Fluorinated Electrolytes for Enhanced EV Battery Performance

Ether-based cosolvent electrolyte for lithium metal batteries that provides high energy density without decomposition at high voltage anodes. The electrolyte contains a lithium salt dissolved in a mixture of a fluorinated dialkoxy alkane solvent like FDMB and a dialkoxy alkane solvent like DEE. This cosolvent blend improves ionic conductivity while maintaining oxidation stability compared to using just FDMB. The stability at high voltage anodes is improved due to the lower HOMO energy level of FDMB compared to ether solvents.

Source

Non-combustible electrolyte for lithium metal batteries that has reduced flammability compared to conventional electrolytes. The electrolyte contains a unique composition of solvent, electrolyte salt, and fluoroether flame retardant. The solvent is a mixture of ether, ester, and sulfone solvents. The electrolyte salt is a combination of multiple lithium salts with different anions. The fluoroether flame retardant has a high F/H molar ratio of 23. By balancing hydrogen bonding interactions between the components, phase separation is avoided. This allows using the highly flammable fluoroether at a high molar ratio to further reduce electrolyte flammability.

Source

Lithium battery electrolyte composition and battery design to suppress thermal runaway and improve safety while maintaining battery performance. The electrolyte contains a lithium salt, organic solvent, and a polyethersulfone additive with a low critical solution temperature (LCST). This additive gels at higher temperatures, reducing ion transport and adsorbing on the electrode surface to prevent runaway. The battery also has a resistance ratio between 25°C and 60°C of 1.5-3.0, indicating increased resistance with temperature to degrade performance and prevent runaway.

Source

Electrolyte composition for lithium-ion batteries that does not contain ethylene carbonate and uses high concentrations of lithium salts. The composition contains lithium bis(fluorosulfonyl)imide as the primary lithium salt, an additional lithium salt like lithium difluoro(oxalato)borate, linear carbonate solvents like dimethyl carbonate and ethyl methyl carbonate, and additives like vinylene carbonate and fluoroethylene carbonate. The high lithium salt concentration, linear carbonate solvents, and conductive SEI improve rate performance, cycling, and cell life. The composition reduces sensitivity to moisture during manufacturing and reduces HF release during thermal runaway compared to standard electrolytes.

Source

Fluorinated electrolyte for high voltage lithium-ion batteries with improved cycle life and stability, particularly for cobalt-free nickel-manganese oxide (NMC) cathodes. The fluorinated electrolyte contains a fluoride salt electrolyte mixed with a solvent blend of fluoroethylene carbonate, trifluoroethyl methyl carbonate, and tetrafluoroethyl-tetrafluoropropyl ether. This fluorinated electrolyte provides stability and long-cycle performance for high voltage NMC batteries due to the formation of a nanoscale fluorinated interface phase.

Source

Electrolyte for lithium-ion batteries that improves storage and cycle performance at high voltages. The electrolyte contains a solvent and a fluorine-containing lithium salt. The electrolyte has an electrochemical stability coefficient of 0.18-0.6, where a lower value indicates better stability. This stability range reduces decomposition and corrosion of the electrodes at high voltages, improving battery performance.

Source

Electrolyte for lithium-ion batteries containing fluorinated additives to improve performance in high-voltage and high-silicon cathode and anode materials. The electrolyte composition includes a solvent, lithium salt, and a mixture of fluorinated additives. The additives are fluorinated compounds with specific structural formulas. The fluorinated additives prevent SEI film rupture, gas evolution, metal dissolution, and capacity fade in high-voltage cathodes and silicon anodes. They also improve capacity retention and cycling stability at high temperatures.

Source

Electrolyte for lithium-ion batteries that improves performance at high voltages and low temperatures. The electrolyte contains a fluorinated solvent, lithium salt, and additives. The fluorinated solvent allows higher voltage operation without decomposition compared to traditional solvents like ethylene carbonate. The additives include a polyfluoroether diluent that reduces viscosity and freezing point compared to traditional additives. This enables better cycling and low-temperature performance for lithium-ion batteries.

Source

Electrolyte composition for lithium-ion batteries that improves cycling performance, particularly at high temperatures, when used in batteries with high cathode voltages. The electrolyte contains a fluorinated compound like CF3COOCH3, a non-fluorinated carbonate, a lithium/boron compound, and a lithium salt. The electrolyte enables higher cycle life and lower gas generation compared to conventional electrolytes at high temperatures.

Source

Electrolyte composition for lithium-ion batteries that can be processed at high temperatures for techniques like extrusion, hot rolling, and hot pressing. The electrolyte contains a low volatility lithium salt like bis(fluorosulfonyl)lithium imide, additives, and a solvent blend of ethylene carbonate and propylene carbonate. The composition allows battery component manufacturing at elevated temperatures without decomposition or evaporation issues.

