RECYCLING METHOD OF WASTE LITHIUM MANGANATE CATHODE MATERIALS
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United States of America Patent
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Jan 23, 2025
app pub date -
Jul 31, 2024
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Jul 31, 2024
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Abstract
A recycling method of waste lithium manganate cathode materials is provided. The recycling method includes: firstly, mixing the waste lithium manganate cathode materials with sulfuric acid for hydrothermal reaction, to obtain manganese dioxide and washing solution; then reacting the washing solution with ammonium bicarbonate, to obtain manganese carbonate and lithium sulfate; and mixing the manganese dioxide, lithium sulfate and lithium hydroxide monohydrate, then performing a sintering treatment, washing and a tempering treatment in sequence, to obtain recycled lithium manganate cathode materials. The recycling method can obtain manganese dioxide, spherical manganese carbonate and lithium sulfate by adjusting the reaction temperature and reaction time, realizing the effective recovery of manganese and lithium. The lithium manganate cathode materials can be re-prepared by using the recovered manganese and lithium and adding lithium hydroxide monohydrate, and the lithium manganate cathode materials have excellent electrochemical performance.
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