Synthesis and Characterizations of Na4MnCr(PO4)3/rGO as NASICON-Type Cathode Materials for Sodium-ion Batteries

NASICON-type Na4MnCr(PO4)3 (NMCP) wrapped with reduced graphene oxide (rGO) was synthesized via a simple sol-gel method as composite cathode material Na4MnCr(PO4)3/rGO (NMCP/rGO) for Na ion batteries. The surface morphology, crystal structure and pore size distribution of pristine NMCP and as-synthe...

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Bibliographic Details
Published inPolymers Vol. 14; no. 19; p. 4046
Main Authors Hsu, Bing-Hsuan, Liu, Wei-Ren
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 27.09.2022
MDPI
Subjects
Acids
Cathodes
Crystal structure
Electrochemical analysis
Electrode materials
Electrolytes
Electron microscopy
Energy storage
Field emission microscopy
Graphene
Lithium
Nitrates
Photoelectrons
Pore size distribution
Redox reactions
Scanning electron microscopy
Sodium
Sodium-ion batteries
Sol-gel processes
Spectrum analysis
X ray photoelectron spectroscopy
Belgium
United States > US
Japan
Taiwan
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Summary:NASICON-type Na4MnCr(PO4)3 (NMCP) wrapped with reduced graphene oxide (rGO) was synthesized via a simple sol-gel method as composite cathode material Na4MnCr(PO4)3/rGO (NMCP/rGO) for Na ion batteries. The surface morphology, crystal structure and pore size distribution of pristine NMCP and as-synthesized NMCP/rGO composite cathode are identified by X-ray diffraction (XRD), field emission-scanning electron microscopy (SEM), transmission electron microscope (TEM), the Brunauer–Emmett–Teller (BET) method and X-ray photoelectron spectroscopy (XPS). The electrochemical performance of composition-optimized NMCP/rGO composite cathode presents stable capacity retention and rate capability. The capacity retention of as-synthesized NMCP/rGO composite is 63.8%, and average coulombic efficiency maintains over 98.7% for 200 cycles. The reversible capacity of as-synthesized NMCP/rGO composite cathode still retained 45 mAh/g and 38 mAh/g under a current density of 0.5 A/g and 1.0 A/g, respectively, which was better than that of pristine NMCP, with only 6 mAh/g and 4 mAh/g. The redox reactions of pristine NMCP and as-synthesized NMCP/rGO composite are studied via cyclic voltammetry. The improved electronic conductivity and structure stability of bare NMCP is attributed to the contribution of the rGO coating.
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ISSN:2073-4360
2073-4360
DOI:10.3390/polym14194046