Evaluation of Dissolution Conditions of Li-Ion Battery Cathode Material in Nitric Acid

Abstract

In this study, recycling conditions of metallic materials and graphite from waste Li-ion cathodes are evaluated by using nitric acid solution. Li-ion cathode material is leached in nitric acid solution and leaching efficiency is studied in the present study. Parameters that affect the leaching efficiency, solid-liquid ratio, leaching time, H2O2 addition are investigated by relationship with leaching efficiency. Investigations show that optimal leaching conditions are 2 hours leaching time, 100 g/L solid-liquid ratio and 3M nitric acid solution. In 2M nitric acid solution addition of H2O2 is found to increase the efficiency however a satisfying leaching efficiency could not be reached.

Keywords

• Recycling
• Li-ion battery
• Waste battery
• Leaching

Li İyon Pil Katot Nitrik Asitte Çözünme Koşullarının Belirlenmesi

Öz

Bu çalışmada atık lityum-iyon pil katot malzemesinin nitrik asit çözeltisinde çözülerek metalik malzemeler ile grafitin geri kazanım koşulları belirlenmiştir. Yapılan çalışmada atık Li-iyon katot malzemesi farklı molaritelere sahip nitrik asit çözeltisinde liç edilmiş ve metallerin çözünme verimi araştırılmıştır. Çözünme verimini etkileyen katı-sıvı oranı, çözünme süresi, H2O2 katkısı parametrelerinin çözünme verimi üzerindeki etkisi incelenmiştir. Yapılan incelemeler sonucunda en uygun çözme koşullarının 2 saat liç süresi, 100 g/L katı-sıvı oranı ve 3M nitrik asit çözeltisi olduğu tespit edilmiştir. H2O2 katkısının incelendiği 2M nitrik asit çözeltisinde H2O2 katkısının olumlu etkisinin olmasına karşılık yeterli çözünme verimine ulaşılamadığı görülmüştür.

Anahtar Kelimeler

• Geri dönüşüm
• Li-iyon pil
• Atık pil
• Liç

Kaynakça

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