April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)

Event Supporters

2024 MRS Spring Meeting
ES04.09.01

Anthraquinone-Based Silicate Covalent Organic Frameworks as Solid Electrolyte Interphase for High-Performance Lithium-Metal Batteries

When and Where

Apr 26, 2024
1:30pm - 1:45pm
Room 422, Level 4, Summit

Presenter(s)

Co-Author(s)

Chen Li1

The Hong Kong University of Science and Technology1

Abstract

Chen Li1

The Hong Kong University of Science and Technology1
Lithium (Li)-metal batteries (LMBs) possess the highest theoretical energy density among current battery designs and thus have enormous potential for use in energy storage. However, the development of LMBs is severely hindered by safety concerns arising from dendrite growth and unstable interphases on the Li anode. Covalent organic frameworks (COFs) incorporating either redox-active or anionic moieties on their backbones have high Li-ion (Li<sup>+</sup>) conductivities and mechanical/chemical stabilities, so are promising for solid-electrolyte interphases (SEI) in LMBs. Here, we synthesized anthraquinone-based silicate COFs (AQ-Si-COFs) that contained both redox-active and anionic sites via condensation of tetrahydroxy-anthraquinone with silicon dioxide. The nine Li<sup>+</sup> mediated charge/discharge processes enabled the AQ-Si-COF to demonstrate an ionic conductivity of 9.8 mS cm<sup>−1</sup> at room temperature and a single-ion-conductive transference number of 0.92. Computational studies also supported the nine Li<sup>+</sup> mechanism. We used AQ-Si-COF as the solid electrolyte interphase on the Li anode. The LMB cells with LiCoO<sub>2</sub> cathode attained a maximum reversible capacity of 188 mAh g<sup>−1</sup> at 0.25 C during high-voltage operation. Moreover, this LMB cell demonstrated suppressed dendrite growth and stable cyclability, with its capacity decreasing by less than 3% up to 100 cycles. These findings demonstrate the effectiveness of our redox-active and anionic COFs and their practical utility as SEI in LMB.

Keywords

2D materials | chemical synthesis

Symposium Organizers

Betar Gallant, Massachusetts Institute of Technology
Tao Gao, University of Utah
Yuzhang Li, University of California, Los Angeles
Wu Xu, Pacific Northwest National Laboratory

Session Chairs

Tao Gao
Wu Xu

In this Session