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

Sci Bull (Beijing)

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

Published: June 2024

AI Article Synopsis

  • Rational carbonate electrolyte chemistry is essential for improving high-voltage lithium metal batteries, but traditional electrolytes face issues like unstable electrode interfaces and corrosive by-products like HF.
  • The study introduces N-methylacetamide (NmAc) with LiNO as a triple-function eutectic solvent additive, enhancing Li solubility and stabilizing the electrolyte.
  • This combination reduces harmful by-product formation and structural degradation, leading to lithium cells with enhanced cycling stability and performance.

Article Abstract

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 LiNO to enhance the stability and compatibility of carbonate electrolyte. Firstly, the addition of NmAc significantly improves the solubility of LiNO 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 PF is effectively alleviated due to the strong complexation of NmAc with PF, thus reducing the generation of corrosive HF. In addition, the optimized cathode electrolyte interphase layer decreases the structural degradation and transition metal dissolution. Consequently, Li||LiNiCoMnO (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.

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Source
http://dx.doi.org/10.1016/j.scib.2024.02.009DOI Listing

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