Efficient Separation of Aluminum Foil and Cathode Materials from Spent Lithium-Ion Batteries Using a Low-Temperature Molten Salt
Efficient Separation of Aluminum Foil and Cathode Materials from Spent Lithium-Ion Batteries Using a Low-Temperature Molten Salt
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DOI：
10.1021/acssuschemeng.8b06694
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发表时间：
2019-04
影响因子：
8.4
通讯作者：
Mengmeng Wang;Quanyin Tan;Lili Liu;Jinhui Li
中科院分区：
文献类型：
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作者：
Mengmeng Wang;Quanyin Tan;Lili Liu;Jinhui Li
铝箔与正极材料的有效分离是废旧锂离子电池回收的关键问题。先前的研究已经表明，有机粘合剂聚偏二氟乙烯（PVDF）在阴极材料和废LIB的Al箔之间提供的强结合力使得难以从Al箔剥离阴极材料，从而降低了金属回收过程的有效性。本研究报告了一种用于熔融有机粘结剂PVDF的低温熔盐技术。结果表明，AlCl 3-NaCl体系是一种无毒的反应介质，可有效地熔融PVDF，且由于储热引起的熔盐相变，对环境友好。阴极材料剥离的最佳工艺条件为：温度160 °C、熔盐与阴极电极质量比10：1、保温时间20 min。
The effective separation of aluminum (Al) foil and cathode materials is a critical issue for the recycling of spent lithium-ion batteries (LIBs). Previous studies have shown that the strong binding force provided by the organic binder polyvinylidene fluoride (PVDF) between the cathode materials and the Al foil of spent LIBs makes it difficult to peel off the cathode materials from the Al foil, reducing the effectiveness of the metal recovery process. This study reports on a low-temperature molten salt technology for melting the organic binder PVDF. The results showed that an aluminum chloride-sodium chloride (AlCl3-NaCl) system—a nontoxic reaction medium—could melt PVDF efficiently and is environmentally friendly as well, because of the phase transformation of molten salt caused by heat storage. The optimal conditions for peeling off cathode materials were a temperature of 160 °C, molten salt:cathode electrode mass ratio of 10:1, and holding time of 20 min. The highest peeling off percentage of cathode ma...