Synthesis and characterization of Na-substituted LiMnPO^sub 4^ as a cathode material for improved lithium ion batteries

The present study, report the sodium (Na) substituted lithium (Li) in LiMnPO4/C structure as an active material for lithium-ion batteries, and its effect on structure, morphology and electrochemical performances. Sodium with different concentrations has been substituted in the LiMnPO4 system using t...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-02, Vol.775, p.836
Main Authors: Khalfaouy, Redouan El, Addaou, Abdellah, Laajeb, Ali, Lahsini, Ahmed
Format: Article
Language:English
Subjects:
Batteries
Cathodes
Chemical synthesis
Discharge
Efficiency
Electrode materials
Ions
Lithium compounds
Lithium-ion batteries
Morphology
Phosphates
Rechargeable batteries
Sodium
Substitutes
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Summary:The present study, report the sodium (Na) substituted lithium (Li) in LiMnPO4/C structure as an active material for lithium-ion batteries, and its effect on structure, morphology and electrochemical performances. Sodium with different concentrations has been substituted in the LiMnPO4 system using the solution combustion method. The XRD analysis confirmed a pure orthorhombic structure well indexed, which confirms a good substitution of Li+ ions by Na+. A maximum discharge capacity of 136.7 mAh g−1 was achieved for Li0.97Na0.03MnPO4/C composite cathode material compared to LiMnPO4/C (126.9 mAh g−1) with a coulombic efficiency of 93.8% higher than that of LiMnPO4/C (82.3%). It can be observed that the irreversible loss of capacity has been reduced by adding sodium (x = 0.03) Li0.97Na0.03MnPO4/C compared to LiMnPO4/C. With remarkable stability achieved, for the three doped samples (x = 0.01, 0.03 and 0.05 compared to x = 0.00), during the charge/discharge process.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.10.161