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首页> 外文期刊>Chemistry: A European journal >Electrochemically fabricated polypyrrole-cobalt-oxygen coordination complex as high-performance lithium-storage materials
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Electrochemically fabricated polypyrrole-cobalt-oxygen coordination complex as high-performance lithium-storage materials

机译：电化学制备的聚吡咯-钴-氧配位化合物作为高性能锂存储材料

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摘要

Current lithium-ion battery (LIB) technologies are all based on inorganic electrode materials, though organic materials have been used as electrodes for years. Disadvantages such as limited thermal stability and low specific capacity hinder their applications. On the other hand, the transition metal oxides that provide high lithium-storage capacity by way of electrochemical conversion reaction suffer from poor cycling stability. Here we report a novel high-performance, organic, lithium-storage material, a polypyrrole-cobalt-oxygen (PPy-Co-O) coordination complex, with high lithium-storage capacity and excellent cycling stability. Extended X-ray absorption fine structure and Raman spectroscopy and other physical and electrochemical characterizations demonstrate that this coordination complex can be electrochemically fabricated by cycling PPy-coated Co _3O _4 between 0.0 V and 3.0 V versus Li ~+/Li. Density functional theory (DFT) calculations indicate that each cobalt atom coordinates with two nitrogen atoms within the PPy-Co coordination layer and the layers are connected with oxygen atoms between them. Coordination weakens the C-H bonds on PPy and makes the complex a novel lithium-storage material with high capacity and high cycling stability.
机译：尽管有机材料已被用作电极多年，但当前的锂离子电池（LIB）技术都基于无机电极材料。诸如热稳定性有限和低比容量之类的缺点阻碍了它们的应用。另一方面，通过电化学转化反应提供高锂存储容量的过渡金属氧化物具有差的循环稳定性。在这里，我们报告了一种新型的高性能有机锂存储材料，一种聚吡咯-钴-氧（PPy-Co-O）配合物，具有高锂存储容量和出色的循环稳定性。扩展的X射线吸收精细结构和拉曼光谱以及其他物理和电化学表征表明，该配位配合物可通过将PPy涂层的Co _3O _4与Li〜+ / Li在0.0 V和3.0 V之间循环来电化学制备。密度泛函理论（DFT）计算表明，PPy-Co配位层中每个钴原子与两个氮原子配位，且各层之间均与氧原子相连。配位作用削弱了PPy上的C-H键，并使该配合物成为具有高容量和高循环稳定性的新型锂存储材料。

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