Lithium secondary battery comprising spherical graphite as anode active material
AssigneeLG Chem, Ltd.
InventorsByoung Hoon Ahn, Chang-Wan Koo, Joon Sung Bae, Jae Bin Chung
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Abstract
Disclosed is an anode active material for lithium secondary batteries that includes natural graphite particles consisting of spherical particles of agglomerated graphite sheets, outer surfaces of which are not coated with a carbon-based material, wherein the surfaces of the particles have a degree of amorphization of at least 0.3 within a range within which an R value [R=I1350/I1580] (I1350 is the intensity of Raman around 1350 cm−1 and I1580 is the intensity of Raman around 1580 cm−1) of a Raman spectrum is in the range of 0.30 to 1.0.
Claims12
An anode mixture for secondary batteries, comprising:
- an anode active material for lithium secondary batteries;
- an aqueous binder;
- and
- an aqueous thickening agent,
- wherein the aqueous thickening agent is carboxy methyl cellulose (CMC), and the aqueous binder is styrene-butadiene rubber (SBR),
- wherein the anode active material comprises natural graphite particles comprising spherical particles of agglomerated graphite sheets, outer surfaces of which are not coated with a carbon-based material, and
- wherein the surfaces of the particles have a degree of amorphization ranging from 0.3 to 0.5 to control viscosity and stability of the mixture and have an R value of a Raman spectrum ranging from 0.3 to 1.0, wherein the R value is represented by the following formula:
- R=I1350/I1580
- wherein I1350 is a Raman intensity of about 1350 cm−1 and I1580 is a Raman intensity of about 1580 cm−1.
Dependencies are inferred from the claim text.