无机材料学报 ›› 2012, Vol. 27 ›› Issue (9): 997-1002.DOI: 10.3724/SP.J.1077.2012.12143 CSTR: 32189.14.SP.J.1077.2012.12143

• 研究快报 • 上一篇    下一篇

以Fe2O3为原料通过水热–高温煅烧法合成LiFePO4/C纳米复合材料及其电化学性能研究

邓洪贵1, 金双玲1, 何 星2, 詹 亮1, 乔文明1, 凌立成1   

  1. (1. 华东理工大学 化学工程联合国家重点实验室, 上海 200237; 2. 上海理工大学 材料科学与工程学院, 上海 200093)
  • 收稿日期:2012-03-07 修回日期:2012-05-07 出版日期:2012-09-20 网络出版日期:2012-08-28
  • 作者简介:DENG Hong-Gui (1984–), male, PhD. E-mail: hongguideng@gmail.com
  • 基金资助:

    National Natural Science Foundation of China (51002051); Fundamental Research Funds for the Central Universities (WA1014016); Science and Technology Commission of Shanghai Municipality (09520500900)

LiFePO4/C Nanocomposites Synthesized from Fe2O3 by a Hydrothermal Reaction-calcination Process and Their Electrochemical Performance

DENG Hong-Gui1, JIN Shuang-Ling1, HE Xing2, ZHAN Liang1, QIAO Wen-Ming1, LING Li-Cheng1   

  1. (1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;    2. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
  • Received:2012-03-07 Revised:2012-05-07 Published:2012-09-20 Online:2012-08-28
  • About author:DENG Hong-Gui (1984–), male, PhD. E-mail: hongguideng@gmail.com
  • Supported by:

    National Natural Science Foundation of China (51002051); Fundamental Research Funds for the Central Universities (WA1014016); Science and Technology Commission of Shanghai Municipality (09520500900)

摘要: 采用三氧化二铁(Fe2O3)为铁源, 抗坏血酸作碳源, 通过在200℃下水热反应并经煅烧后合成出LiFePO4/C纳米复合材料. 抗坏血酸在水热反应体系中不但作为最终反应产物的碳源, 而且还起到了限制LiFePO4颗粒生长的作用. 抗坏血酸的用量对产物的形貌、结构、碳含量有重要影响, 进而影响产物的电化学性能. 当抗坏血酸用量为1 g时, 制得的LiFePO4/C纳米复合材料的粒径在220~280 nm. 该材料用作锂离子电池的正极材料时, 在0.1C的电流密度下循环500次后其放电容量仍保持159 mAh/g, 并且具有较好的倍率性能. 

关键词: 锂离子电池, 磷酸铁锂, Fe2O3, 水热法

Abstract: LiFePO4 nanoparticles coated with a carbon layer were synthesized by a hydrothermal reaction-calcination process, using Fe2O3 as an iron source and ascorbic acid as carbon source. The amount of ascorbic acid have an effect on the structure, phase and carbon amount of the final product. With 1 g ascorbic acid used in the reaction, the particle sizes of synthesized LiFePO4/C nanocomposites are in a range of 220–280 nm. Using as the cathode materials for the lithium-ion batteries, the as-prepared material shows high capacity and good cycle stability (159 mAh/g at 0.1C over 500 cycles), as well as good rate capability.

Key words: lithium ion battery, lithium iron phosphate, Fe2O3, hydrothermal method

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