Anode material for secondary battery, secondary batteries using the same, method for manufacturing anode material for secondary battery and secondary batteries using the same
Disclosed are an anode material for a secondary battery, a secondary battery using the same, a manufacturing method of the anode material for a secondary battery and a secondary battery using the same. The present invention provides an anode material for a secondary battery including an anode active material; and a coating material with which a surface of the anode active material is coated using a mixture of a conductive material and a pitch which is a low-crystallinity carbonaceous material, wherein the conductive material in the coating material is included in a content of 0.2% by weight or more of the anode active material and the low-crystallinity carbonaceous material. According to the present invention, the secondary battery having an excellent electrical property may be provided by preventing a charging/discharging efficiency and a charging/discharging capacity of the battery from being deteriorated, and simultaneously improving conductivity of the electrode.
1 . An anode material for a secondary battery comprising:
an anode active material; and
a conductive material with which a surface of the anode active material is coated,
wherein the conductive material is included in a content of 0.2% by weight or more, based on the total weight of the anode active material.
2 . The anode material for a secondary battery according to claim 1 ,
wherein the anode material for a secondary battery has an electrode resistance of 2.0Ω or less.
3 . The anode material for a secondary battery according to claim 1 , wherein the anode active material is natural graphite.
4 . The anode material for a secondary battery according to claim 1 ,
wherein the conductive material is at least one material selected from the group consisting of carbon black, Super-P and carbon nanotube.
5 . An anode material for a secondary battery comprising:
an anode active material; and
a coating material with which a surface of the anode active material is coated using a mixture of a conductive material and a pitch which is a low-crystallinity carbonaceous material,
wherein the conductive material in the coating material is included in a content of 0.2% by weight or more, based on the total weight of the anode active material and the low-crystallinity carbonaceous material.
6 . The anode material for a secondary battery according to claim 5 ,
wherein the anode material for a secondary battery has an electrode resistance of 2.0Ω or less.
7 . The anode material for a secondary battery according to claim 5 ,
wherein the anode active material is natural graphite.
8 . The anode material for a secondary battery according to claim 5 ,
wherein the conductive material is at least one material selected from the group consisting of carbon black, Super-P and carbon nanotube.
9 . A secondary battery manufactured by using, as a battery anode, the anode material for a secondary battery as defined in claim 1 .
10 . The secondary battery according to claim 9 ,
wherein the secondary battery has a discharging capacity of 330 mAh/g or more and a charging/discharging efficiency of 90% or more.
11 . A secondary battery manufactured by using, as a battery anode, the anode material for a secondary battery as defined in claim 5 .
12 . The secondary battery according to claim 11 ,
wherein the secondary battery has a discharging capacity of 330 mAh/g or more and a charging/discharging efficiency of 90% or more.
13 . A method for manufacturing an anode material for a secondary battery, comprising:
(S1) preparing natural graphite which is a crystalline carbonaceous material, a pitch which is a low-crystallinity carbonaceous material, and a conductive material;
(S2) mixing the prepared materials together to coat a crystalline carbonaceous material with the low-crystallinity carbonaceous material and the conductive material at the same time and drying the coated crystalline carbonaceous material; and
(S3) calcining the dried product.
14 . The method for manufacturing an anode material for a secondary battery according to claim 13 ,
wherein the crystalline carbonaceous material of the step (S1) is natural graphite.
15 . The method for manufacturing an anode material for a secondary battery according to claim 13 ,
wherein the conductive material of the step (S1) is at least one material selected from the group consisting of carbon black, Super-P and carbon nanotube.
16 . The method for manufacturing an anode material for a secondary battery according to claim 13 ,
wherein the calcination of the step (S3) is carried out at different temperatures in at least two steps.
17 . The method for manufacturing an anode material for a secondary battery according to claim 16 ,
wherein the calcination process carried out in at least two steps is carried out at a relatively lower temperature in an initial calcination step and at a relatively higher temperature in a later calcination step.
18 . A secondary battery manufactured by using, as a battery anode, the anode material manufactured according to the method as defined in any of claims 13 .
19 . The secondary battery according to claim 18 ,
wherein the secondary battery has a discharging capacity of 330 mAh/g or more and a charging/discharging efficiency of 90% or more.