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Novel Lamellar Tetrapotassium Pyromellitic Organic for Robust High‐Capacity Potassium Storage
Author(s) -
Pan Qingguang,
Zheng Yongping,
Tong Zhaopeng,
Shi Lei,
Tang Yongbing
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202103052
Subject(s) - lamellar structure , ion , pyromellitic dianhydride , chemistry , rational design , redox , chemical engineering , conjugated system , materials science , inorganic chemistry , nanotechnology , polymer , organic chemistry , crystallography , polyimide , layer (electronics) , engineering
Redox‐active organics are investigation hotspots for metal ion storage due to their structural diversity and redox reversibility. However, they are plagued by limited storage capacity, sluggish ion diffusion kinetics, and weak structural stability, especially for K + ion storage. Herein, we firstly reported the lamellar tetrapotassium pyromellitic (K 4 PM) with four active sites and large interlayer distance for K + ion storage based on a design strategy, where organics are constructed with the small molecular mass, multiple active sites, fast ion diffusion channels, and rigid conjugated π bonds. The K 4 PM electrode delivers a high capacity up to 292 mAh g −1 at 50 mA g −1 , among the best reported organics for K + ion storage. Especially, it achieves an excellent rate capacity and long‐term cycling stability with a capacity retention of ≈83 % after 1000 cycles. Incorporating in situ and ex‐situ techniques, the K + ion storage mechanism is revealed, where conjugated carboxyls are reversibly rearranged into enolates to stably store K + ions. This work sheds light on the rational design and optimization of organic electrodes for efficient metal ion storage.