A typical NASICON type cathode material,Na_(3)V_(2)(PO_(4))_(3)(NVP)has been widely studied in the field of sodium-ion batteries(SIBs),which possesses a suitable price,an ideal specific capacity,and an excellent cycli...A typical NASICON type cathode material,Na_(3)V_(2)(PO_(4))_(3)(NVP)has been widely studied in the field of sodium-ion batteries(SIBs),which possesses a suitable price,an ideal specific capacity,and an excellent cycling stability.However,its low ionic/electronic conductivity has become a major factor hindering its development.In the present study,carbon and nitrogen co-doped NVP(NVP/CN)composites are synthesized by adding C_(3)NH_(6)source using a simple preparation method.The carbon and nitrogen co-doping is intended to introduce lattice defects,which enhances the electrical conductivity of the material and facilitates the diffusion of Na^(+) and e-.Comprehensively,the co-coated NVP cathode material show more excellent electrochemical performance when the N source addition of nC_(3)NH_(6):nNVP=2(NVP/CN-2).NVP/CN-2 has an initial discharge specific capacity of 111.5 mAh/g,and a capacity retention rate of 97.57%after 1000 charge/discharge cycles.The diffusion coefficient of sodium ions is relatively high and can reach 4.74×10^(-10)cm^(2)s^(-1)by CV fitting,so the modified NVP/CN samples are expected to be promising cathode materials for sodium-ion batteries.展开更多
文摘A typical NASICON type cathode material,Na_(3)V_(2)(PO_(4))_(3)(NVP)has been widely studied in the field of sodium-ion batteries(SIBs),which possesses a suitable price,an ideal specific capacity,and an excellent cycling stability.However,its low ionic/electronic conductivity has become a major factor hindering its development.In the present study,carbon and nitrogen co-doped NVP(NVP/CN)composites are synthesized by adding C_(3)NH_(6)source using a simple preparation method.The carbon and nitrogen co-doping is intended to introduce lattice defects,which enhances the electrical conductivity of the material and facilitates the diffusion of Na^(+) and e-.Comprehensively,the co-coated NVP cathode material show more excellent electrochemical performance when the N source addition of nC_(3)NH_(6):nNVP=2(NVP/CN-2).NVP/CN-2 has an initial discharge specific capacity of 111.5 mAh/g,and a capacity retention rate of 97.57%after 1000 charge/discharge cycles.The diffusion coefficient of sodium ions is relatively high and can reach 4.74×10^(-10)cm^(2)s^(-1)by CV fitting,so the modified NVP/CN samples are expected to be promising cathode materials for sodium-ion batteries.
