P2-type Na_0.67Co_0.35Ti_0.20Mn_0.44La_0.01O₂ cathode material with high-rate capability for sodium-ion batteries

Jiantao Tang¹，Yanzhi Wang^1,2，Yanhong Li¹，Jiabin Zhao¹，Lijun Wang¹，Xiduo Yang¹

1. Hebei Key Laboratory of Applied Chemistry,College of Environmental and Chemical Engineering,Yanshan University2. State Key Laboratory of Metastable Material Science and Technology,Yanshan University

摘 要：The substitution of elements has attracted great interest to enhance the electrochemical properties of sodium-ion batteries（SIBs）.Herein,the P2—Na_0.67Co_0.35Ti_0.20Mn_0.45-xLa_xO₂ electrode samples were prepared via a solid-state route.The effect of La³⁺substitution was researched as high-rate SIBs cathode.The Na_0.67Co_0.35Ti_0.20Mn_0.44La_0.01O₂ exhibits a superior initial specific capacity of 162.7 and 125.9 mA h/g after50 cycles at 0.1 C rate,and the initial specific discharge capacity of 115.2 mA h/g with 60.6% capacity retention after 100 cycles at 1 C In addition,the Na_0.67Co_0.35Ti_0.20Mn_0.44La_0.01O₂ sample shows an excellent rate capacity of 91.9 and 60.4 mA·h/g with 46.9% and 50.9% capacity retentions even at 8 C and 10 C rate after100 cycles,respectively.The promising La-substituted P2-type Na_0.67Co_0.35Ti_0.20Mn_0.45-xLa_xO₂ material provides a new strategy for designing high-rate performance of SIBs.

关键词：