首页|Triple-function eutectic solvent additive for high performance lithium metal batteries

Triple-function eutectic solvent additive for high performance lithium metal batteries

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Rational carbonate electrolyte chemistry is critical for the development of high-voltage lithium metal batteries(LMBs).However,the implementation of traditional carbonate electrolyte is greatly hindered by the generation of an unstable electrode interphase and corrosive by-product(HF).Herein,we propose a triple-function eutectic solvent additive of N-methylacetamide(NmAc)with LiNO3 to enhance the sta-bility and compatibility of carbonate electrolyte.Firstly,the addition of NmAc significantly improves the solubility of LiNO3 in carbonate electrolyte by forming an eutectic pair,which regulates the Li+solvation structure and leads to dense and homogenous Li plating.Secondly,the hydrolysis of acidic PF5 is effec-tively alleviated due to the strong complexation of NmAc with PF5,thus reducing the generation of cor-rosive HF.In addition,the optimized cathode electrolyte interphase layer decreases the structural degradation and transition metal dissolution.Consequently,Li‖LiNi0.6Co0.2Mn0.2O2(NCM622)cells with the designed electrolyte deliver superior long-term cycle reversibility and excellent rate capability.This study unveils the rationale for incorporating eutectic solvent additives within carbonate electrolytes,which significantly contribute to the advancement of their practical application for high-voltage LMBs.

Eutectic solvent additiveSolvation structureInterfacial chemistryPF5 capturerLithium metal battery

Wenqiang Fang、Zuxin Wen、Fenglin Wang、Long Chen、Ying Zhang、Ning Zhang、Xiaohe Liu、Gen Chen

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School of Materials Science and Engineering,Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province,Central South University,Changsha 410083,China

Zhongyuan Critical Metals Laboratory,School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China

National Natural Science Foundation of ChinaNatural Science Foundation for Distinguished Young Scholars of Hunan ProvinceCentral South University Innovation-Driven Research ProgramHigh-Performance Computing Center of Central South University

223791662022JJ100892023CXQD034

2024

10.1016/j.scib.2024.02.009

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(11)
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