Lithium secondary battery with improved cell characteristics
AssigneeLG Chem, Ltd.
InventorsSoojin Kim, Hong-Kyu Park, Sung kyun Chang, Jeong-Ju Cho, Hochun Lee
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Abstract
Disclosed herein is a lithium secondary cell including 20 to 100 wt. % of lithium transition metal oxide represented by a formula of Li1+zNibMncMe1−(b+c)O2, relative to a total amount of a cathode active material, as well as an electrolyte consisting of a lithium salt and a non-aqueous solvent, wherein a first additive to form a protective film (that is, a solid electrolyte interface film: SEI film) over a surface of an anode active material and a second additive to form another SEI film over the surface of the anode active material while inactivating impurities contained in the cathode active material are included in the electrolyte.
Claims15
A lithium secondary cell, comprising:
- 20 to 100 wt. % of lithium transition metal oxide represented by the following formula 1, relative to a total amount of a cathode active material,
- Li1+zNibMncMe1+(b+c)O2 (1)
- wherein −0.5<z<0.5, 0.3<b<0.9, 0.1<c<0.8, b+c<1, Me is at least one element selected from a group consisting of Co, Al, Mg, Ti, Sr, Zn, B, Ca, Si, Ga, Sn, P, V, Sb, Nb, Ta, Mo, W, Zr, Y and Fe;
- and
- an electrolyte consisting of a lithium salt and a non-aqueous solvent, wherein a first additive to form a protective film (that is, a solid electrolyte interface film:
- SEI film) over a surface of an anode active material and a second additive to form another protective film over the surface of the anode active material while inactivating impurities contained in the cathode active material are included in the electrolyte,
- wherein the second additive is a material having both at least one Si—O—Si bond and at least two carbon-carbon double bonds by reaction of impurities with water.
Dependencies are inferred from the claim text.