Ouyang Zhipeng, Tranca Diana, Zhao Yazhen, Chen Zhenying, Fu Xiaobin, Zhu Jinhui, Zhai Guangqun, Ke Changchun, Kymakis Emmanuel, Zhuang Xiaodong
The Meso-Entropy Matter Lab, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China.
The Meso-Entropy Matter Lab, The State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):9064-9073. doi: 10.1021/acsami.1c00867. Epub 2021 Feb 14.
Among various organic cathode materials, C═O group-enriched structures have attracted wide attention worldwide. However, small organic molecules have long suffered from dissolving in electrolytes during charge-discharge cycles. π-Conjugated microporous polymers (CMPs) become one solution to address this issue. However, the synthesis strategy for CMPs with rich C═O groups and stable backbones remains a challenge. In this study, a novel CMP enriched with C═O units was synthesized through a highly efficient Diels-Alder reaction. The as-prepared CMP exhibited a fused carbon backbone and a semiconductive characteristic with a band gap of 1.4 eV. When used as an organic electrode material in LIBs, the insoluble and robust fused structure caused such CMPs to exhibit remarkable cycling stability (a 96.1% capacity retention at 0.2 A g after 200 cycles and a 94.8% capacity retention at 1 A g after 1500 cycles), superior lithium-ion diffusion coefficient (5.30 × 10 cm s), and excellent rate capability (95.8 mAh g at 1 A g). This study provided a novel synthetic method for fabricating quinone-enriched fused CMPs, which can be used as LIB cathode materials.
在各种有机阴极材料中，富含C═O基团的结构在全球范围内引起了广泛关注。然而，小分子在充放电循环过程中长期存在溶解于电解质的问题。π共轭微孔聚合物（CMPs）成为解决这一问题的一种方案。然而，合成具有丰富C═O基团和稳定骨架的CMPs的策略仍然是一个挑战。在本研究中，通过高效的狄尔斯-阿尔德反应合成了一种富含C═O单元的新型CMP。所制备的CMP具有稠合碳骨架和带隙为1.4 eV的半导体特性。当用作锂离子电池的有机电极材料时，这种不溶性且坚固的稠合结构使此类CMP表现出显著的循环稳定性（在0.2 A g下循环200次后容量保持率为96.1%，在1 A g下循环1500次后容量保持率为94.8%）、优异的锂离子扩散系数（5.30×10 cm² s⁻¹）和出色的倍率性能（在1 A g下为95.8 mAh g⁻¹）。本研究提供了一种制备富含醌的稠合CMPs的新型合成方法，其可作为锂离子电池的阴极材料。
