Synthesis and electrochemical performance of xLi2MnO3·(1−x)LiMn0.5Ni0.4Co0.1O2 for lithium ion battery

• Published in: Powder technology 2013-02, Vol.235, p.158-162
• Main Authors: He, Zhenjiang, Wang, Zhixing, Guo, Huajun, Li, Xinhai, Yue, Peng, Wang, Jiexi, Xiong, Xunhui
• Format: Article
• Language: English
• Subjects: Applied sciences; batteries; Cathode material; Cathodes; Chemical engineering; Density; dielectric spectroscopy; Discharge; Displays; electrochemistry; Electrodes; Exact sciences and technology; lithium; Lithium ion batteries; Low currents; Miscellaneous; Powder technology; Scanning electron microscopy; Solid-solid systems; Spray drying; X-ray diffraction
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2012.09.020

The cathode material xLi2MnO3·(1−x)LiMn0.5Ni0.4Co0.1O2 was synthesized via a spray drying followed by solid-state calcination. The properties of the layered oxide cathodes for x=0.3, 0.5, 0.7 have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic cell cycling, as well as Ac impedance spectroscopy. The results indicate that, when x=0.3, the layered oxide cathode shows the best charge–discharge performances of low current density. Between 2.5 and 4.8V (vs. Li/Li+), the initial discharge capacities of 0.3Li2MnO3·0.7LiMn0.5Ni0.4Co0.1O2 are 238, 229 and 206mAhg−1 at a constant current density of 12.5, 25 and 50mAg−1, respectively. The electrode composition 0.7Li2MnO3·0.3LiMn0.5Ni0.4Co0.1O2 displays the best performance at high charge–discharge rate. The initial discharge capacity of 0.7Li2MnO3·0.3LiMn0.5Ni0.4Co0.1O2 is 135mAhg−1 at 250mAg−1, after 50cycles, the discharge capacities of the layered oxide cathode remains 85%. The cathode material xLi2MnO3·(1−x)LiMn0.5Ni0.4Co0.1O2 was prepared by spray drying and subsequent calcination. Although increase of Li2MnO3 component results in the reduction of discharge capacity, it shows better rate capacity and stability at high current density. It indicates that selecting an appropriate x value of xLi2MnO3·(1−x)LiMO2 is very important for the application of this cathode material. [Display omitted] ► The precursor powders have been synthesized by a simple method. ► The xLi2MnO3·(1−x)LiMn0.5Ni0.4Co0.1O2 particles with submicron size. ► The cathode material shows excellent electrochemical performance. ► The performance makes this material attractive for large applications.