摘要
通过采用共沉淀法制备了Ni0.8Co0.1Mn0.1(OH)2前驱体,利用固相法研磨混合碳酸锰和碳酸锂,在氧气氛围下煅烧制备得到了Li2Mn O3-Li Ni0.8Co0.1Mn0.1O2复合材料,通过利用X射线衍射(XRD)、场发射扫描电镜(FESEM)和透射电镜(TEM)表征了所制备材料的结构、成分和形貌等。通过恒流充放电、交流阻抗等方法对材料的电化学性能进行测试。结果表明,与未改性材料进行对比,3%(质量分数)Li2Mn O3复合改性材料0.5C下首次放电容量为183 m A·h/g,经过120次充放电循环,容量保持率为93.9%;同时,在高倍率下复合改性材料放电容量也得到提高。因此,采用固相法煅烧复合Li2Mn O3-Li Ni0.8Co0.1Mn0.1O2材料,可以制备出电化学性能优异的正极材料。
A co-precipitation route was utilized to synthesize the precursor of Ni0.8Co0.1Mn0.1(OH)2,which was mixed with MnCO3and Li2CO3afterwards.After calcination in the oxygen atmosphere,Li2MnO3-Li Ni0.8Co0.1Mn0.1O2composite material was obtained.The structure,composition and morphology of the prepared materials were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM)and transmission electron microscopy(TEM),respectively The electrochemical performance of the material was tested by galvanostatic charge/discharge measurements and electrochemical impedance spectroscopy.Results showed that the 3%(mass fraction)Li2MnO3 composite material exhibit higher initial discharge capability(183 m A·h/g at 0.5C),more stable cycle performance(with capacity retention of 93.9%after 120 cycles)and better rate performance,compared with unmodified cathode.Thus,this strategy is extremely promising for the preparation of Li Ni0.8Co0.1Mn0.1O2electrode materials with enhanced electrochemical performances.
作者
熊凡
王同振
高强
程凤如
罗惜情
Xiong Fan;Wang Tongzhen;Gao Qiang;Cheng Fengru;Luo Xiqing(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2020年第1期68-72,共5页
Inorganic Chemicals Industry