Self‐Activation Enables Cationic and Anionic Co‐Storage in Organic Frameworks. Issue 3 (21st December 2021)

• Record Type: Journal Article
• Authors: Cheng, Zhangyuan; Le, Jiabo; Wang, Jun; Sun, Wenlu; Zheng, Lei; Cai, Lifeng; Lu, Derong; Shen, Yanbin; Wu, Jihuai; Fu, Fang; Chen, Hongwei
• Is Part Of: Advanced energy materials. Volume 12:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-21
• Subjects: anionic batteries -- frameworks -- multi‐ion storage -- organic electrodes -- self‐activation; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202101930
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: The low capacity of current anion‐hosting electrodes makes it challenging to meet future energy requirements. Maintaining the high capacity of ions per unit volume and/or weight is always the ultimate goal for an optimal electrode design. Here, an organic framework is reported that can efficiently co‐store anions and cations in a single discharge/charge process, accompanied with a special cation‐assisted electrode activation process. The inserted cations not only facilitate anion diffusion kinetics, but also make a considerable contribution to the total capacity of the electrodes. This anion–cation co‐storage cathode thus can deliver a high capacity of 530 mAh g −1 at 3.4–1.0 V and a high energy density of 901 Wh kg −1 after 800 cycles (at 0.15 A g −1 ). The understanding of the self‐activation process is expected to inspire electrode design that utilizes anionic–cationic hybrid electrode chemistries beyond current Li‐ion batteries. Abstract : A covalent organic polymer (COP) cathode based on anion/cation co‐storage exhibits a unique self‐activation process. The COP/Li cell delivers a high energy density of 901 Wh kg −1 (at 0.15 A g −1 (1 C)).