物理化学学报 >> 2011, Vol. 27 >> Issue (08): 1863-1867.doi: 10.3866/PKU.WHXB20110807

电化学和新能源 上一篇    下一篇

一种新碳源包覆的LiFePO4/C正极材料的合成及性能

褚道葆, 李艳, 宋奇, 周莹   

  1. 安徽省功能性分子固体、分子基材料重点实验室, 安徽师范大学化学与材料科学学院, 安徽 芜湖 241000
  • 收稿日期:2011-04-08 修回日期:2011-05-31 发布日期:2011-07-19
  • 通讯作者: 褚道葆 E-mail:dbchu@sina.com
  • 基金资助:

    国家自然科学基金(20476001)和安徽省自然科学基金(070414160)资助项目

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

CHU Dao-Bao, LI Yan, SONG Qi, ZHOU Ying   

  1. Anhui Key Laboratory of Functional Molecular Solids and Molecular-based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, Anhui Province, P. R. China
  • Received:2011-04-08 Revised:2011-05-31 Published:2011-07-19
  • Contact: CHU Dao-Bao E-mail:dbchu@sina.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20476001) and Natural Science Foundation of Anhui Province, China (070414160).

摘要:

以富含植物蛋白的豆浆作为碳源, 以FePO4·4H2O和LiOH·H2O为原料, 采用流变相方法合成了锂离子电池正极材料LiFePO4/C. X射线衍射(XRD)和扫描电子显微镜(SEM)的表征结果显示, 样品具有良好的结晶性能, 平均粒径约200 nm, 颗粒表面有均匀网络状的碳包覆. 充放电循环研究结果表明: LiFePO4/C具有稳定的电化学循环性能, LiFePO4/C正极材料在0.1C倍率下首次放电比容量达到156 mAh·g-1, 首次充放电效率达到98.7%; 循环40次后, 放电比容量为149 mAh·g-1, 电池容量保持率在95%以上, 1C倍率下首次放电比容量达到134.7 mAh·g-1, 显示出较高的电化学容量和优良的循环稳定性.

关键词: 锂离子电池, 磷酸亚铁锂, 正极材料, 植物蛋白, 碳包覆, 豆浆, 流变相法

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

MSC2000: 

  • O646