Modification of LiFePO4 Based on Zeolite Imidazolate Framework-8

doi:10.11944/j.issn.1000-0518.2018.08.180147

Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (8): 939-945.DOI: 10.11944/j.issn.1000-0518.2018.08.180147

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Modification of LiFePO₄ Based on Zeolite Imidazolate Framework-8

XU Xiaolong,HAO Zhendong,LI Haoqiang,WANG Hao(),LIU Jingbing,YAN Hui

School of Materials Science and Engineering,Beijing University of Technology,Beijing 1100124,China

Received:2018-05-02 Accepted:2018-06-15 Published:2018-07-24 Online:2018-07-24
Contact: WANG Hao
Supported by:
Supported by the Funding Project of the Science and Technology Plan Project of the Beijing Municipal Education Commission(No.KZ201710005009)

Abstract

Abstract:

The conductivity of commercial LiFePO₄(LFP) cathode materials has been the key to improving its electrochemical performance. Porous carbon was prepared by using zeolite imidazolate framework-8(ZIF-8) to improve the conductivity of commercial LFP cathode material for enhancing its electrochemical performance. Two routes for modifying LFP are compared:1)the carbonized ZIF-8(C_ZIF-8) was mixed with LFP to form LFP/C_ZIF-8 cathode material; 2)the LFP@C_ZIF-8 cathode material was obtained by in situ growth and annealing of ZIF-8 on the surface of LFP. X-ray powder diffraction(XRD), N₂ adsorption and desorption isotherms(BET) and Raman spectra reveal that the modified LFP still has an olivine structure, and the characteristics of graphite carbon materials with mesoporous structure appear at the same time. Scanning electron microscopy(SEM) and transmission electron microscopy(TEM) tests display that there is no link structure between LFP and C_ZIF-8 in the LFP/C_ZIF-8 samples, while LFP@C_ZIF-8 sample has a core-shell structure. Electrochemical impedance spectroscopy(EIS) shows that the ion transport impedance of the modified samples decreased significantly, indicating that the conductivity of LFP can be improved by these two routes. The charge-discharge cycle test proves that the two modified methods can improve the cycle performance and Coulombic efficiency of LFP cathode material. The high C rate charge-discharge test shows that the LFP/C_ZIF-8 sample is better than LFP@C_ZIF-8 sample, the discharge capacity of LFP/C_ZIF-8 sample can reach 57.8 mA·h/g at 10.0 C. This research provides a new idea for the modification of commercial lithium ion battery electrode materials, and lays the foundation for industrialization via the method optimization.

Key words: lithium ion battery, LiFePO₄, zeolite imidazolate framework-8, mesoporous carbon, graphitization, electrode modification

XU Xiaolong, HAO Zhendong, LI Haoqiang, WANG Hao, LIU Jingbing, YAN Hui. Modification of LiFePO₄ Based on Zeolite Imidazolate Framework-8[J]. Chinese Journal of Applied Chemistry, 2018, 35(8): 939-945.

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Modification of LiFePO₄ Based on Zeolite Imidazolate Framework-8

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