Structural and Electrochemical Sodium (De)intercalation Properties of Carbon?Coated NASICON?Na <sub> 3+ <i>y</i> </sub> V <sub> 2? <i>y</i> </sub> Mn <sub> <i>y</i> </sub> (PO <sub>4</sub> ) <sub>3</sub> Cathodes for Na?Ion Batteries
نویسندگان
چکیده
Mixed vanadium-/manganese-based NASICON cathodes are attractive for practical sodium-ion battery application due to their low cost and toxicity. Although the previous reports demonstrate remarkable performances of bulk Na3+yV2?yMny(PO4)3 cathodes, full utilization is limited by lower electronic conductivities longer Na-ion diffusion lengths. To overcome this issue, herein, structural electrochemical Na (de)intercalation properties carbon-coated nanoscale NASICON-Na3+yV2?yMny(PO4)3 investigated. The Mn-rich display enhanced cycling stabilities (90% retention after 100 cycles) rate (100 mAh g?1 at 5C) compared with counterparts in low-voltage window (3.8–2.75 V) efficient carbon coating particle nanosizing. Upon extending voltage 4.2–2.75 V, Mn-lean show better capacity (?100 50 cycles 1C) whereas undergo irreversibility rapid fading. operando X-ray diffraction ex situ absorption studies shed insights on (ir)reversibility redox activities upon different windows.
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ژورنال
عنوان ژورنال: Advanced energy and sustainability research
سال: 2022
ISSN: ['2699-9412']
DOI: https://doi.org/10.1002/aesr.202200081