Studi Pengaruh Variasi Arus Discharge terhadap Sifat Elektrokimia Baterai Ni-MH Tipe Sm1,5La0,5-Ni7 Made in Japan

Mundakir, Ivan Faza Averroes (2023) Studi Pengaruh Variasi Arus Discharge terhadap Sifat Elektrokimia Baterai Ni-MH Tipe Sm1,5La0,5-Ni7 Made in Japan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Terdapat banyak jenis baterai yang tersedia di pasaran, masing-masing baterai memiliki jenis material dan performa yang berbeda, contohnya baterai nickel metal hydride (Ni-MH) dan baterai lithium-ion (Li-ion). Baterai Ni-MH merupakan baterai rechargeable, baterai Ni-MH menggunakan paduan metal hydride sebagai elektroda negatif dan NiOOH sebagai elektroda positifnya. Namun, penggunaan baterai jenis Ni-MH tidak semasif baterai Li-ion, hal ini menyebabkan kurangnya pemahaman mengenai pemakaian baterai jenis Ni-MH, sehingga diperlukan penelitian mengenai pemakaian baterai Ni-MH.Penelitian menggunakan baterai Ni-MH tipe AA paduan metal A2B7 komposisi Sm1,5La0,5-Ni7 buatan Jepang dengan kapasitas 1900 mAh. Spesimen diuji performanya menggunakan pengujian chronopotentiometry (CP) sebanyak 50 siklus dengan variasi arus discharge 0,3 A dan 0,5 A. Pengujian terhadap karakteristik elektrokimia dilakukan dengan pengujian cylic voltammetry (CV), digunakan potential sweep 0 V hingga 1,8 V dan scan rate sebesar 0,0005 V/s. Pengujian electrochemical impedance spectroscopy (EIS) dengan rentang frekuensi 10.000 Hz hingga 0,01 Hz, amplitudo sebesar 0,01 V. Pengujian komposisi serta morfologi dan topografi penyusun elektroda negatif baterai menggunakan pengujian X-ray diffraction (XRD) dan scanning electron microscopy (SEM)
Pengaplikasian arus discharge 0,3 A dan 0,5 A sebanyak 50 siklus terhadap baterai Ni-MH tipe AA paduan metal A2B7 komposisi Sm1,5La0,5-Ni7 menghasilkan penurunan pada besaran kapasitas yang dapat disimpan baterai. Pengujian CP menunjukkan bahwa penggunaan arus 0,5 A menghasilkan penurunan kapasitas yang lebih besar dibandingkan arus 0,3 A. Pengujian CV memperlihatkan bahwa baterai baru; CP 0,3 A; dan CP 0,5 A bersifat reversible, nilai specififc capacitance juga sesuai dengan nilai CP yang menunjukkan penurunan pada baterai yang disiklus CP sebanyak 50 siklus. Pengujian EIS menunjukkan peningkatan nilai Warburg, hal ini menandakan difusivitas hidrogen menurun. Penurunan difusivitas hidrogen terjadi lebih besar pada baterai CP 0,5 A. Pengujian XRD menunjukkan penurunan crystallite size, penurunan lebih besar terjadi pada baterai CP 0,5 A. Pengujian SEM memperlihatkan crack serta ukuran partikel yang mengecil, ukuran partikel terkecil terlihat pada baterai CP 0,5 A. penurunan crystallite size dan ukuran partikel disebabkan oleh pulverization yang menyebabkan penurunan kapasitas dari baterai.
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There are many types of batteries available on the market, each has its own characteristics and performances, nickel metal hydrides (Ni-MH) and lithium ion (Li-ion) battery for example. Ni-MH batteries are rechargeable battery, Ni-MH batteries uses metal hydride alloy as the negative electrode and NiOOH as the positive electrode. However, the use of Ni-MH battery is not as massive as Li-ion battery. This causes a lack of understanding about Ni-MH batteries, therefore it is needed to conduct a research on the use of Ni-MH battery. This study used AA type A2B7 Ni-MH battery composed of Sm1,5La0,5-Ni7 made in Japan with a capacity of 1900 mAh. The specimens performance were tested using chronopotentiometry (CP) test for 50 cycles with a discharge current variation of 0,3 A and 0,5 A. Testing on the specimens electrochemical characteristic is done by cyclic voltammetry (CV) test with a potential sweep of 0 V to 1.8 V and a scan rate of 0.0005 V/s. Electrochemical impedance spectroscopy (EIS) test with a frequency range of 10,000 Hz to 0.01 Hz, and the amplitude used is 0.01 V. Composition, morphology, and topography test of the battery negative electrode components using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The application of discharge current of 0,3 A and 0,5 A for 50 cycles on AA type A2B7 Ni-MH battery composed of Sm1,5La0,5-Ni7 made in Japan reduces the amount of capacity that the battery can store. CP tests shows that the use of 0,5 A discharge current produces greater capacity reduction than the use of 0,3 A discharge current. CV tests shows that the new; CP 0,3 A; CP 0,5 A batteries are reversible, the value of specific capacitance is also in accordance with the value of CP which shows a decrease in the battery that was CP cycled for 50 cycles. EIS tests shows an increase in Warburg value, this indicates a decrease in hydrogen diffusivity. Greater amount of decrease in hydrogen diffusivity is shown by CP 0,5 A battery. XRD tests showed a decrease in crystallite size, a greater decrease occurred in the CP 0,5 A battery. SEM tests shows cracks and a reduce in particle size, the smallest particle size was seen in the 0,5 A CP battery. The decrease of crystallite size and particle size is caused by pulverization, causing the reduction of battery capacity.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baterai Ni-MH, Variasi Arus Discharge, Kapasitas, Komposisi Penyusun Elektroda Negatif, Pulverization; Ni-MH Battery, Discharge Current Variation, Capacity, Negative Electrode Composition, Pulverization
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2941 Storage batteries
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Ivan Faza Averroes Mundakir
Date Deposited:	14 Sep 2023 05:55
Last Modified:	14 Sep 2023 05:55
URI:	http://repository.its.ac.id/id/eprint/103215

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