Mg-Li共掺杂优化钠离子电池正极材料P2-Na0.67Ni0.33Mn0.67O2的电化学性能
陈言 , 沈培智 , 白志钟 , 赵红利
现代化工 ›› 2025, Vol. 45 ›› Issue (10) : 240 -246.
Mg-Li共掺杂优化钠离子电池正极材料P2-Na0.67Ni0.33Mn0.67O2的电化学性能
Mg-Li co-doping for optimizing electrochemical performance of P2-Na0.67Ni0.33Mn0.67O2 cathode material of sodium-ion battery
采用液相沉淀-高温烧结法制备P2-Na0.67Ni0.33Mn0.67O2及其Mg-Li共掺杂样品Na0.67Ni0.26-x-yMgxLiyMn0.67O2(x=0.05~0.07,y=0.03~0.05)。实验结果表明,Na0.67Ni0.22Mg0.07Li0.04Mn0.67O2表现出高比容量、良好的循环稳定性以及优异的倍率性能。在1 C下,放电比容量达130.1 mAh/g,经过200次充放电,容量保持率为77.2%。此外,利用恒电流间歇滴定技术、电化学阻抗以及非原位X射线衍射技术,深入探讨了其在充放电过程中的电化学反应机制。
P2-Na0.67Ni0.33Mn0.67O2 and its Mg-Li co-doped samples Na0.67Ni0.26-x-yMgxLiyMn0.67O2 (x=0.05-0.07,y=0.03-0.05) are synthesized through liquid phase precipitation-high temperature sintering method.Experimental results indicate that Na0.67Ni0.22Mg0.07Li0.04Mn0.67O2 exhibits high specific capacity,good cycle stability and excellent rate performance.Specifically,its discharge specific capacity reaches 130.1 mAh/g at 1 C,and its capacity retention rate is 77.2% after 2 000 cycles.In addition,the electrochemical reaction mechanism during the charge-discharge process is explored by means of galvanostatic intermittent titration (GITT),electrochemical impedance (EIS) and ex-situ XRD.
钠离子电池 / P2-Na2/3Ni1/3Mn2/3O2 / Mg-Li共掺杂 / 层状氧化物正极材料
sodium-ion battery / P2-Na2/3Ni1/3Mn2/3O2 / Mg-Li co-doping / layered oxides cathode material
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