Lg Chem, Ltd

Chang Joo Han

Su-min Park

JiEun Lee

KyungHee Han

Ji Eun Lee

Kyung Hee Han

Hyeon Hui Baek

Dong Kyu Yun

Ki Joo Hong

Kyunghee Han

Jieun Lee

The present disclosure provides a cathode active material comprising: lithium transition metal oxide-based particles; and a titanium dioxide coating layer formed on a part or a whole of a surface of the particle, in which the titanium dioxide coating layer is a partially reduced TiO(0&#x3c;x&#x3c;2), a preparation method thereof, and a lithium secondary battery including the cathode active material. The cathode active material of the present disclosure may significantly improve electrochemical properties of an electrochemical device including the cathode active material, preferably a lithium secondary battery by decomposing lithium-containing impurities remaining on the surface of the cathode active material by a partially reduced titanium dioxide coating layer formed on the surface of the cathode active material and enhancing the electrical conductivity of the cathode active material.

Cathode active material having excellent electrochemical properties and lithium secondary battery comprising the same

Disclosed is a high energy density lithium secondary battery including a cathode. The cathode contains, as cathode active materials, a first cathode active material having a layered structure and a second cathode active material having a spinel structure. 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 high density lithium secondary battery further comprises an anode, including crystalline graphite having a specific surface area (with respect to capacity) of 0.005 to 0.013 m/mAh as an anode active material, as well as a separator.

Lithium secondary battery of high energy density with improved energy property

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.

Disclosed is a high-energy lithium secondary battery including: a cathode including, as cathode active materials, a first cathode active material represented by Formula 1 below and having a layered structure and a second cathode active material represented by Formula 2 below and having a spinel structure, wherein the amount of the first cathode active material is between 40 and 100 wt % based on a total weight of the cathode active materials; an anode including amorphous carbon having a capacity of 300 mAh/g or more; and a separator.

Lithium secondary battery of high energy with improved energy property

A high-output lithium secondary battery is provided. In some embodiments, the lithium secondary battery includes a cathode having a first cathode active material having a layered structure and. a second cathode active material having a spinel structure, wherein the-amount of the second cathode active material is between 40 and 100 wt % based on the total weight of the cathode active materials, an anode including crystalline graphite having a specific surface area (with respect to capacity) of 0.005 to 0.013 m/mAh as an anode active material, and a separator.

Lithium secondary battery of high power property with improved high energy density

Disclosed is a high-output lithium secondary battery including: a cathode that includes, as cathode active materials, a first cathode active material represented by Formula 1 below and having a layered structure and a second cathode active material represented by Formula 2 below and having a spinel structure, wherein the amount of the second cathode active material is between 40 and 100 wt % based on the total weight of the cathode active materials; an anode including crystalline graphite and amorphous carbon as anode active materials, wherein the amount of the amorphous carbon is between 40 and 100 wt % based on the total weight of the anode active materials; and a separator.

Lithium secondary battery of high power property with improved high power density

Disclosed is a high-output lithium secondary battery including: a cathode that includes, as cathode active materials, a first cathode active material represented by Formula 1 below and having a layered structure and a second cathode active material represented by Formula 2 below and having a spinel structure, wherein the amount of the second cathode active material is between 40 and 100 wt % based on the total weight of the cathode active materials; an anode including amorphous carbon having a capacity of 300 mAh/g or greater; and a separator.

Disclosed is a high-output lithium secondary battery including: a cathode including a cathode active material having an average particle diameter (with respect to capacity) of 0.03 to 0.1 &#x3bc;m/mAh and a layered structure; an anode including crystalline graphite and amorphous carbon as anode active materials, wherein the amount of the amorphous carbon is between 40 and 100 wt % based on the total weight of the anode active materials; and a separator.

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Daejeon, South Korea

Chang Joo Han