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Kinetic analysis of lithium-proton exchange reaction of LiNi0.88Co0.09Al0.03O2 positive electrode materials for lithium-ion battery recycling
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DOI：10.1093/bulcsj/uoag041.png)
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Abstract
En 中文
Recycling of lithium (Li)-ion batteries has become an urgent issue, particularly the recycling of layered positive electrode materials containing rare elements is of significant importance. Therefore, the development of simple and efficient recycling methods is highly demanded. Previously, we proposed a recycling method via Li+-H+ exchange reaction, in which immersing layered materials in an oxidizing aqueous solution transforms them to corresponding oxyhydroxides as precursors. In this study, to optimize the recycling process, we conducted immersion experiments using the layered positive electrode material of LiNi0.88Co0.09Al0.03O2 (NCA) and analyzed the reaction kinetics. X-ray diffraction analysis revealed that the exchange reaction proceeds in 2 steps: Li+ extraction from NCA followed by transition-metal oxyhydroxide (MOOH) formation caused by the Li+-H+ exchange reaction. Furthermore, the Li+ extraction reaction followed first-order kinetics, and the reaction rate constants obeyed the Arrhenius equation with an activation energy of 50 kJ mol-1. The kinetic equation derived in this study contributes to a fundamental understanding of the exchange reaction mechanism of layered materials and is expected to support the practical application of recycling layered materials via Li+-H+ exchange reaction.
Keywords:
layered positive electrode materials
lithium-ion battery recycling
lithium-proton exchange reaction
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