Non-aqueous electrolyte solution for secondary battery and non-aqueous electrolyte secondary battery
OwnerTakanobu Chiga, Yoshinori Kidainventors
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Abstract
In a non-aqueous electrolyte secondary battery having a positive electrode, a negative electrode, and a non-aqueous electrolyte solution containing a fluorinated ester as a solvent, battery safety is improved without degrading charge-discharge characteristics. A non-aqueous electrolyte solution for a secondary battery contains a fluorinated ester represented by the chemical formula CHF2COOR, where R is an alkyl group having 1 to 4 carbon atoms or a halogen-atom-substituted alkyl group having 1 to 4 carbon atoms. The fluorinated ester has a water content of 30 ppm or less. The solvent additionally contains a cyclic carbonic ester having an unsaturated C═C bond.
Claims20
A non-aqueous electrolyte solution for a secondary battery, comprising:
- a lithium salt as an electrolyte;
- and
- a solvent containing a cyclic carbonic ester having an unsaturated C═C bond, and a fluorinated ester having a water content of 30 ppm or less and represented by the chemical formula CHF2COOR, where R is an alkyl group having 1 to 4 carbon atoms or a halogen-atom-substituted alkyl group having 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.