Yustinus Purwamargapratala, a doctoral student in the Metallurgical and Materials Engineering program at FTUI, recommended a new type of lithium-ion battery cathode belonging to the NMC group with a stoichiometry of 5:4:1, obtained through a coprecipitation process to acquire the precursor and subsequent calcination. This dissertation was presented at the Open Doctoral Promotion Session of FTUI held on Wednesday (10/1) at the Smart Meeting Room, FTUI Dean’s Building.
“The need for energy storage devices has become essential because almost all modern technologies, such as lithium batteries, require energy storage media. Lithium batteries have advantages over nickel-metal hydride and nickel-cadmium, namely higher energy density. Therefore, lithium batteries play a crucial role in energy storage for various applications, from portable electronics to hybrid/electric vehicles and power grids,” said Yustinus during his presentation.
LiNixMnyCozO2 (NMC) batteries are among the highest-performing lithium-ion batteries in the market, combining three major metals with different compositions, namely nickel-manganese-cobalt. The high capacity is one of the reasons this cathode type is widely developed. Previous research has identified various NMC group cathodes, such as NMC 811, NMC 622, NMC 532, and NMC 111.
The high nickel content in NMC is closely related to safety and security. The higher the Ni content (fraction greater than 0.5), the weaker the battery’s resistance to heat effects. The composition of Mn is related to the stability of the battery’s active material, while Co is related to toxicity and high cost. Several solutions have been explored to address these weaknesses, such as creating molar ratios with lower nickel content, surface modification, and metal ion doping.
FTUI Dean, Prof. Dr. Heri Hermansyah, S.T., M.Eng., IPU, stated, “The rapid development of human civilization along with economic and technological growth has led to an increased need for energy consumption to meet these demands. Through this research, it is hoped that new material recommendations for energy storage devices with better material characteristics can be provided.”
Through this dissertation, Yustinus Purwamargapratala successfully earned a Doctorate degree with Summa Cum Laude honours with a GPA of 3.95. He is the 68th Doctoral graduate from the Department of Metallurgical and Materials Engineering and the 531st Doctoral graduate from the Faculty of Engineering, Universitas Indonesia.
The doctoral promotion session was chaired by the Session Chair, Prof. Ir. Mahmud Sudibandriyo, M.Sc., Ph.D., with the Supervisor, Prof. Dr. Ir. Anne Zulfia Syahrial, M.Sc., and Co-Supervisor, Prof. Dr.rer.nat. Evvy Kartini. The Internal Examiner Team consisted of Prof. Dr. Ir. Johny Wahyuadi M. DEA, Dr. Ir. Bambang Priyono, MT., Drs. Nofrijon Sofyan, M.Si., Ph.D., and Dr.Ing. Eko Adhi Setiawan. The External Examiner Team included Prof. Dr. Rike Yudianti, a Research Professor at the National Research and Innovation Agency.
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