Introducing NO3– into Carbonate‐Based Electrolytes via Covalent Organic Framework to Incubate Stable Interface for Li‐Metal Batteries. (19th December 2021)

• Record Type: Journal Article
• Authors: Wen, Yucheng; Ding, Jieying; Yang, Yan; Lan, Xuexia; Liu, Jun; Hu, Renzong; Zhu, Min
• Is Part Of: Advanced functional materials. Volume 32:Number 15(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-19
• Subjects: covalent organic framework -- high voltage cathode -- Li metal anode -- lithium nitrate; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202109377
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Lithium nitrate (LiNO3 ) as an effective additive to construct stable solid electrolyte interface (SEI) is generally applied in ether‐based electrolytes, but its poor solubility in carbonate‐based electrolytes limits further application for Li metal batteries (LMBs). Therefore, an engineering of introducing NO3 – into carbonate‐based electrolytes by synthesizing targeted covalent organic framework (EB‐COF:NO3 ) to modify Li anode for incubating a reliable SEI is reported. Its unique structure not only facilitates the desolvation process of lithium ions (Li + ) to accelerate the transport of Li +, but also releases NO3 – to form beneficial Li3 N, LiN x O y species to in situ construct a stable SEI. With the application of EB‐COF:NO3, the cycling and rate performance of (50 µm) Li//LiFePO4 full cell is comprehensively improved under the conditions of poor electrolyte and high loading, significantly increasing capacity retention from 14% to 94% after 200 cycles. And the high voltage Li//LiNi0.5 Mn1.5 O4 full cell still demonstrates excellent cycling stability with the capacity retention of 92% after 600 cycles. Accordingly, this strategy shares a prospect for the application of covalent organic frameworks (COFs) to build a stable SEI for high‐energy‐density LMBs, and also broadens the application of LiNO3 in carbonate‐based electrolytes. Abstract : The functional covalent organic framework (EB‐COF:NO3 ) is conducive to the process of desolvation for accelerating Li + transport. And, the released NO3 − generates stable solid electrolyte interface (SEI) for protecting Li anode in carbonate‐based electrolytes. Therefore, the much better performances of Li//LiFePO4 full cell with high loading and Li//LiNi0.5 Mn1.5 O4 full cell with high voltage are harvested.