PANI-PEG copolymer modified LiFePO4 as a cathode material for high-performance lithium ion batteries

Chunli Gong; Fangli Deng; Chi Pong Tsui; Zhigang Xue; Yun Sheng Ye; Chak Yin Tang; Xingping Zhou; Xiaolin Xie

doi:10.1039/c4ta04089a

PANI-PEG copolymer modified LiFePO4 as a cathode material for high-performance lithium ion batteries

Chunli Gong, Fangli Deng, Chi Pong Tsui, Zhigang Xue, Yun Sheng Ye, Chak Yin Tang, Xingping Zhou, Xiaolin Xie

Research output: Journal article publication › Journal article › Academic research › peer-review

69 Citations (Scopus)

Abstract

The poor electronic conductivity and low lithium ion diffusion rate of a LiFePO4 cathode material are the two major obstacles for its commercial applications in the power lithium ion batteries. This article utilized an electroactive and ion conductive copolymer, polyaniline-poly(ethylene glycol) (PANI-PEG), to modify carbon-LiFePO4 (cLFP) by a facile in situ chemical copolymerization method. The structure and morphology of the cLFP/PANI-PEG composite were confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Compared with a cLFP/PANI composite, the cLFP/PANI-PEG composite exhibited a more uniform and full polymer coating layer. Furthermore, this cLFP/PANI-PEG cathode material exhibits excellent cyclic stability (95.7% capacity retention after 100 cycles at 0.1 C) and high rate capability (125.3 mA h g-1 at 5 C) as the PANI-PEG copolymer coating layer facilitated electron and ion transport within the electrode. Electrochemical impedance spectroscopy (EIS) proved that the lithium ion diffusion in the cLFP/PANI-PEG composite was increased significantly by one order of magnitude compared with cLFP, indicating its possibility to be served as a cathode material for high-performance lithium ion batteries.

Original language	English
Pages (from-to)	19315-19323
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	2
Issue number	45
DOIs	https://doi.org/10.1039/c4ta04089a
Publication status	Published - 7 Dec 2014

ASJC Scopus subject areas

General Chemistry
Renewable Energy, Sustainability and the Environment
General Materials Science

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10.1039/c4ta04089a

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title = "PANI-PEG copolymer modified LiFePO4 as a cathode material for high-performance lithium ion batteries",

abstract = "The poor electronic conductivity and low lithium ion diffusion rate of a LiFePO4 cathode material are the two major obstacles for its commercial applications in the power lithium ion batteries. This article utilized an electroactive and ion conductive copolymer, polyaniline-poly(ethylene glycol) (PANI-PEG), to modify carbon-LiFePO4 (cLFP) by a facile in situ chemical copolymerization method. The structure and morphology of the cLFP/PANI-PEG composite were confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Compared with a cLFP/PANI composite, the cLFP/PANI-PEG composite exhibited a more uniform and full polymer coating layer. Furthermore, this cLFP/PANI-PEG cathode material exhibits excellent cyclic stability (95.7% capacity retention after 100 cycles at 0.1 C) and high rate capability (125.3 mA h g-1 at 5 C) as the PANI-PEG copolymer coating layer facilitated electron and ion transport within the electrode. Electrochemical impedance spectroscopy (EIS) proved that the lithium ion diffusion in the cLFP/PANI-PEG composite was increased significantly by one order of magnitude compared with cLFP, indicating its possibility to be served as a cathode material for high-performance lithium ion batteries.",

author = "Chunli Gong and Fangli Deng and Tsui, {Chi Pong} and Zhigang Xue and Ye, {Yun Sheng} and Tang, {Chak Yin} and Xingping Zhou and Xiaolin Xie",

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T1 - PANI-PEG copolymer modified LiFePO4 as a cathode material for high-performance lithium ion batteries

AU - Gong, Chunli

AU - Deng, Fangli

AU - Tsui, Chi Pong

AU - Xue, Zhigang

AU - Ye, Yun Sheng

AU - Tang, Chak Yin

AU - Zhou, Xingping

AU - Xie, Xiaolin

PY - 2014/12/7

Y1 - 2014/12/7

N2 - The poor electronic conductivity and low lithium ion diffusion rate of a LiFePO4 cathode material are the two major obstacles for its commercial applications in the power lithium ion batteries. This article utilized an electroactive and ion conductive copolymer, polyaniline-poly(ethylene glycol) (PANI-PEG), to modify carbon-LiFePO4 (cLFP) by a facile in situ chemical copolymerization method. The structure and morphology of the cLFP/PANI-PEG composite were confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Compared with a cLFP/PANI composite, the cLFP/PANI-PEG composite exhibited a more uniform and full polymer coating layer. Furthermore, this cLFP/PANI-PEG cathode material exhibits excellent cyclic stability (95.7% capacity retention after 100 cycles at 0.1 C) and high rate capability (125.3 mA h g-1 at 5 C) as the PANI-PEG copolymer coating layer facilitated electron and ion transport within the electrode. Electrochemical impedance spectroscopy (EIS) proved that the lithium ion diffusion in the cLFP/PANI-PEG composite was increased significantly by one order of magnitude compared with cLFP, indicating its possibility to be served as a cathode material for high-performance lithium ion batteries.

AB - The poor electronic conductivity and low lithium ion diffusion rate of a LiFePO4 cathode material are the two major obstacles for its commercial applications in the power lithium ion batteries. This article utilized an electroactive and ion conductive copolymer, polyaniline-poly(ethylene glycol) (PANI-PEG), to modify carbon-LiFePO4 (cLFP) by a facile in situ chemical copolymerization method. The structure and morphology of the cLFP/PANI-PEG composite were confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Compared with a cLFP/PANI composite, the cLFP/PANI-PEG composite exhibited a more uniform and full polymer coating layer. Furthermore, this cLFP/PANI-PEG cathode material exhibits excellent cyclic stability (95.7% capacity retention after 100 cycles at 0.1 C) and high rate capability (125.3 mA h g-1 at 5 C) as the PANI-PEG copolymer coating layer facilitated electron and ion transport within the electrode. Electrochemical impedance spectroscopy (EIS) proved that the lithium ion diffusion in the cLFP/PANI-PEG composite was increased significantly by one order of magnitude compared with cLFP, indicating its possibility to be served as a cathode material for high-performance lithium ion batteries.

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PANI-PEG copolymer modified LiFePO4 as a cathode material for high-performance lithium ion batteries

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