Fluorinated Electrolytes for High-Energy Ni-rich NCA90 Lithium-Ion Batteries at a Cylindrical Cell Configuration: A Deep Dive into Decomposition Pathways.

This study investigates the electrochemical performance, stability, and decomposition mechanisms of fluorine-based electrolytes in large-scale cylindrical Ni-rich lithium-ion batteries (LIBs) under high-voltage conditions (up to 4.8 V). We examine fluoroethylene carbonate (FEC) and di-fluoroethylene carbonate (DFEC) in electrolyte formulations and their effects on battery longevity, gas evolution, and solvation dynamics.

Preconcentration of lithium salt in nanoporous alumina on Cu foil as a concentrated lithium semi-solid layer for anode-free Li-metal batteries.

We preconcentrate 2 M LiTFSI in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide inside a nanoporous alumina (AlO) layer as a so-called concentrated lithium semi-solid layer on a Cu current collector for anode-free Li-metal NMC90 batteries. This concept lowers the activation energy for lithium-ion transport and reduces the nucleation overpotential, enhancing the cycling stability.