Abstract: The present invention belongs to the technical field in sodium ion battery, which includes material synthesis, and discloses a high-entropy cathode material with a chemical formula of Na1-xKxNiyFezMndTimZn1-y-z-d-mO2, wherein 0<x?0.1, 0<y, z, d, and m?1. Its crystallographic structure is a hexagonal system with a space group of R-3m, where the arrangement subsequence of transition metal layers is ABCABC. Ni, Fe, Zn, Mn and Ti elements occupy in a transition metal layer and are arranged in a disordered subsequence; Na and K elements sit in an alkali metal layer and are arranged in a disordered subsequence. The cathode material of this present invention exhibits excellent electrochemical performance with a high specific capacity of 150 mAhg?1 at a high cut-off charge voltage of 4.3V, and the capacity retention of this pouch cell does not decay after 200 cycles.

Abstract: A sodium-ion pouch cell belongs to the technical field of new energy materials and devices. The pouch cell and comprises a cathode piece, a diaphragm, a presodiated anode piece, an electrolyte, a tab and an aluminum plastic film package, and is obtained by sequentially laminating 1 to 30 cathode pieces and 2 to 31 presodiated anode pieces in a Z-shaped manner, adding the electrolyte and packaging, the sodium-ion pouch cell is characterized in that: the cathode piece contains an O3 layered oxide cathode material, a chemical formula is NaaNibZncFedMneTi(1-b-c-d-e)O2, 0.8?a?1, 0.2<b?0.5, 0<c?0.1, 0<d?0.2, 0.2<e?0.5, the presodiated anode piece contains a hard carbon anode material, and a double-sided density of the cathode piece is 28 mg/cm2 to 33 mg/cm2; and a double-sided density of the anode piece is 14 mg/cm2 to 16 mg/cm2, and a battery capacity is 0.1 Ah to 10 Ah.