Effect of calcination temperature on a P-Type Na_0.6Mn_0.65Ni_0.25Co_0.10O₂ cathode material for Sodium-Ion batteries

Unstable and deficient supplies of lithium resources have led to the development of alternative battery systems such as sodiumion batteries. Herein, P-Type Na_0.6Mn_0.65Ni_0.25Co_0.10O₂ cathode materials were synthesized by a co-precipitation and solid-state reaction method. When the calcination temperature was changed from 700 to 1000?C, Na_0.6Mn_0.65Ni_0.25Co_0.10O₂ had a different morphology and crystalline structure; however, a P3-Type structure was formed only at 700?C, and P2-Type structured cathodes could be obtained at 800, 900, and 1000?C. Their electrochemical performances were evaluated with 2032 coin-Type half cells. Among them, the P2-Type cathode calcinated at 900?C, exhibited a high specific discharge capacity of 148 mAh g^-1, and a stable cycling performance at a 0.2 C rate for 150 cycles.