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A mixed iron-manganese based pyrophosphate cathode, Na2Fe0.5Mn0.5P2O7, for rechargeable sodium ion batteries.
Phys Chem Chem Phys. 2016 Feb 07; 18(5):3929-35.PC

Abstract

The development of secondary batteries based on abundant and cheap elements is vital. Among various alternatives to conventional lithium-ion batteries, sodium-ion batteries (SIBs) are promising due to the abundant resources and low cost of sodium. While there are many challenges associated with the SIB system, cathode is an important factor in determining the electrochemical performance of this battery system. Accordingly, ongoing research in the field of SIBs is inclined towards the development of safe, cost effective cathode materials having improved performance. In particular, pyrophosphate cathodes have recently demonstrated decent electrochemical performance and thermal stability. Herein, we report the synthesis, electrochemical properties, and thermal behavior of a novel Na2Fe0.5Mn0.5P2O7 cathode for SIBs. The material was synthesized through a solid state process. The structural analysis reveals that the mixed substitution of manganese and iron has resulted in a triclinic crystal structure (P1[combining macron] space group). Galvanostatic charge/discharge measurements indicate that Na2Fe0.5Mn0.5P2O7 is electrochemically active with a reversible capacity of ∼80 mA h g(-1) at a C/20 rate with an average redox potential of 3.2 V. (vs. Na/Na(+)). It is noticed that 84% of initial capacity is preserved over 90 cycles showing promising cyclability. It is also noticed that the rate capability of Na2Fe0.5Mn0.5P2O7 is better than Na2MnP2O7. Ex situ and CV analyses indicate that Na2Fe0.5Mn0.5P2O7 undergoes a single phase reaction rather than a biphasic reaction due to different Na coordination environment and different Na site occupancy when compared to other pyrophosphate materials (Na2FeP2O7 and Na2MnP2O7). Thermogravimetric analysis (25-550 °C) confirms good thermal stability of Na2Fe0.5Mn0.5P2O7 with only 2% weight loss. Owing to promising electrochemical properties and decent thermal stability, Na2Fe0.5Mn0.5P2O7, can be an attractive cathode for SIBs.

Authors+Show Affiliations

Center for Advanced Materials (CAM), Qatar University, Doha 2713, Qatar. shakoor@qu.edu.qa.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26765283

Citation

Shakoor, Rana A., et al. "A Mixed Iron-manganese Based Pyrophosphate Cathode, Na2Fe0.5Mn0.5P2O7, for Rechargeable Sodium Ion Batteries." Physical Chemistry Chemical Physics : PCCP, vol. 18, no. 5, 2016, pp. 3929-35.
Shakoor RA, Park CS, Raja AA, et al. A mixed iron-manganese based pyrophosphate cathode, Na2Fe0.5Mn0.5P2O7, for rechargeable sodium ion batteries. Phys Chem Chem Phys. 2016;18(5):3929-35.
Shakoor, R. A., Park, C. S., Raja, A. A., Shin, J., & Kahraman, R. (2016). A mixed iron-manganese based pyrophosphate cathode, Na2Fe0.5Mn0.5P2O7, for rechargeable sodium ion batteries. Physical Chemistry Chemical Physics : PCCP, 18(5), 3929-35. https://doi.org/10.1039/c5cp06836c
Shakoor RA, et al. A Mixed Iron-manganese Based Pyrophosphate Cathode, Na2Fe0.5Mn0.5P2O7, for Rechargeable Sodium Ion Batteries. Phys Chem Chem Phys. 2016 Feb 7;18(5):3929-35. PubMed PMID: 26765283.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A mixed iron-manganese based pyrophosphate cathode, Na2Fe0.5Mn0.5P2O7, for rechargeable sodium ion batteries. AU - Shakoor,Rana A, AU - Park,Chan Sun, AU - Raja,Arsalan A, AU - Shin,Jaeho, AU - Kahraman,Ramazan, Y1 - 2016/01/14/ PY - 2016/1/15/entrez PY - 2016/1/15/pubmed PY - 2016/1/15/medline SP - 3929 EP - 35 JF - Physical chemistry chemical physics : PCCP JO - Phys Chem Chem Phys VL - 18 IS - 5 N2 - The development of secondary batteries based on abundant and cheap elements is vital. Among various alternatives to conventional lithium-ion batteries, sodium-ion batteries (SIBs) are promising due to the abundant resources and low cost of sodium. While there are many challenges associated with the SIB system, cathode is an important factor in determining the electrochemical performance of this battery system. Accordingly, ongoing research in the field of SIBs is inclined towards the development of safe, cost effective cathode materials having improved performance. In particular, pyrophosphate cathodes have recently demonstrated decent electrochemical performance and thermal stability. Herein, we report the synthesis, electrochemical properties, and thermal behavior of a novel Na2Fe0.5Mn0.5P2O7 cathode for SIBs. The material was synthesized through a solid state process. The structural analysis reveals that the mixed substitution of manganese and iron has resulted in a triclinic crystal structure (P1[combining macron] space group). Galvanostatic charge/discharge measurements indicate that Na2Fe0.5Mn0.5P2O7 is electrochemically active with a reversible capacity of ∼80 mA h g(-1) at a C/20 rate with an average redox potential of 3.2 V. (vs. Na/Na(+)). It is noticed that 84% of initial capacity is preserved over 90 cycles showing promising cyclability. It is also noticed that the rate capability of Na2Fe0.5Mn0.5P2O7 is better than Na2MnP2O7. Ex situ and CV analyses indicate that Na2Fe0.5Mn0.5P2O7 undergoes a single phase reaction rather than a biphasic reaction due to different Na coordination environment and different Na site occupancy when compared to other pyrophosphate materials (Na2FeP2O7 and Na2MnP2O7). Thermogravimetric analysis (25-550 °C) confirms good thermal stability of Na2Fe0.5Mn0.5P2O7 with only 2% weight loss. Owing to promising electrochemical properties and decent thermal stability, Na2Fe0.5Mn0.5P2O7, can be an attractive cathode for SIBs. SN - 1463-9084 UR - https://www.unboundmedicine.com/medline/citation/26765283/A_mixed_iron_manganese_based_pyrophosphate_cathode_Na2Fe0_5Mn0_5P2O7_for_rechargeable_sodium_ion_batteries_ L2 - https://doi.org/10.1039/c5cp06836c DB - PRIME DP - Unbound Medicine ER -
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