High‐efficiency Lithium Metal Stabilization and Polysulfide Suppression in Li‐S Battery Enabled by Weakly Solvating Solvent

Author:

Pham Thuy Duong1ORCID,Bin Faheem Abdullah2,Kim Junam2,Ma Seung‐Hyeok2,Kwak Kyungwon3,Lee Kyung‐Koo2ORCID

Affiliation:

1. Faculty of Biotechnology Chemistry and Environmental Engineering Phenikaa University Hanoi 10000 Vietnam

2. Department of Chemistry Kunsan National University Gunsan Jeonbuk 54150 Republic of Korea

3. Department of Chemistry Korea University Seoul 02841 Republic of Korea

Abstract

AbstractLithium‐sulfur batteries (LSBs) are considered a highly promising next‐generation energy storage technology due to their exceptional energy density and cost‐effectiveness. However, the practical use of current LSBs is hindered primarily by issues related to the “shuttle effect” of lithium polysulfide (LiPS) intermediates and the growth of lithium dendrites. In strongly solvating electrolytes, the solvent‐derived solid electrolyte interphase (SEI) lacks mechanical strength due to organic components, leading to ineffective lithium dendrite suppression and severe LiPS dissolution and shuttling. In contrast, the weakly solvating electrolyte (WSE) can create an anion‐derived SEI layer which can enhance compatibility with lithium metal anode, and restricting LiPS solubility. Herein, a WSE consisting of 0.4 м LiTFSI in the mixture of 1,4‐dioxane (DX):dimethoxymethane (DMM) is designed to overcome the issues associated with LSB. Surface analyses confirmed the formation of a beneficial SEI layer rich in LiF, enabling homogeneous lithium deposition with an average Coulombic efficiency CE exceeding 99% over 100 cycles. Implementing the low‐concentration WSE in Li||SPAN cells yielded an impressive initial specific capacity of 671 mAh g−1. This research highlights the advantages of WSE and offers the pathway for cost‐effective electrolyte development, enabling the realization of high‐performance LSBs.

Funder

National Research Foundation of Korea

Publisher

Wiley

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