Improved of cathode performance of LiFePO4/C composite using different carboxylic acids as carbon sources for lithium-ion batteries


Goktepe H., Sahan H., Kilic F. , PATAT Ş.

IONICS, cilt.16, ss.203-208, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 16 Konu: 3
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1007/s11581-009-0382-9
  • Dergi Adı: IONICS
  • Sayfa Sayıları: ss.203-208

Özet

Among the several materials under development for use as a cathodes in lithium-ion batteries olivine-type LiFePO4 is one of the most promising cathode material. However, its poor conductivity and low lithium-ion diffusion limits its practical application. In this study, we report seven different carboxylic acids used to synthesize LiFePO4/C composite, and influences of carbon sources on electrochemical performance were intensively studied. The structure and electrochemical properties of the LiFePO4/C were characterized by X-ray diffraction, scanning electron microscopy, electrical conductivity, and galvanostatic charge-discharge measurements. Among the materials studied, the sample E with tartaric acid as carbon source exhibited the best cell performance with a maximum discharge capacity of 160 mAh g(-1) at a 0.1 C-rate. The improved electrochemical properties were attributed to the reduced particle size and enhanced electrical contacts by carbon.