Provided are a negative active material, a method of preparing the same, and a lithium battery including the negative active material. The negative active material includes a carbonaceous core that has a sulfur content of about 10 ppm to 900 ppm; and an amorphous carbon layer continuously formed on a surface of the carbonaceous core, wherein the carbonaceous core has a crystalloid plate structure, and a crystallite size measured from a full width at half maximum of the peak with respect to the surface (002) of about 10 nm to about 45 nm in an X-ray diffraction spectrum of the carbonaceous core. The lithium battery including a negative electrode including the negative active material has improved capacity characteristics and ring lifetime characteristics.

Claims

13 · 2 independent · depth 3

13 granted claims

›1.independentA negative active material comprising:na carbonaceous core comprising a sulfur content of from about 10 ppm to 900 ppm; andan amorphous carbon layer c…+11

›2.↳ 1The negative active material of claim 1, wherein the carbonaceous core has a peak with respect to a surface (002) at a Bragg angle 2θ of 26.4°±0.1° in…d2

›3.↳ 1The negative active material of claim 1, wherein the carbonaceous core has a full width at half maximum of the peak with respect to the surface (002) …d2

›4.↳ 1The negative active material of claim 1, wherein the carbonaceous core has an interlayer spacing (d002) of the surface (002) measured by X-ray diffrac…d2

›5.↳ 1The negative active material of claim 1, wherein the amorphous carbon layer is a pitch coating.d2

›6.↳ 1The negative active material of claim 1, wherein the negative active material is spherical or oval, and a longer direction particle size thereof d50 i…d2

›7.↳ 1The negative active material of claim 1, wherein the negative active material has voids therein.d2

›8.↳ 1The negative active material of claim 1, wherein a BET specific surface area of the negative active material is from about 1 m2/g to about 30 m2/g.d2

›9.↳ 1The negative active material of claim 1, wherein a tap density of the negative active material is from about 0.2 g/cc to 2.0 g/cc.d2

›10.↳ 1The negative active material of claim 1, wherein the negative active material additionally comprises metal nanoparticles.d2+2

›13.independentA lithium battery comprising:na positive electrode comprising a positive active material;a negative electrode comprising a negative active material co…

Classifications

13 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B82Y30/00
B05D3/02

Section C — Chemistry; metallurgy

C01B31/02

Section H — Electricity

H01M4/583
H01M10/0525
H01M4/04
H01M4/587
H01M4/38
H01M4/36

USPC · US Patent Classification

429/223429/231.8427/113977/773

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3.0 y

1,111 days filing → grant

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after a restriction

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Karie O'Neill Apicella

art unit 1726 · TC 1700

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20120288766 A1	15 Nov 2012

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