Concentrated electrolyte solutions are gaining attention for their improved oxidative stability and increased availability of lithium ions, particularly lithium bis(fluorosulfonyl)imide (LiFSI) salts, though these are costly and have limitations with high-potential cathodes.
The study introduces a locally concentrated electrolyte made from 2 M LiPF dissolved in a mix of ethylene carbonate and diethyl carbonate, showing extended cycling stability and exceptional performance with nearly 98% efficiency over extended periods.
The success of this new electrolyte is largely due to fluoroethylene carbonate (FEC), which enhances ionic conductivity and helps create a stable interface, outperforming traditional carbonate-based electrolytes in lithium-metal battery applications.