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- In relation to this article, we declare that there is no conflict of interest.
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Received January 4, 2025
Revised February 3, 2025
Accepted February 4, 2025
Available online May 1, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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폐망간전지에서 재활용된 Mn3O4의 수분 방출 방지 특성을 활용한 리튬-공기 전지 촉매 응용
Recycled Mn3O4 from Spent Manganese Batteries as Electrocatalysts for Lithium-Air Batteries with Water Release Prevention
https://doi.org/10.9713/kcer.2025.63.2.105117
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Abstract
폐망간 전지에서 추출한 Mn3O4는 리튬-공기 전지의 전기화학 촉매로 활용되어 안정적인 성능을 보였다. Mn3O4는 안정적인 스피넬 구조를 형성하여 방전 과정에서 추가적인 수분 방출이 없으며, 이는 전극 부식 및 전해질 부반응을 방지하고 안정적인 사이클 성능을 제공한다. Mn3O4는 γ-MnO2에 비해 완만한 초기 충전 곡선을 보여주며, 이는 Mn3O4가 Li2O2를 분해하기 위한 전기 촉매 활성이 있음을 나타낸다. 또한, Mn3O4는 30사이클까지 안정적인 성능을 유지한 반면, γ-MnO2는 18사이클 이후부터 불안정한 방전 용량을 보여준다. 이러한 결과는 Mn3O4가 수분 방출을 소재 구조적으로 방지함으로써 전지의 불안정성을 최소화하고 경제성과 내구성을 겸비한 촉매로써 활용가능함을 보여준다. 더나아가, 폐망간 전지의 효율적 재활용 및 리튬-공기 전지 실용화를 위한 새로운 기술적 가능성을 제시한다.
Mn3O4 extracted from spent manganese batteries demonstrated stable performance as an electrocatalyst for lithium-air batteries. Mn3O4 forms a stable spinel structure that prevents ad itional water release during the discharge process, effectively mitigating electrode corrosion and electrolyte side reactions while ensuring reliable cycling performance. Compared to γ-MnO2, Mn3O4 exhibits a gentler initial charging curve, suggesting superior electrocatalytic activity for Li2O2 decomposition. Furthermore, Mn3O4 maintained consistent performance for 30 cycles, whereas γ-MnO2 showed significant discharge instability after 18 cycles. These findings underscore that Mn3O4 prevents water release through its intrinsic structural stability, reducing operational instability while providing both cost-effective and durable catalytic performance. Moreover, this study highlights the feasibility of Mn3O4 as an electrocatalyst for the efficient recycling of spent manganese batteries and its real-world application in lithium-air batteries.
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