubramanian, Shri D. S. Reddy of RCI (DRDO), and Dr. Pratyay Basak of IICT, Hyderabad for various suggestions.
Uncontrolled Keywords: Al-substitution; Cathode; Electrochemistry; Na-ion battery; NaNi0.5Mn0.3Co0.2O2
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: . LibTrainee 2021
Date Deposited: 01 Sep 2022 07:26
Last Modified: 01 Sep 2022 07:26
URI: http://raiith.iith.ac.in/id/eprint/10371
Publisher URL: http://doi.org/10.1016/j.jallcom.2022.166444
OA policy: https://v2.sherpa.ac.uk/id/publication/13772
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