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The effects of PVAc on surface morphological and electrochemical performance of P(VdF-HFP)-based blend solid polymer electrolytes for lithium ion-battery applications

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Abstract

Solid polymer electrolytes (SPEs) have attracted ever increasing attention due to their huge potential applications in all-solid-state Li-ion batteries. High ionic conductivity and large extended electrochemical stability of SPEs are crucial for the high performance of Li-ion batteries. In this article, we demonstrate the effects of PVAc in P(VdF-HFP)-LiTFSI-EC complex, resulting in blend solid polymer electrolytes (BSPEs), were successfully prepared via solution casting technique. This method utilized the advantages of both polymers, resulting in superior ionic conductivity with enhanced mechanical integrity. Among the various concentrations, 10 wt% PVAc in P(VdF-HFP)-LiTFSI-EC exhibited a maximum ionic conductivity of 1.1 × 10−3 S cm−1, which is attributable to the suppression of PVdF crystalline phase and high Li-salt dissociation. The complex formation, surface morphology, thermal behavior, and thermal stability of BSPEs were systematically analyzed by FTIR, SEM, DSC, and TGA respectively. In addition, this sample shows a good electrochemical stability window (4.7 V) and Li transference number (0.29), which suggest that this could be a promising candidate for Li-ion batteries.

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Acknowledgments

M. Raja would like to thank DST-SERB for N-PDF Scheme of India. The authors are grateful to Dr. Helen Annal Therese (NRC, SRM-IST, Kattankulathur, Chennai) for his help in lithium-ion cell fabrication and Dr. M. N. Chandra Prabha (MSRIT) Bangalore for helpful discussion.

Funding

M. Sasikumar received financial support from the University Grants Commission (No. F. MRP-5633/15 (SERO/UGC)) of India. P. Sivakumar received financial support from the University Grants Commission (UGC –MRP NO. F. 42-807/2013 (SR)), New Delhi, India.

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Authors and Affiliations

  1. PG and Research Department of Physics, Bishop Heber College, Trichy, Tamil Nadu, 620 017, India

    M. Sasikumar

  2. PG and Research Department of Physics, Nehru Memorial College, Puthanampatti, Trichy, Tamil Nadu, 621 007, India

    A. Jagadeesan

  3. Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600 036, India

    M. Raja

  4. Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore, 560 054, India

    R. Hari Krishna

  5. PG and Research Department of Physics, Periyar E. V. R College, Trichy, Tamil Nadu, 620 023, India

    P. Sivakumar

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  1. M. Sasikumar
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Correspondence to P. Sivakumar.

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Sasikumar, M., Jagadeesan, A., Raja, M. et al. The effects of PVAc on surface morphological and electrochemical performance of P(VdF-HFP)-based blend solid polymer electrolytes for lithium ion-battery applications. Ionics 25, 2171–2181 (2019). https://doi.org/10.1007/s11581-018-2679-z

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