碳酸锰两步反应制备P2-Na_(0.67)MnO_(2)正极材料及性能  

Preparation and performance of P2-Na_(0.67) MnO_(2) cathodematerials by a two-step reaction from manganese carbonate

作　　者：张庆堂[1] 高鹏飞 王晓梅[2] ZHANG Qingtang;GAO Pengfei;WANG Xiaomei(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,兰州730050 [2]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《功能材料》2025年第4期4010-4015,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(21968016,21466020)。

摘　　要：采用MnCO3为原料,通过两步和一步反应制备P2-Na_(0.67)MnO_(2)正极材料(分别命名为NMO-2,NMO-1),并对合成样品进行结构表征以及电化学性能等测试。研究结果表明,NMO-2和NMO-1的晶粒尺寸分别为51、60 nm,小的晶粒尺寸可缩短钠离子迁移距离,和NMO-1的不规则颗粒不同,NMO-2为明显的一维棒状和二维片状颗粒。当NMO-2作为电池正极时,0.1 C倍率下放电比容量为140 mAh/g,10 C高倍率下放电比容量为71.8 mAh/g,且在0.5 C倍率下循环100次后容量保持率为89.5%。P2-Na_(0.67) MnO_(2) cathode materials,which are designated as NMO-1 and NMO-2,were prepared by one-step and two-step reaction from MnCO 3.The morphology,structure and electrochemical performance of NMO-1 and NMO-2 were investigated.The results indicate that the grain sizes of NMO-2 and NMO-1 are 51 nm and 60 nm,respectively.The smaller grain sizes shorten the sodium ion distance in NMO-2.NMO-2 is one-dimensional rod-like and two-dimensional lamellar particles,while NMO-1 is irregular particles.When used as the cathode for sodium ion battery,NMO-2 delivers a discharge specific capacities of 140 mAh/g at a 0.1 C and 71.8 mAh/g at a high 10 C.Furthermore,the capacity retention rate of NMO-2 was 89.5%after 100 cycles at a 0.5 C rate.

关 键 词：钠离子电池 正极材料 层状氧化物 锰酸钠 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]