Hydrogen‐Bond‐Stabilized Organic Potassium‐Ion Full Cell Operating at −40°C
Abstract
Abstract Low‐temperature energy storage systems confront severe operational constraints due to sluggish ion kinetics and electrolyte solidification. While potassium‐ion batteries (PIBs) offer potential for low‐cost energy storage, the absence of viable cathode materials with adequate stability at ultra‐low temperatures remains a critical barrier. Herein, we demonstrate an organic small molecule, 1,4‐dihydrobenzo[g]quinoxaline‐2,3,5,10‐tetraone (BQXTO), in which intermolecular hydrogen bonds (HB) and robust π─π interactions synergistically enhance charge transfer and impart insolubility, thereby facilitating reaction kinetics and improving cycling stability even under low‐temperature conditions. The assembled BQXTO||HC potassium‐ion full cell achieves remarkable energy density at −40 °C (188 Wh kg −1 ) and exceptional cyclability (88.2% capacity retention over 2000 cycles). This study presents valuable insights into the structure design of organic small molecule cathodes for advanced low‐temperature PIBs.
Article Details
Authors (9)
Wei‐Sheng Zhang
State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
Xian‐He Chen
State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
Chen‐Xing Zhang
State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
Yu‐Xuan Guo
State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
Wen‐Li Hu
State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
Shi‐Lin Mei
State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
Zi Li
Sino-French Hoffmann Institute, Guangzhou Medical University
Qichun Zhang
Department of Materials Science and Engineering
Chang‐Jiang Yao
School of Mechatronical Engineering Beijing Institute of Technology Beijing China