NaMnV(PO) (NMVP) has gained attention for its high redox potential, good cycling stability, and competitive price but suffers from poor intrinsic electronic conductivity and Jahn-Teller effect from Mn. In this work, cation/anion doping strategy was used for bioderived carbon-coated NMVP (NMVP/AN) to improve the structural stability and electrochemical performance, where Al doping inhibited the dissolution of Mn and enhanced the Mn/Mn redox pair activity; besides, F doping not only weakens the Na-O bond but also endows the hierarchical and porous structure of NMVP/AN, which led to a more rapid and fluid transfer of Na. The elaborately designed NaMnAlV(PO)/AN (NMAVP/AN) exhibits 105.9 mA h g at 0.5 C, and the as-prepared NaMnV(POF)/AN (NMVPF/AN) delivers 104.1 mA h g at 5 C. Further demonstration of the hard carbon//NMAVP/AN full cell manifests the good potential of Al-doped NMVP/AN for practical applications (100.6 mA h g at 1 C). These findings open up the possibility of unlocking the high-performance Na superionic conductor (NASICON).
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Cation/Anion Doping Strategy for NaMnV(PO) with High Energy Density and Long Cycling Life through Construction by .
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Institute of Blood Transfusion, Chinese Academy of Medical Sciences, Chengdu 610052, China.
NaMnV(PO) (NMVP) has gained attention for its high redox potential, good cycling stability, and competitive price but suffers from poor intrinsic electronic conductivity and Jahn-Teller effect from Mn. In this work, cation/anion doping strategy was used for bioderived carbon-coated NMVP (NMVP/AN) to improve the structural stability and electrochemical performance, where Al doping inhibited the dissolution of Mn and enhanced the Mn/Mn redox pair activity; besides, F doping not only weakens the Na-O bond but also endows the hierarchical and porous structure of NMVP/AN, which led to a more rapid and fluid transfer of Na. The elaborately designed NaMnAlV(PO)/AN (NMAVP/AN) exhibits 105.
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