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N-cyanoethyl polyethylenimine as a water-soluble binder for LiFePO4 cathode in lithium-ion batteries

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Abstract

N-cyanoethyl polyethylenimine (CN-PEI) is synthesized by modifying polyethylenimine (PEI) with acrylonitrile through a Michael addition reaction. Depending on cyanoethylation level, CN-PEI can be obtained as a form of solution, micro-emulsion or emulsion in water. CN-PEI micro-emulsion is investigated as water-soluble binder for the application of lithium iron phosphate (LFP) cathode in lithium-ion batteries. CN-PEI binder not only maintains the outstanding dispersion capability of PEI but also exhibits an excellent adhesion strength and higher ionic conductivity because of the introduction of polar cyano groups. As a result, CN-PEI binder can effectively maintain the mechanical integrity and decrease the polarization of LFP electrode during the operation of the battery. LFP electrode with CN-PEI binder exhibits good cycle stability and enhanced rate performance delivering a capacity of 99.6% at a rate of 0.5 C after 100 cycles and a high discharge capacity of 102.4 mAh g−1 at 5 C.

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Acknowledgements

This work was supported by the K.C. Wong Education Foundation, National Natural Science Foundation of China (21573239), Science & Technology project of Guangdong Province (2014TX01N014/2015B010135008), Guangzhou Municipal Project for Science & Technology (201509010018).

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Authors and Affiliations

  1. Key Laboratory of Renewable Energy, Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, Guangdong, China

    Jinxin Huang, Jinglun Wang, Haoxiang Zhong & Lingzhi Zhang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jinxin Huang

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  1. Jinxin Huang
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  2. Jinglun Wang
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Correspondence to Lingzhi Zhang.

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Huang, J., Wang, J., Zhong, H. et al. N-cyanoethyl polyethylenimine as a water-soluble binder for LiFePO4 cathode in lithium-ion batteries. J Mater Sci 53, 9690–9700 (2018). https://doi.org/10.1007/s10853-018-2247-y

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