Nonaqueous electrolyte for secondary battery and secondary battery including the same
View Patent ↗A non-aqueous electrolyte for a secondary battery, including a non-aqueous solvent in which a solute is dissolved, a first additive and a second additive, wherein the first additive is a vinyl monomer having an electron donating group, the second additive is a carbonic acid ester having at least one carbon-carbon unsaturated bond, and an e value, which is a polarization factor of the vinyl monomer having an electron donating group, is a negative value.
1. A non-aqueous electrolyte for a secondary battery, comprising:
a non-aqueous solvent in which a solute is dissolved;
a first additive; and
a second additive,
wherein said first additive is a vinyl monomer represented by the formula (I):
wherein R 1 represents an alkyl group having 2 to 11 carbon atoms, a halogenated alkyl group having 2 to 11 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or aryl group, and having an electron donating group,
said second additive is a carbonic acid ester having at least one carbon-carbon unsaturated bond, and
an e value, which is a polarization factor of said vinyl monomer, is a negative value.
2. The non-aqueous electrolyte in accordance with claim 1 ,
wherein said solute includes lithium tetrafluoroborate (LiBF 4 ).
3. The non-aqueous electrolyte in accordance with claim 1 , wherein said vinyl monomer includes vinyl propionate.
4. The non-aqueous electrolyte in accordance with claim 1 , wherein said second additive includes at least one selected from the group consisting of vinylene carbonate, vinyl ethylene carbonate and diallyl carbonate.
5. A secondary battery comprising:
a positive electrode capable of absorbing and desorbing lithium;
a negative electrode capable of absorbing and desorbing lithium;
a separator interposed between said positive electrode and said negative electrode; and
the non-aqueous electrolyte according to claim 1 .