Facile Synthesis of 0.6Li2MnO3-0.4LiNi0.5Mn0.5O< sub>2 with Hierarchical Micro/Nanostructure and High Rate Capability as Cathode Material for Li-Ion Battery

作者：Shi Xia-Xing; Liao Shi-Xuan; Yuan Bing; Zhong Yan-Jun; Zhong Ben-He; Liu Heng; Guo Xiao-Dong^*

来源：Acta Physico - Chimica Sinica, 2015, 31(8): 1527-1534.

DOI：10.3866/PKU.WHXB201506151

• Cathode material
• Facile quick co-precipitation
• Cuboid structure
• Electrochemical performance
• Li-ion battery

The cuboid layered 0.6Li(2)MnO(3)-0.4LiNi(0.5)Mn(0.5)O(2) 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 alpha-NaFeO2 layered structure with R (3) over barm 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 center dot g(-1) corresponding to 0.1C and 10C, respectively. Moreover, the as-prepared 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.

• 出版日期2015-8-12
• 单位四川大学