Anode material for secondary battery and secondary batteries using the same
Disclosed are an anode material for a secondary battery and a secondary battery using the same. The present invention provides the anode material for a secondary battery, produced by coating a high-crystallinity core carbonaceous material with a coating carbonaceous material and calcining the high-crystallinity core carbonaceous material, wherein the anode material for a secondary battery has a delamination area of 0.1×10 −5 to 1.0×10 −4 or a volume fraction of water uptake of 0.01 or less. The secondary battery according to the present invention may be useful to improve a charging/discharging capacity and a charging/discharging efficiency of the battery and ensure a stability of the battery since the battery has an improved protection against a degradation reaction of an electrolyte if the battery is produced using the anode material for a secondary battery.
1 . An anode material for a secondary battery, produced by coating a high-crystallinity core carbonaceous material with a coating carbonaceous material and calcining the high-crystallinity core carbonaceous material, wherein the anode material for a secondary battery has a delamination area of 0.1×10 −5 to 1.0×10 −4 .
2 . The anode material for a secondary battery according to claim 1 ,
wherein the coating carbonaceous material has a relatively lower Raman intensity ratio than the core carbonaceous material.
3 . The anode material for a secondary battery according to claim 1 ,
wherein the anode material for a secondary battery has a ratio (I 1360 /I 1580 ) of 0.01 to 0.45, the ratio (I 1360 /I 1580 ) being a ratio of a peak intensity (I 1360 ) at 1,360 cm −1 to a peak intensity (I 1580 ) at 1,580 cm −1 observed by a Raman spectroscopy analysis using an argon (Ar) laser having a wavelength of 514.5 nm.
4 . The anode material for a secondary battery according to claim 1 ,
wherein the anode material for a secondary battery has a tap density of 0.7 g/cm 3 or more.
5 . The anode material for a secondary battery according to claim 1 ,
wherein the anode material for a secondary battery has a BET specific surface area of 4 m 2 /g or less.
6 . The anode material for a secondary battery according to claim 1 ,
wherein the high-crystallinity core carbonaceous material is natural graphite.
7 . A secondary battery produced using, as a battery anode, the anode material for a secondary battery as defined in any of claims 1 to 6 .
8 . The secondary battery according to claim 7 ,
wherein the secondary battery has a discharging capacity of 340 mAh/g or more and a charging/discharging efficiency of 90% or more.
9 . An anode material for a secondary battery, produced by coating a high-crystallinity core carbonaceous material with a coating carbonaceous material and calcining the high-crystallinity core carbonaceous material,
wherein the anode material for a secondary battery has a volume fraction of water uptake of 0.01 or less.
10 . The anode material for a secondary battery according to claim 9 ,
wherein the coating carbonaceous material has a relatively lower Raman intensity ratio than the core carbonaceous material.
11 . The anode material for a secondary battery according to claim 9 ,
wherein the anode material for a secondary battery has a ratio (I 1360 /I 1580 ) of 0.01 to 0.45, the ratio (I 1360 /I 1580 ) being a ratio of a peak intensity (I 1360 ) at 1,360 cm −1 to a peak intensity (I 1580 ) at 1,580 cm −1 observed by a Raman spectroscopy analysis using an argon (Ar) laser having a wavelength of 514.5 nm.
12 . The anode material for a secondary battery according to claim 9 ,
wherein the anode material for a secondary battery has a tap density of 0.7 g/cm 3 or more.
13 . The anode material for a secondary battery according to claim 9 ,
wherein the anode material for a secondary battery has a BET specific surface area of 4 m 2 /g or less.
14 . The anode material for a secondary battery according to claim 9 ,
wherein the high-crystallinity core carbonaceous material is natural graphite.
15 . A secondary battery produced using, as a battery anode, the anode material for a secondary battery as defined in any of claims 9 to 14 .
16 . The secondary battery according to claim 15 ,
wherein the secondary battery has a discharging capacity of 340 mAh/g or more and a charging/discharging efficiency of 90% or more.