Electrolyte for lithium ion rechargeable battery and lithium ion rechargeable battery including the same
First Claim
1. An electrolyte for a lithium rechargeable battery, comprising:
- a lithium salt;
a non-aqueous organic solvent;
a first additive having a Lowest Unoccupied Molecular Orbital (LUMO) level between 0.3 eV and 0.5 eV when calculated by the AM1 (Austin Model
1) method; and
a second additive having a LUMO level between −
0.2 eV and 0.3 eV or between 0.5 eV and 1.0 eV when calculated by the AM1 method.
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Abstract
The present invention is an electrolyte for a lithium ion rechargeable battery and a lithium ion rechargeable battery that includes the same. More particularly, the present invention discloses an electrolyte for a lithium ion rechargeable battery that provides excellent cycle life characteristics and high-temperatures storage stability and prevents a drop in discharge capacity of a battery at low temperature, and a lithium ion rechargeable battery including the same. The lithium ion rechargeable battery including the electrolyte provides improved cycle life characteristics and prevents the problems of a drop in discharge capacity at low temperature and high-temperature swelling through the formation of a stable SEI film at the initial charge cycle.
95 Citations
24 Claims
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1. An electrolyte for a lithium rechargeable battery, comprising:
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a lithium salt;
a non-aqueous organic solvent;
a first additive having a Lowest Unoccupied Molecular Orbital (LUMO) level between 0.3 eV and 0.5 eV when calculated by the AM1 (Austin Model
1) method; and
a second additive having a LUMO level between −
0.2 eV and 0.3 eV or between 0.5 eV and 1.0 eV when calculated by the AM1 method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24)
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18. An electrolyte for a lithium rechargeable battery, comprising:
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a lithium salt;
a non-aqueous organic solvent;
a first additive having a Lowest Unoccupied Molecular Orbital (LUMO) level between 0.3 eV and 0.5 eV, when calculated by the AM1 (Austin Model
1) method;
a second additive having an LUMO level between 0.5 eV and 1.0 eV, when calculated by the AM1 method; and
a third additive having an LUMO level between −
0.2 eV and 0.3 eV, when calculated by the AM1 method.
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Specification