Affiliation:
1. State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Polymer Science and Engineering Zhejiang University Hangzhou 310058 China
2. State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering Zhejiang University Hangzhou 310058 China
Abstract
AbstractThe growth of disorganized lithium dendrites and weak solid electrolyte interphase greatly impede the practical application of lithium metal batteries. Herein, we designed and synthesized a new kind of stable polyimide covalent organic frameworks (COFs), which have a high density of well‐aligned lithiophilic quinoxaline and phthalimide units anchored within the uniform one‐dimensional channels. The COFs can serve as an artificial solid electrolyte interphase on lithium metal anode, effectively guiding the uniform deposition of lithium ions and inhibiting the growth of lithium dendrites. The unsymmetrical Li||COF−Cu battery exhibits a Coulombic efficiency of 99 % at a current density of 0.5 mA cm−2, which can be well retained up to 400 cycles. Meanwhile, the Li‐COF||LFP full cell shows a Coulombic efficiency over 99 % at a charge of 0.3 C. And its capacity can be well maintained up to 91 % even after 150 cycles. Therefore, the significant electrochemical cycling stability illustrates the feasibility of employing COFs in solving the disordered deposition of lithium ions in lithium metal batteries.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
General Chemistry,Catalysis