Synthesis of Hexaazatriphenylene Charge-Transfer Complexes and Their Application in Cathode Active Materials for Lithium-Ion Batteries
Synthesis of Hexaazatriphenylene Charge-Transfer Complexes and Their Application in Cathode Active Materials for Lithium-Ion Batteries
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六氮杂苯并菲电荷转移配合物的合成及其在锂离子电池正极活性材料中的应用
DOI：
10.1021/acs.cgd.1c00793
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Tanaka Daisuke
中科院分区：
文献类型：
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作者：
Nakao Keisuke;Kamakura Yoshinobu;Fujiwara Makoto;Shimizu Takeshi;Yoshida Yukihiro;Kitagawa Hiroshi;Yoshikawa Hirofumi;Kitagawa Yasutaka;Tanaka Daisuke
构建具有锂离子扩散路径的填充结构的合理策略是开发有机阴极活性材料的关键要求。在这方面，具有柱状结构的电荷转移（CT）复合物是有前景的材料，因为柱之间的空隙可以充当锂离子的扩散路径。在这项研究中，通过利用电子受体，即2，3，6，7，10，11-六氰基-1，4，5，8，9，12-六氮杂苯并菲（HAT-CN）和各种电子供体（即，晕苯、芘、蒽和咔唑）。这些配合物的结构通过单晶X-射线衍射测量确定，并评估它们作为锂离子电池阴极活性材料的适用性。由HAT-CN和晕苯组成的CT复合物（CT-2）表现出较高的容量（在100 mA g-1的电流密度下，第一次循环的容量为163.6 mAh g-1），这归因于强的芳香相互作用产生稳定的柱状结构。
A rational strategy for constructing a packing structure with diffusion paths for lithium ions is a critical requirement in the development of organic cathode active materials. Charge-transfer (CT) complexes with columnar structures are prospective materials in this regard because the voids between the columns can serve as diffusion paths for lithium ions. In this study, four CT complexes with columnar structures were synthesized by utilizing the π–π interactions between an electron acceptor, namely, 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN), and various electron donors (i.e., coronene, pyrene, anthracene, and carbazole). The structures of these complexes were determined by single-crystal X-ray diffraction measurements, and their suitability for use as cathode-active materials in lithium-ion batteries was evaluated. The CT complex composed of HAT-CN and coronene (CT-2) showed a high capacity (163.6 mAh g–1at a current density of 100 mA g–1in the first cycle), which was attributed to the strong aromatic interactions producing a stable columnar structure.