Distributed Li‐Ion Flux Enabled by Sulfonated Covalent Organic Frameworks for High‐Performance Lithium Metal Anodes

Autor: Diandian Han, Xiubei Yang, Kuokuo Li, Linhai Sun, Tian Hou, Lin Zhang, Yanyun Sun, Lipeng Zhai, Liwei Mi
Rok vydání: 2023
Předmět:
Zdroj: Macromolecular Rapid Communications. 44
ISSN: 1521-3927
1022-1336
DOI: 10.1002/marc.202200803
Popis: Metallic Li is considered the most promising anode material for high-energy-density batteries owing to its high theoretical capacity and low electrochemical potential. However, inhomogeneous lithium deposition and uncontrollable growth of lithium dendrites result in low lithium utilization, rapid capacity fading, and poor cycling performance. Herein, two sulfonated covalent organic frameworks (COFs) with different sulfonated group contents are synthesized as the multifunctional interlayers in lithium metal batteries. The sulfonic acid groups in the pore channels can serve as Li-anchoring sites that effectively coordinate Li ions. These periodically arranged subunits significantly guide uniform Li-ion flux distribution, guarantee smooth Li deposition, and reduce lithium dendrite formation. Consequently, these characteristics afford an excellent quasi-solid-state electrolyte with a high ionic conductivity of 1.9 × 10
Databáze: OpenAIRE
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