Investigation of flexible electrochemical storage with Li+/PVdF-HFP/PEO blend

ABSTRACTABSTRACTDesign and development of lithium ion batteries with flexible solid polymer electrolyte along with high ionic conductivity is crucial and challenging so as to protect from electrical short circuits within electrochemical devices. The present research work describes the fabrication of lithium based solid polymer electrolytes (LSPEs) using polymer blends of poly (vinylidene fluoride- hexafluoropropylene) (PVdF-HFP), poly (ethylene oxide) (PEO) with selective weight ratios of lithium trifluoromethanesulfonate (LiCF3SO3) salt by using solution-cast approach. The scanning electron microscopy (SEM) exposed morphology of LSPE membranes depicts crosslinking of polymer network with salt elevates strong dissociation behavior of LiCF3SO3. The amorphous behavior of LSPEs explored using X-ray diffraction (XRD) crystallographs clearly accommodates reduction of average crystallite size from 10─6 m to 10─9 m. The complexation studies, bond length and force constants calculations, interaction of ions, ionic pairs and aggregates of LiCF3SO3 in LSPE films were briefly analyzed using Fourier transform infrared spectroscopy (FTIR). IR modes correspond to [δs (SO3)], [υas (SO3)], [υas (CF3)], and amorphous phase of PVdF-HFP results in complexation, whereas IR modes correspond to [δas (SO3)], [δs (CF3)], [δas (CF3)], [υs (SO3)], C=O and β-phase of PVdF-HFP attributes ionic pairs and aggregation phenomena. The [υs (SO3)] mode contribution toward ionic conductivity was detailed. The ionic conductivity (σionic) values were estimated using Electrochemical impedance spectroscopy (EIS). The σionic values were enhanced from 10─7 S/cm to 10─4 S/cm as salt concentration increases. Charge accumulation, ionic strength, and transference number analysis of LSPE membranes were investigated using Chronoamperometry and Cyclic Voltammetry. Further, we have fabricated flexible electrochemical storage device (FESD) which are accentuating carriers of smart electronics technology (SET) in terms of foldable and stretchable electronic devices. We have explored discharge characteristics of our FESD with an average discharge current of 3 mA for 25 hours and denoted using 0.04C rating.KEYWORDS: EIS etcFESDFTIRLSPESEMSETXRD AcknowledgmentsWe sincerely thank HOD, and BOS of Department of Physics, Osmania University, for continuous constant support. Mr. P. Ajay Kumar sincerely thanks Sri T. Ram Mohan, Principal, Government Polytechnic, Gadwal, for his encouragement and immense support. We cordially thank Dr. K. Uday Kumar, Assistant Professor, NIT, Warangal, for his enormous support in chronoamperometry, cyclic voltammetry studies.Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationNotes on contributorsP. Ajay KumarMr. P. Ajay Kumar is a Research Scholar under the supervision of Prof. J. Siva Kumar at the Department of Physics, Osmania University. He is also working as a Lecturer in Physics at the Government Polytechnic, Gadwal, Department of Technical Education, Telangana. He earned his M.Sc. (Physics) from Osmania University in Hyderabad. He was awarded the Prof. N. Rajeshwara Rao Memorial Gold Medal, as well as the B. Hayagreevarao and Revathi Gold Medal, for ranking first in M.Sc. at Osmania University's 79th Convocation. He has qualified State Eligibility Test (APSET-2012) and also National Eligibility Test (CSIR-UGC NET-2014). He has one year degree level, ten years of diploma level teaching experience and seven years of research experience in the fields of nanocomposite based polymer electrolytes, electrochemical storage devices, optics, and laser spectroscopy. He has published several research papers in international journals and conferences.A. MallikarjunA Mallikarjun, Research scholar, Jawaharlal Nehru Technological University, Hyderabad, Telangana under the supervision of Prof. J. Siva Kumar, Department of Physics, Osmania University, and He also working as an Assistant Professor of Physics, Vignan Institute of management and Technology for Women's, Hyderabad, Telangana State, India. He is pursuing a Ph.D. from Jawaharlal Nehru Technological University Hyderabad, Telangana. He has Published several papers in reputed International Journals and Conferences. He attended and delivered number of oral presentations at various conferences. His research fields of interest are nano composite polymer materials synthesis, characterization, and application to electrochemical devices such as Batteries, Solar cells