Recycling method of waste lithium manganate battery

Abstract

The invention discloses a recycling method of a waste lithium manganate battery. The method comprises the following steps: calcining the waste lithium manganate battery at high temperature in a closedinert atmosphere; cooling and taking out residues; crushing, screening and magnetically separating residues to obtain lithium manganate coarse powder; obtaining carbon powder and lithium manganate fine powder from the lithium manganate coarse powder through an airflow sorting device, adding a manganese source, a lithium source and an additive into the lithium manganate fine powder, mixing the manganese element, the lithium element and doped ions according to the molar ratio of 2:(1-1.08):(0-0.1), placing the mixture in an oxygen atmosphere for high-temperature sintering, and obtaining the lithium manganate material. According to the method, the waste lithium manganate battery is subjected to high-temperature calcination in a closed environment; tail gas treatment is facilitated, the pollution problem in the waste lithium battery disassembling process is solved, the production efficiency is improved, control substances such as acid and alkali do not need to be used in the subsequent production process, the lithium manganate positive electrode material can be regenerated only by adding raw materials and additives, and comprehensive utilization and clean production of the waste lithium manganate positive electrode material are achieved.

Description

technical field [0001] The invention relates to the field of resource utilization of waste batteries and environmental protection, in particular to a recycling method for lithium manganate waste batteries. Background technique [0002] With the rapid development of the new energy automobile industry and the development of China's lithium battery market, my country's power battery market will continue to maintain a high-speed development trend in the medium and long term; however, the service life of lithium batteries is limited. As far as power lithium batteries are concerned, theoretically, the cycle life is required to be more than 2000 times, and the service life is 7-8 years. In fact, the battery pack will be seriously degraded and scrapped after 5 years. With the rapid development of the industry, a large number of waste batteries will be produced; If the scrapped lithium batteries are not properly disposed of, it will not only cause a waste of resources, but also cause h...

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Problems solved by technology

[0002] With the rapid development of the new energy automobile industry and the development of China's lithium battery market, my country's power battery market will continue to maintain a high-speed development trend in the medium and long term; however, the service life of lithium batteries is limited. As far as power lithium batteries are concerned, theoretically, the cycle life is required to be more than 2000 times, and the service life is 7-8 years. In fact, the battery pack will be seriously degraded and scrapped after 5 years. With the rapid development of the industry, a large number of waste batteries will be produced; If the scrapped lithium batteries are not properly disposed of, it will not only cause a waste of resources, but also cause huge pollution to the environment. Although the used lithium-ion batteries do not contain mercury, cadmium, and lead in dry batteries and lead-acid batteries, which are more toxic heavy metal elements, but it contains lithium hexafluorophosphate (LiPF6), benzene, and ester compounds, which are difficult to be degraded by microorganisms;

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