From spent graphite to recycle graphite anode for high-performance lithium ion batteries and sodium ion batteries
From spent graphite to recycle graphite anode for high-performance lithium ion batteries and sodium ion batteries
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从废石墨到高性能锂离子电池和钠离子电池的回收石墨阳极
DOI：
10.1016/j.electacta.2020.136856
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发表时间：
2020-10
影响因子：
6.6
通讯作者：
Li Qingyu
中科院分区：
文献类型：
--
作者：
Liu Kui;Yang Shenglong;Luo Luqin;Pan Qichang;Zhang Peng;Huang Youguo;Zheng Fenghua;Wang Hongqiang;Li Qingyu
目前，回收废旧锂离子电池正极材料以回收高价值金属元素已受到广泛关注。然而，回收石墨材料通常被丢弃，因为低附加值和严格的分离步骤。在本研究中，我们探讨了改造后的废石墨作为锂离子电池和锂离子电池阳极材料再利用的可能性。通过结构重构过程，可以增强石墨的层间力，减小石墨的层间晶格距离，从而使重构后的石墨具有改进的、稳定的层状结构。作为锂离子电池的负极材料，重构石墨表现出优异的电化学性能。结果表明，重构石墨在0.5℃下循环200次后可提供427.9 mAh g−1的高容量，并且还显示出出色的倍率能力（在3℃下可达到114.9 mAh g−1的容量）。此外，经酸处理的石墨可以直接用作sib的阳极材料，在50 mA g - 1下具有127 mAh g - 1的高可逆容量，并且具有优异的长循环寿命（在2000 mA g - 1下循环500次后可获得106.8 mAh g - 1的高容量保持率为90.98%）。
Nowadays, recycling cathode materials form spent lithium ion batteries (LIBs) has attracted widespread attentions in order to recover highly-valuable metal elements. However, recycling graphite materials is usually discarded because of the low added value and rigorous separation steps. In this study, we investigate the possibility of reusing spent graphite as anode material for LIBs and SIBs after reconstruction process. Benefiting form the structural reconstruction process, which can enhance the interlayer force and reduce the interlayer lattice distance of graphite, lead to the reconstructed graphite with improved and stable layered structure. When used as anode materials for LIBs, the reconstructed graphite exhibits outstanding electrochemical performance. As a result, the reconstructed graphite can deliver high capacity of 427.9 mAh g−1after 200 cycles at 0.5 C, and also display a outstanding rate capability (a capacity of 114.9 mAh g−1is achieved at 3 C). Furthermore, the acid-treated graphite can be directly used as anode material for SIBs, which exhibit high reversible capacity of 127 mAh g−1at 50 mA g−1, and also exhibits excellent long cycle life (a reversible capacity of 106.8 mAh g−1is achieved after 500 cycles at 2000 mA g−1with high capacity retention of 90.98%).
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影响因子：
11.1
作者：
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影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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影响因子：
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