Pengaruh Konsentrasi Kobalt Terhadap Performa Elektrokimia Baterai Ion Lithium LiNixMnᵧCo₁₋ₓ₋ᵧO₂ (x = 0,8) Variasi Co (5%, 7,5%, 10%, 12,5%)

Sari, Feti Febriani (2025) Pengaruh Konsentrasi Kobalt Terhadap Performa Elektrokimia Baterai Ion Lithium LiNixMnᵧCo₁₋ₓ₋ᵧO₂ (x = 0,8) Variasi Co (5%, 7,5%, 10%, 12,5%). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Material NMC (Nickel Manganese Cobalt) merupakan material yang banyak digunakan untuk pengembangan baterai ion lithium (LIB) karena kemampuannya untuk menyediakan keseimbangan antara kapasitas energi, daya tahan, dan biaya. Namun, penggunaan kobalt dalam NMC memiliki tantangan terkait harga yang tinggi dan dampak lingkungan akibat terbatasnya pasokan kobalt. Oleh karena itu, penelitian ini bertujuan untuk mensintesis material katoda NMC dengan variasi konsentrasi kobalt dan menganalisa pengaruhnya terhadap kinerja elektrokimia baterai ion lithium. Penelitian ini menggunakan metode ko-presipitasi dalam Continuous Stirred Tank Reactor (CSTR). Selanjutnya, material NMC yang telah disintesis digunakan untuk membuat sel koin baterai. Uji karakterisasi dilakukan dengan metode uji Electrochemical Impedance Spectroscopy (EIS) dan Cyclic Voltammetry (CV). Hasil pengujian EIS menunjukkan bahwa nilai hambatan charge-transfer (Rct) paling kecil terdapat pada sampel NMC 5% dan 7,5%, yaitu masing-masing sebesar 2803,8 Ω dan 2933,1 Ω. Selain itu nilai difusi ion lithium tertinggi juga dicapai oleh sampel dengan kadar kobalt 7,5% sebesar 9 x 10-12 cm2s-1 diikuti oleh sampel NMC 5% sebesar 4,3 x 10-12 cm2s-1. Berdasarkan hasil uji CV sampel NMC 5% memiliki nilai kapasitas spesifik (Cps) tertinggi sebesar 68 (F/g), kemudian NMC 7,5% juga menampilkan puncak redoks yang paling jelas. Hal ini mengindikasikan bahwa sampel dengan kadar kobalt yang lebih rendah dapat menghasilkan hambatan internal yang lebih kecil yang dikaitkan dengan tingkat homogenitas struktur katoda yang lebih tinggi. Pengurangan kandungan kobalt pada NMC diharapkan dapat diperoleh material yang lebih ramah lingkungan dan lebih terjangkau tanpa mengurangi kinerja baterai.
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Nickel Manganese Cobalt (NMC) is a widely used material in the development of lithium-ion batteries (LIBs) due to its ability to offer a balance between energy capacity, durability, and cost. However, the use of cobalt in NMC presents challenges related to its high cost and environmental concerns, stemming from limited supply. Therefore, this study aims to synthesize NMC cathode materials with varying cobalt concentrations and analyze their effects on the electrochemical performance of lithium-ion batteries. The synthesis was carried out using the co-precipitation method in a Continuous Stirred Tank Reactor (CSTR). The resulting NMC materials were then utilized to fabricate coin cell batteries. Characterization was conducted using Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry (CV) techniques. EIS testing revealed that the lowest charge transfer resistance (Rct) was observed in the NMC 5% and 7.5% samples, with values of 2803.8 Ω and 2933.1 Ω, respectively. In addition, the highest lithium-ion diffusion coefficient was achieved by the NMC 7.5% sample at 9 × 10⁻¹2 cm2s-1, followed by the NMC 5% sample with 4,3 × 10⁻¹2 cm2s-1. Based on the CV results, the NMC 5% sample exhibited the highest specific capacitance (Csp) at 68 F/g, while the NMC 7.5% sample displayed the most distinct redox peaks. These findings indicate that samples with lower cobalt content can result in lower internal resistance, which is associated with higher structural homogeneity in the cathode material.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Elektrokimia, Kobalt, LIB, NMC.Cobalt, Electrochemistry, LIB, NMC.
Subjects:	T Technology > TP Chemical technology > TP155.7 Chemical processes. T Technology > TP Chemical technology > TP156.C64 Controlled release technology T Technology > TP Chemical technology > TP255 Electrochemistry, Industrial.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Feti Febriani Sari
Date Deposited:	29 Jul 2025 06:24
Last Modified:	29 Jul 2025 06:24
URI:	http://repository.its.ac.id/id/eprint/122727

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