| Summary: | A prismatic type layered Na<sub>2/3</sub>Ni<sub>1/3</sub>Mn<sub>2/3</sub>O<sub>2</sub> cathode material for a sodium ion battery is prepared via two different methods viz., the solid state and sol−gel method with dissimilar surface morphology and a single phase crystal structure. It shows tremendous electrochemical chattels when studied as a cathode for a sodium-ion battery of an initial specific discharge capacity of 244 mAh g<sup>−1</sup> with decent columbic efficiency of 98% up to 250 cycles, between the voltage range from 1.8 to 4.5 V (Na<sup>+</sup>/Na) at 0.1 C under room temperature. It is much higher than its theoretical value of 173 mAh g<sup>−1</sup> and also than in the earlier reports (228 m Ah g<sup>−1</sup>). The full cell containing this material exhibits 800 mAh g<sup>−1</sup> at 0.1 C and withstands until 1000 cycles with the discharge capacity of 164 mAh g<sup>−1</sup>. The surpassing capacity was expected by the anionic (oxygen) redox process, which elucidates the higher capacity based on the charge compensation phenomenon.
|
|---|
