Pelapisan Nanofiber PVA Dengan Larutan GO Menggunakan Metode Pencelupan Sebagai Separator Baterai Lithium-Ion

Coating of PVA Nanofibers with GO Solution Using Dipping Method as Lithium-Ion Battery Separator

Karakteristik separator pada baterai litium-ion harus memiliki porositas memadai, konduktivitas tinggi dan stabilitas termal baik. Berdasarkan penelitian sebelumnya pembuatan separator dari Polivinil Alkohol (PVA) dikompositkan dengan Graphene Oxide (GO) didapatkan nilai konduktivitas ionik rendah jika PVA/GO dikompositkan secara langsung menggunakan metode elektrospining. Untuk itu, perlu pengkajian lebih lanjut tentang sintesis nanofiber PVA/GO sebagai separator menggunakan metode yang berbeda. Berdasarkan permasalah tersebut didapatkan tujuan penelitian ini yaitu menganalisis karakteristik separator PVA/GO sebagai separator baterai lithium-ion dan menganalisis pengaruh waktu pencelupan terhadap karakteristik separator PVA/GO sebagai separator baterai lithium-ion. Sintesis nanofiber PVA menggunakan metode elektrospining, hasil nanofiber PVA dilakukan metode pencelupan kedalam larutan GO, kemudian hasilnya akan dikarakterisasi DTA-TGA, FTIR, SEM-EDX, Uji Porositas, Wettability, dan LCR Meter. Hasil penelitian menunjukkan bahwa separator PVA/GO memiliki stabilitas termal pada suhu kurang dari 317,35°C, porositas bernilai rentang 62% - 66%, memiliki sifat hidrofilik, dan nilai konduktivitas listrik antara (2,036 × 10^−3 −2,203 × 10^−3) S/cm. Waktu pencelupan mempengaruhi karakteristik separator PVA/GO sebagai separator baterai lithium-ion, yaitu pada porositas dimana semakin lama waktu pencelupan nilai porositas semakin rendah, sehingga sudut kontak penyerapan elektrolitnya semakin besar. Selain itu, waktu pencelupan juga mempengaruhi nilai konduktivitas listrik, dimana semakin lama waktu pencelupan maka nilai konduktivitas listrik semakin kecil.

Kata kunci: nanofiber, pencelupan, separator baterai.

The characteristics of the separator in lithium-ion batteries must have adequate porosity, high conductivity and good thermal stability. Based on previous studies on the manufacture of separators from Polyvinyl Alcohol (PVA) composited with Graphene Oxide (GO), low ionic conductivity values were obtained if PVA/GO was composited directly using the electrospinning method. For this reason, further studies are needed on the synthesis of PVA/GO nanofibers as separators using different methods. Based on these problems, the objectives of this study were to analyze the characteristics of PVA/GO separators as lithium-ion battery separators and to analyze the effect of immersion time on the characteristics of PVA/GO separators as lithium-ion battery separators. Synthesis of PVA nanofibers using the electrospinning method, the results of PVA nanofibers were carried out by immersion in GO solution, then the results were characterized by DTA-TGA, FTIR, SEM-EDX, Porosity Test, Wettability, and LCR Meter. The results showed that the PVA/GO separator has thermal stability at temperatures below 317.35°C, porosity ranges from 62% to 66%, has hydrophilic properties, and electrical conductivity values between (2,036 × 10^−3 − 2,203 ×10^−3)S/cm. The immersion time affects the characteristics of the PVA/GO separator as a lithium-ion battery separator, namely in porosity where the longer the immersion time the lower the porosity value, so that the contact angle of electrolyte absorption is greater. In addition, the immersion time also affects the electrical conductivity value, where the longer the immersion time the smaller the electrical conductivity value.

Keywords: nanofiber, immersion, battery separator.