A Two‐dimensional Metal‐Organic Framework as Promising Cathode for Advanced Lithium Storage

• Published in: Chemistry : a European journal 2024-03, Vol.30 (13), p.e202303683-n/a
• Main Authors: Zhou, Anna, Zheng, Junyang, Lei, Chengxi, Liang, Jiaying, Deng, Xiaotong, Wu, Zetao, Chuangchanh, Phaivanh, Chen, Qing, Zeng, Ronghua
• Format: Article
• Language: English
• Subjects: Anthraquinone; Anthraquinones; Cathodes; charge and discharge performance; Coordination polymers; Current density; Dissolution; Electrochemical analysis; Electrochemistry; Electrode materials; Electrodes; Electrolytes; Lithium; Lithium-ion batteries; metal organic framework; Metal-organic frameworks; Nonaqueous electrolytes; Polymers; Specific capacity; Structural stability
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.202303683

Anthraquinone electrode materials are promising candidates for lithium‐ion batteries (LIBs) due to the abundance of anthraquinone and the high theoretical capacity, and good reversibility of the anthraquinone electrodes. However, the active anthraquinone materials are soluble in organic electrolytes, resulting in a sharp decay of capacity during the charge and discharge processes. Herein, we report on a two‐dimensional calcium anthraquinone 2,3‐dicarboxy metal‐organic framework (2D CaAQDC MOF) fabricated using a simple hydrothermal method. The 2D CaAQDC MOF not only effectively inhibits the dissolution of active electrode substances into the electrolyte, but also promotes the diffusion of lithium ion into the pores of the MOF. When used as a cathode for the LIBs, the resulting CaAQDC electrode delivers a high specific capacity of ~100 mAh g−1 at a current density of 50 mA g−1 after 200 cycles, demonstrating its good cycle stability. Even at a high current density of 200 mA g−1, the CaAQDC electrode exhibits a specific capacity of ~60 mAh g−1. The fabricated 2D coordination polymers effectively restrains the dissolution of anthraquinone into the organic electrolyte and enhances the structural stability, which greatly improves the electrochemical performance of anthraquinone. These research results offer a rational molecular design strategy to address the dissolution of this and other active organic electrode materials. A two‐dimensional calcium anthraquinone 2,3‐dicarboxy metal‐organic framework (2D CaAQDC MOFs) was synthesized through a simple hydrothermal method, which is firstly used in lithium‐ion batteries and exhibits well cyclic stability. The synthesis of 2D MOFs can well inhibit the dissolution of anthraquinone electrode in the organic electrolyte.