材料科学
环丁烷
锂(药物)
密度泛函理论
分子
碳纳米管
阴极
分子间力
溶解度
纳米技术
化学工程
化学物理
计算化学
物理化学
有机化学
化学
戒指(化学)
内分泌学
工程类
医学
作者
Yan Zu,Ye Xu,Lijiao Ma,Qian Kang,Jingwen Wang,Huifeng Yao,Jianhui Hou,Yan Zu,Ye Xu,Lijiao Ma,Qian Kang,J. Wang,Huifeng Yao,Jianhui Hou
标识
DOI:10.1016/j.ensm.2021.06.012
摘要
Although organic redox molecules as electrode materials can achieve a high specific capacity through molecular design engineering, effective strategies to overcome their low cycling stability have not yet been developed. Herein, we establish a novel strategy that utilizes a strong dipole effect to suppress the high solubility of organic molecules and, thus, improve cycling stability. Two organic single crystals of squaraine derivative molecules with different substituents, 2,4-di(piperidin-1-yl)cyclobutane-1,3-dione (SAPD) and 2,4-di(pyrrolidin-1-yl)cyclobutane-1,3-dione (SAPL), were synthesized by facile routes. In particular, the SAPL cathode exhibited a discharge capacity of 371 mA h g–1 at 48 mA g–1 (0.1 C) and a nearly 78% capacity retention after 1000 cycles at 0.24 A g–1 (0.5 C). It also exhibited a capacity of 135 mA h g–1 even at 4.8 A g–1 (10 C) without hybridizing with graphene or carbon nanotubes. We studied the molecular interactions of SAPD and SAPL via detailed density functional theory calculations and revealed their lithium-ion storage mechanisms by using ex-situ technologies. Through comparing their intermolecular interactions, we found the stronger dipole effect can elevate cycling performance better. Hence, our design strategy can serve as a promising path for constructing high-performance lithium-organic batteries with long-term cycling stability.
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