A novel deep eutectic solvents as electrolyte for lithium-ion batteries and its electrochemical performance

Abstract

The carbonate-based organic electrolytes suffer from issues like flammability and degradation over extended cycling, which hinder the development of lithium-ion batteries. In this study, a lithium bis(trifluoromethanesulfonyl)imide–N,N′-dimethylpropionamide(LiTFSI-DMPA) deep eutectic solvent(DES) was developed and applied as an electrolyte for lithium-ion batteries. The results indicate that the interaction between LiTFSI and DMPA enhances Li⁺ transport, while the synergistic effects of multiple functional groups in DMPA and LiTFSI endow the electrolyte with good thermal stability. The assembled Li|LFP half-cell retained over 86.1 % of its capacity after 400 cycles at 1C, and exhibited superior rate performance compared to conventional carbonate-based organic electrolytes.