Journal
METALS
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/met11091336
Keywords
cathode active materials; selective lithium leaching; roasting
Funding
- Technology Innovation Program (Development of Material Component Technology) [2011183]
- Ministry of Trade, Industry, and Energy, Republic of Korea
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This study proposes a new method for selective leaching and recovery of lithium from spent batteries, achieving over 80% lithium leaching through a roasting process after nitric acid deposition. The research findings indicate that high-purity lithium nitrate can be obtained under specific conditions.
Recently, many studies have been conducted on the materialization of spent batteries. In conventional cases, lithium is recovered from an acidic solution through the leaching and separation of valuable metals; however, it is difficult to remove impurities because lithium is recovered in the last step. Cathode active materials of lithium-ion batteries comprise oxides with lithium, such as LiNixCoyMnzO2 and LiCoO2. Thus, lithium should be converted into a compound that can be leached in deionized water for selective lithium leaching. Recent studies on the leaching and recovery of Li2CO3 through a carbon reduction reaction show low economic efficiency, due to the solubility of Li2CO3 at room temperature being as low as 13 g/L. This paper proposes a method of roasting after nitric acid deposition for selective lithium leaching and recovery to LiNO3. Based on experiments involving the varying of the amount of nitric acid, roasting temperature, and solid-liquid ratio, optimal values were found to be dipping in 10 M HNO3 2 mL/g, roasting at 275 degrees C, and deionized water with a solid-liquid ratio of 10 mL/g, respectively. Over 80% Li leaching was possible under these conditions. IC analysis confirmed that the purity was 97% lithium nitrate.
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