东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2009, Vol. 30 ›› Issue (9): 1298-1301.DOI: -

• 论著 • 上一篇    下一篇

LiFePO_4的水热合成及电化学性能

康晓雪;田彦文;袁万颂;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2009-09-15 发布日期:2013-06-22
  • 通讯作者: Tian, Y.-W.
  • 作者简介:-
  • 基金资助:
    辽宁省科技攻关项目(2005224016)

Hydrothermal synthesis and electrochemical properties of lithium iron phosphate

Kang, Xiao-Xue (1); Tian, Yan-Wen (1); Yuan, Wan-Song (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2009-09-15 Published:2013-06-22
  • Contact: Tian, Y.-W.
  • About author:-
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摘要： 通过水热法合成了纯度较高、结晶良好且粒径均匀细小的LiFePO4粉体.采用XRD,SEM对材料的结构和形貌进行分析,并研究了水热合成温度和反应时间对材料电化学性能的影响.结果表明,提高反应温度和延长合成时间有利于提高材料的结晶度,但会增大材料粒径.200℃水热合成5 h样品电化学性能最佳,0.1C倍率首次放电比容量138.0 mAh.g-1,具备工业化实用性.在水热合成中加入抗坏血酸和葡萄糖可有效避免Fe2+的氧化并增强材料的导电性.

关键词: 锂离子电池, 正极材料, LiFePO4, 水热合成, 电化学性能

Abstract: High-purity and well-crystallized LiFePO4 powders with uniformly distributed fine particles were synthesized in a direct hydrothermal reaction. The microstructure and morphology of the samples were characterized via XRD, SEM and constant current charge-discharge cycle test so as to investigate the influences of hydrothermal temperature/time on the electrochemical properties of as-prepared LiFePO4 powder. The results showed that increasing hydrothermal temperature/time benefits the improvement of crystallinity but coarsens the particles. The best electrochemical properties of the LiFePO4 hydrothermally synthesized are found at 200°C/5 hr with a specific capacity 138.0 mA·h·g-1 at 0.1C rate during initial discharging. It means that the hydrothermal synthesis is commercially practical. Moreover, adding the ascorbic acid and glucose in the hydrothermal synthesis can avoid efficiently the oxidation of Fe2+, thus enhancing the electric conductivity of LiFePO4 powder.

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