Anode material for secondary battery, secondary batteries using the same, method for manufacturing anode material for secondary battery and secondary batteries using the same

Abstract

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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects and aspects of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings. However, it should be understood that the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the invention. In the drawings:

FIG. 1 is a flow chart illustrating a process for manufacturing an electrode using an anode material for a secondary battery according to the present invention.

Claims

1. An anode material for a secondary battery comprising: an anode active material; anda 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; anda 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.