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Title: A bifunctional electrolyte additive for separator wetting and dendrite suppression in lithium metal batteries

Abstract

Reformulation of electrolyte systems and improvement of separator wettability are vital to electrochemical performances of rechargeable lithium (Li) metal batteries, especially for suppressing Li dendrites. In this work we report a bifunctional electrolyte additive that improves separator wettability and suppresses Li dendrite growth in LMBs. A triblock polyether (Pluronic P123) was introduced as an additive into a commonly used carbonate-based electrolyte. It was found that addition of 0.2~1% (by weight) P123 into the electrolyte could effectively enhance the wettability of polyethylene separator. More importantly, the adsorption of P123 on Li metal surface can act as an artificial solid electrolyte interphase layer and contribute to suppress the growth of Li dendrites. A smooth and dendritic-free morphology can be achieved in the electrolyte with 0.2% P123. The Li||Li symmetric cells with the 0.2% P123 containing electrolyte exhibit a relatively stable cycling stability at high current densities of 1.0 and 3.0 mA cm-2.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1427922
Report Number(s):
PNNL-SA-120744
Journal ID: ISSN 0013-4686; VT1201000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Electrochimica Acta; Journal Volume: 270; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
lithium dendrite suppression; bifunctional additive; polyether; Pluronic P123

Citation Formats

Zheng, Hao, Xie, Yong, Xiang, Hongfa, Shi, Pengcheng, Liang, Xin, and Xu, Wu. A bifunctional electrolyte additive for separator wetting and dendrite suppression in lithium metal batteries. United States: N. p., 2018. Web. doi:10.1016/j.electacta.2018.03.089.
Zheng, Hao, Xie, Yong, Xiang, Hongfa, Shi, Pengcheng, Liang, Xin, & Xu, Wu. A bifunctional electrolyte additive for separator wetting and dendrite suppression in lithium metal batteries. United States. doi:10.1016/j.electacta.2018.03.089.
Zheng, Hao, Xie, Yong, Xiang, Hongfa, Shi, Pengcheng, Liang, Xin, and Xu, Wu. Sun . "A bifunctional electrolyte additive for separator wetting and dendrite suppression in lithium metal batteries". United States. doi:10.1016/j.electacta.2018.03.089.
@article{osti_1427922,
title = {A bifunctional electrolyte additive for separator wetting and dendrite suppression in lithium metal batteries},
author = {Zheng, Hao and Xie, Yong and Xiang, Hongfa and Shi, Pengcheng and Liang, Xin and Xu, Wu},
abstractNote = {Reformulation of electrolyte systems and improvement of separator wettability are vital to electrochemical performances of rechargeable lithium (Li) metal batteries, especially for suppressing Li dendrites. In this work we report a bifunctional electrolyte additive that improves separator wettability and suppresses Li dendrite growth in LMBs. A triblock polyether (Pluronic P123) was introduced as an additive into a commonly used carbonate-based electrolyte. It was found that addition of 0.2~1% (by weight) P123 into the electrolyte could effectively enhance the wettability of polyethylene separator. More importantly, the adsorption of P123 on Li metal surface can act as an artificial solid electrolyte interphase layer and contribute to suppress the growth of Li dendrites. A smooth and dendritic-free morphology can be achieved in the electrolyte with 0.2% P123. The Li||Li symmetric cells with the 0.2% P123 containing electrolyte exhibit a relatively stable cycling stability at high current densities of 1.0 and 3.0 mA cm-2.},
doi = {10.1016/j.electacta.2018.03.089},
journal = {Electrochimica Acta},
number = C,
volume = 270,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2018},
month = {Sun Apr 01 00:00:00 EDT 2018}
}