Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (9): 1641-1649.doi: 10.3866/PKU.WHXB201406172

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Electrochemical Performances of Li1.2Mn0.54-xNi0.13Co0.13ZrxO2 Cathode Materials for Lithium-Ion Batteries

REN Xiang-Zhong, LIU Tao, SUN Ling-Na, ZHANG Pei-Xin   

  1. College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China
  • Received:2014-04-18 Revised:2014-06-16 Published:2014-08-29
  • Contact: REN Xiang-Zhong E-mail:renxz@szu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21000174), Shenzhen Strategic Emerging Industry Development Funds, China (JCYJ20120613163733279, JCYJ20130329113849606).

Abstract:

To improve the cycling performance of lithium-rich cathode materials, Li1.2Mn0.54Ni0.13Co0.13O2 and Li1.2Mn0.54-xNi0.13Co0.13ZrxO2 (x=0.00, 0.01, 0.02, 0.03, and 0.06) were synthesized by a combustion method. The structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical performances were examined by cyclic voltammetry (CV), electrochemical AC impedance spectroscopy, and galvanostatic charge-discharge cycling. The results indicate that all of the doped samples have a layer of α-NaFeO2. When charged and discharged at 0.1C and 1.0C (1.0C=180 mA·g-1) in the voltage range of 2.0-4.8 V, the initial discharge capacities of Li1.2Mn0.52Ni0.13Co0.13Zr0.02O2 were 280.3 and 206.4 mAh·g-1, respectively. Moreover, the capacity retention after 50 cycles improved from 73.2% to 88.9% at 1.0C at room temperature. Meanwhile, this system delivered a higher discharge capacity of 76.5 mAh·g-1 than that of the bare materials (15 mAh·g-1) at 5.0C after 50 cycles. Electrochemical performances of the doped samples were improved at a 2.0C rate at different temperatures (50, 25, and -10 ℃). Furthermore, compared with the undoped material, the specific discharge capacity increased by 61.1% at -10 ℃ after 50 cycles.

Key words: Combustion method, Lithium-ion battery, Cathode material, Lithium-rich material, Doping

MSC2000: 

  • O646