Abstract
Electrolyte solutions based on fluorinated solvents were studied in high-voltage Li-ion cells using lithium as the anode and Li1.2Mn0.56Co0.08Ni0.16O2 as the cathode. Excellent performance was achi...
Highlights
High-energy-density lithium-ion batteries (LIBs) have been the focus of extensive research and development efforts throughout the world
Fluorinated solvents are advantageous for LIBs, as they can induce the formation of protecting films on the electrode surfaces that lead to the passivation of the electrodes
We suggest that the presence of fluorine atoms in the solvent molecules enables the elimination of HF and the formation of double bonds by reactions of fluorinated solvent molecules with basic electrode species
Summary
High-energy-density lithium-ion batteries (LIBs) have been the focus of extensive research and development efforts throughout the world. TMSP removes the HF molecules from the electrolyte solutions, forms a protective film on the cathode surface and by that improves cells performance without side reactions at the anode’s surface.[5] We expect that as an additive to solutions containing FEC or 2FEC, the contribution of possible surface reactions of TMPS to the electrodes’ passivation should be small, since the reactions of the fluorinated solvents should dominate the electrodes’ surface chemistry. These results indicate first of all that the use of fluorinated solvents form surface films on the cathode that prevent Mn dissolution from it. Addition of TMSP to the 2FEC/DMC/F-EPE based solutions increased the capacity and cycling stability of these cells further, as clearly shown in Figure 13 (red and purple curves). The most interesting parameter that was measured was the comparative amounts of Mn on the graphite anodes,
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