Understanding the trace Ti surface doping on promoting the low temperature performance of LiNi1/3Co1/3Mn1/3O2 cathode

作者：Li Guangyin; Huang Zhenlei; Zuo Zicheng; Zhang Zhanjun^*; Zhou Henghui

来源：Journal of Power Sources, 2015, 281: 69-76.

DOI：10.1016/j.jpowsour.2015.01.173

• Lithium ion batteries
• Surface property
• Lithium nickel cobalt manganese oxide
• Low temperature

The effect of surface property of LiNi1/3Co1/3Mn1/3O2 on the low temperature performance is seldom studied. Herein, the trace Ti surface-doped LiNi1/3Co1/3Mn1/3O2 exhibits enhanced discharge capacity under low temperature. After doping, the discharge capacity of LiNi1/3Co1/3Mn1/3O2 at -20 degrees C is 51.3 mAh g(-1) at 5C, which is near twice as much as the bare material (30.1 mAh g(-1)). Via the X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy and X-ray photoelectron spectroscopy analysis, it is confirmed that Ti doping on the surface significantly alters the surface property of LiNi1/3Co1/3Mn1/3O2 particle. The surface-doped Ti efficiently changes the lattice parameters, reduces the electrochemical reaction resistance and finally enhances the discharge capacity. The study clarifies the nature of trace Ti surface doping and is helpful for understanding the enhancement mechanism of the low temperature performance of LiNi(1/3)Co(1/3)Ma(1/3)O(2).

• 出版日期2015-5-1
• 单位北京大学; 中国科学院大学