etc.Maheshwar Reddy MettuMr. Maheshwar Reddy Mettu, Research scholar, under the supervision of Prof. J. Siva Kumar, Department of Physics, Osmania University, and also working as an Assistant Professor of Physics, Sreenidhi Institute of Science and Technology, Hyderabad, Telangana State, India. He did his M. Sc. in 2003 from Osmania University and submitted thesis to Osmania University for the award of Ph.D. He has Published 21 papers in reputed International Journals. He attended and delivered number of oral presentations at various conferences. His research fields of interest are nano composite polymer materials synthesis, characterization, and application to electrochemical devices such as batteries, Solar cells etc.P. Anand Kumar SagarMr. P. Anand Kumar Sagar has obtained his M.Sc. (Organic Chemistry) degree from Osmania University, Hyderabad. He has received a university gold medal in M.Sc. from Osmania University from the hands of the then honourable Governor of Telangana State. He has eight years of research experience in the field of materials. He has published several research papers in international journals and conferences. Presently, he is working as Scientist 'B' in the Materials Research Laboratory.C. ThirmalDr. C. Thirmal has obtained his PhD from the Indian Institute of Technology (IIT) Madras in 2016, in the fields of ferroelectric polymers and magnetoelectrics. He worked as a postdoctoral research associate at IIT Delhi from 2016 to 2017. Then he joined as an assistant professor at the VNR Vignana Jyothi Institute of Engineering and Technology (VNRVJIET) in the physics discipline. He was granted a patent for his doctoral research work. He was awarded a Teachers Associate for Research Excellence (TARE) fellowship from DST-SERB for the duration of 2020–2023. He published 20 international journal papers in reputed journals. He also published six papers at various international and national conferences. He explores oxide and polymer materials for piezoelectric, ferroelectric, magnetoelectric, and battery applications. He is also an active IEEE-Member and faculty advisor for the IEEE-Nano Technology Council, VNRVJIET.M. Jaipal ReddyDr. M. Jaipal Reddy presently working as Professor, Chairman BOS in Physics, Department of Physics, Palamuru University, Mahabubnagar, Telangana State, India. Principal, PG Centre, Wanaparthy, Palamuru University, Mahabubnagar, Telangana State, India. He did his M. Sc., in 1988 and completed Ph.D. in Physics from Osmania University in 1997. He is having 25 years of Research/ Teaching experience. He was awarded various research fellowships by UGC, CSIR Government of India and National Science Council, Government of Taiwan. He delivered number of oral presentations/ plenary/ invited lectures in various conferences. He has Published 69 papers in reputed International Journals. He has guided for three candidates for their Ph. D. Degree under JNTUH. He is also serving as Technical Editor for Asian Journal of Materials Science, Research Journal of Nano Science & Nano Technology, Research Journal of Physics, Current Research in Physics, International Journal of Chemical Technology. He reviewed number of research papers for various Journals. He is Life member in Indian Science Congress, Indian Physics Association, Materials Research Society of India, Society for Advancement of Solid State Sciences, Osmania University Alumni Association, Member International Association of Engineers (IAENG), Hong Kong. His research fields of interest are Nano Materials synthesis and Characterization, Solid Ion conducting materials synthesis, characterization, and application to electrochemical devices such as batteries, Nano capacitors, Solar cells etc.J. Siva KumarProf. J. Siva Kumar, Retired Professor of Physics, Department of Physics, Osmania University, Hyderabad, Telangana State, Hyderabad. He did his M. Sc and Ph.D. from Osmania University, Hyderabad. He joined in the Osmania University in the year 1987, subsequently got promotions and became Professor of Physics in the year 2006. During his service, he helped the University in various capacities like coordinator, BOS member, Chairman BOS, Head and as Additional Controller of Examinations, etc. His research areas are polymer materials and thin films. He has published about 60 research publications in various reputed journals and attended number of conferences (National and International). He guided 07 students for their Doctorate Degree (Ph.D) and another 04 students are pursuing their research work.