摘要
通过改进传统热干燥法,将冷冻干燥技术成功应用于溶胶-凝胶法中,制备新型水系钠离子电池正极材料Na_(0.44)MnO_(2),并对两种方法制备样品的结构、形貌以及电化学性能进行对比研究。X-射线衍射结果表明,通过冷冻干燥法和传统热干燥法制备出的正极材料Na_(0.44)MnO_(2)都有相同的晶体结构,样品衍射峰形尖锐,材料结晶度高。扫描电镜结果表明,与热干燥样品相比,冷冻干燥法合成的样品呈棒状结构,大小更均匀,团聚程度很低。透射电镜结果表明,冷冻干燥法制备的样品为结构规整的长方体棒状结构,大小为400 nm左右。在电化学性能方面,冷冻干燥法制备的正极材料Na_(0.44)MnO_(2)表现出更为满意的结果,其电化学活性更高,倍率性能和循环性能更优异,并且可逆性好。
The traditional thermal drying method was improved,and the freeze-drying technology was successfully applied to the sol-gel method to prepare Na_(0.44)MnO_(2)as cathode material for novel aqueous sodium ion batteries.Its structure,morphology and performance were compared with the same materials synthesized by traditional thermal drying method.XRD results showed that the cathode materials prepared by freeze-drying method had the same crystal structure,the diffraction peak of the sample was sharp,and the crystallinity of the material was high compared to the thermal drying sample.SEM indicated that the size of the rod-like structure of the samples synthesized by the freeze-drying technique was more uniform and the degree of agglomeration was very low compared to the thermal sample.TEM results showed that the sample prepared by freezing-drying method was a rectangular bar structure with regular structure and the size was around 400 nm.Electrochemical test results indicated that the cathode material Na_(0.44)MnO_(2)by freezing-drying method exhibited more satisfactory results,the materials with the former method has higher more electrochemical activity,show better rate capability and cyclability,and good reversibility.
作者
党铭铭
刘民华
郭永艳
田雁飞
DANG Ming-ming;LIU Min-hua;GUO Yong-yan;TIAN Yan-fei(Department of Resources and Envi-ronment,Hunan Nonferrous Metals Vocational and Technical College,Zhuzhou 412000,China;Hunan Research Institute of Chemical Industry Co.,Ltd.,Changsha 410014,China)
出处
《化学试剂》
CAS
北大核心
2021年第10期1342-1347,共6页
Chemical Reagents
基金
湖南海利新材料科技创新创业团队项目(2020年)
湖南省有色金属管理局直属单位转型发展项目(2018年)。
作者简介
党铭铭(1986-),女,陕西安康人,硕士,讲师,主要从事有机合成、新材料合成及分析检测研究;通讯作者:田雁飞,E-mail:454054746@qq.com。
