Samsung Sdi Co., Inc.

Soojeong Lee

Young-Kee Kim

Sun-Il Park

Changsu Shin

Sujin Um

Dong-Hyun Shin

Joon-Kil Son

Provided is an anode active material, including: an amorphous carbon material in which the ratio of moieties having a distance dof 3.77 &#x212b; or more between crystal planes is 4% to 15% based on the entire crystal plane distance distribution. When the anode active material is used, the lifespan characteristics of a lithium battery may be improved while exhibiting high capacity.

Anode active material and preparation method therefor

Disclosed is that an anode active material for a lithium secondary battery, and a lithium secondary battery comprising the same. The anode active material for a lithium secondary battery comprises a composite of a Si-based or Sn-based material and a carbon-based material, a Raman spectrum peak intensity ratio (I/I) of a peak intensity (I) of a D peak (1360 cmto 1370 cm) relative to a peak intensity (I) of a D' peak (1620 cmto 1625 cm) of the carbon-based material is 4.5 to 10, a peak intensity ratio (I/I) of a peak intensity (I) of a G peak (1580 cmto 1590 cm) relative to a peak intensity (I) of a D peak (1360 cmto 1370 cm) of the carbon-based material is 0.6 to 1.5, and an average diameter (D50) of the Si-based or Sn-based metallic material is 30 nm to 80 nm.

Anode active material for lithium secondary battery, and lithium secondary battery comprising same

A negative active material for a rechargeable lithium battery includes a lithium titanate compound represented by Chemical Formula 1, where R, a Raman spectrum intensity ratio (I(F2u)/I(F2g)) of an F2u peak in a range of about 200 cmto about 300 cmrelative to an F2g peak in a range of about 400 cmto about 550 cmis greater than or equal to about 0.7.LiTiMO&#x2003;&#x2003;Chemical Formula 1 In Chemical Formula 1, &#x2212;0.2&#x2264;x&#x2264;0.2, &#x2212;0.3&#x2264;y&#x2264;0.3, 0&#x2264;z&#x2264;0.3, &#x2212;0.3&#x2264;n&#x2264;0.3, and M is selected from Mg, Al, Ca, Sr, Cr, V, Fe, Co, Ni, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, Ba, La, Ce, Ag, Ta, Hf, Ru, Bi, Sb, As, and a combination thereof.

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

A negative electrode for a rechargeable lithium battery includes a negative active material including a titanium-containing oxide and amorphous carbon. The titanium-containing oxide is present in a larger amount than the amorphous carbon.

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Yongin-si, South Korea

Soojeong Lee