Samsung Sdi Co., Inc.

Eunjoo Lee

Jaewon Kim

Jaehou Nah

Hyun Soh

Yongseok Kim

Joongho Moon

Sunil Park

Narae Kim

Kyeu Yoon Sheem

A negative active material for a rechargeable lithium battery includes a secondary particle in which a plurality of natural graphite primary particles are agglomerated, the plurality of primary particles including natural graphite, and the secondary particle including pores, and an amorphous carbon positioned in the pores, wherein an area of the amorphous carbon is about 10% to about 30% based on a total area of 100% of the negative active material, in a cross-section of the negative active material.

Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

A rechargeable lithium battery includes a negative active material including: a secondary particle including a core in which a plurality of primary particles are agglomerated, the primary particles including a natural graphite; and a coating layer including amorphous carbon and surrounding the core, wherein a Raman peak intensity ratio of a D peak (1350 cmto 1370 cm) to a D' peak (1570 cmto 1620 cm) (I/I) of the negative active material is about 3.2 to about 3.8, and a lattice constant La of the negative active material is about 30 nm to about 45 nm.

A negative active material for a rechargeable lithium battery includes natural graphite including secondary particles in which a plurality of primary particles are assembled; amorphous carbon on the surface of the primary particles; and a coating layer including amorphous carbon surrounding the secondary particles, wherein the primary particles have an average particle diameter of about 5 &#x3bc;m to about 15 &#x3bc;m, the secondary particles have an average particle diameter of about 8 &#x3bc;m to about 24 &#x3bc;m, and a peak intensity ratio I(002)/I(110) is less than or equal to about 120 as measured by X-ray diffraction.

Negative active material for rechargeable lithium battery, method for preparing same, negative electrode including the same and rechargeable lithium battery including same

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Yongin-si, South Korea

Eunjoo Lee