Analisis Pengaruh Penambahan Dopan Aluminium pada Katoda LiNi0,8Mn0,1Co0,1O2 (NMC 811) Terhadap Performa Baterai Litium Ion

Anggraini, Bagus (2024) Analisis Pengaruh Penambahan Dopan Aluminium pada Katoda LiNi0,8Mn0,1Co0,1O2 (NMC 811) Terhadap Performa Baterai Litium Ion. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada saat ini, baterai menjadi suatu hal terpenting dalam pengembangan kendaraan listrik. Salah satu jenis baterai yang diprediksi banyak digunakan adalah baterai dengan katoda LiNi0,8Mn0,1Co0,1O2 (NMC 811) karena biaya produksinya murah dan kapasitas spesifiknya tinggi. Namun, jenis katoda ini masih memiliki permasalahan yaitu kapasitas retensinya masih cukup rendah. Salah satu cara yang digunakan untuk meningkatkan kestabilan siklus kerja yang berdampak pada kapasitas retensinya adalah dengan pendopingan. Al(OH)3 dipilih sebagai dopan karena memiliki jari-jari ionik Al3+ sebesar 0,54 Å sehingga memungkinkan untuk mensubstitusi atom Ni, Mn, Co yang mempunyai jari ionik Ni2+ = 0,69 Å, Co3+ = 0,545 Å, dan Mn4+ = 0,53 Å dimana perbedaan jari-jari atom dari unsur yang terlibat tidak lebih dari 15% Berdasarkan data tersebut, penelitian ini dilakukan untuk menganalisa pengaruh doping Al(OH)3 terhadap kapasitas retensinya. Penelitian ini dilakukan dengan metode ko-presipitasi. Metode ini melibatkan pembentukan senyawa baru melalui proses pencampuran dan pengendapan. Penelitian ini juga akan menganalisa morfologi, karakteristik struktur kristal dan performa katoda NMC 811 dan NMC 811 didoping Al(OH)3 sebesar 2,5%, 5%, dan 7,5% mol. Secara keseluruhan, hasil penelitian ini menunjukkan bahwa NMC811 yang didoping Al(OH)3 memiliki kapasitas retensi yang lebih tinggi dibandingkan NMC811 tanpa doping. Kapasitas retensi baterai terbesar terdapat pada katoda NMC811-2,5%Al sebesar 76,19%, sedangkan kapasitas retensi baterai terkecil terdapat pada katoda NMC811 tanpa doping sebesar 57,74% dengan c-rate 0,5C pada 75 siklus. Penambahan dopan Al(OH)3 cenderung meningkatkan reversibilitas reaksi reduksi-oksidasi selama siklus charge-discharge, terlihat dari selisih puncak potensial redoks terkecil diperoleh pada sampel NMC811-2,5%Al sebesar 1,81 V. Sedangkan selisih puncak potensial redoks terbesar diperoleh pada sampel NMC811 tanpa doping sebesar 2,25 V. Berdasarkan data pengukuran EIS, nilai konduktivitas ion tertinggi didapatkan pada sampel NMC811-2,5% Al sebesar 0,908 S/cm. Dimana dengan konduktivitas ion yang tinggi akan mempermudah proses interkalasi dan deinterkalasi ion Li+.
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Currently, various electric car manufacturers have flocked to innovate cheap and environmentally friendly electric vehicles. One of the things that is of greatest concern in the electric vehicle industry is the development of batteries as an energy storage system. One type of battery that is predicted to be widely used is a battery with a LiNi0,8Ni0,1Co0,1O2 (NMC 811) cathode because its production costs are cheap and its specific capacity is high. However, this type of cathode still has problems, namely its retention capacity is still quite low. One method used to increase the stability of the working cycle which has an impact on its retention capacity is by doping. Al(OH)3 was chosen as the dopant because it has an Al3+ ionic radius of 0.54 Å, making it possible to substitute Ni, Mn, Co atoms which have an ionic radius of Ni2+ = 0.69 Å, Co3+ = 0.545 Å, and Mn4+ = 0 .53 Å where the difference in atomic radii of the elements involved is no more than 15%. Based on these data, this research was carried out to analyze the effect of Al(OH)3 doping on its retention capacity. This research was synthesized using the co-precipitation method. This research will also analyze the morphology, crystal structure characteristics and performance of NMC 811 and NMC 811 cathodes doped with Al(OH)3 at 2.5%, 5% and 7.5% mol. Overall, the results of this study indicate that NMC811 doped with Al(OH)3 has a higher retention capacity than NMC811 without doping. The largest battery retention capacity is found in the NMC811-2.5%Al cathode at 76.19%, while the smallest battery retention capacity is found at the NMC811 cathode without doping at 57.74% with a c-rate of 0.5C at 75 cycles. The addition of the Al(OH)3 dopant tends to increase the reversibility of the reduction-oxidation reaction during the charge-discharge cycle, as can be seen from the smallest redox potential peak difference obtained in the NMC811-2.5%Al sample of 1.81 V. Meanwhile, the largest redox potential peak difference was obtained on the NMC811 sample without doping it was 2.25 V. Based on EIS measurement data, the best ion conductivity value was obtained on the NMC811-2.5% Al sample of 0.908 S/cm. Where high ion conductivity will affect the intercalation and deintercalation process of Li+ ions.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Baterai Litium, NMC 811, Dopan, Al(OH)3, Lithium Battery
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2921 Lithium cells.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Bagus Anggraini
Date Deposited:	14 Feb 2024 00:04
Last Modified:	14 Feb 2024 04:03
URI:	http://repository.its.ac.id/id/eprint/107012

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