一种新碳源包覆的LiFePO4/C正极材料的合成及性能

doi:10.3866/PKU.WHXB20110807

Abstract

Abstract:

We synthesized LiFePO₄/C composite cathode materials by the rheological phase method with vegetable protein soya bean milk as a carbon source while FePO₄·4H₂O and LiOH·H₂O as raw materials. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the LiFePO₄/C composite materials had good crystallinity, ultrafine sphere-like particles of 200 nm in size and in situ carbon. The electrochemical performance of LiFePO₄/C by galvanostatic cycling studies showed excellent cycle stability. The LiFePO₄/C cathode material gave a high initial discharge capacity of 156 mAh·g^-1 at 0.1C and the first columbic efficiency was 98.7%. This capacity was still 149 mAh·g^-1 after 40 cycles at 0.1C and its capacity retention was more than 95% while the discharge capacity reached 134.7 mAh·g^-1 at 1C indicating high electrochemical capacity and excellent cycling stability.

Key words: Lithium-ion battery, LiFePO₄, Cathode material, Vegetable protein, Carbon coating, Bean milk, Rheological phase method

CHU Dao-Bao, LI Yan, SONG Qi, ZHOU Ying. Synthesis and Properties of LiFePO₄/C Cathode Material with a New Carbon Source[J].Acta Phys. -Chim. Sin., 2011, 27(08): 1863-1867.

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Synthesis and Properties of LiFePO₄/C Cathode Material with a New Carbon Source

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Synthesis and Properties of LiFePO₄/C Cathode Material with a New Carbon Source