Acetylation Strategy for Unzipping Carbon Nanotubes in High-Performance Lithium-Ion Batteries
Acetylation Strategy for Unzipping Carbon Nanotubes in High-Performance Lithium-Ion Batteries
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高性能锂离子电池中碳纳米管的乙酰化策略
DOI：
10.1021/acsanm.2c04552
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发表时间：
2022-12
影响因子：
5.9
通讯作者：
You-Nian Liu
中科院分区：
文献类型：
--
作者：
Tianxing Xu;Qiaoling Yang;Xueliang Zhang;Yin Lin;Jue Wang（通讯作者）;Yajuan Li;You-Nian Liu
尽管碳纳米管（CNTs）作为锂离子电池（LIB）负极材料以其优异的电化学性能和机械性能受到了极大的关注，但其较低的理论比容量严重限制了其实际应用。可以在LIB中引入高比容量的有机羰基化合物以增加CNT的比容量。然而，有机羰基化合物的固有电绝缘性质和活性位点的低利用率以及在非质子电解质中的高溶解度是严重的问题。在此，我们报告了一种在未压缩的碳纳米管（UCNTs）上结合有机乙酰基的策略来解决上述问题，该策略不仅解决了有机小分子的导电性差和快速溶解的问题，而且还提高了碳纳米管的比容量。乙酰化碳纳米管（AcUCNTs）在LIB中表现出优异的电化学性能，在200 mA g-1下首次充放电容量分别达到987.1和875.2 mA h g-1。更令人印象深刻的是，AcUCNTs保留了540.0 mA h g-1的高容量后，87个周期，这是显着高于原始的碳纳米管。该研究为有机和无机材料的结合提供了一种技术，以获得上级电极材料，这对LIB的发展具有重要意义。
Although carbon nanotubes (CNTs) have attracted tremendous attention as the lithium-ion battery (LIB) anode material considering their excellent electrochemical and mechanical properties, their low theoretical specific capacity severely limits the practical applications. The high specific capacities of organic carbonyl compounds in LIBs can be introduced to increase the specific capacity of CNTs. However, the inherent electrical insulating properties and low utilization of active sites of organic carbonyl compounds, as well as a high solubility in aprotic electrolytes, are severe concerns. Herein, we report a strategy of combining organic acetyl groups on unzipped CNTs (UCNTs) to address above issues, which not only tackles the poor conductivity and rapid dissolution of small organic molecules but also improves the specific capacity of CNTs. Acetylated UCNTs (AcUCNTs) display an admirable electrochemical performance in LIBs, with the first cycle discharge and charge capacities reaching 987.1 and 875.2 mA h g–1at 200 mA g–1, respectively. More impressively, AcUCNTs retains a high capacity of 540.0 mA h g–1after 87 cycles, which is dramatically higher than that of pristine CNTs. This research is important for providing a technology for combining organic and inorganic materials to achieve superior electrode materials, which is significant in the development of LIBs.
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碳纳米管在学术研究与锂电池商业化之间的关键作用
DOI：
10.1002/tcr.202200125
发表时间：
2022-07
期刊：
The Chemical Record
影响因子：
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作者：
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通讯作者：
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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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