High‐Energy‐Density Li‐CO<sub>2</sub> Battery at Elevated Temperatures: Advances with Fluorine‐Substituted Graphdiyne and Ionic Liquid
Junxiang Zhang, Ding Ding, Qisheng Fang, Jianli Cheng, Heyu Xiao, Bin Wang
Abstract
Abstract Li‐CO 2 batteries demonstrate promising prospects in terms of high‐density energy storage and efficient CO 2 fixation. However, their practical application is impeded by sluggish reaction kinetics and leakage of volatile and flammable organic electrolytes, especially for high temperature application scenarios, leading to large polarization and limited cycling stability. Herein, we fabricate a highly rechargeable and stable Li‐CO 2 battery with high temperature adaptability by employing fluorine‐substituted graphdiyne (FGDY) as cathode catalysts and imidazolium‐based ionic liquid as electrolyte solvents. The employed FGDY, which possesses homogeneous sp‐hybridized carbon, high specific surface area, and uniform pores, significantly enhances the battery reaction kinetics. Consequently, the fabricated Li‐CO 2 batteries operate consistently at a large current density of 5.0 A⋅g −1 at 80 °C while showcasing high discharge capacity of 29050 mAh⋅g −1 along with excellent cycling stability. As proof of concept, Li‐CO 2 pouch cells achieve a high energy density of 536 Wh⋅kg −1 based on the total mass of the device, and show outstanding cycling stability at 80 °C. This study underscores the effectiveness of graphdiyne‐derived carbon catalysts in achieving high‐performance Li‐CO 2 batteries.