A salt, lithium difluoro (oxalato)borate, was reported as a promising salt for advanced and stable electrolyte that can improve the life of lithium-ion batteries. The unique feature of lithium difluoro (oxalato)borate is that it gives very low interfacial impedance for lithium-ion cells as in the case of -based electrolyte.
Herein, we present the utilization of lithium difluoro (oxalate) borate (B) (LiDFOB), a B-containing lithium salt, as a functional additive for Li||LiNi 0.85 Co 0.1 Mn 0.05 O 2 (NCM85) batteries, and comprehensively investigate its mechanism of action towards enhancing the stability of both anode and cathode interfaces.
The pursuit of a stable and dense SEI film to enhance the electrochemical performance of LIBs has been a focal point in this field. In this paper, the additive of lithium difluoro (oxalate)borate (LiODFB) is used into the electrolyte to optimize the SEI film for Li || graphite half-cell and LiFePO 4 (LFP) || graphite full-cell.
Lithium difluoro (oxalato)borate is reported as a salt for high-performance lithium-ion batteries with improved cycle life and power capability. The experimental results showed that lithium difluoro (oxalato)borate, , can be reduced at about vs and forms a robust protective SEI film on the graphite surface, as lithium bis (oxalato)borate does.
The lithium-ion cells using lithium difluoro (oxalato)borate-based electrolyte had very good capacity retention at 55°C. The lithium-ion cells using the lithium difluoro (oxalato)borate-based electrolyte had very low interfacial impedance.
In addition to FEC, there are several other fluorinated electrolyte additives with positive effects on battery cycling.