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Citation: ZHAO Xia, OU Xiu-Qin, LIANG Guang-Chuan, WANG Li, XU Sheng-Zhao. Effect of Pyrolytic Reaction Conditions on Surface Free Energy of LiFePO₄/C Composite[J]. Acta Physico-Chimica Sinica, ;2008, 24(07): 1326-1328. doi: 10.3866/PKU.WHXB20080736 shu

Effect of Pyrolytic Reaction Conditions on Surface Free Energy of LiFePO₄/C Composite

1.
Institute of Power Source and Ecomaterials Science, Hebei University of Technology, Tianjin 300130, P. R. China

Received Date: 9 January 2008
Available Online: 21 April 2008

Lithium iron phosphate powders were prepared by hydrothermal synthesis, and coated using glucose as carbon precursor. The contact angles for calculating surface free energy of LiFePO4 powders with three probe liquids were measured. The surface free energy and its dispersive part and polar part were calculated, based on Young equation and the method suggested by Wu. The relations of surface free energy to conductivity, coating property and specific capacity were studied. The results indicated that with the same conductivity, the dispersive/polar ratio of surface free energies (SE) of the powders had no effect on lowrate discharge capability, whereas had great effect on high rate discharge capability. The higher temperature and longer time of pyrolytic reaction led to an increase of the dispersive/polar ratio, which was beneficial for its adhesion with polyvinylidene fluoride (PVdF) and the enhancement of high rate discharge capability.
- LiFePO4; Surface free energy; Conductivity; Rate capability
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of Pyrolytic Reaction Conditions on Surface Free Energy of LiFePO4/C Composite

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通讯作者: 陈斌, bchen63@163.com

Effect of Pyrolytic Reaction Conditions on Surface Free Energy of LiFePO₄/C Composite