Synthesis of Cation Doped P2-Na0.67Ni0.18M0.15Mn0.67O2(M=Cu,Fe,Ti)as Sodium Ion Batteries Cathode
P2-Na0.67Ni0.33Mn0.67O2 is an ideal cathode material for sodium-ion batteries,but it also has issues such as low discharge capacity and the high cost of Ni used.Solid-state synthesis has been used to dope Fe(iron),Ti(titanium),and Cu(copper)elements at the Ni site.The material prepared after doping has good crystallinity and phase purity,with particle sizes between 1-3µm and single-crystal characteristics.Doping with Fe and Ti increases the discharge capacity of the material but reduces its cycling stability and discharge voltage;Cu doping can moderately improve cycling stability without sacrificing capacity and voltage.The prepared Na067Ni0.18Cu0.15Mn0.67O2,from the 25th to the 100th cycle,only has a capacity decay of 2.6％,and at a current density of 400 mA/g,the discharge capacity reaches 63.0 mAh/g,which is 78.5％of that at 50 mA/g.
sodium ion batteriescathode materialsP2-Na0.67 Ni0.33 Mn0.67 O2nickel site doped
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