Abstract
Poly(vinylidene fluoride) (PVDF)/Ca–Al-layered double hydroxide(CAL) (PCL) nanocomposite-based nanofabrics were electrospun for application in lithium-ion batteries as gel polymer electrolyte (GPE). The nanofabric exhibited a high β-phase content of 82.79% after the addition of CAL that was synthesized by co-precipitation method. The PCL-based GPE exhibited enhanced electrochemical properties, such as high ionic conductivity, optimal Li-ion transference number, and improved electrolyte uptake due to the presence of a highly interconnected porous structure. The PCL GPE exhibited an ionic conductivity of 3.54 × 10–3 S cm−1 at ambient temperature, which is much higher than that of pristine PVDF and commercial Celgard® 2400 separators. Moreover, Li/PCL/LiCoO2 cell showed an initial discharge capacity of 140.31 mAh g−1, which is superior to that of PVDF and Celgard® 2400 separators. It also exhibited high coulombic efficiency retention of 99% after 30 cycles of charging. PCL-based GPE showed superior mechanical and low thermal shrinkage properties, indicating its suitability in battery separator application.
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Acknowledgments
Shamitha C would like to thank National Institute of Technology of Karnataka (NITK), India for a research fellowship. The authors thank Prof. Udaya Bhat. K and Dr. Ravishankar. K. S for providing the TEM and UTM facility. The authors are obliged to Ms. U. Rashmi and Mr. Prajwal for their valuable assistance in SEM and TEM. AV is grateful to the Ministry of Human Resource Development’s (MHRD), IMPRINT project grant number 7911 and Ministry of Road and Transport, India for financial support. The authors dedicate this paper to the memory of late Professor Sudipto Ghosh, Metallurgical & Materials Engineering, I.I.T Kharagpur, West Bengal, India.
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Shamitha, C., Janakiraman, S., Ghosh, S. et al. Synthesis and evaluation of a new gel polymer electrolyte for high-performance Li-ion batteries from electrospun nanocomposite of PVDF/Ca–Al-layered double hydroxide. Journal of Materials Research 37, 3942–3954 (2022). https://doi.org/10.1557/s43578-022-00700-4
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DOI: https://doi.org/10.1557/s43578-022-00700-4