Organocatalytic Lithium Chloride Oxidation by Covalent Organic Frameworks for Rechargeable Lithium‐Chlorine Batteries
Yan Xu, Mingming Wang, Muhammad Sajid, Yahan Meng, Zehui Xie, Lidong Sun, Jian Jin, Wei Chen, Shenxiang Zhang
Abstract
Abstract Rechargeable Li−Cl 2 battery is a promising high energy density battery system. However, reasonable cycle life could only be achieved under low specific capacities due to the sluggish oxidation of LiCl to Cl 2 . Herein, we propose an amine‐functionalized covalent organic framework (COF) with catalytic activity, namely COF−NH 2 , that significantly decreases the oxidation barrier of LiCl and accelerates the oxidation kinetics of LiCl in Li−Cl 2 cell. The resulting Li−Cl 2 cell using COF−NH 2 (Li−Cl 2 @COF−NH 2 ) simultaneously exhibits low overpotential, ultrahigh discharge capacity up to 3500 mAh/g and a promoted utilization ratio of deposited LiCl at the first cycle (UR−LiCl) of 81.4 %, which is one of the highest reported values to date. Furthermore, the Li−Cl 2 @COF−NH 2 cell could be stably cycled for over 200 cycles when operating at a capacity of 2000 mAh/g at −20 °C with a Coulombic efficiency (CE) of ≈100 % and a discharge plateau of 3.5 V. Our superior Li−Cl 2 batteries enabled by organocatalyst enlighten an arena towards high‐energy storage applications.