BALL-MILLED NI-CO-MN OXIDES FROM SPENT LI-ION BATTERIES AS ELECTROCATALYST FOR OXYGEN EVOLUTION REACTION

• Main Author: Balqis, Falihah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/64837
• Institution: Institut Teknologi Bandung

The escalation of Li-ion battery demand in the last decade starts to be concerning as the waste also increases. One of the solutions to process battery waste is to hydrometallurgically leach the electrode to obtain transition metals for broader applications, specifically for LiNixCoyMnzO2 (NCM) batteries. This research focuses on Ni-Co-Mn oxalates from spent Li-ion battery were mechanochemically treated using ball milling to build metal-organic frameworks (MOF) of metal-trimesic acid. Afterward, it was calcined to prepare Ni-Co-Mn oxides, which are well-known for their potential as oxygen evolution reaction electrocatalyst. The catalyst exhibited an overpotential of 372 mV, a Tafel slope of 38.38 mV dec-1, and remained stable over 30,000 s at 10 mA cm-2. It was also applicable as air cathode in a rechargeable Zn-air battery, showing a power density of 85.42 mW cm-2 and a good stability for 100 h (300 cycles). Hence, battery waste offers high potential for value-added materials, specifically enabling its wide applicability in electrocatalysis.