Lg Energy Solution, Ltd.

Lg Chem, Ltd

Rae-Hwan Jo

Yong-Ju Lee

Je-Young Kim

Sun-Young Shin

Eun-Kyung Kim

Su-Min Lee

Il-Geun Oh

Dong-Hyuk Kim

Jung-Hyun Choi

Disclosed is a negative electrode active material which includes: a silicon oxide composite including i) Si, ii) a silicon oxide represented by SiO(0&#x3c;x&#x2264;2), and iii) magnesium silicate containing Si and Mg; and a carbon coating layer positioned on the surface of the silicon oxide composite and including a carbonaceous material, wherein X-ray diffractometry of the negative electrode active material shows peaks of MgSiOand MgSiOat the same time and shows no peak of MgO; the ratio of peak intensity, I (MgSiO)/I (MgSiO), which is intensity I (MgSiO) of peaks that belong to MgSiOto intensity I (MgSiO) of peaks that belong to MgSiOis smaller than 1, the peaks that belong to MgSiOare observed at 2&#x3b8;=32.2&#xb1;0.2&#xb0;, and the peaks that belong to MgSiOare observed at 2&#x3b8;=30.9&#xb1;0.2&#xb0;.

Negative electrode active material, negative electrode including the same and lithium secondary battery including the same

Disclosed is a negative electrode active material which includes: secondary particles having a plurality of primary particles which include a silicon oxide composite including i) Si, ii) a silicon oxide represented by SiO(0&#x3c;x&#x2264;2), and iii) a metal silicate containing Si and M, wherein M is at least one of Li and Mg; and a first carbon coating layer disposed partially or totally on the surfaces of the primary particles to interconnect and fix the primary particles; and a second carbon coating layer disposed on the surfaces of the secondary particles, wherein the second carbon coating layer has higher crystallinity as compared to the first carbon coating layer, and the primary particles have an average particle diameter (D) of 0.1-3.5 &#x3bc;m. A negative electrode including the negative electrode active material, and a lithium secondary battery including the negative electrode are also disclosed.

Disclosed is a negative electrode for a lithium secondary battery which includes: a negative electrode current collector; a first negative electrode mixture layer positioned on at least one surface of the negative electrode current collector and including a first negative electrode active material, a polymer binder and a conductive material; and a second negative electrode mixture layer positioned on the top surface of the first negative electrode mixture layer and including a second negative electrode active material, a polymer binder and a conductive material, wherein the second negative electrode active material has a smaller water contact angle as compared to the first negative electrode active material, and at least one of the first negative electrode active material and the second negative electrode active material is surface-modified.

Negative electrode for lithium secondary battery and lithium secondary battery including the same

A negative electrode for a lithium secondary battery (and a lithium secondary battery including the same) including: a negative electrode current collector; a first negative electrode mixture layer present on at least one surface of the negative electrode current collector and including a first carbonaceous negative electrode active material, a first polymer binder and a first conductive material; a second negative electrode mixture layer present on a top surface of the first negative electrode mixture layer and including a silicon-based negative electrode active material, a second polymer binder and a second conductive material; and a third negative electrode mixture layer present on a top surface of the second negative electrode mixture layer and including a second carbonaceous negative electrode active material, a third polymer binder and a third conductive material.

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Daejeon, South Korea

Rae-Hwan Jo