Synthesis of Erythrocyte‐Like P2‐Type Na0.67Mn0.75Co0.25O2 for Sodium Storage

Abstract

AbstractSodium‐ion batteries are the most promising next‐generation energy storage systems. Nevertheless, low capacity and short cycle life have hindered their industrial production. Herein, we synthesized novel erythrocyte‐like Na0.67Mn0.75Co0.25O2 cathode materials through a simple co‐precipitation and solid‐phase method. The material has an erythrocyte morphology, which is different from the typical angular hexagonal morphology. The Na0.67Mn0.75Co0.25O2 cathode materials have a preeminent discharge capacity of 198 mAh g−1 at 50 mA g−1 within a voltage range of 1.5–4.3 V and superior cycling and rate performance. The superior performance of the cathode materials is ascribed to the erythrocyte‐like morphology and the layered structure that mitigate the stress and expedite the transfer of sodium ions. The Na0.67Mn0.75Co0.25O2 cathode materials with erythrocyte‐like morphology have great potential for industrial production.