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焦耳热资讯

焦耳热资讯

调节闪蒸石墨烯的有序性后可用于快速充电锂离子电池

点击:0 时间:2023-02-16 08:03:03

石墨烯尚未大规模生产,因此基于石墨烯的实用快速充电锂离子电池(LIB)原型并不多见。石墨烯由于其无缺陷的原子排列而遭受长时间的面内和不利的深度锂扩散,导致作为LIB阳极的速率性能不令人满意。在这项工作中,进行了组合闪蒸焦耳加热和球磨处理,以实现石墨烯的克级生产(称为闪蒸石墨烯,FG)和石墨烯结构的面内有序性调节。球磨后,有缺陷的涡轮层FG转化为缺陷丰富的裂纹FG(CFG),其有序范围缩短,层间间距增大。CFG负极在比容量和速率性能方面优于FG、商用炭黑和石墨电极,这是由于打开的通道和缩短的Li+传输路径。此外,它显示出优异的循环稳定性,在第500次循环时保持99%的高容量。还有,它与LiFePO4正极配合良好,能够在2C和4C时分别以77%和62%的充电状态对LIB全电池进行快速充电。这项关于石墨烯生产和结构工程的研究为快速充电锂离子电池的商业潜力提供了实际应用。

原文下载:

16765062937c60f5.pdf


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Graphene has yet to be mass produced, so practical fast-charging lithium-ion battery (LIB) prototypes based on graphene are scarce. Graphene suffers from long in-plane and reluctant in-depth lithium diffusion due to its defect-free atomic arrangement, resulting in unsatisfactory rate performance as LIB anodes. In this work, combinatorial flash joule heating and ball milling treatment are implemented to enable gram-scale production of graphene in seconds (known as flash graphene, FG) and in-plane ordered-range modulation of graphene architectures. Following the ball milling, the defect-deficient turbostratic FG is transformed to defect-rich cracked FG (CFG), which has shortened ordered ranges and larger interlayer spacings. The CFG anode outperforms FG, commercial carbon black, and graphite electrodes in terms of specific capacity and rate performance due to open channels and shortened pathways for Li+ transport. Moreover, it shows outstanding cycling stability with a high capacity retention of 99% at the 500th cycle. Furthermore, it works well with the LiFePO4 cathode, enabling fast-charging LIB full battery with a state of charge of 77 and 62% at 2C and 4C, respectively. This research on graphene production and structural engineering provides a practical application for the commercial potential of fast-charging LIBs.






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