摘要
钠离子电池作为可替代锂离子电池的下一代电池,具有独特优势,然而要开发出低成本、良好可逆性和长循环寿命的电极材料仍然存在许多技术难题。本文通过简单的共沉淀法合成Ni_(0.4)^(Ⅱ)Fe_(0.2)^(Ⅱ)Mn_(0.4)^(Ⅱ)(OH)_(2)前驱体,再在空气气氛下加入碳酸钠进行煅烧,制备得到用于钠离子电池的NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)正极材料。利用X射线衍射(XRD)和扫描电镜(SEM)表征材料的物相结构,结果表明制备的材料是典型的层状斜方六面体结构,部分材料呈现单晶特征。采用恒流充放电的测试方法表征材料的电化学性能。在0.1 C的电流密度下,该材料的初始充电容量可达141.9 mAh/g,放电容量为140.0 mAh/g,首次库仑效率高达98.7%。此外,在0.2 C、0.5 C、1 C、2 C和3 C的倍率下,该材料的放电比容量分别为129.5 mAh/g、112.6 mAh/g、97.8 mAh/g、82.9 mAh/g和72.8 mAh/g,且在0.5 C下循环100圈后的容量保持率约为70.0%,具有良好的倍率性和一定的循环稳定性。
Sodium ion batteries have unique advantages as the next generation batteries that could replace lithium ion batteries,however,the development of electrode materials with low cost,good reversibility and long cycle life still remains many technical difficulties.NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)cathode material for sodium ion batteries was prepared by a simple co-precipitation synthesis of Ni_(0.4)^(Ⅱ)Fe_(0.2)^(Ⅱ)Mn_(0.4)^(Ⅱ)(OH)_(2)precursor,which was then annealed with Na_(2)CO_(3)in air atmosphere.The WANG H B,XIANG Y N,MENG X W,et al.Preparation and sodium storage of NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)cathode material for sodium ion batteries[J].Chinese Battery Industry,2024,28(2):66-71.structure and morphologies of the as-prepared materials were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).The results showed that the NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)had a typical layered rhombohedral structure and a large portion of the material had a characteristic of single crystal.The electrochemical properties of the NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)material were studied by galvanostatic charge-discharge test.The charge and discharge capacity of the first cycle is 141.9 mAh/g and 140.0 mAh/g at a rate of 0.1 C with an initial coulombic efficiency of 98.7%.In addition,the NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)could deliver discharge capacities of 129.5 mAh/g,112.6 mAh/g,97.8 mAh/g,82.9 mAh/g and 72.8 mAh/g at 0.2 C,0.5 C,1 C,2 C and 3 C rate,respectively.The capacity retention was about 70.0%after 100 cycles at 0.5 C,showing a good rate capability and a limited cyclability.
作者
王洪波
向燕宁
孟小吻
张志磊
WANG Hongbo;XIANG Yanning;MENG Xiaowen;ZHANG Zhilei(School of Materials Science and Engineering,Henan Institute of Technology,Xinxiang,Henan Province,453003,China)
出处
《电池工业》
CAS
2024年第2期66-71,共6页
Chinese Battery Industry
基金
河南省高等学校重点科研项目(20B150005)
河南工学院博士科研启动基金(KQ1849)。
