Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (8): 1527-1534.doi: 10.3866/PKU.WHXB201506151

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Facile Synthesis of 0.6Li2MnO3-0.4LiNi0.5Mn0.5O2 with Hierarchical Micro/Nanostructure and High Rate Capability as Cathode Material for Li-Ion Battery

Xia-Xing. SHI1,Shi-Xuan. LIAO1,Bing. YUAN1,Yan-Jun. ZHONG1,Ben-He. ZHONG1,Heng. LIU2,Xiao-Dong. GUO1()   

  1. 1 College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    2 College of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
  • Received:2015-04-22 Published:2015-08-12
  • Supported by:
    the Science and Technology Pillar Program of Sichuan University, China(2014GZ0077);Research Fund for theDoctoral Program of Higher Education, China(20120181120103)

Abstract:

The cuboid layered 0.6Li2MnO3-0.4LiNi0.5Mn0.5O2 cobalt-free lithium-rich solid-solution cathode material was synthesized by a facile quick co-precipitation method. The prepared material was characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma (ICP) spectroscopy, field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical measurements. It was found that the as-prepared material has a typical hexagonal α-NaFeO2 layered structure with R·\overline 3 $ m space group, and the chemical composition of this material is similar to the corresponding target material. SEM and TEM images reveal that the cuboid structures are assembled from nanoparticles with particle sizes of 40-200 nm. A possible formation mechanism of this cuboid aggregation is proposed. The electrochemical tests (in the voltage range 2.0-4.8 V vs Li/Li+) indicate that the as-prepared material exhibits excellent rate capability. It delivers approximately 243 and 143 mAh·g-1 corresponding to 0.1C and 10C, respectively. Moreover, the asprepared material has good cycling stability even after high rate measurement, delivering a high capacity retention of 90.7% after 72 cycles at 0.5C. This co-precipitation approach, which has facile operation processes and good results, is a economic technique that could facilitate the application of Li-rich cathode on a large scale.

Key words: Cathode material, Facile quick co-precipitation, Cuboid structure, Electrochemical performance, Li-ion battery

MSC2000: 

  • O646