Lithiation-Aided Conversion of End-of-Life Lithium-Ion Battery Anodes to High-Quality Graphene and Graphene Oxide.
Lithiation-Aided Conversion of End-of-Life Lithium-Ion Battery Anodes to High-Quality Graphene and Graphene Oxide.
复制标题
DOI：
10.1021/acs.nanolett.8b04410
复制
发表时间：
2018-12
期刊：
影响因子：
10.8
通讯作者：
Yunya Zhang;Ningning Song;Jiajun He;Ruoxi Chen;Xiaodong Li
中科院分区：
文献类型：
--
作者：
Yunya Zhang;Ningning Song;Jiajun He;Ruoxi Chen;Xiaodong Li
在过去的二十年里，锂离子电池改变了世界的面貌。随着生产和使用的不断增加，大量的退役电池也产生了社会和环境问题，使电池的回收成为一项紧迫的任务。石墨烯具有优异的电子和机械性能，但用可行的工艺和低成本制备高质量的石墨烯仍然很困难。本文提出了一种巧妙地将退役锂离子电池阳极转化为石墨烯和氧化石墨烯的策略。在电池充放电过程中，由于锂离子在阳极石墨中的嵌入和脱嵌，废旧锂离子电池的石墨粉呈现出不规则的膨胀现象。这种预制工艺促进了石墨的化学和物理剥落。与未经处理的原始石墨制备的氧化石墨烯相比，阳极石墨制备的氧化石墨烯具有优异的均匀性和电化学性能。通过剪切混合，锂化辅助预膨胀使石墨烯生产率提高了4倍。此外，石墨烯的制造被无缝地插入到目前使用的电池回收流程中，其中酸处理被发现进一步膨胀石墨晶格，将石墨烯的生产率提高到83.7%（比原始石墨粉高10倍）。这一发现为利用废电池生产高质量石墨烯及其衍生物创造了新的机会。
In the past two decades, lithium-ion (Li-ion) batteries have transformed the appearance of the world. Along with the ever-increasing production and usage are the tremendous number of retired batteries, which have created social and environmental issues, making battery recycling an urgent task. Graphene has exhibited outstanding electronic and mechanical properties but it is still difficult to fabricate high-quality graphene with feasible procedures at low cost. Here, a strategy of smartly converting retired Li-ion battery anodes to graphene and graphene oxide is proposed. The graphite powders collected from end-of-life Li-ion batteries exhibited irregular expansion because of the lithium-ion intercalation and deintercalation in the anodegraphite during battery charge/discharge. Such prefabrication process facilitated both chemical and physical exfoliations of the graphite. Comparing with the graphene oxide derived from pristine, untreated graphite, the graphene oxide from anodegraphite exhibited superlative homogeneity and electrochemical properties. The lithiation aided pre-expansion enabled 4 times enhancement of graphene productivity by shear mixing. Furthermore, the graphene fabrication was seamlessly inserted into the currently used battery recycling streamline in which the acid treatment was found to further swell the graphite lattice, pushing up the graphene productivity to 83.7% (10 times higher than that of pristine graphite powders). The findings create new opportunities for capitalizing on waste batteries to produce high-quality graphene and its derivatives.