Property and Structure of Carbon-coated LiFePO4

doi:10.3724/SP.J.1077.2011.00265

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (3): 265-270.DOI: 10.3724/SP.J.1077.2011.00265

• Research Paper • Previous Articles Next Articles

Property and Structure of Carbon-coated LiFePO₄

ZHANG Dong-Yun¹,², ZHANG Pei-Xin¹, ³,LIN Mu-Chong³, LIU Kun², YUAN Qiu-Hua³, XU Qi-Ming¹, LUO Zhong-Kuan³, REN Xiang-Zhong³

1. School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; 3. School of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, China

Received:2010-05-20 Revised:2010-07-01 Published:2011-03-20 Online:2011-02-18
Supported by:
National Natural Science Foundation of China(50874074, 50474092); Natural Science Foundation of Guangdong Province(8151806001000028); Shenzhen Government’s Plan of Science and Technology(ZYC200903250150A); Open Research Fundof Shenzhen Key Laboratory of Functional Polymer(FP20090104)

Abstract

Abstract: LiFePO₄/Ccomposite cathode materials containing different amounts of carbon were fabricated by mechanical activation–high temperature solid statereaction using citric acid as a carbon source, with the aim to study the effectof carbon-coating on LiFePO₄internal structure. The crystal structure, surface morphology and electrochemical properties of the obtained composites coated with various carbon contents were investigated by the techniques of XRD, SEM, BET, HRTEM, SAED, AC Impedance spectra, and constant current charge-discharge testing. And the structural changes originating from the carbon-coatingwere also analyzed. Under high temperature, citric acid was decomposed into network-like structure amorphous carbon, and coated on the surface of LiFePO₄ particles, which could inhibit the grain growth and cause the smaller sizes.The crystal growth direction and micro-structure of LiFePO₄/C were significantly influenced by carbon-coating that resulted in growing along direction preferentially.According to AC Impedance spectra measurements, all the impedances of carboncoated LiFePO₄ decreased evidently, and the diffusion coefficient of Li ions increased by up to two orders of magnitude compared with uncoated LiFePO₄, indicating the ion and electric conductivity,discharge capacity and cycling performance were greatly improved.

Key words: lithium-ion batteries, cathode materials, LiFePO₄, structure, carbon-coating

CLC Number:

TM912

ZHANG Dong-Yun,, ZHANG Pei-Xin, ,LIN Mu-Chong, LIU Kun, YUAN Qiu-Hua, XU Qi-Ming, LUO Zhong-Kuan, REN Xiang-Zhong. Property and Structure of Carbon-coated LiFePO₄[J]. Journal of Inorganic Materials, 2011, 26(3): 265-270.

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Property and Structure of Carbon-coated LiFePO₄

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