A Facile Route for Synthesis of LiFePO4/C Cathode Material with Nano-sized Primary Particles

doi:10.1016/S1004-9541(14)60067-7

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (5): 590-595.DOI: 10.1016/S1004-9541(14)60067-7

• 催化、动力学与反应工程 • 上一篇下一篇

A Facile Route for Synthesis of LiFePO₄/C Cathode Material with Nano-sized Primary Particles

肖政伟, 胡国荣, 杜柯, 彭忠东

1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2 School of Metallurgy and Environment, Central South University, Changsha 410083, China

收稿日期:2013-03-22 修回日期:2013-07-07 出版日期:2014-05-28 发布日期:2014-05-06
通讯作者: XIAO Zhengwei,E-mail: csuxiao@163.com
基金资助:
Supported partially by the Natural Science Foundation of Yunnan Province (2010ZC051) and Analysis and Testing Foundation (2009-041) and Starting Research Fund (14118245) from Kunming University of Science and Technology.

A Facile Route for Synthesis of LiFePO₄/C Cathode Material with Nano-sized Primary Particles

XIAO Zhengwei, HU Guorong, DU Ke, PENG Zhongdong

1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2 School of Metallurgy and Environment, Central South University, Changsha 410083, China

Received:2013-03-22 Revised:2013-07-07 Online:2014-05-28 Published:2014-05-06
Supported by:
Supported partially by the Natural Science Foundation of Yunnan Province (2010ZC051) and Analysis and Testing Foundation (2009-041) and Starting Research Fund (14118245) from Kunming University of Science and Technology.

摘要/Abstract

摘要： A facile and practical route was introduced to prepare LiFePO₄/C cathode material with nano-sized primary particles and excellent electrochemical performance. LiH₂PO₄ was synthesized by using H₃PO₄ and LiOH as raw materials. Then, as-prepared LiH₂PO₄, reduced iron powder and α-D-glucose were ball-milled, dried and sintered to prepare LiFePO₄/C. X-ray diffractometry was used to characterize LiH₂PO₄, ball-milled product and LiFePO₄/C. Differential scanning calorimeter-thermo gravimetric analysis was applied to investigate possible reactions in sintering and find suitable temperature for LiFePO₄ formation. Scanning electron microscopy was employed for the morphology of LiFePO₄/C. As-prepared LiH₂PO₄ is characterized to be in P21cn(33) space group, which reacts with reduced iron powder to form Li₃PO₄, Fe₃(PO₄)₂ and H₂ in ball-milling and sintering. The appropriate temperature for LiFePO₄/C synthesis is 541.3-976.7℃. LiFePO₄/C prepared at 700℃ presents nano-sized primary particles forming aggregates. Charge-discharge examination indicates that as-prepared LiFePO₄/C displays appreciable discharge capacities of 145 and 131 mA·h·g^-1 at 0.1 and 1 C respectively and excellent discharge capacity retention.

关键词: lithium ion cell, reduced iron powder, ball-milling, LiFePO₄/C, nano-sized primary particle

Abstract: A facile and practical route was introduced to prepare LiFePO₄/C cathode material with nano-sized primary particles and excellent electrochemical performance. LiH₂PO₄ was synthesized by using H₃PO₄ and LiOH as raw materials. Then, as-prepared LiH₂PO₄, reduced iron powder and α-D-glucose were ball-milled, dried and sintered to prepare LiFePO₄/C. X-ray diffractometry was used to characterize LiH₂PO₄, ball-milled product and LiFePO₄/C. Differential scanning calorimeter-thermo gravimetric analysis was applied to investigate possible reactions in sintering and find suitable temperature for LiFePO₄ formation. Scanning electron microscopy was employed for the morphology of LiFePO₄/C. As-prepared LiH₂PO₄ is characterized to be in P21cn(33) space group, which reacts with reduced iron powder to form Li₃PO₄, Fe₃(PO₄)₂ and H₂ in ball-milling and sintering. The appropriate temperature for LiFePO₄/C synthesis is 541.3-976.7℃. LiFePO₄/C prepared at 700℃ presents nano-sized primary particles forming aggregates. Charge-discharge examination indicates that as-prepared LiFePO₄/C displays appreciable discharge capacities of 145 and 131 mA·h·g^-1 at 0.1 and 1 C respectively and excellent discharge capacity retention.

Key words: lithium ion cell, reduced iron powder, ball-milling, LiFePO₄/C, nano-sized primary particle

肖政伟, 胡国荣, 杜柯, 彭忠东. A Facile Route for Synthesis of LiFePO₄/C Cathode Material with Nano-sized Primary Particles[J]. Chinese Journal of Chemical Engineering, 2014, 22(5): 590-595.

XIAO Zhengwei, HU Guorong, DU Ke, PENG Zhongdong. A Facile Route for Synthesis of LiFePO₄/C Cathode Material with Nano-sized Primary Particles[J]. Chin.J.Chem.Eng., 2014, 22(5): 590-595.

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A Facile Route for Synthesis of LiFePO₄/C Cathode Material with Nano-sized Primary Particles

A Facile Route for Synthesis of LiFePO₄/C Cathode Material with Nano-sized Primary Particles

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