Cathode active material and lithium secondary battery containing them
AssigneeLG Chem, Ltd.
InventorsJi Ryu, Min Kim, Jung Hyun, Jaepil Lee, Eun Lee, Youngjoon Shin
Life of this patent
Estimating the term…
Abstract
Provided is a non-aqueous electrolyte-based, high-power lithium secondary battery having a long service life and superior safety at both room temperature and high temperature, even after repeated high-current charging and discharging. The battery comprises a mixture of a lithium/manganese spinel oxide having a substitution of a manganese (Mn) site with a certain metal ion and a lithium/nickel/cobalt/manganese composite oxide, as a cathode active material.
Claims14
A cathode active material for a lithium secondary battery, comprising a mixture of a lithium/manganese spinel oxide represented by Formula I and a lithium/nickel/cobalt/manganese oxide represented by Formula II:
- Li1+xMn2−yMyO4 (I)
- Li1+zNibMncCo1−(b+c)O2 (II)
- wherein,
- M is a metal having an oxidation number of 2 to 3;
- 0≦x≦0.2;
- 0<y≦0.2;
- 0≦z≦0.1;
- 0.2≦b≦0.7;
- 0.2≦c≦0.7;
- and
- b+c<1.
Dependencies are inferred from the claim text.