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Ternary hybrid pvdf-hfppanigo polymer electrolyte membrane for lithium ion battery / Usaid Ur Rehman Farooqui

Ternary hybrid pvdf-hfppanigo polymer electrolyte membrane for lithium ion battery_Usaid Ur Rehman Farooqui_K4_2019_MYMY
Poli (vinilidina hexafluropropilina) PVDF-HFP merupakan komponen yang berpotensi sebagai pemisah dalam bateri ion litium kerana ketahanan kimianya yang sangat tinggi, kestabilan mekanikal dan haba yang besar beserta kos yang lebih rendah; walau bagaimanapun, komponen yang asalnya mempunyai ciri-ciri yang terhad dan memerlukan pengubahsuaian lanjut bagi mencapai prestasi yang diinginkan. Oleh itu, dalam penyelidikan ini, hibrid ternari PVDF-HFP/PANI/GO telah dibangunkan dan skop dibahagikan kepada tiga fasa yang pada permulaannya, dos polianilina (PANI) yang berbeza (1% berat, 2% berat, dan 3% berat) telah dicampur ke dalam matriks polimer PVDF-HFP bagi menghasilkan membran elektrolit PVDF-HFP/PANI dengan menggunakan kaedah nafas-bentuk. Penambahan PANI (2% berat) didapati mempengaruhi daya kekonduksian ionik di mana nilainya telah meningkat dari 1.98 × 10-4 S cm-1 bagi membran tunggal PVDF-HFP ke 1.04 × 10-3 S cm-1; walau bagaimanapun, kesan pengekstrakannya mengakibatkan kekuatan tegangan membran tunggal PVDF-HFP menurun dari 4.2 MPa hingga 2.8 MPa. Skop kedua, kesan grafina oksida (GO) dikaji dengan mevariasikan jumlah GO yang berbeza (1% berat, 2.5% berat dan 5% berat) ke dalam matriks polimer PVDFHFP. Penambahan GO (2.5% berat) meningkatkan kekuatan tegangan membrane PVDF-HFP dari 4.2 MPa hingga 12.5 MPa; walau bagaimanapun, ia menyebabkan kekonduksian ionik PEM tunggal diketepikan. Selanjutnya, bagi fasa ketiga, bahankomposit PANI/GO digabungkan atas faktor keunikan kedua-dua pengisi. PVDF HFP/ PANI hibrid ternari (2% berat)/GO (10% berat, 25% berat, dan 40% berat) PEM disintesis dan dicirikan untuk bateri ion litium. Ternari PVDF-HFP/PANI/GO yang diperolehi menunjukkan peningkatan kekuatan tegangan sehingga 8.8 MPa. Tambahan pula, membran ternari PVDFHFP/PANI/GO menunjukkan kestabilan terma yang luar biasa dengan Td sehingga 498°C, peningkatan morfologi, pengambilan elektrolit tertinggi (367.5%) dan keliangan yang sangat baik sekitar 89%. Selain itu, PEM bagi PVDF-HFP tunggal, PVDF-HFP/PANI dan PVDF-HFP/PANI/GO yang optimum telah digunakan untuk pencirian elektrokimia dan pemodelan. Selain itu model R-CPE memberikan kualiti yang sesuai dengan nilai MSE sekitar 5% berbanding model R-C dan R-L. Seterusnya, PEM optimum yang disediakan berjaya digunakan dalam bateri ion litium dan menunjukkan kapasiti khusus yang baik untuk 10 pusingan permulaan. Walau bagaimanapun, PEM ternari PVDF-HFP/PANI/GO menghasilkan kestabilan yang lebih baik berbanding dengan PEM lain; oleh itu, ia diuji selanjutnya untuk pengekalan kapasiti dan ia mengekalkan kapasiti melebihi 95% selepas 30 kitaran. Kesimpulannya, penggunaan membran ternari PVDF-HFP/PANI/GO merupakan pemisah yang berpotensi bagi bateri ion litium di masa hadapan. _______________________________________________________________________ Poly(vinylidene fluoride-co-hexafluoropropylene) PVDF-HFP is a promising candidate as a separator in lithium-ion batteries owing to its outstanding chemical resistance, high mechanical and thermal stability with lower cost; however, its pristine form has limited characteristics that require further modification to achieve enhanced performance. Therefore, in this research ternary hybrid PVDF-HFP/PANI/GO were develop and the scope were divided into three phase which at first, different dosages of polyaniline (PANI) (1 wt%, 2 wt%, and 3 wt%) are incorporated into PVDF-HFP polymer matrix to fabricate PVDF-HFP/PANI polymer electrolyte membrane by using breath-figure method. The PANI (2 wt%) inclusion influenced the ionic conductivity and enhanced it from 1.98 × 10-4 S cm-1 of pristine PVDF-HFP membrane to 1.04 × 10-3 S cm-1; however, its plasticizing effect resulted in tensile strength of pristine PVDF-HFP membrane from 4.2 MPa to 2.8 MPa. Secondly, the effect of graphene oxide (GO) is investigated by varying different amount of GO (1 wt%, 2.5 wt%, and 5 wt%) into PVDF-HFP polymer matrix. The GO (2.5 wt%) addition remarkably enhanced the tensile strength of PVDF-HFP membrane from 4.2 MPa to 12.5 MPa; however, it showed negligible effect on ionic conductivity of pristine PEM. Therefore, in third phase, PANI/GO composite material is combined for the unique properties of both the fillers. The ternary hybrid PVDFHFP/PANI (2 wt%)/GO (10 wt%, 25 wt%, and 40 wt%) PEMs are synthesized and characterized for lithium ion batteries. The obtained PVDF-HFP/PANI/GO ternary membrane showed a remarkable improvement in tensile strength up to 8.8 MPa. Furthermore, the PVDFHFP/PANI/GO ternary membrane exhibited outstanding thermal stability with Td up to 498°C, improved morphology, highest electrolyte uptake (367.5%) and an excellent porosity of around 89%. Moreover, the obtained optimum pristine PVDF-HFP, PVDFHFP/ PANI, and PVDF-HFP/PANI/GO PEMs were considered for further electrochemical characterization and modelling. Also, the R-CPE model provided a best quality fit with MSE value of around 5% compared to R-C and R-L model. Further, the prepared optimum PEMs is successfully applied in lithium ion battery and showed good specific capacity for initial 10 cycles. However, PVDF-HFP/PANI/GO ternary PEM resulted in better stability compared to other PEMs; therefore, it is tested for capacity retention and it retained over 95% capacity after 30 cycles. In conclusion, the proposed PVDF-HFP/PANI/GO ternary membrane is a potential candidate as a separator in future lithium-ion batteries.
Contributor(s):
Usaid Ur Rehman Farooqui - Author
Primary Item Type:
Thesis
Identifiers:
Accession Number : 875008838
Language:
English
Subject Keywords:
electrolyte; hexafluoropropylene; vinylidene
Sponsor - Description:
Pusat Pengajian Kejuruteraan Kimia -
First presented to the public:
4/1/2019
Original Publication Date:
8/7/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 191
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-08-07 10:35:43.554
Submitter:
Mohamed Yunus Yusof

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Ternary hybrid pvdf-hfppanigo polymer electrolyte membrane for lithium ion battery / Usaid Ur Rehman Farooqui1 2020-08-07 10:35:43.554