Source

Non-aqueous electrolyte composition and lithium secondary battery with improved cycle life, capacity retention, and safety at high temperatures by preventing metal ion elution and electrolyte decomposition. The electrolyte contains a lithium salt and a compound with a nitrogen-containing six-membered ring where hydrogen is substituted with a group like methyl or ethyl (N3Hx, x=0-3). This compound forms a film on electrode surfaces to prevent direct contact with the electrolyte, reducing HF generation, oxidative decomposition, and metal ion precipitation. The battery also has improved storage stability at high temperatures.

Source

Electrolyte composition for lithium-ion batteries that enables high voltage operation, improved cycling and storage at elevated temperatures. The electrolyte contains a specific additive composition, typically 0.01-20% by weight, along with a lithium salt. The additive helps prevent oxidation of the electrolyte at high voltages. The composition improves battery performance and lifespan at voltages above 4.4V, which is needed for higher energy density lithium-ion batteries.

Source

Fast-charging electrolyte for lithium-ion batteries that improves high/low temperature charge/discharge performance and fast charging speed. The electrolyte contains specific solvents, lithium salts, and additives in a balanced ratio. The additives include vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, lithium difluorophosphate, and lithium difluoroxalate borate. The electrolyte also contains trimethylsilyl isocyanate and tetrabutylammonium perchlorate. This composition balances electrode/electrolyte interface properties for better cycle life, temperature performance, and fast charging.

Source

Electrolyte composition for lithium-ion batteries that enables high voltage operation beyond 4.5V. The electrolyte contains specific amounts of lithium bis(trifluoromethanesulfonyl)imide salt, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether solvent, sulfolane cyclic sulfone, and 0-15% fluoroethylene carbonate. The composition allows stable high voltage operation in lithium-ion batteries above 4.5V, while also having improved safety compared to conventional electrolytes.

Source

Lithium-ion battery electrolyte that reduces internal resistance, especially during fast charging, and improves safety by stabilizing the positive electrode and suppressing gas generation. The electrolyte contains difluorophosphate compounds and cyclic ester additives like vinylene carbonate, 1,3-propane sultone, and vinyl sulfate. The difluorophosphate compounds coordinate with positive electrode transition metals to stabilize them, while the cyclic esters improve film formation on the electrodes during charging.

Source

Electrolyte for lithium-ion batteries that improves safety, energy density, cycle life, and dendrite growth inhibition. The electrolyte contains a fluorinated solvent, fluorinated sulfonimide lithium salt, and lithium halide additive. The fluorinated solvent provides flame retardancy and improved conductivity. The fluorinated sulfonimide salt improves stability at high voltages. The lithium halide additive further enhances stability and inhibits dendrite growth. The electrolyte composition balances properties like conductivity, flammability, stability, and dendrite growth inhibition for better overall battery performance.

Source

Electrolyte composition for lithium-ion batteries that improves battery performance, especially high-rate charging, high-temperature cycling, and longevity, by forming a durable SEI coating on the negative electrode. The electrolyte contains a lithium salt, a non-aqueous organic solvent, and an additive with a specific compound. The compound is represented by formula 1: -CH2-C(=O)-O-C(=O)-CH2- (1) This compound adds to the electrolyte to reduce gas generation at high temperatures, prevent decomposition of the electrolyte, and form a uniform SEI coating on the negative electrode.

Source

Electrolyte composition for lithium-ion batteries that improves cycle life and storage performance. The electrolyte contains fluorine-containing lithium salts like LiPF6, LiN(SO2F)2, LiPO2F2, and LiODFP in specific ratios. The fluorine-containing lithium salts cooperate to optimize electrolyte performance and battery cycle life. The exact ratios are: LiPF6:LiN(SO2F)2:LiPO2F2:LiODFP = 12.8:1.97:0.74:0.49 or LiPF6:LiN(SO2F)2:LiPO2F2:LiODFB = 6:2.03:0.81:0.61. The electrolyte also contains vinylene

Source

Lithium-ion battery electrolyte composition that improves low-temperature performance by adding asymmetric fluoroalkane compounds as solvents. The compounds have C3-C4 chains with end hydrogen atoms to provide solubility and low viscosity at room temperature while avoiding high-temperature bloating issues. The asymmetric fluoroalkanes improve battery capacity retention at -60°C compared to conventional electrolytes. They also enhance low-temperature interface dynamics and electrochemical stability without compromising high-temperature cycling.

Source

Fluorinated solvent-based electrolyte for high-voltage lithium-ion batteries that improves performance at high voltages. The electrolyte contains a lithium salt like LiPF6 in a solvent mixture of carbonates and fluorocarbonates like EC, DMC, FEC, and FEMC. This electrolyte allows stable operation of lithium batteries at voltages above 4.3V, preventing decomposition and corrosion issues that limit high-voltage performance. The fluorinated solvent components improve stability and cycling life at high voltages compared to non-fluorinated carbonate electrolytes.

Source