Abstract The efficient reutilization of electrode materials in waste lithium-ion batteries (LIBs) is an urgent and tough problem that grows along with the rapid increase in the use of LIBs in various areas, including portable electronic products, electric vehicles and backup power supplies. Herein, we propose a promising way to recover the LiCoO2 positive electrode material from the recycled LIBs via structure restoration. The collected spent LiCoO2 powder is mixed with lithium salts and sintered to form a sophisticated layered structure. When Li2CO3 is added as the lithium source and the mole ratio of lithium to cobalt is controlled at 1.00 in the mixture, a layered structure of regenerated LiCoO2 could be preferably obtained at a calcination temperature of 800 °C. To improve the electrochemical performance of the regenerated LiCoO2, nanosized Al2O3 particles are coated on the surface of the regenerated LiCoO2. The Al2O3-coated and regenerated LiCoO2 demonstrates comparable properties to those of commercial LiCoO2 materials. The regeneration of spent LiCoO2 via structure restoration, which is demonstrated in the present study, provides an effective way to reuse cobalt metal directly without traditional leaching and re-synthesis procedures, which reduces energy consumption and contributes to the environmental protection.

中文翻译：

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通过结构修复直接从回收的锂离子电池中回收 LiCoO2

摘要 随着锂离子电池在便携式电子产品、电动汽车和备用电源等各个领域的使用迅速增加，废旧锂离子电池（LIBs）中电极材料的有效再利用是一个紧迫而棘手的问题。在此，我们提出了一种通过结构修复从回收的 LIB 中回收 LiCoO2 正极材料的有前景的方法。收集的废 LiCoO2 粉末与锂盐混合并烧结形成复杂的层状结构。当加入Li2CO3作为锂源，混合物中锂与钴的摩尔比控制在1.00时，在800℃的煅烧温度下可以较好地得到层状结构的再生LiCoO2。为了提高再生 LiCoO2 的电化学性能，纳米尺寸的 Al2O3 颗粒被涂覆在再生的 LiCoO2 表面。Al2O3 涂层和再生的 LiCoO2 表现出与商业 LiCoO2 材料相当的性能。本研究中展示的通过结构修复再生废 LiCoO2 提供了一种有效的方法，无需传统的浸出和再合成程序即可直接再利用钴金属，从而降低了能源消耗并有助于环境保护。