Application of Nonflammable Electrolytes to High Performance Lithium-ion Cells

The use of nonflammable electrolytes containing a solvent that includes alkyl fluoride groups to improve the safety of lithium-ion cells has been investigated. The positive electrodes of the cells comprise a mixture of a multi-component transition metal oxide and a polyanionic compound. The nonflammability of the electrolyte is shown by adding 30 vol% of a phosphate solution to the base electrolyte. It is observed that the cycle-life performances of the cells with the nonflammable electrolyte at 45°C are higher than that of the cell containing the base electrolyte.