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Citation: YANG Xiao, NI Jiang-feng, HUANG You-yuan, CHEN Ji-tao, ZHOU Heng-hui, ZHANG Xinxiang. Effect of Ti-Doping on Different Morphologic LiCoO₂[J]. Acta Physico-Chimica Sinica, ;2006, 22(02): 183-188. doi: 10.3866/PKU.WHXB20060211 shu

Effect of Ti-Doping on Different Morphologic LiCoO₂

1.
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 26 August 2005
Available Online: 22 January 2006

The effect of Ti-doping on different morphologic LiCoO2 was characterized by scanning electron microscope(SEM) along with energy dispersive spectroscopy(EDS), X-ray diffraction(XRD), electrochemical impedance spectroscopy(EIS), and galvanostatic charge-discharge tests. The result indicated that Ti-doping did not affect the structure of different morphologic LiCoO2 but considerably improved its electrochemical performance, especially the behavior of large current discharge (1 C). In the case of being discharged at a 1 C discharge rate, 3.8 V voltage plateau(the ratio of capacity above 3.8 V to total capacity) of secondary particles doped with TiO2 could retain 60% after 20 cycles, which was better than primary particles doped with TiO2 (40%). EIS result showed that Ti-doping could evidently suppress the increase of the electrochemical reaction resistant at large current discharge rate for secondary particles.
- LiCoO2;Morphology;Doping;Titanium oxide;Lithium ion batteries
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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通讯作者: 陈斌, bchen63@163.com

Effect of Ti-Doping on Different Morphologic LiCoO₂