Publication: Lityum-iyon piller için poliüretan esaslı esnek jel polimer elektrolit
Abstract
Piller, taşınabilir elektronik cihazlar, elektrikli arabalar, tıbbi aletler gibi birçok uygulama alanında kullanılmaktadır. Pil teknolojisinin gelişimi, 17. yüzyıldan bu yana uzun bir yolculuk geçirerek, 1991 yılında lityum iyon pillerin Sony tarafından ticarileştirilmesine kadar giden yolu açmıştır. Şarj edilebilir lityum iyon piller, diğer alkali metallere kıyasla yüksek enerji yoğunlukları nedeniyle taşınabilir uygulamalar için en uygun pil türüdür. Pillerde elektrolit, anot ve katot arasında meydana gelen kimyasal reaksiyonlarda iyonları taşıyabilen, genellikle bir sıvı veya jel olan maddedir. Lityum iyon pillerde elektrolit; güncel yoğunluğu, zaman kararlılığını, bataryanın güvenilirliğini ve özellikle lityum-iyon pil güvenliğini belirlemek için anahtar faktördür. Geleneksel sıvı elektrolitlerin polimer elektrolit ile değiştirilmesi, lityum bazlı pillerin güvenlik sorunlarının üstesinden gelmek için umut verici bir yöntem olarak kabul edilmiştir. Ayrıca, ticari sıvı elektrolitlerle karşılaştırıldığında, jel polimer elektrolitlerin ana avantajları sızıntı yapmayan doğası ve daha yüksek termal stabilitesi olup esnek, daha ince ve daha küçük elektrokimyasal cihazlar hazırlamak için de kullanılabilirler. Bu çalışmada, Poliüretan Akrilat (PUA)-Poliüretan Metakrilat (PUMA) esaslı, pentaeritritol tetrakis (3-merkaptopropionat), 3-merkaptopropil trimetoksisilan, Vinil fosfonik Asit ve Bis [2-(metakriloiloksi)etil)] fosfat bileşenleri içeren membranlar, tiyol-en klik reaksiyonu ve serbest radikal polimerizasyonu ile UV çapraz bağlama metoduyla sentezlenmiş ve lityum-iyon pillerde kullanılmak üzere jel elektrolitler hazırlanmıştır. Hazırlanan membranların termal, mekanik, yapısal ve elektrokimyasal özellikleri karakterize edilmiştir. Membranların elektrokimyasal testleri düğme pil tipi hücreler kapatılarak gerçekleştirilmiştir.
Batteries are used in many application areas such as portable electronic devices, electric cars, medical instruments. Advancements in battery technology have progressed over time leading to the introduction of commercially viable lithium-ion batteries by Sony in 1991. Lithium-ion batteries, which offer superior energy density compared to other alkali metals, have emerged as the ideal choice for portable applications. In batteries, the electrolyte is a substance, usually a liquid or gel, that can carry ions in the chemical reactions that occur between the anode and the cathode. Electrolyte in lithium-ion batteries; is the key factor for determining current density, time stability, battery reliability and especially lithium-ion battery safety. Replacing traditional liquid electrolytes with polymer electrolyte has been recognized as a promising method to overcome the safety issues of lithium-based batteries. Moreover, compared to commercial liquid electrolytes, the main advantages of gel polymer electrolytes are their leak-proof nature and higher thermal stability, and they can also be used to prepare flexible, thinner and smaller electrochemical devices. In this study, Polyurethane Acrylate (PUA)-Polyurethane Methacrylate (PUMA) based, membranes containing monomers such as pentaerythritol tetrakis (3-mercaptopropionate), 3-mercaptopropyl trimethoxysilane, Vinyl phosphonic Acid and Bis[2(methacryloyloxy)ethyl)] phosphate were synthesized by UV crosslinking method by thiol-ene click reaction and free radical polymerization and gel electrolytes were prepared for use in lithium-ion batteries. The thermal, mechanical, structural and electrochemical properties of the prepared membranes are characterized. Electrochemical tests of the membranes were performed by assembling the coin cells.
Batteries are used in many application areas such as portable electronic devices, electric cars, medical instruments. Advancements in battery technology have progressed over time leading to the introduction of commercially viable lithium-ion batteries by Sony in 1991. Lithium-ion batteries, which offer superior energy density compared to other alkali metals, have emerged as the ideal choice for portable applications. In batteries, the electrolyte is a substance, usually a liquid or gel, that can carry ions in the chemical reactions that occur between the anode and the cathode. Electrolyte in lithium-ion batteries; is the key factor for determining current density, time stability, battery reliability and especially lithium-ion battery safety. Replacing traditional liquid electrolytes with polymer electrolyte has been recognized as a promising method to overcome the safety issues of lithium-based batteries. Moreover, compared to commercial liquid electrolytes, the main advantages of gel polymer electrolytes are their leak-proof nature and higher thermal stability, and they can also be used to prepare flexible, thinner and smaller electrochemical devices. In this study, Polyurethane Acrylate (PUA)-Polyurethane Methacrylate (PUMA) based, membranes containing monomers such as pentaerythritol tetrakis (3-mercaptopropionate), 3-mercaptopropyl trimethoxysilane, Vinyl phosphonic Acid and Bis[2(methacryloyloxy)ethyl)] phosphate were synthesized by UV crosslinking method by thiol-ene click reaction and free radical polymerization and gel electrolytes were prepared for use in lithium-ion batteries. The thermal, mechanical, structural and electrochemical properties of the prepared membranes are characterized. Electrochemical tests of the membranes were performed by assembling the coin cells.