Modification of LiFePO4 with Resorcinol-formaldehyde Resin as Carbon Source

doi:10.3724/SP.J.1077.2007.00864

Abstract

Abstract: Lithium ion battery cathode material LiFePO₄/C was prepared by using resorcinol-formaldehyde resin as carbon source. Effects of resin on purity and electrochemical performance of LiFePO₄ were investigated by XRD and galvanostatic charge-discharge test. The results indicate that the hydrogen resulted from pyrolysis of resorcinol-formaldehyde resin can react with LiFePO₄, then Fe₂P, FeP and Li₃PO₄ are formed. Such impurities will lead the capacity of the materials decrease. The impurities can be reduced significantly by carbonization at lower temperature before calcination at higher temperature. The capacity and cycle property of LiFePO₄ are improved greatly by the addition of resorcinol-formaldehyde resin. The specific discharge capacity of LiFePO₄ reaches up to 160, 150, 135 and 120mAh/g at 0.2C,1C,2C and 5C(1C=150mA/g) rates, respectively.

Key words: lithium ion battery, LiFePO4, resorcinol-formaldehyde resin, electrochemical performance

CLC Number:

TM912

ZHANG Zi-Lu,LU Jia-Chun,YANG Yu-Sheng. Modification of LiFePO₄ with Resorcinol-formaldehyde Resin as Carbon Source[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00864.

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Modification of LiFePO₄ with Resorcinol-formaldehyde Resin as Carbon Source

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