A Study of the Performance of Rare Earth Element Doped P2-type Layered Oxide Cathode Material for Sodium Ion Battery
Due to the shortage of lithium resources,sodium-ion batteries have been brought to an increasing attention of people because of their abundant reserves of sodium resources and low price.Among them,P2 type layer oxide is considered to be a promising cathode material.However,the Jahn-Teller effect of Mn3+in P2-Na0.67MnO2 causes phase transitions and structural collapse,resulting in reduced battery life.Therefore,in this study,we used the rare earth elements to make a structure regulation on the ternary ferromanganese layered cathode material by fast microwave assisted method,and get the Sm doped Na0.67Mn0.58Cu0.1Fe0.3Sm0.02O2.The doped ions expand the sodium ion transfer channel,accelerate the diffusion of sodium ions in the electro-chemical reaction process,and improved the rate performance of the material.Under high current density of 1.0 A/g,discharge capacity of Na0.67Mn0.58Cu0.1Fe0.3Sm0.02O2 was much higher than that of the pristine samples.In addition,due to the substitution of Sm and Cu,the Jahn-Teller effect of the material was effectively alleviated during the cycle process,and the cyclic stability of the material was improved.A high capacity retention rate of about 69.8％was obtained under current density of 200 mA/g after 100 cycles.It is proved that the addition of rare earth elements successfully improves the electro-chemical performance of P2-type layered oxide electrode.
rare earth elementsdopingP2 type layered oxidesodium-ion batteries
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维普
