Lithium secondary battery of high energy density with improved energy property

摘要

High energy density lithium secondary batteries are disclosed herein. In some embodiments, a high energy density lithium secondary battery includes a cathode, an anode, and a separator. The cathode includes a first cathode active material having a layered structure and a second cathode active material having a spinel structure, wherein the amount of the first cathode active material is between 40 and 100 wt % based on the total weight of the cathode active materials. The anode includes crystalline graphite and amorphous carbon as anode active materials, wherein the amount of the crystalline graphite is between 40 and 100 wt % based on the total weight of the anode active materials.

主权项

1. A high energy density lithium secondary battery comprising:
a cathode comprising: a first cathode active material represented by Formula 1 below and having a layered structure, wherein the first cathode active material has an average particle diameter with respect to capacity of 0.03 to 0.1 μm/mAh, and a powder conductivity of 1×10 −3 S/cm or greater to less than 10×10−3 S/cm at a powder density of 2.65 to 2.85 g/cc; and a second cathode active material represented by Formula 2 below and having a spinel structure, wherein the second cathode active material has an average particle diameter with respect to capacity of 0.1 to 0.2 μm/mAh, and a powder conductivity of 1×10 −5 S/cm or greater to less than 10×10−5 S/cm at a powder density of 2.65 to 2.85 g/cc, wherein an amount of the first cathode active material is between 50 and 90 wt % based on a total weight of the first and second cathode active materials; an anode comprising: crystalline graphite and amorphous carbon as anode active materials, wherein an amount of the crystalline graphite is between 40 and 100 wt % based on a total weight of the anode active materials; and a separator,
Lix (NivMnwCoyMz) 02−tAt   (1) wherein 0.8LiaMn2−bM ′bO4−cA ′c  (2) wherein 0.8