Enhancing Cycling Stability of Lithium Metal Batteries by a Bifunctional Fluorinated Ether

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2024-07-03 DOI:10.1002/adfm.202407012

Thanh‐Nhan Tran, Xia Cao, Yaobin Xu, Peiyuan Gao, Hui Zhou, Fenghua Guo, Kee Sung Han, Dianying Liu, Phung ML Le, J. Mark Weller, Mark H. Engelhard, Chongmin Wang, M. Stanley Whittingham, Wu Xu, Ji‐Guang Zhang

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Abstract

The lifespan of lithium (Li) metal batteries (LMBs) can be greatly improved by the formation of inorganic‐rich electrode‐electrolyte interphases (EEIs) (including solid‐electrolyte interphase on anode and cathode‐electrolyte interphase on cathode). In this work, a localized high‐concentration electrolyte containing lithium bis(fluorosulfonyl)imide (LiFSI) salt, 1,2‐dimethoxyethane (DME) solvent and 1,2‐bis(1,1,2,2‐tetrafluoroethoxy)ethane (BTFEE) diluent is optimized. BTFEE is a fluorinated ether with weakly‐solvating ability for LiFSI so it also acts as a co‐solvent in this electrolyte. It can facilitate anion decomposition at electrode surfaces and promote the formation of more inorganic‐rich EEI layers. With an optimized molar ratio of LiFSI:DME:BTFEE = 1:1.15:3, LMBs with a high loading (4 mAh cm−2) lithium nickel manganese cobalt oxide (LiNi0.8 Mn0.1 Co0.1) cathode can retain 80% capacity in 470 cycles when cycled in a voltage range of 2.8–4.4 V. The fundamental understanding on the functionality of BTFEE revealed in this work provides new perspectives on the design of practical high‐energy density battery systems.

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双官能氟化醚增强金属锂电池的循环稳定性

通过形成富含无机物的电极-电解质相（EEIs）（包括阳极上的固体-电解质相和阴极上的阴极-电解质相），可以大大提高锂（Li）金属电池（LMB）的寿命。这项研究优化了一种局部高浓度电解质，其中包含双（氟磺酰）亚胺锂盐、1,2-二甲氧基乙烷（DME）溶剂和 1,2-双（1,1,2,2-四氟乙氧基）乙烷（BTFEE）稀释剂。BTFEE 是一种氟化醚，对 LiFSI 具有弱溶解能力，因此也可作为该电解质的助溶剂。它可以促进阴离子在电极表面的分解，并促进形成更多富含无机物的 EEI 层。通过优化 LiFSI:DME:BTFEE = 1:1.15:3 的摩尔比，采用高负载（4 mAh cm-2）锂镍锰钴氧化物（LiNi0.8 Mn0.1 Co0.1）阴极的 LMB 在 2.8-4.4 V 的电压范围内循环 470 次后仍能保持 80% 的容量。这项研究揭示了对 BTFEE 功能的基本认识，为设计实用的高能量密度电池系统提供了新的视角。

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来源期刊

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.

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