自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 15    No. 4    August 2008

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Preparation of LiFePO4 for lithium ion battery using Fe2P2O7 as precursor
HU Guo-rong(胡国荣), XIAO Zheng-wei(肖政伟), PENG Zhong-dong(彭忠东),
DU Ke(杜 柯), DENG Xin-rong(邓新荣)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:In order to obtain a new precursor for LiFePO4, Fe2P2O7 with high purity was prepared through solid phase reaction at 650 ℃ using starting materials of FeC2O4 and NH4H2PO4 in an argon atmosphere. Using the as-prepared Fe2P2O7, Li2CO3 and glucose as raw materials, pure LiFePO4 and LiFePO4/C composite materials were respectively synthesized by solid state reaction at 700 ℃ in an argon atmosphere. X-ray diffractometry and scanning electron microscopy(SEM) were employed to characterize the as-prepared Fe2P2O7, LiFePO4 and LiFePO4/C. The as-prepared Fe2P2O7 crystallizes in the space group and belongs to β-Fe2P2O7 for crystal phase. The particle size distribution of Fe2P2O7 observed by SEM is 0.4−3.0 μm. During the Li+ ion chemical intercalation, radical is disrupted into two ions in the presence of O2−, thus providing a feasible technique to dispose this poor dissolvable pyrophosphate. LiFePO4/C composite exhibits initial charge and discharge capacities of 154 and 132 mA•h/g, respectively.

 

Key words: lithium ion battery; cathode material; preparation; precursor; LiFePO4; Fe2P2O7

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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